关于HttpClient的总结

原文地址：http://blog.csdn.net/shimiso/article/details/7047447

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));

-----------------------------------------------------

注意，这篇博客总结的不错，学习一下，多谢博主分享哦