我想要一个代码从Java代码调用servlet。我的代码如下。Servlet没有被调用，

Question

package test;

import java.io.ObjectOutputStream;

import java.net.HttpURLConnection;

import java.net.URL;

public class Test {

public static void main(String[] args) {

    URL url;

    try {

        url = new URL("http://localhost:8081/Projectt/ServletTest");

        HttpURLConnection conn = (HttpURLConnection) url.openConnection();

        conn.setDoOutput(true);

        conn.setRequestMethod("POST");

        ObjectOutputStream out = new ObjectOutputStream(conn.getOutputStream());

        out.writeObject("test");

        out.flush();

        System.out.println("------------");

    } catch (Exception e) {

        // TODO Auto-generated catch block

        e.printStackTrace();

    }

}

}

这是我的servlet代码

import java.io.IOException;

import java.io.ObjectInputStream;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

@WebServlet("/ServletTest")

public class ServletTest extends HttpServlet {

     private static final long serialVersionUID = 1L;

     public ServletTest() {

         super();

     }

protected void doGet(HttpServletRequest request, HttpServletResponse response)

        throws ServletException, IOException {

    doPost(request,response);

}

protected void doPost(HttpServletRequest request, HttpServletResponse response)

        throws ServletException, IOException {

    ObjectInputStream in = new ObjectInputStream(request.getInputStream());

    try {

        System.out.println("In get : " + (String) in.readObject());

    } catch (ClassNotFoundException e) {

        e.printStackTrace();

    }

    System.out.println("End of servlet");

}

}

我想从Java代码中调用servlet。以上是我的代码。端口为8081。给定的URL是从浏览器中触发的，而不是从我的代码中触发的。仅从Test类而不是从TestServlet执行println语句

Answer 1

在您进行一些输入（即获取HttpURLConnection的输入流或获取响应代码）之前，什么都不会发生。您至少需要致电getResponseCode()。