我已经尽一切努力使该servlet正常工作，并且在下载了几个较旧的JRE和Apache tomcat的多个较旧版本之后，它仍然无法正常工作。现在，我正在将开普勒Java EE与JRE v1.7和Tomcat v7结合使用。以下是我的Java源代码和html-我怀疑问题出在doGet方法本身，因为我认为文件路径已正确命名，但我仍返回空白页。尽管问题可能出在表单动作上-我完全不了解日食。
<!DOCTYPE html>
<html>
<head> <meta charset="ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<form action="/HelloWorld/HelloServlet" method="get">
<input type="submit" value="go to hello servlet"/>
</form>
</body>
</html>`
HelloServaled.java
package com.tutorials.servlets;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class HelloServlet
*/
@WebServlet("/HelloServlet")
public class HelloServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public HelloServlet() {
super();
// TODO Auto-generated constructor stub
}
/* @see Servlet#destroy()
*/
public void destroy() {
// TODO Auto-generated method stub
}
/**
* @see HttpServlet#service(HttpServletRequest request, > HttpServletResponse response)
*/
protected void service(HttpServletRequest request, HttpServletResponse > response) throws ServletException, IOException {
// TODO Auto-generated method stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, > HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse > response) throws ServletException, IOException {
PrintWriter out = response.getWriter();
out.println("I am in go get mehtod" );
// TODO Auto-generated method stub
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, > HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse > response) throws ServletException, IOException {
// TODO Auto-generated method stub
}
/**
* @see HttpServlet#doPut(HttpServletRequest, HttpServletResponse)
*/
protected void doPut(HttpServletRequest request, HttpServletResponse > response) throws ServletException, IOException {
// TODO Auto-generated method stub
}
}
最佳答案
您的主要问题在于表单的action属性与servlet的映射不同而导致的不匹配。
您的注释：（@WebServlet("/HelloServlet")）告诉应用程序服务器侦听对“ / HelloServlet”的请求，例如：http://eample.com/HelloServlet。
另一方面，您的表单将其操作设置为/HelloWorld/HelloServlet，这意味着发布请求转到了http://example.com/HelloWorld/HelloServlet
因此，当您的浏览器发布到那里时，应用程序会按应有的方式处理它，而不是应有的处理，因为您的servlet不在那儿监听任何内容。