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();
            }

        }
    }

}