專案開發中，很多時候需要使用ajax+json來獲取伺服器資料， 同時伺服器也會採用返回json資料以達到跨平臺訪問的形式：
我們利用sturts2 完成一個demo，自行搭建struts2的環境：
1、實體類：

  import java.util.Date;


public class Role {

    private int id;
    private String name;
    private String createDate;

    public Role(){}

    public Role(int id, String name, String createDate) {
        super
 
();
        this.id = id;
        this.name = name;
        this.createDate = createDate;
    }
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this
 
.name = name;
    }

    public String getCreateDate() {
        return createDate;
    }

    public void setCreateDate(String createDate) {
        this.createDate = createDate;
    }




}

2、struts2 action實現

package com.xingxue.action;

import java.io.IOException;
import java.io.PrintWriter;
import java.util
 
.Date;

import javax.servlet.http.HttpServletResponse;

import net.sf.json.JSONObject;

import org.apache.struts2.ServletActionContext;

import com.xingxue.model.Role;

public class RoleAction {

    public String getData() {

        HttpServletResponse response = ServletActionContext.getResponse();
        try {
            PrintWriter out = response.getWriter();

            Role role = new Role(1,"財務",new Date().toString());

            JSONObject jsonStr = JSONObject.fromObject(role);
            String str = jsonStr.toString();
            out.print(str);
            out.flush();
            out.close();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        return null;
    }

}

3、js獲取資料實現：

package com.xingxue.action;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Date;

import javax.servlet.http.HttpServletResponse;

import net.sf.json.JSONObject;

import org.apache.struts2.ServletActionContext;

import com.xingxue.model.Role;

public class RoleAction {

    public String getData() {

        HttpServletResponse response = ServletActionContext.getResponse();
        try {
            PrintWriter out = response.getWriter();

            Role role = new Role(1,"財務",new Date().toString());

            JSONObject jsonStr = JSONObject.fromObject(role);
            String str = jsonStr.toString();
            out.print(str);
            out.flush();
            out.close();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        return null;
    }

}