Java---Ajax在Struts2框架的应用实例

<?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_3_0.xsd" id="WebApp_ID" version="3.0">
  <display-name>Struts2</display-name>
  <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>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>

package Action;

import com.opensymphony.xwork2.ActionSupport;

/** 
* @author user:liuadmin
* @version date：2017年12月8日 上午6:54:00 
* 
*/

public class UserLoginAction extends ActionSupport {

    private static final long serialVersionUID = 1L;
    private String username;
    private String password;

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    /**
     * userlogin
     * 
     * @return SUCCESS
     */
    public String login() {
        System.out.println("execute!!!");
        if ("admin".equals(this.username) && "123".equals(this.password))
            return "success";
        else if (password == null && username == null)
            return "error";
        else
            return "error";
    }

}

package Action;

import java.util.HashMap;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import net.sf.json.JSONObject;

import org.apache.struts2.interceptor.ServletRequestAware;

import com.opensymphony.xwork2.ActionSupport;

/** 
* @author user:liuadmin
* @version date：2017年12月8日 上午6:56:00 
* 
*/

public class AjaxAction extends ActionSupport implements ServletRequestAware {
    private static final long serialVersionUID = 1L;

    private HttpServletRequest request;
    private String result;

    public void setServletRequest(HttpServletRequest arg0) {
        this.request = arg0;
    }

    public String getResult() {
        return result;
    }

    public void setResult(String result) {
        this.result = result;
    }

    /**
     * 处理ajax请求
     * 
     * @return SUCCESS
     */
    public String executeAjax() {
        try {
            // 获取数据
            String name = request.getParameter("name");
            int age = Integer.parseInt(request.getParameter("age"));
            String position = request.getParameter("position");

            // 将数据存储在map里，再转换成json类型数据，也可以自己手动构造json类型数据
            Map<String, Object> map = new HashMap<String, Object>();
            map.put("name", name);
            map.put("age", age);
            map.put("position", position);

            JSONObject json = JSONObject.fromObject(map);// 将map对象转换成json类型数据
            result = json.toString();// 给result赋值，传递给页面
        } catch (Exception e) {
            e.printStackTrace();
        }
        return SUCCESS;
    }

}

<?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>
    <!--解决乱码 -->
    <constant name="struts.i18n.encoding" value="UTF-8"></constant>
    
    <include file="struts-default.xml" />
    
    <package name="struts"  extends="struts-default,json-default">
    
        <action name="login" class="Action.UserLoginAction" method="login">
        
        
            <result name="success">/success.jsp</result>
            <result name="error">/error.jsp</result>
            
        </action>
        
        <action name="executeAjax" method="executeAjax" class="Action.AjaxAction">
            <result name="fail"></result>
            <!-- 返回json类型数据 -->
            <result type="json">
                <param name="root">result<!-- result是action中设置的变量名，也是页面需要返回的数据，该变量必须有setter和getter方法 --></param>
            </result>
        </action>
        
    </package>
</struts>

<%@ 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">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Login</title>
</head>
<body>

    Please enter your account number and password
    <form >
        account number：<input type="text" name="username" >
        password：<input type="password" name="password" >input
            type="submit" value="login" />
    </form>


</body>
</html>

<%@ 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">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Ajax+Struts2 is Demo</title>
</head>
<body >
    ====>Login successfully！<br />
    account number：${request.username}<br />
    password：${request.password}<br>
    <div >
        <h5>录入数据</h5>
        <br />
        <form action="executeAjax" method="post">
            <label for="name">姓名：</label><input type="text" name="name" />
            <label for="age">年龄：</label><input type="text" name="age" />
            <label for="position">职务：</label><input type="text" name="position" />
            <input type="button" class="btn" value="提交结果"/>
        </form>
        <br />
        <h5>显示结果</h5>
        <br />
        <ul>
            <li>姓名：<span >赞无数据</span></li>
            <li class="li_layout">年龄：<span >暂无数据</span></li>
            <li class="li_layout">职务：<span >暂无数据</span></li>
        </ul>
    </div>
    

    
    <script type="text/javascript" src="js/jquery-1.8.2.js"></script>
    <script type="text/javascript">
        
        /* 提交结果，执行ajax */
        function btn(){
            
            var $btn = $("input.btn");//获取按钮元素
            //给按钮绑定点击事件
            $btn.bind("click",function(){
                
                $.ajax({
                    type:"post",
                    url:"AjaxAction/executeAjax",//需要用来处理ajax请求的action,excuteAjax为处理的方法名，JsonAction为action名
                    data:{//设置数据源
                        name:$("input[name=name]").val(),
                        age:$("input[name=age]").val(),
                        position:$("input[name=position]").val()//这里不要加","  不然会报错，而且根本不会提示错误地方
                    },
                    dataType:"json",//设置需要返回的数据类型
                    success:function(data){
                        var d = eval("("+data+")");//将数据转换成json类型，可以把data用alert()输出出来看看到底是什么样的结构
                        //得到的d是一个形如{"key":"value","key1":"value1"}的数据类型，然后取值出来
                        
                        $("#s_name").text(""+d.name+"");
                        $("#s_age").text(""+d.age+"");
                        $("#s_position").text(""+d.position+"");
                        
                    },
                    error:function(){
                        alert("系统异常，请稍后重试！");
                    }//这里不要加","
                });
            });
        }
    
        /* 页面加载完成，绑定事件 */
        $(document).ready(function(){            
            btn();//点击提交，执行ajax
        });
    </script>
</body>
</html>

<%@ 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">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>error</title>
</head>
<body>
Login failed
</body>
</html>