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struts2：JSON在struts中的应用（JSP页面中将对象转换为JSON字符串提交、JSP页面中获取后台Response返回的JSON对象）详解编程语言

2023-06-13 09:20:23 时间

由JSON格式字符串创建，转换成JavaScript的Object对象；由JSON格式字符串创建，转换成JavaScript的List或数组链表对象。

更多关于JSON的信息，请参考：JSON概述及其在JavaScript与Java中的应用（整理）

1. JSP页面中将对象转换为JSON字符串提交 1.1 创建JSP文件（convertObject2Json.jsp）

 %@ page language="java" import="java.util.*" pageEncoding="utf-8" % 

 !DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" 

 html 

 head 

 meta http-equiv="Content-Type" content="text/html; charset=utf-8" 

 script type="text/javascript" src="../../js/json2.js" 

 /script 

 script type="text/javascript" 

 function ajaxTransferText(){ 

 var BigText = document.getElementById("BigText").value; 

 var ajaxTransferObjectRef = new ajaxTransferObject("张三", "密码11", 10, BigText); 

 var JSONString = JSON.stringify(ajaxTransferObjectRef); 

 if (window.ActiveXObject) { 

 myAjaxObject = new ActiveXObject("Microsoft.XMLHTTP"); 

 else { 

 myAjaxObject = new XMLHttpRequest(); 

 var urlString = "jsonString=" + JSONString; 

 alert(urlString); 

 myAjaxObject.open("POST", "postJson.action"+"?timestamp=" + new Date().getTime(), true); 

 myAjaxObject.setRequestHeader("Content-Type", "application/x-www-form-urlencoded"); 

 myAjaxObject.send(urlString); 

 function ajaxTransferObject(username, password, age, BigText){ 

 this.username = username; 

 this.password = password; 

 this.age = age; 

 this.BigText = BigText; 

 /script 

 /head 

 body 

 textarea name="textarea" id="BigText" cols="45" rows="5" 需要提交的信息主体... /textarea 

 br/ 

 input type="button" value="提交试试" onclick="ajaxTransferText()"/ 

 /body 

 /html

1.2 创建后台处理Action类

package com.clzhang.ssh.demo6; 

import net.sf.json.JSONObject; 

import com.opensymphony.xwork2.ActionSupport; 

 * 获取前台提交的JSON数据 

 * @author Administrator 

public class PostJSONAction extends ActionSupport { 

 public static final long serialVersionUID = 1; 

 private String jsonString; 

 public String getJsonString() { 

 return jsonString; 

 public void setJsonString(String jsonString) { 

 this.jsonString = jsonString; 

 public String execute() { 

 System.out.println(jsonString); 

 JSONObject json = JSONObject.fromObject(jsonString); 

 System.out.println("username=" + json.get("username")); 

 System.out.println("username=" + json.get("password")); 

 System.out.println("username=" + json.get("age")); 

 System.out.println("username=" + json.get("BigText")); 

 return null; 

}

1.3 修改配置文件struts.xml

 action name="postJson" 

 /action

1.4 测试

打开IE，输入地址：http://127.0.0.1:8080/st/ssh/demo6/convertObject2Json.jsp

结果如下：

确定后，后台显示：

2. JSP页面获取后台Response返回的JSON对象 2.1 创建JSP文件（getJsonFromResp.jsp）

struts2：JSON在struts中的应用（JSP页面中将对象转换为JSON字符串提交、JSP页面中获取后台Response返回的JSON对象）详解编程语言

 %@ page language="java" import="java.util.*" pageEncoding="utf-8" % 

 !DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" 

 html 

 head 

 meta http-equiv="Content-Type" content="text/html; charset=utf-8" 

 script type="text/javascript" src="../../js/json2.js" 

 /script 

 script type="text/javascript" 

 var myAjaxObject; 

 //在List中存字符串 

 function getListString(){ 

 if (window.ActiveXObject) { 

 myAjaxObject = new ActiveXObject("Microsoft.XMLHTTP"); 

 else { 

 myAjaxObject = new XMLHttpRequest(); 

 myAjaxObject.open("GET", "getJson!listString.action?date=" + new Date().getTime(), true); 

 myAjaxObject.onreadystatechange = retrunListString; 

 myAjaxObject.send(); 

 function retrunListString(){ 

 if (myAjaxObject.readyState == 4) { 

 if (myAjaxObject.status == 200) { 

 var returnJSONString = myAjaxObject.responseText; 

 var returnJSON = JSON.parse(returnJSONString); 

 var showString = ""; 

 for (var i = 0; i returnJSON.length; i++) { 

 showString = showString + returnJSON[i] + " "; 

 alert(showString); 

 //在List中存Bean 

 function getListBean(){ 

 if (window.ActiveXObject) { 

 myAjaxObject = new ActiveXObject("Microsoft.XMLHTTP"); 

 else { 

 myAjaxObject = new XMLHttpRequest(); 

 myAjaxObject.open("GET", "getJson!listBean.action?date=" + new Date().getTime(), true); 

 myAjaxObject.onreadystatechange = retrunListBean; 

 myAjaxObject.send(); 

 function retrunListBean(){ 

 if (myAjaxObject.readyState == 4) { 

 if (myAjaxObject.status == 200) { 

 var returnJSONString = myAjaxObject.responseText; 

 var returnJSON = JSON.parse(returnJSONString); 

 var showString = ""; 

 for (var i = 0; i returnJSON.length; i++) { 

 showString = showString + returnJSON[i].username + " " + returnJSON[i].password + " " + returnJSON[i].age + " " + returnJSON[i].createDate + "/n"; 

 alert(showString); 

 //在Map中存字符串 

 function getMapString(){ 

 if (window.ActiveXObject) { 

 myAjaxObject = new ActiveXObject("Microsoft.XMLHTTP"); 

 else { 

 myAjaxObject = new XMLHttpRequest(); 

 myAjaxObject.open("GET", "getJson!mapString.action?date=" + new Date().getTime(), true); 

 myAjaxObject.onreadystatechange = retrunMapString; 

 myAjaxObject.send(); 

 function retrunMapString(){ 

 if (myAjaxObject.readyState == 4) { 

 if (myAjaxObject.status == 200) { 

 var returnJSONString = myAjaxObject.responseText; 

 var returnJSON = JSON.parse(returnJSONString); 

 var showString = ""; 

 for (var i in returnJSON[0]) { 

 showString = showString + "key=" + i + " value=" + returnJSON[0][i] + "/n"; 

 alert(showString); 

 //在Map中存Bean 

 function getMapBean(){ 

 if (window.ActiveXObject) { 

 myAjaxObject = new ActiveXObject("Microsoft.XMLHTTP"); 

 else { 

 myAjaxObject = new XMLHttpRequest(); 

 myAjaxObject.open("GET", "getJson!mapBean.action?date=" + new Date().getTime(), true); 

 myAjaxObject.onreadystatechange = retrunMapBean; 

 myAjaxObject.send(); 

 function retrunMapBean(){ 

 if (myAjaxObject.readyState == 4) { 

 if (myAjaxObject.status == 200) { 

 var returnJSONString = myAjaxObject.responseText; 

 var returnJSON = JSON.parse(returnJSONString); 

 var showString = ""; 

 for (var i in returnJSON[0]) { 

 showString = showString + "key=" + i + " username=" + returnJSON[0][i].username + " password=" + returnJSON[0][i].password + " age=" + returnJSON[0][i].age + " createDate=" + returnJSON[0][i].createDate + "/n"; 

 alert(showString); 

 /script 

 /head 

 body 

 input type="button" value="返回List中存String类型的JSON" onclick="getListString()"/ 

 br/ 

 br/ 

 input type="button" value="返回List中存Bean类型的JSON" onclick="getListBean()"/ 

 br/ 

 br/ 

 input type="button" value="返回Map中存String类型的JSON" onclick="getMapString()"/ 

 br/ 

 br/ 

 input type="button" value="返回Map中存Bean类型的JSON" onclick="getMapBean()"/ 

 br/ 

 /body 

 /html

2.2 创建后台处理Action类

package com.clzhang.ssh.demo6; 

import java.io.IOException; 

import java.text.SimpleDateFormat; 

import java.util.*; 

import net.sf.json.JSONArray; 

import org.apache.struts2.ServletActionContext; 

import com.opensymphony.xwork2.ActionSupport; 

 * 返回给前台JSON数据，以四种方式 

 * @author Administrator 

public class ReturnJSONAction extends ActionSupport { 

 public static final long serialVersionUID = 1; 

 private List String lstString = new ArrayList String (); 

 public ReturnJSONAction() { 

 lstString.add("你今天吃了吗？"); 

 lstString.add("吃了多吃点"); 

 lstString.add("没吃回家吃去"); 

 lstString.add("好好学习"); 

 lstString.add("天天向上"); 

 public String listString() throws IOException { 

 JSONArray json = JSONArray.fromObject(lstString); 

 System.out.println(json.toString()); 

 ServletActionContext.getResponse().setContentType("text/html"); 

 ServletActionContext.getResponse().setCharacterEncoding("utf-8"); 

 ServletActionContext.getResponse().getWriter().printf(json.toString()); 

 ServletActionContext.getResponse().getWriter().flush(); 

 ServletActionContext.getResponse().getWriter().close(); 

 return null; 

 public String listBean() throws IOException { 

 List UserInfo listBean = new ArrayList UserInfo (); 

 for(String str: lstString) { 

 UserInfo userInfo1 = new UserInfo(); 

 userInfo1.setUsername(str); 

 userInfo1.setPassword("P" + Math.random()); 

 userInfo1.setAge((int)(Math.random()*10)); 

 userInfo1.setCreateDate(new SimpleDateFormat("yyyy-MM-dd hh-mm-ss") 

 .format(new Date())); 

 listBean.add(userInfo1); 

 JSONArray json = JSONArray.fromObject(listBean); 

 System.out.println(json.toString()); 

 ServletActionContext.getResponse().setContentType("text/html"); 

 ServletActionContext.getResponse().setCharacterEncoding("utf-8"); 

 ServletActionContext.getResponse().getWriter().printf(json.toString()); 

 ServletActionContext.getResponse().getWriter().flush(); 

 ServletActionContext.getResponse().getWriter().close(); 

 return null; 

 public String mapString() throws Exception { 

 LinkedHashMap String, String mapString = new LinkedHashMap String, String (); 

 int count = 1; 

 for(String str: lstString) { 

 mapString.put(""+count++, str+count); 

 JSONArray json = JSONArray.fromObject(mapString); 

 System.out.println(json.toString()); 

 ServletActionContext.getResponse().setContentType("text/html"); 

 ServletActionContext.getResponse().setCharacterEncoding("utf-8"); 

 ServletActionContext.getResponse().getWriter().printf(json.toString()); 

 ServletActionContext.getResponse().getWriter().flush(); 

 ServletActionContext.getResponse().getWriter().close(); 

 return null; 

 public String mapBean() throws Exception { 

 LinkedHashMap String, UserInfo mapString = new LinkedHashMap String, UserInfo (); 

 int count = 1; 

 for(String str: lstString) { 

 UserInfo userInfo1 = new UserInfo(); 

 userInfo1.setUsername(str); 

 userInfo1.setPassword("P" + Math.random()); 

 userInfo1.setAge((int)(Math.random()*10)); 

 userInfo1.setCreateDate(new SimpleDateFormat("yyyy-MM-dd hh-mm-ss") 

 .format(new Date())); 

 mapString.put(""+count++, userInfo1); 

 JSONArray json = JSONArray.fromObject(mapString); 

 System.out.println(json.toString()); 

 ServletActionContext.getResponse().setContentType("text/html"); 

 ServletActionContext.getResponse().setCharacterEncoding("utf-8"); 

 ServletActionContext.getResponse().getWriter().printf(json.toString()); 

 ServletActionContext.getResponse().getWriter().flush(); 

 ServletActionContext.getResponse().getWriter().close(); 

 return null; 

 public String execute() throws IOException { 

 return null; 

}

2.3 修改配置文件struts.xml

 action name="getJson" /action

2.4 测试

打开IE，输入地址：http://127.0.0.1:8080/st/ssh/demo6/getJsonFromResp.jsp

2.4.1 按下“返回List中存String类型的JSON”按钮

2.4.2 按下“返回List中存Bean类型的JSON”按钮

2.4.3 按下“返回Map中存String类型的JSON”按钮

2.4.4 按下“返回Map中存Bean类型的JSON”按钮

原创文章，作者：ItWorker，如若转载，请注明出处：https://blog.ytso.com/7969.html

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struts2：JSON在struts中的应用（JSP页面中将对象转换为JSON字符串提交、JSP页面中获取后台Response返回的JSON对象）详解编程语言

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