第一个servlet运行报错
来源:2-1 第一个Servlet
慕神8512947
2021-06-08 17:25:28
出现这个报错的原因是?
package com.imooc.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
;
public class SecondServlet extends HttpServlet{
@Override
protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//接收请求发来的参数
String name=request.getParameter("name");
String html="<h1 style='color:red'>hi," + name + "!</h1><hr/>";
System.out.println("返回给浏览器的相应数据为:"+html);
PrintWriter out= response.getWriter();//服务器向浏览器返回的输出流
out.println(html); //将html发送给浏览器
}
}
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
<display-name>SecondServlet</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>
<!-- 声明Servlet -->
<servlet>
<!-- servlet别名 -->
<servlet-name>second</servlet-name>
<servlet-class>com.imooc.servlet.SeconServlet</servlet-class>
</servlet>
<!-- 将Servlet与URL绑定 -->
<servlet-mapping>
<servlet-name>second</servlet-name>
<url-pattern>/hi</url-pattern> <!-- http://localhost:8080/SecondServlet/hi -->
</servlet-mapping>
</web-app>
1回答
好帮手慕小尤
2021-06-08
同学你好,在web.xml中类名书写错误,导致代码在运行时没有找到对应的类,从而出现异常。则建议同学修改类名。如下所示:
然后清除缓存,重新运行试一下。
祝学习愉快!
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