httpclient工具使用(org.apache.httpcomponents.httpclient)
httpclient工具使用(org.apache.httpcomponents.httpclient)
引入依赖
<dependency> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpclient</artifactId> <version>4.3.5</version> </dependency>
get请求
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(); }
get带参数请求
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(); } }
http post请求
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200 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(); } }
http post带参数请求
public static void main(String[] args) throws Exception{ //创建httpclient CloseableHttpClient httpClient = HttpClients.createDefault(); //创建http post HttpPost 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httpost httpPost.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(); } }