HttpClients下载文件

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;

import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;

  public static String getFile() {
	  String userName = "";
	  if (getSeeyonRestClient()) {
	   CloseableHttpClient httpClient = null;
	   try {
	    httpClient = HttpClients.createDefault();
	    String url = 地址;
	    HttpGet httpGet = new HttpGet(url);
	    // 发起请求 并返回请求的响应
	    CloseableHttpResponse response = httpClient.execute(httpGet);
	    System.out.println("response: "+response);
	    try {
	     // 获取响应对象
	     HttpEntity resEntity = response.getEntity();
	     System.out.println("resEntity: "+resEntity);
	     
	     byte[] data = EntityUtils.toByteArray(resEntity);
	     System.out.println(data);
	     FileOutputStream fos = new FileOutputStream("D:\Workspace\aa.pdf");
	     fos.write(data);
	     fos.close();
	     EntityUtils.consume(resEntity);
	    } finally {
	     response.close();
	    }
	   } catch (Exception ex) {
	    ex.printStackTrace();
	   } finally {
	    try {
	     if (httpClient != null) {
	      httpClient.close();
	     }
	    } catch (IOException e) {
	     e.printStackTrace();
	    }
	   }
	  }
	  return userName;
	 }

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