Question

我在eclipse的java文件中编写了以下代码，看了一个教程。当我尝试在服务器上运行它时它会显示我

Http: 404 error
Type Status Report

Description The origin server did not find a current representation for the target resource or is not willing to disclose that one exists

我的代码是

package com.shaby.newservletdemo;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.Servlet;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

public class servletInterface implements Servlet{
    ServletConfig servletConfig= null;
    @Override
    public void destroy() {
        // TODO Auto-generated method stub
        System.out.println("Servlet Destroyed.");
    }

    @Override
    public ServletConfig getServletConfig() {
        // TODO Auto-generated method stub
        return servletConfig;
    }

    @Override
    public String getServletInfo() {
        // TODO Auto-generated method stub
        return "Version 1. 2016-2019";
    }

    @Override
    public void init(ServletConfig arg0) throws ServletException {
        // TODO Auto-generated method stub
        this.servletConfig= arg0;
        System.out.println("Servlet Initialized");
    }

    @Override
    public void service(ServletRequest arg0, ServletResponse arg1) throws ServletException, IOException {
        // TODO Auto-generated method stub
        arg1.setContentType("text/html");
        PrintWriter pw= arg1.getWriter();

        pw.println("<html><body>");
        pw.println("Hello Service has been done!!");
        pw.println("</body></html>");
    }

}

执行部分有什么问题或我错过了什么？我在Eclipse IDE上运行它。我正在使用Tomcat 9服务器。

的web.xml

<?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>servletsdemo</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>servletInterface</servlet-name>
        <servlet-class>servletInterface</servlet-class>
    </servlet>

    <servlet-mapping>
        <servlet-name>servletInterface</servlet-name>
        <url-pattern>/servletInterface</url-pattern>
    </servlet-mapping>
</web-app>

Answer 1

您是否配置了web.xml？

应该有像

这样的东西

<servlet-mapping>
   <servlet-name>servletInterface</servlet-name>
   <url-pattern>/servletInterface</url-pattern>
</servlet-mapping>

在其中。

另外，你应该扩展HttpServlet而不是Servlet。

Answer 2

404状态代码表示服务器无法找到所请求的资源。请检查您是否已将请求uri映射到servlet，并在web.xml中正确包含servlet和classname。

Answer 3

我认为你应该实现抽象类import com.pocketfeeds.app1.R。

该类的特定包（如果需要）：

javax.servlet.http.HttpServlet

请参阅示例：Servlet Tutorials

运行servlet显示错误

3 个答案: