java使用HttpClient通过url下载文件到本地

package lgy; import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.client.methods.HttpGet; import org.apache.http.impl.client.DefaultHttpClient; import java.io.*; public class DownLoad { private DefaultHttpClient httpClient = new DefaultHttpClient(); public void downLoad(String url, String dst) { try { HttpGet httpGet = new HttpGet(url); HttpResponse httpResponse = httpClient.execute(httpGet); HttpEntity entity = httpResponse.getEntity(); InputStream in = entity.getContent(); long length=entity.getContentLength(); if(length<=0){ System.out.println("下载文件不存在！"); return; } OutputStream out = new FileOutputStream(new File(dst)); saveTo(in, out); } catch (IOException e) { e.printStackTrace(); } catch (Exception e) { e.printStackTrace(); } } public void saveTo(InputStream in, OutputStream out) throws Exception { byte[] data = new byte[1024*1024]; int index =0; while ((index=in.read(data) )!= -1) { out.write(data,0,index); } in.close(); out.close(); } public static void main(String args[]) { DownLoad downLoad = new DownLoad(); String url = "http://pan.baidu.com/s/1bPPqfc请修改链接"; downLoad.downLoad(url, "D:/所下载的文件名（文件名要相同）"); } }