//创建一个客户端HttpClient client = new DefaultHttpClient();//创建一个get方法HttpGet get = new HttpGet("http://www.baidu.com");//执行请求HttpResponse res = client.execute(get);//获取协议版本???「HTTP/1.1」System.out.println(res.getProtocolVersion());//获取返回状态码???「200」System.out.println(res.getStatusLine().getStatusCode());//获取原因短语???「OK」System.out.println(res.getStatusLine().getReasonPhrase());//获取完整的StatusLine???「HTTP/1.1 200 OK」System.out.println(res.getStatusLine().toString());//获取返回头部信息Header[] headers = res.getAllHeaders();for (Header header : headers) {    System.out.println(header.getName() + ": " + header.getValue());}//获取返回内容if (res.getEntity() != null) {    System.out.println(EntityUtils.toString(res.getEntity()));}//关闭流EntityUtils.consume(res.getEntity());//关闭连接client.getConnectionManager().shutdown();

//生成CookieCookieStore cookieStore = new BasicCookieStore();BasicClientCookie stdCookie = new BasicClientCookie("name", "value");stdCookie.setVersion(1);stdCookie.setDomain(".baidu.com");stdCookie.setPath("/");stdCookie.setSecure(true);stdCookie.setAttribute(ClientCookie.VERSION_ATTR, "1");stdCookie.setAttribute(ClientCookie.DOMAIN_ATTR, ".baidu.com");cookieStore.addCookie(stdCookie);DefaultHttpClient client1 = new DefaultHttpClient();client1.setCookieStore(cookieStore);client1.execute(new HttpGet("http://www.baidu.com/"));//获取CookieDefaultHttpClient client2 = new DefaultHttpClient();HttpGet httpget = new HttpGet("http://www.baidu.com/");HttpResponse res = client2.execute(httpget);List<Cookie> cookies = client2.getCookieStore().getCookies();for (Cookie cookie : cookies) {    System.out.println(cookie.getName());    System.out.println(cookie.getValue());}EntityUtils.consume(res.getEntity());

//通过连接参数设置代理DefaultHttpClient client1 = new DefaultHttpClient();HttpHost proxy1 = new HttpHost("192.168.2.60", 8080, "HTTP");client1.getParams().setParameter(ConnRoutePNames.DEFAULT_PROXY, proxy1);HttpGet get1 = new HttpGet("http://www.facebook.com");HttpResponse res1 = client1.execute(get1);if (res1.getEntity() != null) {    System.out.println(EntityUtils.toString(res1.getEntity()));}        EntityUtils.consume(res1.getEntity());//设置代理认证//client1.getCredentialsProvider().setCredentials(//        new AuthScope("localhost", 8080),//        new UsernamePasswordCredentials("username", "password"));

//========UrlEncodedFormEntityList<NameValuePair> formparams = new ArrayList<NameValuePair>();formparams.add(new BasicNameValuePair("param1", "value1"));formparams.add(new BasicNameValuePair("param2", "value2"));UrlEncodedFormEntity entity1 = new UrlEncodedFormEntity(formparams, "UTF-8");HttpPost post1 = new HttpPost("http://localhost/post1.do");post1.setEntity(entity1);new DefaultHttpClient().execute(post1);//========FileEntityFileEntity entity2 = new FileEntity(new File("c:\\sample.txt"));entity2.setContentEncoding("UTF-8");HttpPost post2 = new HttpPost("http://localhost/post2.do");post2.setEntity(entity2);new DefaultHttpClient().execute(post2);//========MultipartEntityHttpPost post3 = new HttpPost("http://localhost/post3.do");File upfile = new File("C:\\test.jpg");MultipartEntity entity3 = new MultipartEntity(HttpMultipartMode.BROWSER_COMPATIBLE, null, Charset.forName("UTF-8"));entity3.addPart("file_name",     new StringBody(upfile.getName()));entity3.addPart("file_contents", new FileBody(upfile));post3.setEntity(entity3);new DefaultHttpClient().execute(post3);

//方法一URI uri1 = URIUtils.createURI("http", "www.baidu.com", -1, "/s",        "wd=rensanning&rsv_bp=0&rsv_spt=3&inputT=1766", null);HttpGet httpget1 = new HttpGet(uri1);//http://www.baidu.com/s?wd=rensanning&rsv_bp=0&rsv_spt=3&inputT=1766System.out.println(httpget1.getURI());//方法二List<NameValuePair> qparams = new ArrayList<NameValuePair>();qparams.add(new BasicNameValuePair("wd", "rensanning"));qparams.add(new BasicNameValuePair("rsv_bp", "0"));qparams.add(new BasicNameValuePair("rsv_spt", "3"));qparams.add(new BasicNameValuePair("inputT", "1766"));URI uri2 = URIUtils.createURI("http", "www.baidu.com", -1, "/s",        URLEncodedUtils.format(qparams, "UTF-8"), null);HttpGet httpget2 = new HttpGet(uri2);//http://www.baidu.com/s?wd=rensanning&rsv_bp=0&rsv_spt=3&inputT=1766System.out.println(httpget2.getURI());

DefaultHttpClient  httpclient = new DefaultHttpClient();//========将Scheme设置到client中SSLSocketFactory socketFactory = SSLSocketFactory.getSocketFactory();Scheme httpsScheme = new Scheme("https", 443, socketFactory);httpclient.getConnectionManager().getSchemeRegistry().register(httpsScheme);HttpGet httpget = new HttpGet("https://xxx.xxx.xxx");HttpResponse res =  httpclient.execute(httpget);System.out.println(EntityUtils.toString(res.getEntity()));//========使用证书做SSL连接KeyStore keyStore = KeyStore.getInstance(KeyStore.getDefaultType());FileInputStream fis = new FileInputStream("c:\\aa.keystore");try {    keyStore.load(fis, "password".toCharArray());} finally {    fis.close();}@SuppressWarnings("unused")SSLSocketFactory socketFactory2 = new SSLSocketFactory(keyStore);//......

//========BASIC认证DefaultHttpClient httpclient1 = new DefaultHttpClient();UsernamePasswordCredentials creds1 = new UsernamePasswordCredentials("userid", "password");AuthScope auth1 = new AuthScope("localhost", 80);httpclient1.getCredentialsProvider().setCredentials(auth1, creds1);HttpGet httpget1 = new HttpGet("http://localhost/auth1");@SuppressWarnings("unused")HttpResponse res1 =  httpclient1.execute(httpget1);//========BASIC认证(HttpContext)DefaultHttpClient httpclient2 = new DefaultHttpClient();UsernamePasswordCredentials creds2 = new UsernamePasswordCredentials("admin", "admin");AuthScope auth2 = new AuthScope("localhost", 80);httpclient2.getCredentialsProvider().setCredentials(auth2, creds2);HttpHost targetHost2 = new HttpHost("localhost", 80, "http");AuthCache authCache = new BasicAuthCache();BasicScheme basicAuth = new BasicScheme();authCache.put(targetHost2, basicAuth);BasicHttpContext localcontext2 = new BasicHttpContext();localcontext2.setAttribute(ClientContext.AUTH_CACHE, authCache);HttpGet httpget2 = new HttpGet("http://localhost/auth2");@SuppressWarnings("unused")HttpResponse res2 =  httpclient2.execute(httpget2, localcontext2);//========DIGEST认证DefaultHttpClient httpclient3 = new DefaultHttpClient();UsernamePasswordCredentials creds3 = new UsernamePasswordCredentials("admin", "admin");AuthScope auth3 = new AuthScope("localhost", 80);httpclient3.getCredentialsProvider().setCredentials(auth3, creds3);HttpHost targetHost3 = new HttpHost("localhost", 80, "http");AuthCache authCache3 = new BasicAuthCache();DigestScheme digestAuth = new DigestScheme();digestAuth.overrideParamter("realm", "some realm");digestAuth.overrideParamter("nonce", "whatever");authCache3.put(targetHost3, digestAuth);BasicHttpContext localcontext3 = new BasicHttpContext();localcontext3.setAttribute(ClientContext.AUTH_CACHE, authCache3);HttpGet httpget3 = new HttpGet("http://localhost/auth3");@SuppressWarnings("unused")HttpResponse res3 =  httpclient2.execute(httpget3, localcontext3);//========NTLM认证DefaultHttpClient httpclient4 = new DefaultHttpClient();NTCredentials creds4 = new NTCredentials("user", "pwd", "myworkstation", "microsoft.com");httpclient4.getCredentialsProvider().setCredentials(AuthScope.ANY, creds4);HttpHost targetHost4 = new HttpHost("hostname", 80, "http");HttpContext localcontext4 = new BasicHttpContext();HttpGet httpget4 = new HttpGet("http://localhost/auth4");@SuppressWarnings("unused")HttpResponse res4 = httpclient3.execute(targetHost4, httpget4, localcontext4);

SchemeRegistry schemeRegistry = new SchemeRegistry();schemeRegistry.register(new Scheme("http", 80, PlainSocketFactory.getSocketFactory()));schemeRegistry.register(new Scheme("https", 443, SSLSocketFactory.getSocketFactory()));PoolingClientConnectionManager cm = new PoolingClientConnectionManager(schemeRegistry);//设置连接最大数cm.setMaxTotal(200);//设置每个Route的连接最大数cm.setDefaultMaxPerRoute(20);//设置指定域的连接最大数HttpHost localhost = new HttpHost("locahost", 80);cm.setMaxPerRoute(new HttpRoute(localhost), 50);HttpGet httpget = new HttpGet("http://localhost/pool");HttpClient client = new DefaultHttpClient(cm);@SuppressWarnings("unused")HttpResponse res = client.execute(httpget);