javaのHttpClientでファイルをダウンロード(proxy経由とBASIC認証付き)

package com.koji;
 
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
 
import org.apache.http.Header;
import org.apache.http.HttpEntity;
import org.apache.http.HttpHost;
import org.apache.http.HttpResponse;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.client.AuthCache;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.protocol.ClientContext;
import org.apache.http.conn.params.ConnRoutePNames;
import org.apache.http.impl.auth.BasicScheme;
import org.apache.http.impl.client.BasicAuthCache;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.protocol.BasicHttpContext;
import org.apache.http.util.EntityUtils;
 
public class HttpConnect {
 
private static final String PROXY_HOST = "xxxxxxxxx.co.jp";
private static final int PROXY_PORT = 8080;
 
private static final String TARGET_HOST = "xxxxxxxxxxx.jp";
private static final int TARGET_PORT = 80;
 
private static final String BASIC_USER= "sampleUser";
private static final String BASIC_PASS= "samplePassword";
 
private static final String GET_PARAM= "/xxxxxxxxx/xxxxxx?ID=yyyyy&2ID2=wwwww";
 
    public final static void main(String[] args) throws Exception {
 
    DefaultHttpClient httpclient = null;
    HttpHost proxy = null;
    HttpHost targetHost = null;
 
    InputStream is = null;
    FileOutputStream out = null;
    HttpEntity entity = null;
 
        try {
            httpclient = new DefaultHttpClient();
 
            proxy = new HttpHost(PROXY_HOST, PROXY_PORT, "http");
            httpclient.getParams().setParameter(ConnRoutePNames.DEFAULT_PROXY, proxy);
 
            targetHost = new HttpHost(TARGET_HOST, TARGET_PORT, "http");
 
            httpclient.getCredentialsProvider().setCredentials(
                new AuthScope(targetHost.getHostName(), targetHost.getPort()),
                new UsernamePasswordCredentials(BASIC_USER, BASIC_PASS));
 
            AuthCache authCache = new BasicAuthCache();
            BasicScheme basicAuth = new BasicScheme();
            authCache.put(targetHost, basicAuth);
            BasicHttpContext localcontext = new BasicHttpContext();
            localcontext.setAttribute(ClientContext.AUTH_CACHE, authCache);
 
 
            HttpGet httpget = new HttpGet(GET_PARAM);
 
            HttpResponse response = httpclient.execute(targetHost, httpget, localcontext);
            entity = response.getEntity();
 
            System.out.println("response=" + response.getAllHeaders());
 
            // レスポンスヘッダーの取得(ファイルが無かった場合などは404)
            System.out.println("StatusCode=" + response.getStatusLine().getStatusCode());
 
            if(response.getStatusLine().getStatusCode() != 200 ){
 
            System.out.println("StatusCode:" + response.getStatusLine().getStatusCode());
                return;
            }
 
            Header[] headers = response.getAllHeaders();
                for (Header header : headers) {
                System.out.println(header.getName() + ": " + header.getValue());
            }
 
            // entityが取れなかった場合は、Connectionのことは心配しないでもOK
            if (entity != null) {
 
                System.out.println(EntityUtils.toString(entity));
 
                is = entity.getContent();
                System.out.println("length: " + entity.getContentLength());
 
                File file = new File("C:tttt.zip"); // 保存先
                out = new FileOutputStream(file, false);
 
                int b;
                while((b = is.read()) != -1){
                    out.write(b);
                }
 
                out.close();
                is.close();
 
                EntityUtils.consume(entity);
                //depriciated
                entity.consumeContent();
            }
 
            System.out.println("ダウンロードしました。");
 
        }catch (FileNotFoundException e) {
            // Fileオブジェクト生成時の例外捕捉
            e.printStackTrace();
 
        } catch (IOException ioe) {
            ioe.printStackTrace();
 
        }finally {
            httpclient.getConnectionManager().shutdown();
            try {
                if(out != null){
                    out.close();
            }
            if(is != null){
                is.close();
            }
            } catch(IOException e) {

            e.printStackTrace();
            }
 
        }
    }
}