java post httpclient模拟post请求 json

您也可以使用Apache HttpClient库来模拟发送POST请求，并将JSON数据作为请求体发送。以下是一个示例代码：

import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.HttpClientBuilder;
import java.io.BufferedReader;
import java.io.InputStreamReader;

public class PostJsonRequest {
    public static void main(String[] args) {
        try {
            // 设置请求URL和JSON数据
            String url = "http://example.com/api";
            String json = "{\"name\": \"John\", \"age\": 30}";

            // 创建HttpClient和HttpPost对象
            HttpClient client = HttpClientBuilder.create().build();
            HttpPost post = new HttpPost(url);

            // 将JSON数据作为请求体发送
            StringEntity entity = new StringEntity(json);
            post.setEntity(entity);
            post.setHeader("Content-type", "application/json");
            post.setHeader("Accept", "application/json");

            // 发送请求并获取响应
            HttpResponse response = client.execute(post);

            // 打印响应内容
            BufferedReader rd = new BufferedReader(
                    new InputStreamReader(response.getEntity().getContent()));
            String line = "";
            while ((line = rd.readLine()) != null) {
                System.out.println(line);
            }

        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

在上述示例中，我们使用了Apache HttpClient库来创建HttpClient和HttpPost对象，并将JSON数据作为请求体发送。注意：在实际使用时，您需要将URL和JSON数据替换为实际的值。