android实现异步下载过程

package com.example.duomimusic.utils;

import java.io.IOException;

import java.io.InputStream;

import java.net.HttpURLConnection;

import java.net.URL;

import org.apache.http.util.ByteArrayBuffer;

public class HttpUtils

{

public static String downloadJson(URL... params)

{

//得到url网址

URL url = params[0];

InputStream is = null;

ByteArrayBuffer strBuf = new ByteArrayBuffer(3000);

try

{

HttpURLConnection conn = (HttpURLConnection) url.openConnection();

//设置服务器连接超时时间

conn.setConnectTimeout(30000);

conn.setReadTimeout(30000);

//判断服务器是否正确响应

if (conn.getResponseCode() == HttpURLConnection.HTTP_OK)

{

is = conn.getInputStream();

byte[] buffer = new byte[1024];

int length = 0;

while (-1 != (length = is.read(buffer)))

{

strBuf.append(buffer, 0, length);

}

else

{

return null;

}

catch (IOException e)

{

e.printStackTrace();

}

finally

{

if (null != is)

{

try

{

is.close();

}

catch (IOException e)

{

e.printStackTrace();

}

return new String(strBuf.buffer(), 0 ,strBuf.length() );

}

本文出自 “android应用开发” 博客，谢绝转载！

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