老师您好，在练习时重定向到getRequestData页面一直提示404，麻烦帮忙看下是什么原因导致的，谢谢！
package com.itbaizhan.filter;
import javax.servlet.*;
import java.io.IOException;
/**
* 设置请求编码过滤器
*/
public class EncodingFilter implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
//设置请求编码
servletRequest.setCharacterEncoding("utf-8");
filterChain.doFilter(servletRequest,servletResponse);
}
@Override
public void destroy() {
}
}<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<form action="/getRequestData.do" method="post">
用户名：<input type="text" name="username"/><br/>
密码：<input type="password" name="userpwd"/><br/>
爱好：<input type="checkbox" name="userlike" value="Sport"/>体育
<input type="checkbox" name="userlike" value="Music"/>音乐
<input type="checkbox" name="userlike" value="Art"/>艺术<br/>
<input type="submit" value="OK">
</form>
</body>
</html>
<servlet>
<servlet-name>getRequestDataServlet</servlet-name>
<servlet-class>com.itbaizhan.GetRequestDataServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>getRequestDataServlet</servlet-name>
<url-pattern>/getRequestData.do</url-pattern>
</servlet-mapping>
package com.itbaizhan;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.*;
public class GetRequestDataServlet extends HttpServlet {
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//设置请求编码
// req.setCharacterEncoding("utf-8");
//获取用户名
String username = req.getParameter("username");
System.out.println(username);
//设置请求编码2
/*String name=new String(username.getBytes("ISO-8859-1"),"UTF-8");
System.out.println(name);*/
//获取用户密码
String userpwd = req.getParameter("userpwd");
//获取复选框的值
String[] userlikes = req.getParameterValues("userlike");
List<String> list= Arrays.asList(userlikes);
//获取表单中的所有keys
Enumeration<String> parameterNames = req.getParameterNames();
List<String> paralist=new ArrayList<>();
while(parameterNames.hasMoreElements()){
paralist.add(parameterNames.nextElement());
}
//使用Map结构获取提交数据
Map<String, String[]> parameterMap = req.getParameterMap();
Iterator<Map.Entry<String,String[]>> iterator =parameterMap.entrySet().iterator();
resp.setContentType("text/plain;charset=utf-8");
PrintWriter pw = resp.getWriter();
pw.println("UserName:"+username);
pw.println("PassWord:"+userpwd);
pw.println("UserLike:"+list);
pw.println("Names:"+paralist);
while(iterator.hasNext()){
Map.Entry<String,String[]> entry=iterator.next();
String key=entry.getKey();
String[] value=entry.getValue();
pw.println(key+"="+Arrays.asList(value));
}
pw.flush();
pw.close();
}
}
这个是什么原因？
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