java httpclient post json body example

以下是Java HttpClient发送POST请求并附带JSON Body的示例代码：

import java.io.IOException;
import org.apache.http.HttpEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.ContentType;
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 HttpClientPostJsonExample {
    public static void main(String[] args) throws IOException {
        CloseableHttpClient httpClient = HttpClients.createDefault();
        try {
            // 创建POST请求
            HttpPost httpPost = new HttpPost("http://example.com/api/test");
            // 添加请求头信息
            httpPost.addHeader("Accept", "application/json");
            httpPost.addHeader("Content-type", "application/json");
            // 设置JSON Body
            String jsonBody = "{\"key\":\"value\"}";
            StringEntity entity = new StringEntity(jsonBody, ContentType.APPLICATION_JSON);
            httpPost.setEntity(entity);
            // 发送请求并获取响应
            CloseableHttpResponse response = httpClient.execute(httpPost);
            try {
                // 解析响应结果
                HttpEntity responseEntity = response.getEntity();
                String responseBody = EntityUtils.toString(responseEntity);
                System.out.println(responseBody);
            } finally {
                // 关闭响应
                response.close();
        } finally {
            // 关闭httpClient
            httpClient.close();
该示例中，我们首先创建一个HttpClient实例，然后创建一个HttpPost实例，设置请求头信息以及JSON Body，并发送请求。最后获取响应并解析响应结果。