serverlet 返回json

1.web.xml

 <servlet><servlet-name>serverlet名</servlet-name><servlet-class>项目类路径</servlet-class></servlet><servlet-mapping><servlet-name><span style="font-family: Arial, Helvetica, sans-serif; font-size: 12px;">serverlet名</span><span style="font-size: 12px; font-family: Arial, Helvetica, sans-serif;"></servlet-name></span>
<url-pattern>/请求路径</url-pattern></servlet-mapping>

2.java

package com.pul.sam.area;import java.io.IOException;
import java.io.PrintWriter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import net.sf.json.JSONObject;import org.hibernate.SessionFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.orm.hibernate3.HibernateTemplate;
import org.springframework.orm.hibernate3.HibernateTransactionManager;
import org.springframework.transaction.TransactionDefinition;
import org.springframework.transaction.TransactionStatus;
import org.springframework.transaction.support.DefaultTransactionDefinition;
import org.springframework.web.context.support.WebApplicationContextUtils;public class AreaQuery extends HttpServlet{private static final long serialVersionUID = 1L;protected void doGet(HttpServletRequest req, HttpServletResponse res)throws ServletException, IOException {this.requestManage(req,res);;}protected void doPost(HttpServletRequest req, HttpServletResponse res)throws ServletException, IOException {this.requestManage(req,res);}/*** 处理请求* @throws IOException */private void requestManage(HttpServletRequest req, HttpServletResponse res) throws IOException{//配置编码类型res.setContentType("text/html;charset=UTF-8;pageEncoding=UTF-8");  //控制浏览器的编码行为res.setCharacterEncoding("UTF-8");//目的是用于response.getWriter()输出的字符流的乱码问题，如果是response.getOutputStream()是不需要此种解决方案的；因为这句话的意思是为了将response对象中的数据以UTF-8解码后发向浏览器；res.setHeader("content-type","text/html;charset=UTF-8"); req.setCharacterEncoding("UTF-8");    String type = req.getParameter("type");switch (type) {case "prov":this.queryProv(req, res);break;case "city":this.queryCity(req, res);break;case "area":this.queryArea(req, res);break;default:break;}}/*** 省份查询* @throws IOException */@SuppressWarnings("rawtypes")private void queryProv(HttpServletRequest req, HttpServletResponse res) throws IOException {System.out.println("111111111");//配置编码类型res.setContentType("text/json;charset=UTF-8;pageEncoding=UTF-8");  //控制浏览器的编码行为res.setCharacterEncoding("UTF-8");//目的是用于response.getWriter()输出的字符流的乱码问题，如果是response.getOutputStream()是不需要此种解决方案的；因为这句话的意思是为了将response对象中的数据以UTF-8解码后发向浏览器；res.setHeader("content-type","text/json;charset=UTF-8");  req.setCharacterEncoding("UTF-8");        PrintWriter out = res.getWriter();     // 配置与数据库链接的属性ServletContext sc = req.getSession().getServletContext();ApplicationContext ac = WebApplicationContextUtils.getWebApplicationContext(sc);SessionFactory sessionFactory=(SessionFactory) ac.getBean("sessionFactory");//创建工厂HibernateTransactionManager htm = new HibernateTransactionManager(sessionFactory);DefaultTransactionDefinition def = new DefaultTransactionDefinition();def.setReadOnly(false);def.setPropagationBehavior(TransactionDefinition.PROPAGATION_REQUIRED);TransactionStatus status = htm.getTransaction(def);HibernateTemplate ht=new HibernateTemplate(sessionFactory);//增删改查的模版     //查询数据库String hql = "select distinct _t1.provCode,_t1.prov from TArea _t1";List list = ht.find(hql);htm.commit(status);  //真正提交到后台数据库Map<String, Object> map = new HashMap<String, Object>();map.put("result", list);JSONObject json = JSONObject.fromObject(map);out.print(json);out.close();}/*** 城市查询* @throws IOException */@SuppressWarnings("rawtypes")private List queryCity(HttpServletRequest req, HttpServletResponse res) throws IOException {//配置编码类型res.setContentType("text/json;charset=UTF-8;pageEncoding=UTF-8");  //控制浏览器的编码行为res.setCharacterEncoding("UTF-8");//目的是用于response.getWriter()输出的字符流的乱码问题，如果是response.getOutputStream()是不需要此种解决方案的；因为这句话的意思是为了将response对象中的数据以UTF-8解码后发向浏览器；res.setHeader("content-type","text/json;charset=UTF-8"); req.setCharacterEncoding("UTF-8");        PrintWriter out = res.getWriter();     // 配置与数据库链接的属性ServletContext sc = req.getSession().getServletContext();ApplicationContext ac = WebApplicationContextUtils.getWebApplicationContext(sc);SessionFactory sessionFactory=(SessionFactory) ac.getBean("sessionFactory");//创建工厂HibernateTransactionManager htm = new HibernateTransactionManager(sessionFactory);DefaultTransactionDefinition def = new DefaultTransactionDefinition();def.setReadOnly(false);def.setPropagationBehavior(TransactionDefinition.PROPAGATION_REQUIRED);TransactionStatus status = htm.getTransaction(def);HibernateTemplate ht=new HibernateTemplate(sessionFactory);//增删改查的模版     //查询数据库String hql = "select distinct _t1.provCode,_t1.prov from TArea _t1";List list = ht.find(hql);htm.commit(status);  //真正提交到后台数据库Map<String, Object> map = new HashMap<String, Object>();map.put("result", list);JSONObject json = JSONObject.fromObject(map);out.print(json);out.close();      return list;}/*** 区查询* @throws IOException */@SuppressWarnings("rawtypes")private List queryArea(HttpServletRequest req, HttpServletResponse res) throws IOException {System.out.println("111111111");//配置编码类型res.setContentType("text/json;charset=UTF-8;pageEncoding=UTF-8");  //控制浏览器的编码行为res.setCharacterEncoding("UTF-8");//目的是用于response.getWriter()输出的字符流的乱码问题，如果是response.getOutputStream()是不需要此种解决方案的；因为这句话的意思是为了将response对象中的数据以UTF-8解码后发向浏览器；res.setHeader("content-type","text/json;charset=UTF-8");  req.setCharacterEncoding("UTF-8");        PrintWriter out = res.getWriter();     // 配置与数据库链接的属性ServletContext sc = req.getSession().getServletContext();ApplicationContext ac = WebApplicationContextUtils.getWebApplicationContext(sc);SessionFactory sessionFactory=(SessionFactory) ac.getBean("sessionFactory");//创建工厂HibernateTransactionManager htm = new HibernateTransactionManager(sessionFactory);DefaultTransactionDefinition def = new DefaultTransactionDefinition();def.setReadOnly(false);def.setPropagationBehavior(TransactionDefinition.PROPAGATION_REQUIRED);TransactionStatus status = htm.getTransaction(def);HibernateTemplate ht=new HibernateTemplate(sessionFactory);//增删改查的模版     //查询数据库String hql = "select distinct _t1.provCode,_t1.prov from TArea _t1";List list = ht.find(hql);htm.commit(status);  //真正提交到后台数据库Map<String, Object> map = new HashMap<String, Object>();map.put("result", list);JSONObject json = JSONObject.fromObject(map);out.print(json);out.close();      return list;}
}

3.js

 $.ajax({    type:'post',    url:'/logistic/queryArea?type=prov',    cache:false,    dataType:'json',    success:function(data){
//           alert("success");console.log(data);console.log(eval(data));//前台json字符串转换json数据},    error:function(e){console.log("失败");console.log(e);}    });

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