servlet运行“/*”引起的java.lang.StackOverflowError

1     <servlet>
2         <servlet-name>login</servlet-name>
3         <servlet-class>com.jd.login.UI.LoginUIServlet</servlet-class>
4     </servlet>
5     <servlet-mapping>
6         <servlet-name>login</servlet-name>
7         <url-pattern>/*</url-pattern>
8     </servlet-mapping>

若将servlet的url-pattern配置为“/*”时会拦截内部所有请求，使所有请求都由com.jd.login.UI.LoginUIServlet来处理，所以当项目跑起来后会出现栈溢出错误：java.lang.StackOverflowError

 1 @WebServlet(name = "LoginUIServlet",value="/servlet/LoginUIServlet")
 2 public class LoginUIServlet extends HttpServlet {
 3     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 4        //出现死循环，因为所有请求都被拦截
 5        request.getRequestDispatcher("/WEB-INF/pages/login.jsp").forward(request,response);
 6     }
 7 
 8     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 9         this.doPost(request,response);
10     }
11 }

栈溢出异常如下：

解决：

将web.xml中的servlet的url-pattern配置为具体的路径

1     <servlet>
2         <servlet-name>login</servlet-name>
3         <servlet-class>com.jd.login.UI.LoginUIServlet</servlet-class>
4     </servlet>
5     <servlet-mapping>
6         <servlet-name>login</servlet-name>
7         <url-pattern>/servlet/LoginUIServlet</url-pattern>
8     </servlet-mapping>

检验：

在浏览器中输入localhost/servlet/LoginUIServlet，结果如下