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HttpClient.Post请求

HttpPost请求响应的一般步骤：

无参

package cn.csdn.crawlar.test;import org.apache.http.client.methods.CloseableHttpResponse;import org.apache.http.client.methods.HttpPost;import org.apache.http.client.utils.URIBuilder;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) throws Exception {           //创建HttpClient对象        CloseableHttpClient httpClient = HttpClients.createDefault();        //设置请求地址是：https://www.icourse163.org/search.htm?search=java#/        //创建URI地址        String string="https://www.icourse163.org/search.htm";        URIBuilder uriBuilder = new URIBuilder( string );        //设置参数        String param="search",value="java";        uriBuilder.setParameter(param,value );        //创建HttpPost对象，设置url访问地址        HttpPost httpPost = new HttpPost(uriBuilder.build());        //发起请求        System.out.println("发起请求的信息"+httpPost);        //try/catch/finally : Ctrl+Alt+T        CloseableHttpResponse response = null;        try {               //使用HttpClient发起请求，获取response            response = httpClient.execute(httpPost);            //解析响应            if (response.getStatusLine().getStatusCode() == 200) {                   String content = EntityUtils.toString(response.getEntity(), "utf8");                System.out.println(content.length());            }        } catch (IOException e) {               e.printStackTrace();        } finally {               //关闭response            try {                   response.close();            } catch (IOException e) {                   e.printStackTrace();            }            try {                   httpClient.close();            } catch (IOException e) {                   e.printStackTrace();            }        }    }}

我们可以清晰地看出请求方法由Get变成了Post。

含参

package cn.csdn.crawlar.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.util.ArrayList;import java.util.List;public class HttpPostTest含参 {       public static void main(String[] args) throws Exception {           //创建HttpClient对象        CloseableHttpClient httpClient = HttpClients.createDefault();        //设置请求地址是：https://www.icourse163.org/search.htm?search=java#/        //创建URI地址        String string="https://www.icourse163.org/search.htm";        //创建HttpPost对象，设置url访问地址        HttpPost httpPost = new HttpPost(string);        //声明list集合，封装请求集合，封装表单中的参数        List
   
     params = new ArrayList
    
     ();        String name="search",value="java";        params.add(new BasicNameValuePair(name, value ) );        //创建表单的Entity对象        String charst="utf8";        UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(params,charst);        //设置表单Entity对象到POST请求中        httpPost.setEntity(formEntity);        //发起请求        System.out.println("发起请求的信息"+httpPost);        //try/catch/finally : Ctrl+Alt+T        CloseableHttpResponse response = null;        try {               //使用HttpClient发起请求，获取response            response = httpClient.execute(httpPost);            //解析响应            if (response.getStatusLine().getStatusCode() == 200) {                   String content = EntityUtils.toString(response.getEntity(), "utf8");                System.out.println(content.length());            }        } catch (IOException e) {               e.printStackTrace();        } finally {               //关闭response            try {                   response.close();            } catch (IOException e) {                   e.printStackTrace();            }            try {                   httpClient.close();            } catch (IOException e) {                   e.printStackTrace();            }        }    }}
    
   

点开网址链接就可以进入学习视频啦！

声明list集合，封装请求集合，封装表单中的参数创建表单的Entity对象设置表单Entity对象到POST请求中