java代码发送body参数。

jar

    com.alibaba
    fastjson
    1.2.21

public static String post(String requestUrl, JSonObject parm) throws Exception{
    //响应的内容
    StringBuffer stringBuffer = new StringBuffer();
    URL url = new URL(requestUrl);
    HttpURLConnection connection = (HttpURLConnection)url.openConnection();
    connection.setRequestMethod("POST");//请求post方式
    connection.setDoInput(true);
    connection.setDoOutput(true);

    //header内的的参数在这里设置  setRequestProperty("健, "值");
    connection.setRequestProperty("Content-Type", "application/json");
    //connection.setRequestProperty("", "");
    connection.connect();
    OutputStreamWriter outputStreamWriter = new OutputStreamWriter(connection.getOutputStream(),"UTF-8");

    outputStreamWriter.write(parm.toString());
    outputStreamWriter.flush();
    InputStream inputStream = connection.getInputStream();
    BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"));
    String strRead = null;
    while ((strRead = bufferedReader.readLine()) != null) {
        stringBuffer.append(strRead);
        stringBuffer.append("rn");
    }
    bufferedReader.close();
    connection.disconnect();
    String results = stringBuffer.toString();
    return results;
}

参考： https://blog.csdn.net/weixin_42620563/article/details/114235588