httpclient proxy 获取权限，然后下载文件

public class SimulateLogin {
        private HttpClient httpClient;
        
        public SimulateLogin(String loginURL, String userName, String password, String iplogin) {
            this.httpClient = new DefaultHttpClient();
            // 构造一个POST请求  
            HttpPost httpPost = new HttpPost(loginURL);
            httpPost
                    .setHeader("User-Agent",
                            "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US) AppleWebKit/534.3 (KHTML, like Gecko) Chrome/6.0.472.63 Safari/534.3"); //如果对方系统没做特殊限制，可不用  
            // 将要POST的数据封包    
            List<NameValuePair> params = new ArrayList<NameValuePair>();
            params.add(new BasicNameValuePair("username", userName));
            params.add(new BasicNameValuePair("password", password));
           // params.add(new BasicNameValuePair("iplogin", iplogin));
            // 封包添加到Post请求    
            try {
                httpPost.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8));
            } catch (UnsupportedEncodingException e1) {
                e1.printStackTrace();
            }
            HttpResponse response = postMethod(httpPost);
        }
        
        /** 
         * 嗅探指定的GET页面 
         * @param url 
         * @return String txt 
         */
        public String notifyGetPage(String url) {
            HttpGet get = new HttpGet(url);
            ResponseHandler<String> responseHandler = new BasicResponseHandler();
            String txt = null;
            try {
                txt = httpClient.execute(get, responseHandler);
            } catch (ClientProtocolException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                get.abort();
            }
            return txt;
        }
        
        /** 
         * 嗅探指定的POST页面,，因为post方法要封装参数，因此在函数外部封装好传参   
         * @param post 
         * @return String txt 
         */
        public String notifyPostPage(HttpPost post) {
            ResponseHandler<String> responseHandler = new BasicResponseHandler();
            String txt = null;
            try {
                txt = httpClient.execute(post, responseHandler);
            } catch (ClientProtocolException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                post.abort();
            }
            return txt;
        }
        
        // 用post方法向服务器请求 并获得响应，因为post方法要封装参数，因此在函数外部封装好传参    
        public HttpResponse postMethod(HttpPost post) {
            HttpResponse resp = null;
            try {
                resp = httpClient.execute(post);
            } catch (ClientProtocolException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                post.abort();
            }
            return resp;
        }
        
        // 用get方法向服务器请求 并获得响应    
        public HttpResponse getMethod(String url) {
            HttpGet get = new HttpGet(url);
            HttpResponse resp = null;
            try {
                resp = httpClient.execute(get);
            } catch (ClientProtocolException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                get.abort();
            }
            return resp;
        }
        
        /**
         *输出数据
         */
        public void outputData(HttpServletResponse resp,String url) throws IOException {
            HttpGet httpget = new HttpGet(url);
            HttpResponse response = this.httpClient.execute(httpget);
            HttpEntity entity = response.getEntity();
            ServletOutputStream output = resp.getOutputStream();
            if (entity != null) {
                InputStream instream = entity.getContent();
                int len;
                while ((len = instream.read()) != -1) {
                    output.write(len);
                }
                output.close();
                instream.close();
            }
             this.httpClient.getConnectionManager().shutdown();
            
        }
        
        //第一个参数，网络连接；第二个参数，保存到本地文件的地址
        public void getFile(HttpServletResponse resp,String url,boolean ispdf) {
                HttpGet get = new HttpGet(url);
                try {
                    ResponseHandler<byte[]> handler = new ResponseHandler<byte[]>() {
                        public byte[] handleResponse(HttpResponse response)
                                throws ClientProtocolException, IOException {
                            HttpEntity entity = response.getEntity();
                            if (entity != null) {
                                return EntityUtils.toByteArray(entity);
                            } else {
                                return null;
                            }
                        }
                    };

                    byte[] charts = this.httpClient.execute(get, handler);
                    Header[] headers= getMethod(url).getAllHeaders();
                    for(Header h:headers){
                        if(h.getValue().indexOf("kdh")!=-1&&ispdf){
                            resp.setHeader(h.getName(),h.getValue().replaceAll("kdh","pdf"));
                        }else{
                            resp.setHeader(h.getName(),h.getValue());
                        }
                    }
                    ServletOutputStream out = resp.getOutputStream();
                    out.write(charts);
                    out.close();
                } catch (Exception e) {
                    e.printStackTrace();
                } finally {
                    this.httpClient.getConnectionManager().shutdown();
                }
            }
        
    }

simulateLogin.getFile(response,link,ispdf);