java发送post请求 格式为 application/json 请求头为Authorization: Basic Auth

在Java中发送POST请求格式为`application/json`并且请求头中包含`Authorization: Basic Auth`可以通过多种方式实现，下面使用Java标准库中的`HttpURLConnection`类来演示如何进行这样的操作：

1. 导入必要的包：

import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.nio.charset.StandardCharsets;
import java.util.Base64;

2. 编写发送请求的代码：

public class HttpPostExample {
    public static void sendPostRequest(String targetUrl, String jsonPayload) {
        try {
            // 将json字符串转换为字节数组
            byte[] input = jsonPayload.getBytes(StandardCharsets.UTF_8);

            // 创建URL对象
            URL url = new URL(targetUrl);
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();

            // 设置请求方法为POST
            connection.setRequestMethod("POST");
            
            // 设置请求头
            connection.setRequestProperty("Content-Type", "application/json");
            connection.setRequestProperty("Authorization", "Basic " + encodeCredentials("username", "password"));

            // 允许输出
            connection.setDoOutput(true);

            // 发送请求体
            try (OutputStream os = connection.getOutputStream()) {
                os.write(input, 0, input.length);
            }

            // 检查响应码
            int responseCode = connection.getResponseCode();
            System.out.println("Response Code : " + responseCode);

            // 根据响应码处理响应内容
            if (responseCode == HttpURLConnection.HTTP_OK) {
                // 处理响应内容
                // ...
            } else {
                // 处理错误
                // ...
            }

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

    private static String encodeCredentials(String username, String password) {
        String userpass = username + ":" + password;
        byte[] encodedAuth = Base64.getEncoder().encode(userpass.getBytes(StandardCharsets.ISO_8859_1));
        return new String(encodedAuth, StandardCharsets.ISO_8859_1);
    }

    public static void main(String[] args) {
        String targetUrl = "http://your-api-endpoint.com/post";
        String jsonPayload = "{\"key1\":\"value1\",\"key2\":\"value2\"}";
        sendPostRequest(targetUrl, jsonPayload);
    }
}

注意替换`username`和`password`为实际的用户名和密码，`targetUrl`为你的API端点地址，以及`jsonPayload`为你需要发送的JSON格式的数据。