前言

最近写了个课设，刚好刚学完javaweb需要巩固一下，课设内容是java增删改查，想睡觉有人送枕头了属于是，这里我是实现了增删改查，删除那里我就偷懒了，只写了批量删除。（实际上就是黑马项目套皮，不过我实现了修改功能，还是有点价值滴）

项目逻辑

后端写好Servlet服务，前端通过ajax申请服务，并将表中数据通过Servlet与后台数据库交互，从而达到前端和后端互通的效果。

一、Mapper层实现代码

1.BookMapper.class

代码如下（示例）：

package com.MyJavaClass.mapper;import com.MyJavaClass.pojo.Book;
import org.apache.ibatis.annotations.*;import java.util.List;public interface BookMapper {@Select("select * from books")List<Book> selectAll();@Insert("insert into books values(null,#{bookName},#{writer},#{user},#{number},#{state})")void add(Book book);List<Book> selectBycondition();void deleteByIds(@Param("ids")int[] ids);@Select("select * from books limit #{begin}, #{size}")List<Book> selectByPage(@Param("begin")int begin,@Param("size") int size);@Select("select count(*) from books")int selectTotalCount();List<Book> selectByPageAndCondition(@Param("begin") int begin,@Param("size") int size,@Param("book") Book book);int selectTotalCountByCondition(Book book);@Update("update books set bookName = #{bookName}, writer = #{writer},user = #{user}, number = #{number}, state = #{state} where id = #{id}")void updateById(Book book);
}

2.BookMapper.xml

代码如下（示例）：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapperPUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.MyJavaClass.mapper.BookMapper"><select id="selectBycondition" resultType="com.MyJavaClass.pojo.Book">select * from books<where><if test=""></if></where></select><delete id="deleteByIds">delete from books where id in<foreach collection="ids" item="id" separator="," open="(" close=")">#{id}</foreach></delete><select id="selectByPageAndCondition" resultType="com.MyJavaClass.pojo.Book">select * from books<where><if test="book.number != null and book.number != '' ">and  number like #{book.number}</if><if test="book.bookName != null and book.bookName != '' ">and  bookName like #{book.bookName}</if><if test="book.writer != null and book.writer != '' ">and  writer like #{book.writer}</if><if test="book.state != null">and  state = #{book.state}</if></where>limit #{begin},#{size}</select><select id="selectTotalCountByCondition" resultType="java.lang.Integer">select count(*)from books<where><if test="number != null and number != '' ">and  number like #{number}</if><if test="bookName != null and bookName != '' ">and  bookName like #{bookName}</if><if test="writer != null and writer != '' ">and  writer like #{book.writer}</if><if test="state != null">and  state = #{state}</if></where></select>
</mapper>

二、Book数据类型

1.Book.class

    Integer id;String number;String bookName ;String writer ;String user ;Integer state ;

2.MySQL

id int PRIMARY KEY auto_increment,bookName varchar(20),writer varchar(20),user varchar(20),number varchar(20),state INT

三、Service层

1、Service接口

文件名：BookService

package com.MyJavaClass.service;import com.MyJavaClass.pojo.Book;
import com.MyJavaClass.pojo.PageBean;import java.util.List;public interface BookService {List<Book> selectAll();void add(Book book);void deleteByIds(int[] ids);PageBean<Book> selectByPage(int currentPage,int pageSize);PageBean<Book> selectByPageAndCondition(int currentPage,int pageSize,Book book);void updateById(Book book);
}

2、Service实现类

文件名：BookServiceimpl

package com.MyJavaClass.service.impl;import com.MyJavaClass.mapper.BookMapper;
import com.MyJavaClass.pojo.Book;
import com.MyJavaClass.pojo.PageBean;
import com.MyJavaClass.service.BookService;
import com.MyJavaClass.util.SqlSessionFactoryUtils;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;import java.util.List;public class BookServiceimpl implements BookService {SqlSessionFactory factory = SqlSessionFactoryUtils.getSqlSessionFactory();public List<Book> selectAll(){SqlSession sqlSession = factory.openSession();BookMapper bookMapper = sqlSession.getMapper(BookMapper.class);List<Book> books = bookMapper.selectAll();sqlSession.close();return books;}public void add(Book book){SqlSession sqlSession = factory.openSession();BookMapper bookMapper = sqlSession.getMapper(BookMapper.class);bookMapper.add(book);sqlSession.commit();sqlSession.close();}public void deleteByIds(int[] ids){SqlSession sqlSession = factory.openSession();BookMapper bookMapper = sqlSession.getMapper(BookMapper.class);bookMapper.deleteByIds(ids);sqlSession.commit();sqlSession.close();}@Overridepublic PageBean<Book> selectByPage(int currentPage, int pageSize) {SqlSession sqlSession = factory.openSession();BookMapper bookMapper = sqlSession.getMapper(BookMapper.class);int begin = (currentPage - 1) * pageSize;int size = pageSize;List<Book> rows = bookMapper.selectByPage(begin,size);int totalCount = bookMapper.selectTotalCount();PageBean<Book> pageBean = new PageBean<>();pageBean.setRows(rows);pageBean.setTotalCount(totalCount);sqlSession.close();return pageBean;}@Overridepublic PageBean<Book> selectByPageAndCondition(int currentPage, int pageSize, Book book) {SqlSession sqlSession = factory.openSession();BookMapper bookMapper = sqlSession.getMapper(BookMapper.class);int begin = (currentPage - 1) * pageSize;int size = pageSize;String number = book.getNumber();if(number != null && number.length()>0){book.setNumber("%" + number + "%");}String bookName = book.getBookName();if(bookName != null && bookName.length()>0){book.setBookName("%" + bookName + "%");}String writer = book.getWriter();if(writer != null && writer.length()>0){book.setWriter("%" + writer + "%");}List<Book> rows = bookMapper.selectByPageAndCondition(begin,size,book);int totalCount = bookMapper.selectTotalCountByCondition(book);PageBean<Book> pageBean = new PageBean<>();pageBean.setRows(rows);pageBean.setTotalCount(totalCount);sqlSession.close();return pageBean;}public void updateById(Book book){SqlSession sqlSession = factory.openSession();BookMapper bookMapper = sqlSession.getMapper(BookMapper.class);bookMapper.updateById(book);sqlSession.commit();sqlSession.close();}
}

四、Servlet层

文件名：BookServlet.class

package com.MyJavaClass.web;import com.MyJavaClass.pojo.Book;
import com.MyJavaClass.pojo.PageBean;
import com.MyJavaClass.service.BookService;
import com.MyJavaClass.service.impl.BookServiceimpl;
import com.alibaba.fastjson.JSON;import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.BufferedReader;
import java.io.IOException;
import java.util.List;@WebServlet("/Book/*")
public class BookServlet extends BaseServlet{private BookService bookService = new BookServiceimpl();public void selectAll(HttpServletRequest req, HttpServletResponse resp)throws ServletException,IOException{List<Book> books = bookService.selectAll();String jsonString = JSON.toJSONString(books);resp.setContentType("text/json;charset=utf-8");resp.getWriter().write(jsonString);}public void add(HttpServletRequest req,HttpServletResponse resp)throws ServletException,IOException{BufferedReader br = req.getReader();String params = br.readLine();Book book = JSON.parseObject(params,Book.class);bookService.add(book);resp.getWriter().write("success");}public void deleteByIds(HttpServletRequest req,HttpServletResponse resp)throws ServletException,IOException{BufferedReader br = req.getReader();String params = br.readLine();int[] ids = JSON.parseObject(params,int[].class);bookService.deleteByIds(ids);resp.getWriter().write("success");}public void selectByPage(HttpServletRequest req,HttpServletResponse resp)throws ServletException,IOException{String _currentPage = req.getParameter("currentPage");String _pageSize = req.getParameter("pageSize");int currentPage = Integer.parseInt(_currentPage);int pageSize = Integer.parseInt(_pageSize);//2. 调用service查询PageBean<Book> pageBean = bookService.selectByPage(currentPage, pageSize);//2. 转为JSONString jsonString = JSON.toJSONString(pageBean);//3. 写数据resp.setContentType("text/json;charset=utf-8");resp.getWriter().write(jsonString);}public void selectByPageAndCondition(HttpServletRequest req,HttpServletResponse resp)throws ServletException,IOException{String _currentPage = req.getParameter("currentPage");String _pageSize = req.getParameter("pageSize");int currentPage = Integer.parseInt(_currentPage);int pageSize = Integer.parseInt(_pageSize);BufferedReader br = req.getReader();String params = br.readLine();Book book = JSON.parseObject(params,Book.class);PageBean<Book> pageBean = bookService.selectByPageAndCondition(currentPage,pageSize,book);String jsonString = JSON.toJSONString(pageBean);resp.setContentType("text/json;charset=utf-8");resp.getWriter().write(jsonString);}public void updateById(HttpServletRequest req,HttpServletResponse resp)throws ServletException,IOException{//        String id = req.getParameter("id");BufferedReader br = req.getReader();String params = br.readLine();Book book = JSON.parseObject(params, Book.class);if(book!=null){System.out.println("ok");System.out.println(book);}else System.out.println("no");bookService.updateById(book);resp.getWriter().write("success");}
}

五、前端代码实现

文件名：Book.html

<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>Title</title><style>.el-table .warning-row {background: oldlace;}.el-table .success-row {background: #f0f9eb;}body{background:url("img/p.png") no-repeat center top;background-size:cover;background-attachment:fixed;opacity:0.75;}</style></head>
<body>
<div id="app"><!--搜索表单--><el-form :inline="true" :model="book" class="demo-form-inline"><el-form-item label="当前状态"><el-select v-model="book.state" placeholder="当前状态"><el-option label="在库中" value="1"></el-option><el-option label="未在库中" value="0"></el-option></el-select></el-form-item><el-form-item label="书籍编号"><el-input v-model="book.number" placeholder="书籍编号"></el-input></el-form-item><el-form-item label="书籍名称"><el-input v-model="book.bookName" placeholder="书籍名称"></el-input></el-form-item><el-form-item label="作者"><el-input v-model="book.writer" placeholder="作者"></el-input></el-form-item><el-form-item><el-button type="primary" @click="onSubmit">查询</el-button></el-form-item></el-form><!--按钮--><el-row><el-button type="danger" plain @click="deleteByIds">批量删除</el-button><el-button type="primary" plain @click="dialogVisible = true">新增</el-button><el-button type="success" onclick="window.location.href='student.html'"plain>学生信息查询</el-button></el-row><!--添加数据对话框表单--><el-dialogtitle="新增书籍":visible.sync="dialogVisible"width="30%"><el-form ref="form" :model="book" label-width="80px"><el-form-item label="书籍编号"><el-input v-model="book.number"></el-input></el-form-item><el-form-item label="书籍名称"><el-input v-model="book.bookName"></el-input></el-form-item><el-form-item label="作者"><el-input v-model="book.writer"></el-input></el-form-item><el-form-item label="借阅人"><el-input v-model="book.user"></el-input></el-form-item><el-form-item label="状态"><el-switch v-model="book.state"active-value="1"inactive-value="0"></el-switch></el-form-item><el-form-item><el-button type="primary" @click="addBrand">提交</el-button><el-button @click="dialogVisible = false">取消</el-button></el-form-item></el-form></el-dialog><el-dialogtitle="修改书籍":visible.sync="dialog2Visible"width="30%"><el-form ref="form" :model="brandSelect" label-width="80px"><el-form-item label="书籍编号"><el-input v-model="brandSelect.number"></el-input></el-form-item><el-form-item label="书籍名称"><el-input v-model="brandSelect.bookName"></el-input></el-form-item><el-form-item label="作者"><el-input v-model="brandSelect.writer"></el-input></el-form-item><el-form-item label="借阅人"><el-input v-model="brandSelect.user"></el-input></el-form-item><el-form-item label="状态"><el-switch v-model="brandSelect.state"active-value="1"inactive-value="0"></el-switch></el-form-item><el-form-item><el-button type="primary" @click="update">提交</el-button><el-button @click="dialog2Visible = false">取消</el-button></el-form-item></el-form></el-dialog><!--表格--><template ><el-table:data="tableData"style="width: 100%":row-class-name="tableRowClassName"@selection-change="handleSelectionChange"><el-table-columntype="selection"width="55"></el-table-column><el-table-columntype="index"width="50"></el-table-column><el-table-columnprop="number"label="书籍编号"align="center"></el-table-column><el-table-columnprop="bookName"label="书籍名称"align="center"></el-table-column><el-table-columnprop="writer"align="center"label="作者"></el-table-column><el-table-columnprop="state"align="center"label="当前状态"></el-table-column><el-table-columnprop="user"align="center"label="借阅人"></el-table-column><el-table-columnalign="center"label="操作"><template slot-scope="scope"><el-row><el-button type="primary"@click="brandShow(scope.row)">修改</el-button></el-row></template></el-table-column></el-table></template><!--分页工具条--><el-pagination@size-change="handleSizeChange"@current-change="handleCurrentChange":current-page="currentPage":page-sizes="[5, 10, 15, 20]":page-size="5"layout="total, sizes, prev, pager, next, jumper":total="totalCount"></el-pagination></div><script src="js/axios-0.18.0.js"></script>
<script src="js/vue.js"></script>
<script src="element-ui/lib/index.js"></script>
<link rel="stylesheet" href="element-ui/lib/theme-chalk/index.css"><script>new Vue({el: "#app",mounted(){<!--     //当页面加载完成后，发送异步请求，获取数据-->
<!--     var _this = this;-->
<!--     axios({-->
<!--         method:"get",-->
<!--         url:"http://localhost:8080/curriculumDesign/Book/selectAll"-->
<!--     }).then(function (resp) {-->
<!--         _this.tableData = resp.data;-->
<!--     })-->
this.selectAll();},     methods: {//根据id查询selectAll(){var _this = this;
axios({method:"post",url:"http://localhost:8080/curriculumDesign/Book/selectByPage?currentPage="+this.currentPage+"&pageSize=" + this.pageSize
}).then(resp =>{//设置表格数据_this.tableData = resp.data.rows; // {rows:[],totalCount:100}//设置总记录数_this.totalCount = resp.data.totalCount;
})
},tableRowClassName({row, rowIndex}) {if (rowIndex === 1) {return 'warning-row';} else if (rowIndex === 3) {return 'success-row';}return '';},// 复选框选中后执行的方法handleSelectionChange(val) {this.multipleSelection = val;console.log(this.multipleSelection)},
brandShow(row) {// 获取数据this.brandSelect = row;console.log(this.book);// 弹出窗口this.dialog2Visible = true;console.log(this.dialog2Visible);this.selectAll();
},update(){var _this = this;axios({method:"post",url:"http://localhost:8080/curriculumDesign/Book/updateById",data:_this.brandSelect //这是提交的表单数据}).then(function (resp){//这里是success数据if(resp.data == "success"){//添加成功_this.dialog2Visible = false;console.log("修改成功！");//重新查询数据进行显示_this.selectAll();_this.$message({message: '恭喜你，修改成功',type: 'success'});}else{_this.$message.error('修改失败');}})},// 查询方法onSubmit() {axios({method:"post",url:"http://localhost:8080/curriculumDesign/Book/selectByPageAndCondition?currentPage="+this.currentPage+"&pageSize="+this.pageSize,data:this.book
}).then((resp) => {//设置表格数据this.tableData = resp.data.rows; // {rows:[],totalCount:100}//设置总记录数this.totalCount = resp.data.totalCount;
})},// 添加数据addBrand(){var _this = this;// 发送ajax请求，添加数据axios({method:"post",url:"http://localhost:8080/curriculumDesign/Book/add",data:_this.book}).then(function (resp) {//响应数据的处理逻辑if(resp.data == "success"){//添加成功//关闭窗口_this.dialogVisible = false;// 重新查询数据_this.selectAll();// 弹出消息提示_this.$message({message: '恭喜你，添加成功',type: 'success'});}})},deleteByIds(){// 弹出确认提示框this.$confirm('此操作将删除该数据, 是否继续?', '提示', {confirmButtonText: '确定',cancelButtonText: '取消',type: 'warning'}).then(() => {//用户点击确认按钮//1. 创建id数组 [1,2,3], 从 this.multipleSelection 获取即可for (let i = 0; i < this.multipleSelection.length; i++) {let selectionElement = this.multipleSelection[i];this.selectedIds[i] = selectionElement.id;}//2. 发送AJAX请求var _this = this;// 发送ajax请求，添加数据axios({method:"post",url:"http://localhost:8080/curriculumDesign/Book/deleteByIds",data:_this.selectedIds}).then(function (resp) {if(resp.data == "success"){//删除成功// 重新查询数据_this.selectAll();// 弹出消息提示_this.$message({message: '恭喜你，删除成功',type: 'success'});}})}).catch(() => {//用户点击取消按钮this.$message({type: 'info',message: '已取消删除'});});
},//分页handleSizeChange(val) {this.pageSize  = val;this.selectAll();},handleCurrentChange(val) {this.currentPage  = val;this.selectAll();}},data() {return {// 当前页码// 每页显示的条数pageSize:5,// 总记录数totalCount:100,// 当前页码currentPage: 1,// 添加数据对话框是否展示的标记dialogVisible: false,dialog2Visible: false,
<!--                Integer id;-->
<!--    String number;-->
<!--    -->
<!--    String bookName ;-->
<!--    String writer ;-->
<!--    String user ;-->
<!--    Integer state ;-->book:{state:'',bookName:'',user:'',writer:'',number:"",id:""},brandSelect:{state:'',bookName:'',user:'',writer:'',number:"",id:""},// 品牌模型数据brand: {status: '',brandName: '',companyName: '',id:"",ordered:"",description:""},// 复选框选中数据集合multipleSelection: [],selectedIds:[],// 表格数据tableData: [{number:"ccsu123",bookName: '华为',writer: '老人与海',state: '1',user:"唐涛",id:'1'}]}}})</script></body>
</html>


# 总结
以上就是全部代码了，做起来并不复杂，一两天就能做完，在熟练的情况下不到一天就能弄完。
页面如下![页面图![在这里插入图片描述](https://img-blog.csdnimg.cn/32a148257ba0445bb2ff71a455e2561e.png#pic_center)

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文章目录

前言