strut2服务器与android交互数据

libs如图：

web.xml:

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee     http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
	<!-- 定义Struts2的核心控制器：FilterDispatcher -->
	<filter>
		<!-- 定义核心Filter的名称 -->
		<filter-name>struts2</filter-name>
		<!-- 定义Filter的实现类 -->
		<filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
	</filter>
	<filter-mapping>
		<filter-name>struts2</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>
	<welcome-file-list>
		<welcome-file>index.jsp</welcome-file>
	</welcome-file-list>
</web-app> 

struts.xml:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">

<struts>
	<constant name="struts.i18n.encoding" value="utf-8"></constant>
	<constant name="struts.enable.DynamicMethodInvocation" value="true"></constant>
	<package name="default" extends="json-default" namespace="/">
		<action name="getjson" class="com.zte.android.LoginAction"
			method="login">
			<result type="json"></result>
		</action>
	</package>
</struts>

Student.java

package com.zte.android;

public class Student
{

	private String name;

	private String age;

	private String school;

	private String phone;

	public String getName()
	{
		return name;
	}

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

	public String getAge()
	{
		return age;
	}

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

	public String getSchool()
	{
		return school;
	}

	public void setSchool(String school)
	{
		this.school = school;
	}

	public String getPhone()
	{
		return phone;
	}

	public void setPhone(String phone)
	{
		this.phone = phone;
	}

}

Login.action:

package com.zte.android;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts2.interceptor.ServletRequestAware;
import org.apache.struts2.interceptor.ServletResponseAware;
import com.google.gson.Gson;
import com.opensymphony.xwork2.ActionSupport;

public class LoginAction extends ActionSupport implements ServletRequestAware,
		ServletResponseAware
{

	/** * */
	private static final long serialVersionUID = 1L;

	HttpServletRequest request;

	HttpServletResponse response;

	private String username;

	private String password;

	public String getPassword()
	{
		return password;
	}

	public void setPassword(String password)
	{
		this.password = password;
	}

	public String getUsername()
	{
		return username;
	}

	public void setUsername(String username)
	{
		this.username = username;
	}

	public void setServletRequest(HttpServletRequest request)
	{
		this.request = request;
	}

	public void setServletResponse(HttpServletResponse response)
	{
		this.response = response;
	}

	/**
	 * 模拟用户登录的业务
	 */
	public void login()
	{
		returnUserInfo();
	}

	private void returnUserInfo()
	{

		this.response.setContentType("text/json;charset=utf-8");
		this.response.setCharacterEncoding("UTF-8");
		String json;
		if (username == null || password == null)
		{

			json = "请求参数错误";
			flushData(json);
			return;
		}
		if (username.equals("123") && password.equals("123"))
		{
			List<Student> list = new ArrayList<Student>();
			Gson gson = new Gson();
			for (int i = 0; i < 10; i++)
			{
				Student st = new Student();
				st.setAge("10" + i);
				st.setName("csh" + i);
				st.setPhone("1333007" + i);
				st.setSchool("abc" + i);
				list.add(st);
			}
			json = gson.toJson(list);
		}
		else
		{
			json = "非法登陆信息！";
		}
		flushData(json);
	}

	private void flushData(String json)
	{
		byte[] jsonBytes;
		try
		{
			jsonBytes = json.getBytes("utf-8");
			response.setContentLength(jsonBytes.length);
			response.getOutputStream().write(jsonBytes);
			response.getOutputStream().flush();
		}
		catch (UnsupportedEncodingException e)
		{
			e.printStackTrace();
		}
		catch (IOException e)
		{
			e.printStackTrace();
		}
		finally
		{
			try
			{
				response.getOutputStream().close();
			}
			catch (IOException e)
			{
				e.printStackTrace();
			}
		}

	}
}

网页ajax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>
<base href="<%=basePath%>">

<title>My JSP 'index.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">
	-->
</head>
<script type="text/javascript">
	var xmlHttpReq; //用于保存XMLHttpRequest对象的全局变量  

	//用于创建XMLHttpRequest对象
	function createXmlHttp() {
		//根据window.XMLHttpRequest对象是否存在使用不同的创建方式
		if (window.XMLHttpRequest) {
			xmlHttp = new XMLHttpRequest(); //FireFox、Opera等浏览器支持的创建方式
		} else {
			xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");//IE浏览器支持的创建方式
		}
	}
	function loadAjax() {
		createXmlHttp(); //创建XmlHttpRequest对象
		var url = "http://localhost:8080/ssh2ToAndroid/getjson.action?userName=admin&password=123456";
		xmlHttpReq.open("GET", url, true);
		xmlHttpReq.onreadystatechange = loadCallback; //IE这里设置回调函数
		xmlHttpReq.send(null);
	}
	function loadCallback() {
		alert(xmlHttpReq.readyState);
		if (xmlHttpReq.readyState == 4) {
			if (xmlHttpReq.status == 200) {
				document.getElementById("contentDiv").innerHTML = xmlHttpReq.responseText;
			}
		}
	}
</script>
<body>
	<div id="contentTypeDiv"></div>
	<br />
	<br />
	<div id="contentDiv"></div>
	<input type="button" value="请求数据" onclick="loadAjax()">
</body>
</html>

android请求数据：

package com.zte.android.greenweb.launcher.http;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;

import com.zte.android.greenweb.launcher.util.LogEx;
import com.zte.android.greenweb.launcher.util.NetConst;

public class HttpConnectionClient
{

	public static final String HTTP_REQUEST_METHOD_GET = "GET";

	public static final String HTTP_REQUEST_METHOD_POST = "POST";

	private HttpURLConnection conn = null;

	/**
	 * 发送请求到http服务然后接收返回报文
	 *
	 * @param path
	 *            请求的http服务的路径
	 * @return 返回请求的响应信息
	 * @throws IOException
	 */
	public int doGet(String path) throws IOException
	{
		URL url = new URL(path);
		// openConnection() 返回一个 URLConnection 对象，它表示到 URL 所引用的远程对象的连接
		conn = (HttpURLConnection) url.openConnection();// 打开一个连接
		conn.setRequestMethod(HTTP_REQUEST_METHOD_GET);// 设置get方式请求
		conn.setConnectTimeout(NetConst.CONNECTED_TIME_OUT);
		conn.setReadTimeout(NetConst.READ_TIME_OUT);
		// 打算使用 URL 连接进行输出，则将 DoOutput 标志设置为 true
		conn.setDoOutput(true);
		// 这里只设置内容类型与内容长度的头字段根据传送内容决定
		// 内容类型Content-Type:
		// application/x-www-form-urlencoded、text/xml;charset=GBK
		// 内容长度Content-Length: 38
		conn.setRequestProperty("Content-Type", "text/xml;charset=UTF-8");
		conn.setRequestProperty("Charset", "UTF-8");
		// 保存调用http服务后的响应信息
		return conn.getResponseCode();
	}

	/**
	 * 发送请求到http服务然后接收返回报文
	 *
	 * @param jsonStr
	 *            请求的json格式的字符串
	 * @param path
	 *            请求的http服务的路径
	 * @return 返回请求的响应信息
	 * @throws IOException
	 */
	public int doPost(String jsonStr, String path) throws IOException
	{
		LogEx.d("doPost request="+jsonStr);
		// 得到请求报文的二进制数据
		byte[] data = jsonStr.getBytes();
		URL url = new URL(path);
		// 打开一个连接
		conn = (HttpURLConnection) url.openConnection();
		// 设置post方式请求
		conn.setRequestMethod(HTTP_REQUEST_METHOD_POST);
		conn.setConnectTimeout(NetConst.CONNECTED_TIME_OUT);
		conn.setReadTimeout(NetConst.READ_TIME_OUT);
		// 打算使用 URL 连接进行输出，则将 DoOutput 标志设置为 true
		conn.setDoOutput(true);
		conn.setDoInput(true);
		// 这里只设置内容类型与内容长度的头字段根据传送内容决定
		// 内容类型Content-Type:
		// application/x-www-form-urlencoded、text/xml;charset=GBK
		// 内容长度Content-Length: 38
		conn.setRequestProperty("Content-Type", "text/xml;charset=UTF-8");
		conn.setRequestProperty("Charset", "UTF-8");
		conn.setRequestProperty("Content-Length", String.valueOf(data.length));
		OutputStream outStream = conn.getOutputStream();// 返回写入到此连接的输出流
		// 把二进制数据写入是输出流
		outStream.write(data);
		// 内存中的数据刷入
		outStream.flush();
		// 关闭流
		outStream.close();
		int ic = 0;
		ic = conn.getResponseCode();
		return ic;
	}

	public String getContent() throws UnsupportedEncodingException, IOException
	{
		if (null == conn)
		{
			return null;
		}

		// 保存调用http服务后的响应信息
		String msg = "";
		// 如果请求响应码是200，则表示成功
		if (conn.getResponseCode() == NetConst.NET_CONNECTED_SUCCESS)
		{
			// HTTP服务端返回的编码是UTF-8,故必须设置为UTF-8,保持编码统一,否则会出现中文乱码
			BufferedReader in =
					new BufferedReader(new InputStreamReader(
							(InputStream) conn.getInputStream(), "UTF-8"));// 返回从此打开的连接读取的输入流
			msg = in.readLine();
			in.close();
		}
		// 断开连接
		conn.disconnect();
		LogEx.d("doPost getContent="+msg);
		return msg;
	}
}

最近在学ssh2框架，很多不懂，放着以后看看。有些代码参照网络的。