续上篇，改用struts2实现JQuery的ajax异步请求

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前面的两篇因为是在csdn文本上编写的，可能出现很多错误，这次在markdown上编写，应该错误会少很多，然后这次ajax请求也从上一次简单的入门$.post方法换成了$.ajax方法，剩下改动就是删除了servlet文件，加入struts2框架
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1.导包（包括上一次GSON、Hibernate的包）

2.编写我们的action类，可以把上一次的servlet删了，创建一个新的类->继承ActionSupport类->组合键shift+alt+s->选择Override/Implement Methods ->找到execute方法->确定。

import java.util.List;import org.apache.struts2.ServletActionContext;import com.google.gson.Gson;import com.opensymphony.xwork2.ActionSupport;import xxx.xxx.xxx.service.StrutsSearchService;public class AjaxStruts2Hibernate extends ActionSupport{    private StrutsSearchService ss = new StrutsSearchService();    // 1.使用属性驱动获得页面传来的参数，要为属性创建getter和setter方法    private String content;    public String getContent() {        return content;    }    public void setContent(String content) {        this.content = content;    }    @Override    public String execute() throws Exception {        System.out.println(content);        // 2.调用service方法进行模糊查询        List<String> list = ss.SearchHname(content);        System.out.println("action:"+list);        // 3.将接受结果list转化成json格式的字符串返回        Gson gson = new Gson();        String json = gson.toJson(list);        // 4.把json字符串返回到index.jsp页面        ServletActionContext.getResponse().getWriter().write(json);        //这里因为不需要跳转到新页面，返回null        return null;    }}

3.在src下新建我们的struts.xml文件，然后配置

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE struts PUBLIC    "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"    "http://struts.apache.org/dtds/struts-2.3.dtd">    <struts>        <!-- 这个是国际化编码，处理乱码的，我们开发可以不写 -->        <constant name="struts.i18n.encoding" value="UTF-8"></constant>        <!-- 这里是开发者模式，可以支持reload，即我们改写代码不用重启服务器就可以重新编译 -->        <constant name="struts.devMode" value="true"></constant>        <!-- name随便取，namespace是我们访问action的命名空间，extends必须继承struts-default，否则无法享用struts2功能 -->        <package name="demo" namespace="/" extends="struts-default">        <!-- 这里是配置action的，name就是我们后面用于访问路径的名字，class填写action完整类名，method是指定将引用该类下的哪个方法 -->            <action name="AjaxStruts2Hibernate" class="xxx.xxx.xxx.action.AjaxStruts2Hibernate" method="execute">                <!-- 如果在action类中return "success"，那么将转发到/inde.jsp中，                还可以加入type属性，指定redirect重定向，指定chain转发到action，                指定redirectAction重定向到action等                 -->                <result name="success">/index.jsp</result>                <!-- <result name="error" type="redirectAction">                    <param name="actionName">errorAction</param>                    <param name="namespace">/error</param>                </result> -->            </action>        </package>    </struts>

4.在web.xml中加入sturts2核心过滤器

<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">  <display-name>ajax_backstage3</display-name>  <welcome-file-list>    <welcome-file>index.html</welcome-file>    <welcome-file>index.htm</welcome-file>    <welcome-file>index.jsp</welcome-file>    <welcome-file>default.html</welcome-file>    <welcome-file>default.htm</welcome-file>    <welcome-file>default.jsp</welcome-file>  </welcome-file-list>  <filter>    <filter-name>struts2</filter-name>    <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>  </filter>  <filter-mapping>    <filter-name>struts2</filter-name>    <url-pattern>/*</url-pattern>  </filter-mapping> </web-app>

5.大功告成，剩下只用把上一次的service类该一下名字就行了
service类：

import java.util.List;import org.hibernate.Session;import org.hibernate.Transaction;import xxx.xxx.xxx.dao.SearchHibernateDao;import xxx.xxx.xxx.utils.HibernateUtils;public class StrutsSearchService {    public List<String> SearchHname(String content) {        // 管理事务        Session session = HibernateUtils.getCurrentSession();        Transaction tx = session.beginTransaction();        //调用dao层查询方法        SearchHibernateDao ssd = new SearchHibernateDao();        List<String> list = ssd.searchHname(content);        System.out.println("service"+list);        tx.commit();        return list;    }}

dao类：

import java.sql.SQLException;import java.util.ArrayList;import java.util.List;import xxx.xxx.xxx.utils.DataBase;public class SearchDao extends DataBase {    public List<String> search(String content) throws SQLException {        // TODO Auto-generated method stub        List<String> list = new ArrayList<String>();        String sql = "select * from cst_linkman where lkm_name like '%"+content+"%'" ;        rs = commonQuery(sql);        while(rs.next()){            list.add(rs.getString("lkm_name"));        }        return list;    }}

HibernateUtils：

import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.cfg.Configuration;public class HibernateUtils {    private static SessionFactory sf;    static{        Configuration conf = new Configuration().configure();        sf = conf.buildSessionFactory();    }    public static Session getOpenSession(){        Session session = sf.openSession();        return session;    }    public static Session getCurrentSession(){        Session session = sf.getCurrentSession();        return session;    }}

index.jsp：

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><%@ taglib prefix="s" uri="/struts-tags" %><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Insert title here</title></head><script type="text/javascript" src="JS/jquery-1.11.0.js"></script><script type="text/javascript">//为搜索绑定聚焦事件$(function(){    $("#search").keyup(function(){        var content = $(this).val();        var returnStr = "";        $.ajax({            type:"POST",            url:"/ajax_backstage4/AjaxStruts2Hibernate",            contentType:"application/x-www-form-urlencoded",            data:{"content":content},            dataType:"json",            success:function(data){                //请求正确后的操作                if(data.length>0){                    for(var i=0;i<data.length;i++){                        returnStr += "<div id='div' style='padding:5px;cursor:pointer' onmouseover='overFn(this)' onmouseout='outFn(this)' onclick='clickFn(this)'>"+data[i]+"</div>";//                    }                     $("#div").html(returnStr);                    $("#div").css("display","block");                }else{                    $("#div").css("display","none");                }            },            error:function(result){                //请求失败后的操作            }        });     });    $("#search").blur(function(){        $("#div").css("display","none");    });})//绑定按钮事件$(function(){    $("#button").click(function(){        var sub = $("#search").val();        $.ajax({            type:"POST",            url:"/ajax_backstage4/AjaxStruts2Hibernate",            contentType:"application/json",            data:JSON.stringify({"sub":sub}),            dataType:"json",            success:function(result){                //请求正确后的操作            },            error:function(result){                //请求失败后的操作            }        });    });})//对div添加鼠标移入效果function overFn(obj){    $(obj).css("background-color","yellow");}//对div添加鼠标移出效果function outFn(obj){    $(obj).css("background-color","#F0F8FF");}//对div内容添加点击效果function clickFn(obj){    $("#search").val($(obj).html());    $("#div").css("display","none");}</script><body>      <input type="text" id="search" /><input type="button" id="button" value="按钮">    <div id="div" style="width:150px;display:none;background-color: #F0F8FF"></div>    <s:debug></s:debug></body></html>