java，http post请求，多个不同方式请求示例

谁借莪１个温暖的怀抱￠ 2023-10-10 16:38 9阅读 0赞

以下是 Java 中进行 HTTP POST 请求的示例代码，包括使用 HttpURLConnection 和 HttpClient 两种方式，供您参考。  
使用 HttpURLConnection 发送 POST 请求示例代码：

import java.io.BufferedReader;
    import java.io.DataOutputStream;
    import java.io.InputStreamReader;
    import java.net.HttpURLConnection;
    import java.net.URL;
    import java.nio.charset.StandardCharsets;
    public class HttpPostWithHttpURLConnection {
        
        public static void main(String[] args) throws Exception {
        
            String url = "http://httpbin.org/post";
            String data = "name=value";
            URL obj = new URL(url);
            HttpURLConnection con = (HttpURLConnection) obj.openConnection();
            con.setRequestMethod("POST");
            con.setRequestProperty("User-Agent", "Mozilla/5.0");
            con.setRequestProperty("Accept-Language", "en-US,en;q=0.5");
            con.setDoOutput(true);
            try (DataOutputStream wr = new DataOutputStream(con.getOutputStream())) {
        
                wr.write(data.getBytes(StandardCharsets.UTF_8));
            }
            try (BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()))) {
        
                String line;
                StringBuilder response = new StringBuilder();
                while ((line = in.readLine()) != null) {
        
                    response.append(line);
                }
                System.out.println(response.toString());
            }
        }
    }

使用 HttpClient 发送 POST 请求示例代码：

import org.apache.http.HttpEntity;
    import org.apache.http.client.methods.CloseableHttpResponse;
    import org.apache.http.client.methods.HttpPost;
    import org.apache.http.entity.StringEntity;
    import org.apache.http.impl.client.CloseableHttpClient;
    import org.apache.http.impl.client.HttpClients;
    import org.apache.http.util.EntityUtils;
    public class HttpPostWithHttpClient {
        
        public static void main(String[] args) throws Exception {
        
            String url = "http://httpbin.org/post";
            String data = "name=value";
            HttpPost httpPost = new HttpPost(url);
            httpPost.setHeader("Content-Type", "application/x-www-form-urlencoded");
            httpPost.setEntity(new StringEntity(data));
            try (CloseableHttpClient httpClient = HttpClients.createDefault();
                 CloseableHttpResponse response = httpClient.execute(httpPost)) {
        
                HttpEntity entity = response.getEntity();
                if (entity != null) {
        
                    System.out.println(EntityUtils.toString(entity));
                }
            }
        }
    }

需要注意的是，在实际使用中，需要根据具体需求设置请求头、请求参数等信息。另外，这里的示例代码中使用了 try-with-resources 语句来自动关闭资源，建议在实际使用中也使用这种方式来规避资源泄漏的风险。