Question

尝试创建一个新的servlet ....但是收到错误

HTTP状态500 - 实例化servlet类时出错

我的servlet类看起来像

package com.example.tutorial;

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;

@WebServlet(description = "Test servlet this is", urlPatterns = { "/servletexample" })
public class ServletExample extends HttpServlet {
private static final long serialVersionUID = 1L;

public ServletExample() {
    super();
}

protected void service(HttpServletRequest request,
        HttpServletResponse response) throws ServletException, IOException {
    PrintWriter out = response.getWriter();
    out.println("Testing servlet !!!");
}

}

我的web.xml如下：

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
  <display-name>ServletJSPExample</display-name>
  <welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
  </welcome-file-list>

  <servlet>
    <servlet-name>ServletExample</servlet-name>
    <servlet-class>com.example.tutorial.ServletExample</servlet-class>
  </servlet>

  <servlet-mapping>
    <servlet-name>ServletExample</servlet-name>
    <url-pattern>/servletexample</url-pattern>
  </servlet-mapping>

</web-app>

不知道发生了什么......会感激帮助.....

Answer 1

您可以删除注释或web.xml映射。

如果您需要两种方法，则应类似于以下内容：

@WebServlet(name = "ServletExample", urlPatterns = {"/servletExample"})
public class ServletExample extends HttpServlet {
....
}

并且web.xml中的映射应为：

<servlet>
    <servlet-name>ServletExample</servlet-name>
    <servlet-class>com.example.tutorial.ServletExample</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>ServletExample</servlet-name>
    <url-pattern>/servletExample</url-pattern>
</servlet-mapping>

我认为您错过了＆＃34; 名称＆＃34; @WebServlet注释中的属性。把它再试一次。

实例化servlet类时出错 - HTTP状态500

1 个答案: