httpclient 4 下载 文件

import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import org.apache.http.HttpEntity;import org.apache.http.HttpHost;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;public class SearchDomain {public static void main(String[] args) throws ClientProtocolException, IOException {//实例化一个HttpClientHttpClient httpClient = new DefaultHttpClient();//设定目标站点  web的默认端口80可以不写的 当然如果是其它端口就要标明                                                           HttpHost httpHost = new HttpHost("www.shanhe114.com",80);//设置需要下载的文件HttpGet httpGet = new HttpGet("/test.zip");//这里也可以直接使用httpGet的绝对地址，当然如果不是具体地址不要忘记/结尾//HttpGet httpGet = new HttpGet("http://www.0431.la/");//HttpResponse response = httpClient.execute(httpGet);HttpResponse response = httpClient.execute(httpHost, httpGet);if(HttpStatus.SC_OK==response.getStatusLine().getStatusCode()){//请求成功//取得请求内容HttpEntity entity = response.getEntity();//显示内容if (entity != null) {//这里可以得到文件的类型 如image/jpg /zip /tiff 等等 但是发现并不是十分有效，有时明明后缀是.rar但是取到的是null，这点特别说明System.out.println(entity.getContentType());//可以判断是否是文件数据流System.out.println(entity.isStreaming());//设置本地保存的文件File storeFile = new File("c:/0431la.zip");  FileOutputStream output = new FileOutputStream(storeFile);//得到网络资源并写入文件InputStream input = entity.getContent();byte b[] = new byte[1024];int j = 0;while( (j = input.read(b))!=-1){output.write(b,0,j);}output.flush();output.close(); }if (entity != null) {entity.consumeContent();}}}}

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