POST請求

HttpPostTest.java

package cn.itcast.crawler.test;import org.apache.http.client.methods.CloseableHttpResponse; import org.apache.http.client.methods.HttpGet; import org.apache.http.client.methods.HttpPost; import org.apache.http.impl.client.CloseableHttpClient; import org.apache.http.impl.client.HttpClients; import org.apache.http.util.EntityUtils;import java.io.IOException;public class HttpPostTest {public static void main(String[] args) {//創建HttpClient對象CloseableHttpClient httpClient = HttpClients.createDefault();//創建HttpPost對象，設置url訪問地址HttpPost httpPost = new HttpPost("http://www.itcast.cn");CloseableHttpResponse response = null;try {//使用HttpClient發起請求，獲取responseresponse = httpClient.execute(httpPost);//解析響應if (response.getStatusLine().getStatusCode() == 200) {String content = EntityUtils.toString(response.getEntity(), "utf8");System.out.println(content.length());}} catch (IOException e) {e.printStackTrace();}finally {//關閉responsetry {response.close();} catch (IOException e) {e.printStackTrace();}try {httpClient.close();} catch (IOException e) {e.printStackTrace();}}} }

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帶參數的POST請求

HttpPostParamTest.java

package cn.itcast.crawler.test;import org.apache.http.NameValuePair; import org.apache.http.client.entity.UrlEncodedFormEntity; import org.apache.http.client.methods.CloseableHttpResponse; import org.apache.http.client.methods.HttpPost; import org.apache.http.impl.client.CloseableHttpClient; import org.apache.http.impl.client.HttpClients; import org.apache.http.message.BasicNameValuePair; import org.apache.http.util.EntityUtils;import java.io.IOException; import java.io.UnsupportedEncodingException; import java.util.ArrayList; import java.util.List;public class HttpPostParamTest {public static void main(String[] args) throws Exception {//創建HttpClient對象CloseableHttpClient httpClient = HttpClients.createDefault();//創建HttpPost對象，設置url訪問地址HttpPost httpPost = new HttpPost("http://yun.itheima.com/search");//聲明List集合，封裝表單中的參數List<NameValuePair> params = new ArrayList<NameValuePair>();//設置請求地址是：http://yun.itheima.com/search?keys=Javaparams.add(new BasicNameValuePair("keys","Java"));//創建表單的Entity對象,第一個參數就是封裝好的表單數據，第二個參數就是編碼UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(params,"utf8");//設置表單的Entity對象到Post請求中httpPost.setEntity(formEntity);CloseableHttpResponse response = null;try {//使用HttpClient發起請求，獲取responseresponse = httpClient.execute(httpPost);//解析響應if (response.getStatusLine().getStatusCode() == 200) {String content = EntityUtils.toString(response.getEntity(), "utf8");System.out.println(content.length());}} catch (IOException e) {e.printStackTrace();}finally {//關閉responsetry {response.close();} catch (IOException e) {e.printStackTrace();}try {httpClient.close();} catch (IOException e) {e.printStackTrace();}}} }

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