HttpClient 资源下载

 

 

import java.io.BufferedReader;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import org.apache.http.HttpEntity;

import org.apache.http.HttpResponse;

import org.apache.http.HttpStatus;

import org.apache.http.client.ClientProtocolException;

import org.apache.http.client.HttpClient;

import org.apache.http.client.methods.HttpGet;

import org.apache.http.impl.client.DefaultHttpClient;

import org.apache.commons.io.IOUtils;

public class HttpClientUtil {

 

public static HttpClient getHttpClient(){

// 创建客户端

HttpClient client = new DefaultHttpClient();

return client;

}

/**

* 通过url加载字符串

* @author:qiuchen

* @createTime:2012-7-9

* @param url

* @return

*/

public static String get(String url) {

String messageStr = null;

// 创建HttpClient实例

HttpClient httpClient = getHttpClient();

// Http Get 请求

HttpGet get = new HttpGet(url);

// 获得服务器响应的所有信息

HttpResponse response = null;

try {

response = httpClient.execute(get);

int state = response.getStatusLine().getStatusCode();

if(state == HttpStatus.SC_OK){ //状态码=200

// 获得服务器响应的信息(除head部分,源代码中是看不到的)

HttpEntity entity = response.getEntity();

//获取输入流

InputStream input = entity.getContent();

// 缓冲读取器

BufferedReader reader = new BufferedReader(new InputStreamReader(input,"utf-8"));

StringBuffer sb = new StringBuffer();

String line = null;

while((line=reader.readLine()) != null) {

sb.append(line);

}

reader.close();

input.close();

messageStr = sb.toString();

}else{

System.out.println("load json music error");

}

} catch (ClientProtocolException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

} finally{

if(httpClient != null){

httpClient.getConnectionManager().shutdown();

}

}

return messageStr;

}

/**

* 通过url下载数据到本地文件

* @author:qiuchen

* @createTime:2012-7-9

* @param url

* @return

*/

public static boolean download(String url){

//创建客户端

HttpClient httpClient = getHttpClient();

 

//文件下载路径

String savePath = "f:/data.txt";

 

// Http Get 请求

HttpGet get = new HttpGet(url);

 

// 获得服务器响应的所有信息

HttpResponse response = null;

try {

response = httpClient.execute(get);

//状态码

int state = response.getStatusLine().getStatusCode();

System.out.println(state);

if(state == HttpStatus.SC_OK){ //状态码=200

// 获得服务器响应的信息(除head部分,源代码中是看不到的)

HttpEntity entity = response.getEntity();

System.out.println("fileLength:"+entity.getContentLength());

System.out.println(entity);

//获取输入流

InputStream input = entity.getContent();

//定义输出文件(文件格式要和资源匹配)

FileOutputStream bout = new FileOutputStream(savePath);

//COPY

IOUtils.copy(input, bout);

 

input.close(); // 关闭输入流

bout.close(); //关闭输出流

 

System.out.println("download success");

}else{

System.out.println("read error");

}

} catch (ClientProtocolException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

} finally{

if(httpClient != null){

httpClient.getConnectionManager().shutdown();

}

}

return true;

}

}