关于HttpClient的总结（一）

?????? 关于Httpclient的使用总结如下：

(1)当HttpClient的实例不再需要时，可以使用连接管理器关闭httpclient.getConnectionManager().shutdown();  

(2)针对HTTPs的协议的HttpClient请求必须用户和密码 httpclient.getCredentialsProvider()            .setCredentials(new AuthScope("localhost", 443),                 new UsernamePasswordCredentials("username", "password"));

(3)如果不想获取HTTPClient返回的信息   httpclient.abort();

   (4)httpclient传送文件的方式        HttpClient httpclient = new DefaultHttpClient();        HttpPost httppost = new HttpPost("http://www.apache.org");        File file = new File(args[0]);        InputStreamEntity reqEntity = new InputStreamEntity(                new FileInputStream(file), -1);        reqEntity.setContentType("binary/octet-stream");        reqEntity.setChunked(true);        // It may be more appropriate to use FileEntity class in this particular         // instance but we are using a more generic InputStreamEntity to demonstrate        // the capability to stream out data from any arbitrary source        //         // FileEntity entity = new FileEntity(file, "binary/octet-stream");         httppost.setEntity(reqEntity);        System.out.println("executing request " + httppost.getRequestLine());        HttpResponse response = httpclient.execute(httppost);

(5)获取Cookie的信息        HttpClient httpclient = new DefaultHttpClient();        // 创建一个本地Cookie存储的实例        CookieStore cookieStore = new BasicCookieStore();        //创建一个本地上下文信息        HttpContext localContext = new BasicHttpContext();        //在本地上下问中绑定一个本地存储        localContext.setAttribute(ClientContext.COOKIE_STORE, cookieStore);        //设置请求的路径        HttpGet httpget = new HttpGet("http://www.google.com/");         //传递本地的http上下文给服务器        HttpResponse response = httpclient.execute(httpget, localContext);        //获取本地信息        HttpEntity entity = response.getEntity();        System.out.println(response.getStatusLine());        if (entity != null) {            System.out.println("Response content length: " + entity.getContentLength());        }        //获取cookie中的各种信息        List<Cookie> cookies = cookieStore.getCookies();        for (int i = 0; i < cookies.size(); i++) {            System.out.println("Local cookie: " + cookies.get(i));        }        //获取消息头的信息        Header[] headers = response.getAllHeaders();        for (int i = 0; i<headers.length; i++) {            System.out.println(headers[i]);        }

(6)针对典型的SSL请求的处理        DefaultHttpClient httpclient = new DefaultHttpClient();        //获取默认的存储密钥类        KeyStore trustStore  = KeyStore.getInstance(KeyStore.getDefaultType());         //加载本地的密钥信息               FileInputStream instream = new FileInputStream(new File("my.keystore"));         try {            trustStore.load(instream, "nopassword".toCharArray());        } finally {            instream.close();        }        //创建SSLSocketFactory，创建相关的Socket        SSLSocketFactory socketFactory = new SSLSocketFactory(trustStore);        //设置协议的类型和密钥信息，以及断开信息        Scheme sch = new Scheme("https", socketFactory, 443);        //在连接管理器中注册中信息        httpclient.getConnectionManager().getSchemeRegistry().register(sch);

(7)设置请求的参数的几种方式A.在请求的路径中以查询字符串格式传递参数B.在请求的实体中添加参数        List <NameValuePair> nvps = new ArrayList <NameValuePair>();        nvps.add(new BasicNameValuePair("IDToken1", "username"));        nvps.add(new BasicNameValuePair("IDToken2", "password"));        httpost.setEntity(new UrlEncodedFormEntity(nvps, HTTP.UTF_8));

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