connection.getInputStream()抛出java.io.FileNotFoundException,该如何处理

connection.getInputStream()抛出java.io.FileNotFoundException

package com.example.method;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;

public class HandMessage {

	private static String a="LW";
	public static ArrayList<String> queryStringForPost(String url,String method) throws IOException{
		URL postUrl = new URL(url);
        HttpURLConnection connection = (HttpURLConnection) postUrl
                .openConnection();
        connection.setDoOutput(true);
        connection.setDoInput(true);
        connection.setRequestMethod("POST");
        connection.setUseCaches(false);
        connection.setInstanceFollowRedirects(true);
        connection.setRequestProperty("Content-Type","application/x-www-form-urlencoded");

        connection.setChunkedStreamingMode(5);
        connection.connect();
       
        DataOutputStream out = new DataOutputStream(connection
                .getOutputStream());
        
        String mthd = method.subSequence(0, 2).toString();
        String ext="";
        if(method.length()>2)
        {
        	ext=method.substring(2).toString();
        }
        String content = mthd;
        out.writeBytes(content); 

        out.flush();
        out.close(); 
        BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
        
        out.flush();
        out.close(); 
        String line;
        String s="zhbd";
        List<String> list = new ArrayList<String>();
        System.out.println("GetData~~~~~~~~~~~~~~~~~~~~~~~~~");
        while ((line = reader.readLine()) != null) {
            System.out.println(line);
            s+=line;
            list.add(line);
        }
        System.out.println("GetData~~~~~~~~~~~~~~~~~~~~~~~~~");
        reader.close();
        connection.disconnect();
        a=s;
        return (ArrayList<String>) list;
    }
	public String getA()
	{
		return a;
	}
	
}

由于
BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
出现了异常，导致没有读取到list里面数据。从而程序报错。。。求大神帮我。。
下面是logcat

06-13 16:49:05.506: W/System.err(13029): java.io.FileNotFoundException: http://10.0.2.2:8080/androidWeb/servlet/loadMessage
06-13 16:49:05.516: W/System.err(13029):  at libcore.net.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:177)
06-13 16:49:05.516: W/System.err(13029):  at com.example.method.HandMessage.queryStringForPost(HandMessage.java:43)
06-13 16:49:05.516: W/System.err(13029):  at com.example.method.Runhandle.run(Runhandle.java:23)
06-13 16:49:05.516: W/System.err(13029):  at java.lang.Thread.run(Thread.java:856)
06-13 16:49:05.616: W/dalvikvm(13029): threadid=12: thread exiting with uncaught exception (group=0x416fd498)
06-13 16:49:05.616: E/AndroidRuntime(13029): FATAL EXCEPTION: Thread-4837
06-13 16:49:05.616: E/AndroidRuntime(13029): java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0
06-13 16:49:05.616: E/AndroidRuntime(13029):  at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:251)