ajax与servlet交互（通过JSON）,JAVA的arraylist传到前端的方法

所实现的效果：首先从前端（ajax）传参数给servlet，然后servlet经过处理，把arraylist类型的参数以JSON字符串的形式返回给前端（ajax），然后前端经过解析，把JSON字符串解析为JS数组。

直接上代码吧。

1.JSP代码(test.jsp)，需要下载jQuery，下载地址，把jQuery路径也修改一下：

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



    

    
    
        
    
    
    
        
        



    

        UserName:
        PassWord:
        提交
    

2.javabean代码（User.java）：

package com.test;

public class User {
    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;
    }
}

3.servlet代码（TestServlet.java），需要GSON.jar， 下载地址，并放在项目的WEB-INF/lib下面：

package com.test;
import java.io.IOException;
import java.io.PrintWriter;

import javax.jws.soap.SOAPBinding.Use;
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.util.ArrayList;

import com.test.User;
//import com.beans.AerialPhotographBean;
import com.google.gson.Gson;

@WebServlet("/TestServlet")
public class TestServlet extends HttpServlet {

    public TestServlet() {
        super();
    }

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        doPost(request, response);
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        response.setContentType("text/html");
        PrintWriter out = response.getWriter();
        String username=request.getParameter("username");
        String password=request.getParameter("password");

        System.out.println("UserName:"+username+";"+"PassWord:"+password);

        Gson gson=new Gson();
        ArrayList arraylistUsers = new ArrayList();
        User user1=new User();
        user1.setUsername(username);
        user1.setPassword(password);
        
        User user2=new User();
        user2.setUsername(username);
        user2.setPassword(password);
        
        arraylistUsers.add(user1);
        arraylistUsers.add(user2);


        
        String info=gson.toJson(arraylistUsers);
        System.out.println(info);
        
        out.write(info);
//        out.print("success");
//        out.flush();
//        out.close();
    }

}

运行结果图：