struts2与json、xml的综合应用 _JavaScript

struts2与json、xml的综合使用

其实，说到这个主题，总觉得没有什么必要总结。因为它与servlet的处理方式及其相似，几乎是一样的。只不过是增加增加了几行代码而已，先看一下处理代码吧。

Jsp页面采用ajax方式异步发送请求：

<%@ 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>


<title>My JSP 'ajaxAndStruts2.jsp' starting page</title>

<script type="text/javascript" src="../javascript/jquery-1.7.1.js"></script>
<script type="text/javascript">
	$(function() {
		$("#ok").click(function() {
			$.post("../getMyLover.action",{"name":$("#name").val()},function(returnData, status){
				/*如果返回结果为JSON格式的时候*/
				var data = $(returnData)[0];
				var name = data.name;
				var age = data.age;
				var sex = data.sex;
				
				/*如果返回结果为XML格式的时候*/
				/*
				var data = $(returnData);
				var name = data.find("name").text();
				var age = data.find("age").text();
				var sex = data.find("sex").text();
				*/
				$showLover = $("#showLover");
				$showLover.text("");
				$table = $("<table align = 'center' width = '80%' border = 1></table>");
				$table.append("<tr><td>name</td><td>age</td><td>sex</td><tr>");
				$table.append("<tr><td>"+name+"</td><td>"+age+"</td><td>"+sex+"</td></tr>");
				$showLover.append($table);
			},"json");//注意此处的请求内容的格式，如果为JSON则应为“json”，如果为XML则为“xml”
		});
	});
</script>
<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">
	-->

</head>

<body>
	<input type="text" id="name">
	<input type="button" id="ok" value="select">
	<div id = "showLover"></div>
</body>
</html>

?==========================---如果请求的为JSON格式的时候，服务器端的处理

方法1：需要加载struts2提供的struts2-json-plugin-2.3.1.2.jar。

此处采用的是注解的方式配置，其对应的XML配置也是蛮简单的，此处不赘述。

package com.dong.struts2;

import org.apache.struts2.convention.annotation.Action;
import org.apache.struts2.convention.annotation.ParentPackage;
import org.apache.struts2.convention.annotation.Result;
import org.apache.struts2.json.annotations.JSON;

import com.opensymphony.xwork2.ActionSupport;

//json-default是struts2-json-plugin-2.3.1.2.jar中的struts-plugin.xml中定义的包，它继承自struts-default，则我们则可以直接继承这个包
@ParentPackage("json-default")
//配置Action，此处注意的就是type必须设置为json，如果不设置则会产生错误，同时params只是提供了如何的排除某些属性
@Action(value = "getMyLover", results =
{ @Result(name = "success",type="json",params={"excludeProperties","sex"}) })
public class JsonPluginStruts2 extends ActionSupport
{
	private String name;
	private String sex;
	private int age;

	//用来设定在客户端显示的名字
	@JSON(name="myLover")
	public String getName()
	{
		return name;
	}

	public void setName(String name)
	{
		this.name = name;
	}

	public String getSex()
	{
		return sex;
	}

	public void setSex(String sex)
	{
		this.sex = sex;
	}

	public int getAge()
	{
		return age;
	}

	public void setAge(int age)
	{
		this.age = age;
	}

	@Override
	public String execute() throws Exception
	{
		if ("dongdong".equals(this.name))
		{
			this.name = "jingjing";
			this.age = 21;
			this.sex = "girl";
		}
		else if ("jingjing".equals(this.name))
		{
			this.name = "dongdong";
			this.age = 22;
			this.sex = "boy";
		}
		return SUCCESS;
	}
}

?那么这样我们就完成了服务器与客户端以JSON格式交换信息。

---------------------------------------------------处理XML

下面看服务器端处理XML的方法：

//代码比较简单，不加注释了
package com.dong.struts2;

import java.io.PrintWriter;

import javax.servlet.http.HttpServletResponse;
import javax.sql.rowset.spi.XmlWriter;

import org.apache.struts2.ServletActionContext;
import org.apache.struts2.convention.annotation.Action;
import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.XMLWriter;

import com.dong.util.Lover;
import com.opensymphony.xwork2.ActionSupport;

@Action(value = "getLover")
public class ByJsonTest extends ActionSupport
{
	private String name;
	
	public String getName()
	{
		return name;
	}
	public void setName(String name)
	{
		this.name = name;
	}
	
	@Override
	public String execute() throws Exception
	{
		Document document = DocumentHelper.createDocument();
		
		Element root = DocumentHelper.createElement("MyLover");
		
		document.setRootElement(root);
		
		Element loverName = root.addElement("name");
		Element age = root.addElement("age");
		Element sex = root.addElement("sex");
		
		Lover lover = new Lover();
		if(name.equals("dongdong"))
		{
			lover.setName("xiaojing");
			lover.setAge(21);
			lover.setSex("girl");
		}
		else if(name.equals("jingjing"))
		{
			lover.setName("dongdong");
			lover.setAge(22);
			lover.setSex("boy");
		}
		
		loverName.setText(lover.getName());
		age.setText(lover.getAge() + "");
		sex.setText(lover.getSex());
		
		HttpServletResponse response = ServletActionContext.getResponse();
		
		response.setContentType("text/xml;utf-8");
		response.setHeader("cache-control","no-cache");
		
		PrintWriter out = response.getWriter();
		
		XMLWriter write = new XMLWriter(out);
		write.write(document);
		write.flush();
		write.close();
		out.flush();
		out.close();
		//注意此处的范围值，可以为null，但是不能为success、input等
		return "none";
	}
}