Request.java

package com.example.slidingmenu.yujing.client.network;

import java.io.IOException;
import java.net.ProtocolException;
import java.net.URL;
import java.net.URLEncoder;

import org.json.JSONException;
import org.json.JSONObject;


import android.util.Log;

import com.example.slidingmenu.yujing.client.application.ClientApplication;


public class Request {
	
	private static final int CONNECTTIMEOUT = 30000;
	
	private static final int READTIMEOUT = 10000;

	/**
	 * 访问服务器<br/>
	 * 没有做是否联网的判断。但是可以用于wifi、wap、net
	 * @param json - 手机客户端请求json
	 * @return ""表示访问失败，成功则返回对应的json字符串
	 */
	public static String request( String json ) {
		//判断是否为json字符串
		try {
			new JSONObject( json );
		} catch ( JSONException e ) {
			Log.e( "Request", "不是json数据", e );
			return "";
		}		
		
		byte[] response = null;
		try {
			
			URL url = new URL( 
					ClientApplication.HTTP, 
					ClientApplication.IP_ADDRESS, 
					ClientApplication.PORT, 
					ClientApplication.FILE );
			response = HttpClient.connect( 
					url, 
					HttpClient.HTTP_POST, 
					"requestParam=" + URLEncoder.encode( json, "utf-8" ),
					Request.CONNECTTIMEOUT, 
					Request.READTIMEOUT);
		} catch (NullPointerException e) {
			e.printStackTrace();
		} catch (ProtocolException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		
		try {
			String res = new String( response, "utf-8" );
			return res.trim();
		} catch ( Exception e ) {
			Log.e( "Request", "访问失败", e );
			return "";
		}
	}
}