JAVA利用HttpClient发送http请求

「爱情、让人受尽委屈。」 2022-06-18 02:16 362阅读 0赞

[HttpClient官网][HttpClient]  
这里只是给自己做个笔记，记住有这个东西，看到此文章的人建议去官网学习使用  
下面是官网简单的例子：

package org.apache.hc.client5.http.examples;
    
    import java.io.IOException;
    
    import org.apache.hc.client5.http.impl.sync.CloseableHttpClient;
    import org.apache.hc.client5.http.impl.sync.HttpClients;
    import org.apache.hc.client5.http.methods.HttpGet;
    import org.apache.hc.client5.http.protocol.ClientProtocolException;
    import org.apache.hc.client5.http.sync.ResponseHandler;
    import org.apache.hc.core5.http.HttpEntity;
    import org.apache.hc.core5.http.HttpResponse;
    import org.apache.hc.core5.http.ParseException;
    import org.apache.hc.core5.http.entity.EntityUtils;
    
    /** * This example demonstrates the use of the {@link ResponseHandler} to simplify * the process of processing the HTTP response and releasing associated resources. */
    public class ClientWithResponseHandler {
    
        public final static void main(String[] args) throws Exception {
            try (CloseableHttpClient httpclient = HttpClients.createDefault()) {
                HttpGet httpget = new HttpGet("http://httpbin.org/get");
    
                System.out.println("Executing request " + httpget.getRequestLine());
    
                // Create a custom response handler
                ResponseHandler<String> responseHandler = new ResponseHandler<String>() {
    
                    @Override
                    public String handleResponse(
                            final HttpResponse response) throws IOException {
                        int status = response.getStatusLine().getStatusCode();
                        if (status >= 200 && status < 300) {
                            HttpEntity entity = response.getEntity();
                            try {
                                return entity != null ? EntityUtils.toString(entity) : null;
                            } catch (ParseException ex) {
                                throw new ClientProtocolException(ex);
                            }
                        } else {
                            throw new ClientProtocolException("Unexpected response status: " + status);
                        }
                    }
    
                };
                String responseBody = httpclient.execute(httpget, responseHandler);
                System.out.println("----------------------------------------");
                System.out.println(responseBody);
            }
        }
    
    }

MAVEN依赖：

<dependency>                                                                                    <groupId>org.apache.httpcomponents.client5</groupId>
    <artifactId>httpclient5</artifactId>
    <version>5.0-alpha1</version>
    </dependency>

[HttpClient]: http://hc.apache.org