项目如何搭建？

考虑使用不使用Maven？依赖，jar

项目搭建

搭建Maven的Web项目
配置tomcat
测试项目能否跑起来
导依赖jar包

  <dependencies><dependency><groupId>javax.servlet</groupId><artifactId>servlet-api</artifactId><version>2.5</version></dependency><dependency><groupId>javax.servlet.jsp</groupId><artifactId>javax.servlet.jsp-api</artifactId><version>2.3.3</version></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>8.0.22</version></dependency><dependency><groupId>javax.servlet.jsp.jstl</groupId><artifactId>jstl-api</artifactId><version>1.2</version></dependency><dependency><groupId>taglibs</groupId><artifactId>standard</artifactId><version>1.1.2</version></dependency></dependencies>

创建项目包结构
main

- java
- - com.kwok- dao 持久化层
- - filter 过滤层
- - pojo 实体层
- - service 业务层
- - servlet 调用业务层
- resources
- db.properties 数据库配置文件
- webapp

编写实体类
- ORM映射：表 - 类

编写基础公共类
- 数据库配置文件

driver=com.mysql.cj.jdbc.Driver
url=jdbc:mysql://localhost:3306/smbms?autoReconnect=true&useSSL=true&useUnicode=true&characterEncoding=utf-8&serverTimezone=Asia/Shanghai
username=root
password=123

- 编写数据库的公共类

package com.kwok.dao;import java.io.IOException;
import java.io.InputStream;
import java.sql.*;
import java.util.Properties;// 操作数据库的公共类
public class BaseDao {private static String driver;private static String url;private static String username;private static String password;// 静态代码块。类加载的时候就初始化了static {Properties properties = new Properties();// 通过类加载器读取对应的资源InputStream is = BaseDao.class.getClassLoader().getResourceAsStream("db.properties");try {properties.load(is);} catch (IOException e) {e.printStackTrace();}driver = properties.getProperty("driver");url = properties.getProperty("url");username = properties.getProperty("username");password = properties.getProperty("password");}// 获取数据库的连接public static Connection getConnection(){Connection connection = null;try {Class.forName(driver);connection = DriverManager.getConnection(url, username, password);} catch (Exception e) {e.printStackTrace();}return connection;}// 编写查询公共类public static ResultSet execute(Connection connection,String sql,Object[] params,ResultSet resultSet,PreparedStatement preparedStatement) throws SQLException {// 预编译的sql，在后面直接执行就可以了preparedStatement = connection.prepareStatement(sql);for (int i = 0; i < params.length; i++) {// setObject,占位符从1开始，但是我们的数组从0开始！preparedStatement.setObject(i+1,params[i]);}resultSet = preparedStatement.executeQuery();return resultSet;}// 编写增删改公共方法public static int execute(Connection connection,String sql,Object[] params,PreparedStatement preparedStatement) throws SQLException {preparedStatement = connection.prepareStatement(sql);for (int i = 0; i < params.length; i++) {// setObject,占位符从1开始，但是我们的数组从0开始！preparedStatement.setObject(i+1,params[i]);}int updateRows = preparedStatement.executeUpdate();return updateRows;}// 关闭连接，释放资源public static boolean closeResource(Connection connection,PreparedStatement preparedStatement,ResultSet resultSet){boolean flag = true;if (resultSet!=null){try {resultSet.close();// GC回收resultSet = null;} catch (SQLException throwables) {throwables.printStackTrace();flag = false;}}if (preparedStatement!=null){try {preparedStatement.close();// GC回收preparedStatement = null;} catch (SQLException throwables) {throwables.printStackTrace();flag = false;}}if (connection!=null){try {connection.close();// GC回收connection = null;} catch (SQLException throwables) {throwables.printStackTrace();flag = false;}}return flag;}
}

- 编写字符编码过滤器

package com.kwok.filter;import javax.servlet.*;
import java.io.IOException;public class CharacterEncodingFilter implements Filter {@Overridepublic void init(FilterConfig filterConfig) throws ServletException {}@Overridepublic void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {servletRequest.setCharacterEncoding("utf-8");servletResponse.setCharacterEncoding("utf-8");filterChain.doFilter(servletRequest,servletResponse);}@Overridepublic void destroy() {}
}<!--字符编码过滤器--><filter><filter-name>CharacterEncodingFilter</filter-name><filter-class>com.kwok.filter.CharacterEncodingFilter</filter-class></filter><filter-mapping><filter-name>CharacterEncodingFilter</filter-name><url-pattern>/*</url-pattern></filter-mapping>

导入静态资源

- webapp

登录实现

编写前端页面
设置首页

<!--设置欢迎页面-->
<welcome-file-list><welcome-file>login.jsp</welcome-file>
</welcome-file-list>

编写dao层登录用户登录接口

编写dao接口的实现类

package com.kwok.dao.user;import com.kwok.dao.BaseDao;
import com.kwok.pojo.User;import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;public class UserDaoIml implements UserDao {// 得到要登录的用户@Overridepublic User getLoginUser(Connection connection, String userCode) throws SQLException {PreparedStatement pstm = null;ResultSet rs = null;User user = null;if (connection!=null){String sql = "select * from smbms_user where userCode=?";Object[] params = {userCode};rs = BaseDao.execute(connection, pstm, rs, sql, params);if (rs.next()){user = new User();user.setId(rs.getInt("id"));user.setUserCode(rs.getString("userCode"));user.setUserName(rs.getString("userName"));user.setUserPassword(rs.getString("userPassword"));user.setGender(rs.getInt("gender"));user.setBirthday(rs.getDate("birthday"));user.setPhone(rs.getString("phone"));user.setAddress(rs.getString("address"));user.setUserRole(rs.getInt("userRole"));user.setCreatedBy(rs.getInt("createdBy"));user.setCreationDate(rs.getTimestamp("creationDate"));user.setModifyBy(rs.getInt("modifyBy"));user.setModifyDate(rs.getTimestamp("modifyDate"));}BaseDao.closeResource(null,pstm,rs);}return user;}
}

业务层接口

业务层接口的实现类

package com.kwok.service.user;import com.kwok.dao.BaseDao;
import com.kwok.dao.user.UserDao;
import com.kwok.dao.user.UserDaoIml;
import com.kwok.pojo.User;import java.sql.Connection;
import java.sql.SQLException;public class UserServiceImpl implements UserService {//业务层都会调用dao层，所以我们要引用Dao层private UserDao userDao;public UserServiceImpl(){userDao = new UserDaoIml();}@Overridepublic User login(String userCode, String password) {Connection connection = null;User user = null;try {connection = BaseDao.getConnection();// 通过业务层调用对应的具体的数据库操作user = userDao.getLoginUser(connection, userCode);} catch (SQLException throwables) {throwables.printStackTrace();}finally {BaseDao.closeResource(connection,null,null);}return user;}}

编写Servlet

package com.kwok.servlet.user;import com.kwok.pojo.User;
import com.kwok.service.user.UserServiceImpl;
import com.kwok.util.Constants;import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;public class LoginServlet extends HttpServlet {// Servlet:控制层，调用业务层代码@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {System.out.println("进入loginServlet...");// 获取用户名和密码String userCode = req.getParameter("userCode");String userPassword = req.getParameter("userPassword");// 和数据库中密码进行对比，调用业务层；UserServiceImpl userService = new UserServiceImpl();User user = userService.login(userCode, userPassword); // 这里已经把登录的人查出来了if (user!=null){//查有此人，可以登陆// 将用户的信息放到Session中req.getSession().setAttribute(Constants.USER_SESSION,user);// 跳转到内部主页resp.sendRedirect("jsp/frame.jsp");}else {// 查无此人，无法登陆，转发回登录页面，提示错误req.setAttribute("error","用户名或密码错误！");req.getRequestDispatcher("login.jsp").forward(req,resp);}}@Overrideprotected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {doGet(req, resp);}
}

注册Servlet

 <!--Servlet--><servlet><servlet-name>LoginServlet</servlet-name><servlet-class>com.kwok.servlet.user.LoginServlet</servlet-class></servlet><servlet-mapping><servlet-name>LoginServlet</servlet-name><url-pattern>/user/login.do</url-pattern></servlet-mapping>

测试访问，确保以上功能成功

注销功能(登录功能优化)

- 思路：移除Session,返回登录页面

LogoutServlet

package com.kwok.servlet.user;import com.kwok.util.Constants;import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;public class LogoutServlet extends HttpServlet {@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {// 移除用户的Sessionreq.getSession().removeAttribute(Constants.USER_SESSION);resp.sendRedirect(req.getContextPath()+"/login.jsp");// 返回登录页面}@Overrideprotected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {doGet(req, resp);}
}

注册xml

 <servlet><servlet-name>LogoutServlet</servlet-name><servlet-class>com.kwok.servlet.user.LogoutServlet</servlet-class></servlet><servlet-mapping><servlet-name>LogoutServlet</servlet-name><url-pattern>/jsp/logout.do</url-pattern></servlet-mapping>

登录拦截优化实现

编写一个过滤器并注册

package com.kwok.filter;import com.kwok.pojo.User;
import com.kwok.util.Constants;import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;public class SysFilter implements Filter {@Overridepublic void init(FilterConfig filterConfig) throws ServletException {}@Overridepublic void doFilter(ServletRequest req, ServletResponse resp, FilterChain filterChain) throws IOException, ServletException {HttpServletRequest request = (HttpServletRequest) req;HttpServletResponse response = (HttpServletResponse) resp;// 过滤器，从Session中获取用户User user = (User)request.getSession().getAttribute(Constants.USER_SESSION);if (user==null){// 已经注销了，或者未登录response.sendRedirect("/smbms/error.jsp");}else {filterChain.doFilter(req,resp);}}@Overridepublic void destroy() {}
}<!--用户登录过滤器--><filter><filter-name>SysFilter</filter-name><filter-class>com.kwok.filter.SysFilter</filter-class></filter><filter-mapping><filter-name>SysFilter</filter-name><url-pattern>/jsp/*</url-pattern></filter-mapping>

密码修改实现

1.导入前端页面

2.写项目，建议从底层往上写

3.UserDao接口

// 修改当前用户密码public int updatePwd(Connection connection,int id,String password) throws SQLException;

4.UserDao接口实现类

// 修改当前用户密码@Overridepublic int updatePwd(Connection connection, int id, String password) throws SQLException {PreparedStatement pstm = null;int execute = 0;if (connection!=null){String sql = "update smbms_user set userPassword = ? where id = ?";Object params[] = {password,id};execute = BaseDao.execute(connection, pstm, sql, params);BaseDao.closeResource(null,pstm,null);}return execute;}

5.UserService层

// 根据用户id修改密码public boolean updatePwd(int id, String pwd);

6.UserService实现类

// 根据用户id修改密码@Overridepublic boolean updatePwd(int id, String pwd) {Connection connection = null;boolean flag =false;// 修改密码try {connection = BaseDao.getConnection();if (userDao.updatePwd(connection,id,pwd)>0){flag = true;}} catch (SQLException throwables) {throwables.printStackTrace();}finally {BaseDao.closeResource(connection,null,null);}return flag;}

记得实现servlet复用，需要提取方法

package com.kwok.servlet.user;import com.kwok.pojo.User;
import com.kwok.service.user.UserService;
import com.kwok.service.user.UserServiceImpl;
import com.kwok.util.Constants;
import com.mysql.cj.util.StringUtils;import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;// 实现servlet复用
public class UserServlet extends HttpServlet {@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {String method = req.getParameter("method");if (method.equals("savpwd")&&method!=null){this.updatePwd(req,resp);}}@Overrideprotected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {doGet(req, resp);}public void updatePwd(HttpServletRequest req, HttpServletResponse resp){// 从Session里面拿ID;Object o = req.getSession().getAttribute(Constants.USER_SESSION);String newpassword = req.getParameter("newpassword");boolean flag = false;if (o!=null && newpassword!=null){UserService userService = new UserServiceImpl();flag = userService.updatePwd(((User) o).getId(), newpassword);if (flag){req.setAttribute("message","修改密码成功，请退出使用新密码登录！");// 密码修改成功，移除当前Sessionreq.getSession().removeAttribute(Constants.USER_SESSION);}else {req.setAttribute("message","密码修改失败");}}else {req.setAttribute("message","新密码有问题！");}try {req.getRequestDispatcher("pwdmodify.jsp").forward(req,resp);} catch (ServletException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}
}

7.注册

 <servlet><servlet-name>UserServlet</servlet-name><servlet-class>com.kwok.servlet.user.UserServlet</servlet-class></servlet><servlet-mapping><servlet-name>UserServlet</servlet-name><url-pattern>/jsp/user.do</url-pattern></servlet-mapping>

8.测试

Ajax验证旧密码实现

1.阿里巴巴的fastjson

<!-- https://mvnrepository.com/artifact/com.alibaba/fastjson -->
<dependency><groupId>com.alibaba</groupId><artifactId>fastjson</artifactId><version>1.2.76</version>
</dependency>

2.后台添加代码修改方法

package com.kwok.servlet.user;import com.alibaba.fastjson.JSONArray;
import com.kwok.pojo.User;
import com.kwok.service.user.UserService;
import com.kwok.service.user.UserServiceImpl;
import com.kwok.util.Constants;
import com.mysql.cj.util.StringUtils;import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.HashMap;
import java.util.Map;// 实现servlet复用
public class UserServlet extends HttpServlet {@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {String method = req.getParameter("method");if (method.equals("savepwd")&&method!=null){this.updatePwd(req,resp);}else if (method.equals("pwdmodify")&&method!=null){this.pwdModify(req,resp);}}@Overrideprotected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {doGet(req, resp);}// 修改密码public void updatePwd(HttpServletRequest req, HttpServletResponse resp){// 从Session里面拿ID;Object o = req.getSession().getAttribute(Constants.USER_SESSION);String newpassword = req.getParameter("newpassword");boolean flag = false;if (o!=null && newpassword!=null){UserService userService = new UserServiceImpl();flag = userService.updatePwd(((User) o).getId(), newpassword);if (flag){req.setAttribute("message","修改密码成功，请退出使用新密码登录！");// 密码修改成功，移除当前Sessionreq.getSession().removeAttribute(Constants.USER_SESSION);}else {req.setAttribute("message","密码修改失败");}}else {req.setAttribute("message","新密码有问题！");}try {req.getRequestDispatcher("pwdmodify.jsp").forward(req,resp);} catch (ServletException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}// 验证旧密码,Session中有用户的密码public void pwdModify(HttpServletRequest req, HttpServletResponse resp){// 从Session里面拿ID;Object o = req.getSession().getAttribute(Constants.USER_SESSION);String oldpassword = req.getParameter("oldpassword");// 万能的Map:结果集Map<String, String> resultMap = new HashMap<String,String>();if (o==null){// Session失效了，session过期了resultMap.put("result","sessionerror");}else if (StringUtils.isNullOrEmpty(oldpassword)){// 输入的密码为空resultMap.put("result","error");}else {String userPassword = ((User) o).getUserPassword(); // Session中用户的密码if (oldpassword.equals(userPassword)){resultMap.put("result","true");}else {resultMap.put("result","false");}}try {resp.setContentType("application/json");PrintWriter writer = resp.getWriter();// JSONArray 阿里巴巴的JSON工具类,转换格式的/*resultMap = ["result","sessionerror","result","true"]转Json格式 {key:value}*/writer.write(JSONArray.toJSONString(resultMap));writer.flush();writer.close();} catch (IOException e) {e.printStackTrace();}}
}

3.测试：

用户管理实现

思路：

1.导入分页的工具类

PageSupport类拷过来（静态资源）

package com.kwok.util;public class PageSupport {//当前页码-来自于用户输入private int currentPageNo = 1;//总数量（表）private int totalCount = 0;//页面容量private int pageSize = 0;//总页数-totalCount/pageSize（+1）private int totalPageCount = 1;public int getCurrentPageNo() {return currentPageNo;}public void setCurrentPageNo(int currentPageNo) {if(currentPageNo > 0){this.currentPageNo = currentPageNo;}}public int getTotalCount() {return totalCount;}public void setTotalCount(int totalCount) {if(totalCount > 0){this.totalCount = totalCount;//设置总页数this.setTotalPageCountByRs();}}public int getPageSize() {return pageSize;}public void setPageSize(int pageSize) {if(pageSize > 0){this.pageSize = pageSize;}}public int getTotalPageCount() {return totalPageCount;}public void setTotalPageCount(int totalPageCount) {this.totalPageCount = totalPageCount;}public void setTotalPageCountByRs(){if(this.totalCount % this.pageSize == 0){this.totalPageCount = this.totalCount / this.pageSize;}else if(this.totalCount % this.pageSize > 0){this.totalPageCount = this.totalCount / this.pageSize + 1;}else{this.totalPageCount = 0;}}}

2.用户列表页面导入

- userlist.jsp
- rollpage.jsp

3.用户展示实现

1.获取用户数量

UserDao

// 根据用户名或角色查询用户总数public int getUserCount(Connection connection,String username,int userRole) throws SQLException;

UserDaoImpl

// 根据用户名或角色查询用户总数[最难理解的SQL]@Overridepublic int getUserCount(Connection connection, String username, int userRole) throws SQLException {PreparedStatement pstm = null;ResultSet rs = null;int count = 0;if (connection!=null){StringBuffer sql = new StringBuffer();sql.append("select count(1) as count from smbms_user u,smbms_role r where u.userRole = r.id");ArrayList<Object> list = new ArrayList<Object>();// 存放我们的参数if (!StringUtils.isNullOrEmpty(username)){sql.append(" and u.userName like ?");list.add("%"+username+"%"); // index:0}if (userRole>0){sql.append(" and u.userRole = ?");list.add(userRole); // index:1}// 怎么把list转换为数组Object[] params = list.toArray();System.out.println("UserDaoIml->getUserCount"+sql.toString()); // 输出完整的sql语句rs = BaseDao.execute(connection, pstm, rs, sql.toString(), params);if (rs.next()){count = rs.getInt("count"); // 从结果集中获取最终的数量}BaseDao.closeResource(null,pstm,rs);}return count;}

UserService

// 查询用户总数public int getUserCount(String username,int userRole);

UserServiceImpl

// 查询用户总数@Overridepublic int getUserCount(String username, int userRole) {Connection connection =null;int count = 0;try {connection = BaseDao.getConnection();count = userDao.getUserCount(connection, username, userRole);} catch (SQLException throwables) {throwables.printStackTrace();}finally {BaseDao.closeResource(connection,null,null);}return count;}

2.获取用户列表

UserDao

// 通过条件查询-userlistpublic List<User> getUserList(Connection connection,String username,int userRole,int currentPageNo,int pageSize) throws Exception;

UserDaoImpl

// 通过条件查询-userlist@Overridepublic List<User> getUserList(Connection connection, String username, int userRole, int currentPageNo, int pageSize) throws Exception {PreparedStatement pstm = null;ResultSet rs = null;List<User> userlist = new ArrayList<User>();if (connection != null){StringBuffer sql = new StringBuffer();sql.append("select u.*,r.roleName as userRoleName from smbms_user u,smbms_role r where u.userRole = r.id");List<Object> list = new ArrayList<Object>();if (!StringUtils.isNullOrEmpty(username)){sql.append(" and u.userName like ?");list.add("%"+username+"%");}if (userRole > 0){sql.append(" and u.userRole = ?");list.add(userRole);}sql.append(" order by creationDate DESC limit ?,?");currentPageNo = (currentPageNo-1)*pageSize;list.add(currentPageNo);list.add(pageSize);Object[] params = list.toArray();System.out.println("sql->"+sql.toString());rs = BaseDao.execute(connection,pstm,rs,sql.toString(),params);while (rs.next()){User _user = new User();_user.setId(rs.getInt("id"));_user.setUserCode(rs.getString("userCode"));_user.setUserName(rs.getString("userName"));_user.setGender(rs.getInt("gender"));_user.setBirthday(rs.getDate("birthday"));_user.setPhone(rs.getString("phone"));_user.setUserRole(rs.getInt("userRole"));_user.setUserRoleName(rs.getString("userRoleName"));userlist.add(_user);}BaseDao.closeResource(null,pstm,rs);}return userlist;}

UserService

// 根据条件查询用户列表public List<User> getUserList(String queryUserName,int queryUserRole,int currentPageNo,int pageSize);

UserServiceImpl

// 根据条件查询用户列表@Overridepublic List<User> getUserList(String queryUserName, int queryUserRole, int currentPageNo, int pageSize) {Connection connection = null;List<User> userList = null;try {connection = BaseDao.getConnection();userDao.getUserList(connection,queryUserName,queryUserRole,currentPageNo,pageSize);} catch (Exception throwables) {throwables.printStackTrace();}finally {BaseDao.closeResource(connection,null,null);}return userList;}

3.获取角色操作

为了职责统一，可以把角色的操作单独放在一个包中，并和POJO类进行对应。

RoleDao

package com.kwok.dao.role;import com.kwok.pojo.Role;import java.sql.Connection;
import java.sql.SQLException;
import java.util.List;public interface RoleDao {// 获取角色列表public List<Role> getRoleList(Connection connection) throws SQLException;
}

RoleDaoImpl

package com.kwok.dao.role;import com.kwok.dao.BaseDao;
import com.kwok.pojo.Role;import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;public class RoleDaoImpl implements RoleDao {// 获取角色列表@Overridepublic List<Role> getRoleList(Connection connection) throws SQLException {PreparedStatement pstm = null;ResultSet resultSet = null;ArrayList<Role> rolelist = new ArrayList<Role>();if (connection!=null){String sql = "select * from smbms_role";Object[] params = {};resultSet = BaseDao.execute(connection, pstm, resultSet, sql, params);while (resultSet.next()){Role _role = new Role();_role.setId(resultSet.getInt("id"));_role.setRoleCode(resultSet.getString("roleCode"));_role.setRoleName(resultSet.getString("roleName"));rolelist.add(_role);}BaseDao.closeResource(null,pstm,resultSet);}return rolelist;}
}

RoleService

package com.kwok.service.role;import com.kwok.pojo.Role;import java.util.List;public interface RoleService {// 根据条件角色列表public List<Role> getRoleList();
}

RoleServiceImpl

package com.kwok.service.role;import com.kwok.dao.BaseDao;
import com.kwok.dao.role.RoleDao;
import com.kwok.dao.role.RoleDaoImpl;
import com.kwok.pojo.Role;import java.sql.Connection;
import java.sql.SQLException;
import java.util.List;public class RoleServiceImpl implements RoleService {// 引入Daoprivate RoleDao roleDao;public RoleServiceImpl(){roleDao = new RoleDaoImpl();}// 根据条件角色列表@Overridepublic List<Role> getRoleList() {Connection connection = null;List<Role> roleList = null;try {connection = BaseDao.getConnection();roleList = roleDao.getRoleList(connection);} catch (SQLException throwables) {throwables.printStackTrace();}finally {BaseDao.closeResource(connection,null,null);}return roleList;}
}

4.用户显示的Servlet

添加query方法：

- 获取用户前端的数据（查询）
- 判断请求是否需要执行，看参数的值判断
- 为了实现分页，需要计算出当前页面和总页面，页面大小…
- 用户列表展示
- 返回前端

// （重点，难点）获取用户列表public void query(HttpServletRequest req, HttpServletResponse resp){// 查询用户列表// 从前端获取数据String queryUserName = req.getParameter("queryname");String temp = req.getParameter("queryUserRole");String pageIndex = req.getParameter("pageIndex");int queryUserRole = 0;// 获取用户列表UserServiceImpl userService = new UserServiceImpl();List<User> userList = null;// 第一次走这个请求，一定是第一页，页面大小固定int pageSize = 5; // 可以把这个写在配置文件中，方便后期修改int currentPageNo = 1;if (queryUserName == null){queryUserName = "";}if (temp!=null && !temp.equals("")){queryUserRole = Integer.parseInt(temp); // 给查询赋个值}if (pageIndex!=null){currentPageNo = Integer.parseInt(pageIndex);}// 获取用户的总数(分页：上一页，下一页的情况)int totalCount = userService.getUserCount(queryUserName, queryUserRole);// 总页数支持PageSupport pageSupport = new PageSupport();pageSupport.setCurrentPageNo(currentPageNo);pageSupport.setPageSize(pageSize);pageSupport.setTotalCount(totalCount);int totalPageCount = ((int)(totalCount/pageSize))+1; // 总共有几页// 控制首页和尾页// 如果页面小于1了，就显示第一页数据if (totalPageCount<1){currentPageNo = 1;}else if (currentPageNo>totalPageCount){// 当前页面大于最后一页currentPageNo = totalPageCount;}// 获取用户列表展示userList = userService.getUserList(queryUserName, queryUserRole, currentPageNo, pageSize);req.setAttribute("userList",userList);// 获取角色列表展示RoleServiceImpl roleService = new RoleServiceImpl();List<Role> roleList = roleService.getRoleList();req.setAttribute("roleList",roleList);req.setAttribute("totalCount",totalCount);req.setAttribute("currentPageNo",currentPageNo);req.setAttribute("totalPageCount",totalPageCount);req.setAttribute("queryUserName",queryUserName);req.setAttribute("queryUserRole",queryUserRole);// 返回前端try {req.getRequestDispatcher("userlist.jsp").forward(req,resp);} catch (ServletException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}
小黄鸭调试法：程序员修炼之道和小黄鸭边说边分析（物体）

5.测试结果

4.增加用户实现

UserDao

// 新增用户信息public int add(Connection connection,User user) throws Exception;

UserDaoImpl

// 新增用户信息@Overridepublic int add(Connection connection, User user) throws Exception {PreparedStatement pstm = null;int updateRows = 0;if (null != connection){String sql = "insert into smbms_user (userCode,userName,userPassword," +"userRole,gender,birthday,phone,address,creationDate,createdBy)" +" values (?,?,?,?,?,?,?,?,?,?)";Object[] params = {user.getUserCode(),user.getUserName(),user.getUserPassword(),user.getUserRole(),user.getGender(),user.getBirthday(),user.getPhone(),user.getAddress(),user.getCreationDate(),user.getCreatedBy()};updateRows = BaseDao.execute(connection,pstm,sql,params);BaseDao.closeResource(null,pstm,null);}return updateRows;}

UserService

// 新增用户信息public boolean add(User user);

UserServiceImpl

// 新增用户信息@Overridepublic boolean add(User user) {Boolean flag = false;Connection connection = null;try {connection = BaseDao.getConnection();connection.setAutoCommit(false); // 开启JDBC事务管理int updateRows = userDao.add(connection,user);connection.commit();if (updateRows > 0){flag = true;System.out.println("add success");}else {System.out.println("add faild");}} catch (Exception throwables) {throwables.printStackTrace();try {connection.rollback();} catch (SQLException e) {e.printStackTrace();}}finally {// 在service层进行connection的关闭BaseDao.closeResource(connection,null,null);}return flag;}

UserServlet

// 新增用户public void adduser(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException {System.out.println("新增用户");String userCode = req.getParameter("userCode");String userName = req.getParameter("userName");String userPassword = req.getParameter("userPassword");String gender = req.getParameter("gender");String birthday = req.getParameter("birthday");String phone = req.getParameter("phone");String address = req.getParameter("address");String userRole = req.getParameter("userRole");User user = new User();user.setUserCode(userCode);user.setUserName(userName);user.setUserPassword(userPassword);user.setAddress(address);try {user.setBirthday(new SimpleDateFormat("yyyy-MM-dd").parse(birthday));} catch (ParseException e) {e.printStackTrace();}user.setGender(Integer.valueOf(gender));user.setPhone(phone);user.setUserRole(Integer.valueOf(userRole));user.setCreationDate(new Date());user.setCreatedBy(((User)req.getSession().getAttribute(Constants.USER_SESSION)).getId());System.out.println(((User)req.getSession().getAttribute(Constants.USER_SESSION)).getId());UserServiceImpl userService = new UserServiceImpl();if (userService.add(user)){resp.sendRedirect(req.getContextPath()+"/jsp/user.do?method=query");}else {req.getRequestDispatcher("useradd.jsp").forward(req,resp);}}

测试结果

5.删除用户实现

UserDao

// 删除用户信息public int deleteUserById(Connection connection,int delId) throws Exception;

UserDaoImpl

// 删除用户信息@Overridepublic int deleteUserById(Connection connection, int delId) throws Exception {PreparedStatement pstm = null;int updateRows = 0;List<Object> list = new ArrayList<Object>();if (null != connection){String sql = "delete from smbms_user where id=?";list.add(delId);Object[] params = list.toArray();System.out.println("sql->"+sql.toString());updateRows = BaseDao.execute(connection,pstm,sql,params);BaseDao.closeResource(null,pstm,null);}return updateRows;}

UserService

// 删除用户信息public boolean deleteUserById(Integer delId);

UserServiceImpl

// 删除用户信息@Overridepublic boolean deleteUserById(Integer delId) {Connection connection = null;boolean flag = false;try {connection = BaseDao.getConnection();if (userDao.deleteUserById(connection,delId) > 0){flag = true;}} catch (Exception e) {e.printStackTrace();}finally {BaseDao.closeResource(connection,null,null);}return flag;}

UserServlet

// 删除用户public void deluser(HttpServletRequest req, HttpServletResponse resp) throws IOException {System.out.println("删除用户");String id = req.getParameter("uid");Integer delId = 0;try {delId = Integer.parseInt(id);}catch (Exception e){delId = 0;}HashMap<String, String> resultMap = new HashMap<String, String>();if (delId <= 0){resultMap.put("delResult","notexist");}else {UserServiceImpl userService = new UserServiceImpl();if (userService.deleteUserById(delId)){resultMap.put("delResult","true");}else {resultMap.put("delResult","false");}}// 把resultMap转换为json对象输出resp.setContentType("application/json");PrintWriter outPrinterWriter = resp.getWriter();outPrinterWriter.write(JSONArray.toJSONString(resultMap));outPrinterWriter.flush();outPrinterWriter.close();}

测试结果

6.修改用户实现

UserDao

// 通过userId获得userpublic User getUserById(Connection connection,String id) throws Exception;// 修改用户信息public int modify(Connection connection,User user,String id) throws Exception;

UserDaoImpl

// 通过userId获得user@Overridepublic User getUserById(Connection connection, String id) throws Exception {User user = null;PreparedStatement pstm = null;ResultSet rs = null;if (null != connection){String sql = "select u.*,r.roleName as userRoleName from smbms_user u,smbms_role r where u.id=? and u.userRole = r.id";Object[] params = {id};rs = BaseDao.execute(connection, pstm, rs, sql, params);if (rs.next()){user = new User();user.setId(rs.getInt("id"));user.setUserCode(rs.getString("userCode"));user.setUserName(rs.getString("userName"));user.setUserPassword(rs.getString("userPassword"));user.setGender(rs.getInt("gender"));user.setBirthday(rs.getDate("birthday"));user.setPhone(rs.getString("phone"));user.setAddress(rs.getString("address"));user.setUserRole(rs.getInt("userRole"));user.setCreatedBy(rs.getInt("createdBy"));user.setCreationDate(rs.getTimestamp("creationDate"));user.setModifyBy(rs.getInt("modifyBy"));user.setModifyDate(rs.getTimestamp("modifyDate"));user.setUserRoleName(rs.getString("userRoleName"));}BaseDao.closeResource(null,pstm,rs);}return user;}// 修改用户信息@Overridepublic int modify(Connection connection, User user,String id) throws Exception {PreparedStatement pstm = null;int updateRows = 0;if (null != connection){String sql = "update smbms_user set userName=?,gender=?,birthday=?,phone=?,address=?,userRole=?,modifyBy=?,modifyDate=? where id=?";Object[] params = {user.getUserName(),user.getGender(),user.getBirthday(),user.getPhone(),user.getAddress(),user.getUserRole(),user.getModifyBy(),user.getModifyDate(),id};updateRows = BaseDao.execute(connection,pstm,sql,params);BaseDao.closeResource(null,pstm,null);}return updateRows;}

UserService

// 通过userId获得userpublic User getUserById(String id);// 修改用户信息public boolean modify(User user,String id);

UserServiceImpl

// 通过userId获得user@Overridepublic User getUserById(String id) {User user = null;Connection connection = null;try {connection = BaseDao.getConnection();user = userDao.getUserById(connection,id);} catch (Exception e) {e.printStackTrace();user = null;}finally {BaseDao.closeResource(connection,null,null);}return user;}// 修改用户信息@Overridepublic boolean modify(User user,String id) {Boolean flag = false;Connection connection = null;try {connection = BaseDao.getConnection();connection.setAutoCommit(false); // 开启JDBC事务管理int updateRows = userDao.modify(connection,user,id);connection.commit();if (updateRows > 0){flag = true;System.out.println("modify success");}else {System.out.println("modify faild");}} catch (Exception throwables) {throwables.printStackTrace();try {connection.rollback();} catch (SQLException e) {e.printStackTrace();}}finally {// 在service层进行connection的关闭BaseDao.closeResource(connection,null,null);}return flag;}

UserServlet

// 根据id获取用户信息public void getUserById(HttpServletRequest req, HttpServletResponse resp,String url) throws ServletException, IOException {String id = req.getParameter("uid");if (!StringUtils.isNullOrEmpty(id)){// 调用后台方法得到user对象UserService userService = new UserServiceImpl();User user = userService.getUserById(id);req.setAttribute("user",user);req.getRequestDispatcher(url).forward(req,resp);}}// 修改用户信息public void modify(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException {String id = req.getParameter("uid");String userName = req.getParameter("userName");String gender = req.getParameter("gender");String birthday = req.getParameter("birthday");String phone = req.getParameter("phone");String address = req.getParameter("address");String userRole = req.getParameter("userRole");User user = new User();user.setUserName(userName);user.setGender(Integer.valueOf(gender));try {user.setBirthday(new SimpleDateFormat("yyyy-MM-dd").parse(birthday));} catch (ParseException e) {e.printStackTrace();}user.setPhone(phone);user.setAddress(address);user.setUserRole(Integer.valueOf(userRole));user.setModifyDate(new Date());user.setModifyBy(((User)req.getSession().getAttribute(Constants.USER_SESSION)).getId());UserServiceImpl userService = new UserServiceImpl();if (userService.modify(user,id)){resp.sendRedirect(req.getContextPath()+"/jsp/user.do?method=query");}else {req.getRequestDispatcher("usermodify.jsp").forward(req,resp);}}

7.查看用户实现

UserServlet

// 查看用户信息public void userview(HttpServletRequest req, HttpServletResponse resp,String url) throws ServletException, IOException {System.out.println("查看用户信息");String id = req.getParameter("uid");if (!StringUtils.isNullOrEmpty(id)){// 调用后台方法得到user对象UserService userService = new UserServiceImpl();User user = userService.getUserById(id);req.setAttribute("user",user);req.getRequestDispatcher(url).forward(req,resp);}}

项目所有代码：

https://gitee.com/mr-kwok/smbms

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JavaWeb-smbms项目

项目搭建

登录实现

注销功能(登录功能优化)

LogoutServlet

注册xml

登录拦截优化实现

密码修改实现

1.导入前端页面

2.写项目，建议从底层往上写

3.UserDao接口

4.UserDao接口实现类

5.UserService层

6.UserService实现类

7.注册

8.测试

Ajax验证旧密码实现

1.阿里巴巴的fastjson

2.后台添加代码修改方法

3.测试：

用户管理实现

1.导入分页的工具类

2.用户列表页面导入

3.用户展示实现

1.获取用户数量

2.获取用户列表

3.获取角色操作

4.用户显示的Servlet

5.测试结果

4.增加用户实现

UserDao

UserDaoImpl

UserService

UserServiceImpl

UserServlet

测试结果

5.删除用户实现

UserDao

UserDaoImpl

UserService

UserServiceImpl

UserServlet

测试结果

6.修改用户实现

UserDao

UserDaoImpl

UserService

UserServiceImpl

UserServlet

7.查看用户实现

UserServlet

项目所有代码：

JavaWeb-smbms项目相关推荐

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