8、使用Struts2实现异步调用机制剖析（XML与JSON方式解析）

来源：互联网发布：刷业务平台软件编辑：程序博客网时间：2024/06/07 05:37

综合使用jquery，struts2实现XML数据和JSON数据的解析

1、解析XML

一个输入提交页面getXML.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <base href="<%=basePath%>">        <title>My JSP 'getXML.jsp' starting page</title>    <meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0">    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">--><script type="text/javascript" src="scripts/jquery-1.9.1.js"></script><script type="text/javascript">function getInfo(){$.post("getXMLAction.action",{name:$("#name").val()},function(returnedData,status){var id = $(returnedData).find("id").text();var name = $(returnedData).find("name").text();var age = $(returnedData).find("age").text();var address = $(returnedData).find("address").text();var html = "<table width='60%' border='1' align='center'><tr><th>id</th><th>name</th><th>address</th><th>age</th></tr><tr align='center'><td>" + id + "</td><td>" + name + "</td><td>" + address + "</td><td>" + age + "</td></tr></table>"$("#theBody table:eq(0)").remove();$("#theBody").append(html); });}</script>  </head>    <body id="theBody">    <select id="name">    <option value="zhangsan">zhangsan</option>    <option value="lisi">lisi</option>    </select>    <input type="button" value="click" onclick="getInfo();"/>  </body></html>

一个action：

package com.cdtax.action.xml;import java.io.PrintWriter;import javax.servlet.http.HttpServletResponse;import org.apache.struts2.ServletActionContext;import org.dom4j.Document;import org.dom4j.DocumentHelper;import org.dom4j.Element;import org.dom4j.io.OutputFormat;import org.dom4j.io.XMLWriter;import com.opensymphony.xwork2.ActionSupport;public class GetXMLAction extends ActionSupport{private String name;public String getName(){return name;}public void setName(String name){this.name = name;}@Overridepublic String execute() throws Exception{Person person1 = new Person();person1.setId(1);person1.setName("zhangsan");person1.setAge(20);person1.setAddress("beijing");Person person2 = new Person();person2.setId(2);person2.setName("lisi");person2.setAge(30);person2.setAddress("shanghai");Document document = DocumentHelper.createDocument();Element rootElement = document.addElement("persons");rootElement.addComment("this is commnets");Element e = rootElement.addElement("person");Element idElement = e.addElement("id");Element nameElement = e.addElement("name");Element ageElement = e.addElement("age");Element addressElement = e.addElement("address");if("zhangsan".equals(name)){idElement.setText(person1.getId() + "");nameElement.setText(person1.getName());ageElement.setText(person1.getAge() + "");addressElement.setText(person1.getAddress());}else{idElement.setText(person2.getId() + "");nameElement.setText(person2.getName());ageElement.setText(person2.getAge() + "");addressElement.setText(person2.getAddress());}HttpServletResponse response = ServletActionContext.getResponse();response.setContentType("text/xml;charset=utf-8");response.setHeader("cache-control", "no-cache");PrintWriter out = response.getWriter();OutputFormat format = OutputFormat.createCompactFormat();format.setEncoding("utf-8");XMLWriter writer = new XMLWriter(out,format);writer.write(document);out.flush();out.close();return null;}}

配置struts.xml中的action：

<action name="getXMLAction" class="com.cdtax.action.xml.GetXMLAction"></action>

2、解析JSON

一个提交页面getJson.jsp：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <base href="<%=basePath%>">        <title>My JSP 'json.jsp' starting page</title>    <meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0">    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">--><script type="text/javascript" src="scripts/jquery-1.9.1.js"></script><script type="text/javascript">$(function(){$("#button1").click(function(){$.post("getJsonAction",{name:$("#name").val()},function(returnedData,status){var person = returnedData;var id = person.id;var name = person.name;var age = person.age;var address = person.address;var html = "<table width='60%' border='1' align='center'><tr><th>id</th><th>name</th><th>address</th><th>age</th></tr><tr align='center'><td>" + id + "</td><td>" + name + "</td><td>" + address + "</td><td>" + age + "</td></tr></table>"$("#theBody table:eq(0)").remove();$("#theBody").append(html); });});});</script>  </head>    <body id="theBody">    <select id="name">    <option value="zhangsan">zhangsan</option>    <option value="lisi">lisi</option>    </select>    <input type="button" value="ddfds" id="button1">  </body></html>

处理的action：

package com.cdtax.action.json;import java.io.PrintWriter;import javax.servlet.http.HttpServletResponse;import org.apache.struts2.ServletActionContext;import org.dom4j.io.OutputFormat;import org.dom4j.io.XMLWriter;import com.cdtax.action.xml.Person;import com.google.gson.Gson;import com.opensymphony.xwork2.ActionSupport;public class GetJsonAction extends ActionSupport{private String name;public String getName(){return name;}public void setName(String name){this.name = name;}@Overridepublic String execute() throws Exception{Person person = new Person();person.setId(1);person.setName(name);person.setAge(30);person.setAddress("shanghai");Gson gson = new Gson();String result = gson.toJson(person);//System.out.println(result);HttpServletResponse response = ServletActionContext.getResponse();response.setContentType("text/json;charset=utf-8");response.setHeader("cache-control", "no-cache");PrintWriter out = response.getWriter();out.print(result);out.flush();out.close();return null;}}

配置action，略

3、struts2提供了json插件，struts2-json-plugin-2.3.14.jar

提交页面：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <base href="<%=basePath%>">        <title>My JSP 'json.jsp' starting page</title>    <meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0">    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">--><script type="text/javascript" src="scripts/jquery-1.9.1.js"></script><script type="text/javascript">$(function(){$("#button1").click(function(){$.post("getJsonAction2.action",{name:$("#name").val()},function(returnedData,status){var person = returnedData;var id = person.id;var name = person.name;var age = person.age;var address = person.address;var html = "<table width='60%' border='1' align='center'><tr><th>id</th><th>name</th><th>address</th><th>age</th></tr><tr align='center'><td>" + id + "</td><td>" + name + "</td><td>" + address + "</td><td>" + age + "</td></tr></table>"$("#theBody table:eq(0)").remove();$("#theBody").append(html); });});});</script>  </head>    <body id="theBody">    <select id="name">    <option value="zhangsan">zhangsan</option>    <option value="lisi">lisi</option>    </select>    <input type="button" value="ddfds" id="button1">  </body></html>

一个Action：

package com.cdtax.action.json;import org.apache.struts2.json.annotations.JSON;import com.opensymphony.xwork2.ActionSupport;public class GetJsonAction2 extends ActionSupport{private String name;private int id;private int age;private String address;public String getName(){return name;}public void setName(String name){this.name = name;}public int getId(){return id;}public void setId(int id){this.id = id;}@JSON(name="myAge")public int getAge(){return age;}public void setAge(int age){this.age = age;}public String getAddress(){return address;}public void setAddress(String address){this.address = address;}@Overridepublic String execute() throws Exception{this.id = 1;this.age = 30;this.address = "shanghai";System.out.println("invoke!!!!!!!!!!!!!!!");return SUCCESS;}}

配置文件struts.xml中进行action的配置：

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN""http://struts.apache.org/dtds/struts-2.3.dtd"><struts><package name="struts2_ajax" extends="json-default"><action name="getXMLAction" class="com.cdtax.action.xml.GetXMLAction"></action><action name="getJsonAction" class="com.cdtax.action.json.GetJsonAction"></action><action name="getJsonAction2" class="com.cdtax.action.json.GetJsonAction2"><result name="success" type="json"><param name="excludeProperties">address</param></result></action></package></struts>

注意这里的package要extends的是json-default

result标签可以包含<param name="excludeProperties">address</param>，表示服务器端排除的成员变量，即这个变量数据没有在发往客户端的json数据中。在Action中，还可以使用注解来给某个变量重新命名，就是发给客户端的变量名，如

@JSON(name="myAge")
public int getAge()
{
return age;
}

在客户端，得到的就是myAge，而不是age