java http post json 对象请求

在Java中，发送HTTP POST请求携带JSON对象通常会涉及到`HttpURLConnection`, `HttpClient`, 或者第三方库如`org.apache.http.client`或`com.squareup.okhttp`等。这里以`HttpClient`为例说明：

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 com.google.gson.Gson; // 使用Gson将Java对象转为JSON字符串

public CloseableHttpResponse sendPostJson(String url, YourJsonObject obj) throws Exception {
    CloseableHttpClient httpClient = HttpClients.createDefault();
    HttpPost httpPost = new HttpPost(url);

    Gson gson = new Gson(); // 创建一个Gson实例
    String jsonContent = gson.toJson(obj); // 将YourJsonObject转换为JSON字符串

    httpPost.setEntity(new StringEntity(jsonContent, "application/json")); // 设置POST体为JSON

    // 添加其他头信息如Content-Type如果需要的话
    httpPost.setHeader("Content-Type", "application/json");

    CloseableHttpResponse response = httpClient.execute(httpPost);
    try {
        // 处理响应...
    } finally {
        response.close();
        httpClient.close();
    }
}

// YourJsonObject 类型需要你自己定义，例如：
class YourJsonObject {
    private String field1;
    private int field2;

    // getters and setters...
}