使用HttpURLConnection在Request body中发送数据 [英] Send data in Request body using HttpURLConnection

问题描述

我正在使用 HttpURLConnection 向使用JAVA Spark创建的本地部署的本地服务发出POST请求。我想在请求正文中发送一些数据当我使用HttpURLConnection进行POST调用时，但每次JAVA Spark中的请求主体为空。下面是我正在使用的代码

I am using HttpURLConnection to make a POST request to a local service deployed in my local created using JAVA Spark.I want to send some data in request body when I make the POST call using the HttpURLConnection but every time the request body in JAVA Spark is null. Below is the code I am using for this

post（/，（req，res） - > {
System.out.println（Request Body：+ req.body（））;
返回Hello !!!! ;
}）;

`public class HTTPClassExample{
   public static void main(String[] args) {
        try{
            URL url = new URL("http://localhost:4567/");
            HttpURLConnection httpCon = (HttpURLConnection) url.openConnection();
            httpCon.setDoOutput(true);
            httpCon.setRequestMethod("POST");
            httpCon.connect();
            OutputStream os = httpCon.getOutputStream();
            OutputStreamWriter osw = new OutputStreamWriter(os, "UTF-8");    
            osw.write("Just Some Text");
            System.out.println(httpCon.getResponseCode());
            System.out.println(httpCon.getResponseMessage());
            osw.flush();
            osw.close();  
        }catch(Exception ex){
            ex.printStackTrace();
        }
    }
}`

推荐答案

只有在体内而不是之前编写参数后才能调用 httpCon.connect（）; 。您的代码应如下所示：

You should call httpCon.connect(); only after you write your parameters in the body and not before. Your code should look like this:

URL url = new URL("http://localhost:4567/");
HttpURLConnection httpCon = (HttpURLConnection) url.openConnection();
httpCon.setDoOutput(true);
httpCon.setRequestMethod("POST");
OutputStream os = httpCon.getOutputStream();
OutputStreamWriter osw = new OutputStreamWriter(os, "UTF-8");    
osw.write("Just Some Text");
osw.flush();
osw.close();
os.close();  //don't forget to close the OutputStream
httpCon.connect();

//read the inputstream and print it
String result;
BufferedInputStream bis = new BufferedInputStream(conn.getInputStream());
ByteArrayOutputStream buf = new ByteArrayOutputStream();
int result2 = bis.read();
while(result2 != -1) {
    buf.write((byte) result2);
    result2 = bis.read();
}
result = buf.toString();
System.out.println(result);

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