<dependency><groupId>org.apache.httpcomponents</groupId><artifactId>httpclient</artifactId><version>4.3.5</version></dependency>

public static void main(String[] args) throws Exception {//创建httpclient对象CloseableHttpClient httpClient = HttpClients.createDefault();//创建Http get请求HttpGet httpGet = new HttpGet("http://www.xxx.com/rest/content?categoryId=4&page=1&rows=20");//接收返回值CloseableHttpResponse response = null;try {//请求执行response = httpClient.execute(httpGet);if(response.getStatusLine().getStatusCode()==200){String content = EntityUtils.toString(response.getEntity(), "utf-8");System.out.println("--------->" + content);}}finally{if(response!=null){response.close();}httpClient.close();}

public static void main(String[] args) throws Exception{//创建httpClient对象CloseableHttpClient httpClient = HttpClients.createDefault();//定义http get参数URI uri = new URIBuilder("http://www.xxxx.com/rest/content").setParameter("categoryId", "4").setParameter("page", "1").setParameter("rows", "30").build();System.out.println(uri);//创建http get请求HttpGet httpGet = new HttpGet(uri);//接受请求返回的定义CloseableHttpResponse response = null;try {//执行get请求response = httpClient.execute(httpGet);if(response.getStatusLine().getStatusCode()==200){String content = EntityUtils.toString(response.getEntity(), "utf-8");System.out.println(content);}}finally{if(response!=null){response.close();}httpClient.close();}}

 public static void main(String[] args) throws Exception {// 创建Httpclient对象CloseableHttpClient httpclient = HttpClients.createDefault();// 创建http POST请求HttpPost httpPost = new HttpPost("http://www.oschina.net/");// 伪装成浏览器httpPost.setHeader("User-Agent", "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.94 Safari/537.36");CloseableHttpResponse response = null;try {// 执行请求response = httpclient.execute(httpPost);// 判断返回状态是否为200if (response.getStatusLine().getStatusCode() == 200) {String content = EntityUtils.toString(response.getEntity(), "UTF-8");System.out.println(content);}} finally {if (response != null) {response.close();}httpclient.close();}}

public static void main(String[] args) throws Exception{//创建httpclientCloseableHttpClient httpClient = HttpClients.createDefault();//创建http postHttpPost httpPost = new HttpPost("http://www.oschina.net/search");//模拟浏览器设置头httpPost.setHeader("User-Agent","Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.94 Safari/537.36");//设置请求数据List<NameValuePair> params = new ArrayList<NameValuePair>();params.add(new BasicNameValuePair("scope", "project"));params.add(new BasicNameValuePair("q", "java"));params.add(new BasicNameValuePair("fromerr", "7nXH76r7"));//构建表单UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(params);//将表达请求放入到httposthttpPost.setEntity(formEntity);//返回类型CloseableHttpResponse response = null;try {response = httpClient.execute(httpPost);String content = EntityUtils.toString(response.getEntity(), "utf-8");System.out.println(content);}finally{if(response!=null){response.close();}httpClient.close();}}