json在servlet与ajax之间的传递实例

java对象
这是uservo定义的源码

package VO.userVO;import PO.userPO.UserPO;public class UserVO {    private String account;//用户账户，也是用户唯一标志，登录时使用，每个用户的账户是唯一的。账户格式要求只能包含英文字母、数字，且必须以英文字母开头。    private String username;//用户名，即用户昵称，类似与qq昵称    private String password;//用户密码    private String realName;//用户真实姓名    private String mail;//邮箱    private String birth;//生日，8位，如“19970516”    private String phone;//手机号码，11位    public UserVO() {    }    public UserVO(String account, String username, String password) {        this.account=account;        this.username = username;        this.password = password;    }    public UserVO(String account, String username, String password, String realName, String mail, String birth, String phone) {        this.account=account;        this.username = username;        this.password = password;        this.realName = realName;        this.mail = mail;        this.birth = birth;        this.phone = phone;    }    public UserVO(UserPO userPO){        this.account=userPO.getAccount();        this.username = userPO.getUsername();        this.password = userPO.getPassword();        this.realName = userPO.getRealName();        this.mail = userPO.getMail();        this.birth = userPO.getBirth();        this.phone = userPO.getPhone();    }    //get and set    public String getAccount() {        return account;    }    public void setAccount(String account) {        this.account = account;    }    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;    }    public String getRealName() {        return realName;    }    public void setRealName(String realName) {        this.realName = realName;    }    public String getMail() {        return mail;    }    public void setMail(String mail) {        this.mail = mail;    }    public String getBirth() {        return birth;    }    public void setBirth(String birth) {        this.birth = birth;    }    public String getPhone() {        return phone;    }    public void setPhone(String phone) {        this.phone = phone;    }}

servlet
以下是servlet，将UserVO的ArrayList转换为json，之后response。

package Servlet.UserBlSer;import VO.userVO.UserVO;import bl.userBl.User;import org.json.JSONArray;import org.json.JSONException;import org.json.JSONObject;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.IOException;import java.io.PrintWriter;import java.util.ArrayList;public class register extends HttpServlet {    private static final long serialVersionUID = 1L;    private User user;    /**     * @see HttpServlet#HttpServlet()     */    public register(){        super();        user=new User();    }    public static void main(String[] args){        System.out.println(123);    }    /**     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)     */    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {        ArrayList<UserVO> userVOS=new ArrayList<>();        UserVO userVO1=new UserVO("111","wxf","123");        UserVO userVO2=new UserVO("222","czf","456");        UserVO userVO3=new UserVO("333","wcy","789");        userVOS.add(userVO1);        userVOS.add(userVO2);        userVOS.add(userVO3);        response.setContentType("application/json");        response.setCharacterEncoding("UTF-8");        JSONArray jsonarray = new JSONArray();        try {            for (int i = 0; i < userVOS.size(); i++) {                JSONObject jsonObject=new JSONObject();                jsonObject.put("account",userVOS.get(i).getAccount());                jsonObject.put("username",userVOS.get(i).getUsername());                jsonObject.put("password",userVOS.get(i).getPassword());                jsonarray.put(jsonObject);            }        } catch (JSONException e) {            e.printStackTrace();        }        PrintWriter pw = response.getWriter();        pw.write(jsonarray.toString());        pw.close();    }    /**     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)     */    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {        // TODO Auto-generated method stub        doGet(request, response);    }}

ajax
最后是ajax获取json数组，并显示。

function getDataPack() {    var xmlhttp;    if (window.XMLHttpRequest)    {// code for IE7+, Firefox, Chrome, Opera, Safari        xmlhttp=new XMLHttpRequest();    }    else    {// code for IE6, IE5        xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");    }    xmlhttp.onreadystatechange=function()    {        if (xmlhttp.readyState==4 && xmlhttp.status==200)        {            var result=xmlhttp.responseText;            var dataPack=eval(result);            var output="";            for(var i=0;i<dataPack.length;i++){                output=output+dataPack[i].account+" "+dataPack[i].username+" "+dataPack[i].password+"\n";            }            document.getElementById("test").innerHTML=output;        }    }    xmlhttp.open("GET","/StockHubWeb/register",true);    xmlhttp.send();}

http代码
以下是http代码，网页显示，按按钮后调用js方法，修改id为“test”的组件。

<!DOCTYPE html><html lang="en"><head>    <meta charset="UTF-8">    <title>test1</title>    <script src="js/test.js"></script></head><body><h1 id="test">初始</h1><button type="button" onclick="getDataPack()">搜索</button></body></html>

以上就是全部内容，希望对大家有所帮助！