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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

• 编程笔记

JSON主要创建如下两种数据对象：

  • 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" class="com.clzhang.ssh.demo6.PostJSONAction"> 
</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：

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

确定后，后台显示：

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

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

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

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" class="com.clzhang.ssh.demo6.ReturnJSONAction">         </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

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

2.4.2 按下“返回List中存Bean类型的JSON”按钮

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

2.4.3 按下“返回Map中存String类型的JSON”按钮

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

2.4.4 按下“返回Map中存Bean类型的JSON”按钮

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

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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