Question

我的Servlets计划

package com.srccode.example;
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  Jaan implements Servlet{  
ServletConfig config=null;  

public void init(ServletConfig config){  
this.config=config;  
System.out.println("servlet is initialized");  
}  

public void service(ServletRequest req,ServletResponse res)  
throws IOException,ServletException{  

res.setContentType("text/html");  

PrintWriter out=res.getWriter();  
out.print("<html><body>");  
out.print("<b>hello simple servlet</b>");  
out.print("</body></html>");  

}  
public void destroy(){System.out.println("servlet is destroyed");}  
public ServletConfig getServletConfig(){return config;}  
public String getServletInfo(){return "copyright 2007-1010";}  

}

更新

<?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" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" 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>HelloWorldServlets</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>
</web-app>

在Tomcat服务器上部署此程序时，显示404错误原因何在？我的代码中是否有任何错误。浏览器屏幕截图中的错误是 - ＆gt; http://i.stack.imgur.com/CuPuy.png。解决这个问题

Answer 1

您尚未使用Servlet配置web.xml。

<servlet>
    <description></description>
    <display-name>Jaan</display-name>
    <servlet-name>Jaan</servlet-name>
    <servlet-class>com.srccode.example.Jaan</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>Jaan</servlet-name>
    <url-pattern>/Jaan</url-pattern>
  </servlet-mapping>

Answer 2

将此添加到您的web.xml。

      <servlet>
        <servlet-name>Jaan</servlet-name>
        <servlet-class>com.srccode.example.Jaan</servlet-class>
      </servlet>
      <servlet-mapping>
        <servlet-name>Jaan</servlet-name>
        <url-pattern>/Jaan</url-pattern>
      </servlet-mapping>

这将映射网址 - ＆gt; localhost:8080/HelloWorldServlets/Jaan到您的servlet Jaan

部署我的Servlets程序时显示404错误

2 个答案: