In the web. The XML file to add the following code words all pages cannot directly from IDEA upper right to access, remove after can access,

 & lt; Servlet> 
 HelloServlet 
 Com. Example. MyWebsite. HelloServlet 
 
 
 HelloServlet 
/hello 
 

Behind try many times, found that in fact is the mapping problem, to the point after the mapping can normal visit, excuse me what reason be, will be the servlet write

 package com. Example. MyWebsite; 

Import the Java. IO. *; 
The import javax.mail. Servlet. ServletConfig; 
import javax.servlet.ServletException; 
The import javax.mail. Servlet. HTTP. *; 
The import javax.mail. Servlet. The annotation. *; 

@ WebServlet (name="helloServlet" value="https://bbs.csdn.net/hello-servlet") 
Public class HelloServlet extends the HttpServlet {
private String message; 

Public void init (ServletConfig config) throws ServletException {

} 

Public void doGet (it request, HttpServletResponse response) throws IOException, ServletException {
String name=request. The getParameter (" name "); 
response.setContentType("text/html; charset=utf-8"); 
PrintWriter out=response. GetWriter (); 
Out.println (" & lt; Html>" + 
"& lt; head>