Java---Ajax在Struts2框架的应用实例

Ajax 是一种在无需重新加载整个网页的情况下，能够更新部分网页的技术。

很久没有动过ajax了,趁此机会复习一下,写一个简单的例子

一.项目结构:

　　　　

 

二.需要的jar包

　　

 

 

三.具体代码:

　　1.web.xml

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>Struts2display-name>
  <filter>
    <filter-name>struts2filter-name>
    <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilterfilter-class>
  filter>
  <filter-mapping>
    <filter-name>struts2filter-name>
    <url-pattern>/*url-pattern>
  filter-mapping>
  <welcome-file-list>
    <welcome-file>index.jspwelcome-file>
  welcome-file-list>
web-app>

　　 2.Action

　　　　UserLoginAction.java

 

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";
    }

}

　　　　AjaxAction.java

　　　　

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 map = new HashMap();
            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;
    }

}

 

　　3.struts.xml

　　

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>
    
    <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.jspresult>
            <result name="error">/error.jspresult>
            
        action>
        
        <action name="executeAjax" method="executeAjax" class="Action.AjaxAction">
            <result name="fail">result>
            
            <result type="json">
                <param name="root">resultparam>
            result>
        action>
        
    package>
struts>

 

　　4.jsp

　　index.jsp

　　

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
//EN" "http://www.w3.org/TR/html4/loose.dtd">







    Please enter your account number and password
    

        account number：

        password：
 <input
            type="submit" value="login" />
    

 

　　success.jsp

　　

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>







    ====>Login successfully！

    account number：${request.username}

    password：${request.password}

    

        
录入数据
        

        

            for="name">姓名：
            for="age">年龄：
            for="position">职务：
            class="btn" value="提交结果"/>
        
        

        
显示结果
        

        

            
姓名：赞无数据
            
class="li_layout">年龄：暂无数据
            
class="li_layout">职务：暂无数据
        
    
    

    
    
    

 

　　error.jsp

 　　

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>







Login failed

代码上重要的地方都会注释,不明白的可以评论.

源码下载: https://pan.baidu.com/s/1jIAarKM 密码: exgk