servlet映射的问题,HTTP Status-404

index.jsp

web.xml
<?xml version="1.0" encoding="UTF-8"?>

filter
com.May_8

filter
/*

word
com.NoteServlet

word
/NoteWord

NoteServlet.java
package com;

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;

/**

Servlet implementation class NoteServlet
*/
@WebServlet("/NoteServlet")
public class NoteServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public NoteServlet() {
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("UTF-8");
PrintWriter out=response.getWriter();
out.println();
out.close();
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html;charset=utf-8");
PrintWriter out = response.getWriter();
out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("");
out.println("
A Servlet");
out.println(" ");
```
String name = request.getParameter("username");
if(name==null || name.trim().length()<=0){
    out.println("å��å—ä¸�èƒ½ä¸ºç©º!!!");
}else{
    String words = request.getParameter("name");
    out.println("<br/>"+name+"çš„ç•™è¨€æ˜¯:<br/>"+ words);
}
out.println("  </BODY>");
out.println("</HTML>");
out.flush();
out.close();
```
}

}
May_8.java
package com;

import java.io.IOException;
import java.util.List;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import com.WordUtil;
public class May_8 implements Filter{

public void init(FilterConfig arg0) throws ServletException {   
}
public void destroy(){  
}
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
        throws IOException, ServletException {
request.setCharacterEncoding("UTF-8");
MyRequest req=new MyRequest((HttpServletRequest)request);
chain.doFilter(req, response);

}

class MyRequest extends HttpServletRequestWrapper

{

    public MyRequest(HttpServletRequest request) {
        super(request);

    }
    public String getParameter(String name){
        String str=super.getParameter(name);
        List<String>list=WordUtil.getWord();
        for(String word:list){
            str=str.replace(word,"*");
        }
        return str;
    }
}

}
图片说明

路径不对，你右击index.jsp 选最后一个看一下路径，你ma y_8下面没有NoteWord，把NoteWord去了，再试试，或者去了加上index.jsp试试

你是在web.xml文件当中配置了并且使用了Webservlet标签是么？如果是的话你可以试试把标签去掉