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018. A shielding sensitive vocabulary made by proxy mode knot and filter

2022-07-18 00:50:00 【51CTO】

       
       <!DOCTYPE html>
       
<html lang="en">
       
<head>
       
  <meta charset="UTF-8">
       
  <title> Filter application example --- Sensitive word filtering </title>
       
</head>
       
<body>
       
<form action="noteServlet" method="post" accept-charset="UTF-8" >
       
   full name :<input type="text" name="name"> <br>
       
   Leaving a message. :<input type="text" name="note" ><br>
       
  <input type="submit" value=" Submit ">
       
</form>
       
</body>
       
</html>
      
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       package com.item.filter;
       
import javax.servlet.*;
       
import javax.servlet.annotation.WebFilter;
       
import javax.servlet.http.HttpServletRequest;
       
import javax.servlet.http.HttpServletResponse;
       
import java.io.*;
       
import java.lang.reflect.InvocationHandler;
       
import java.lang.reflect.Method;
       
import java.lang.reflect.Proxy;
       
import java.util.ArrayList;
       
import java.util.List;
       
/**
       
 * 1. analysis ：
       
 * 1.1  Yes request Object enhancement . Enhanced methods for obtaining parameters 
       
 * 1.2  release . Passing proxy objects 
       
 * 2. Filter sensitive words 
       
 */
       
@WebFilter("/*")
       
public class SenstiveWordsFilter implements Filter
       
{
       
    @Override
       
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException
       
    {
       
        /**
       
         * 1. Create proxy object , enhance getParameter Method 
       
         * 2. release 
       
         */
       
        ServletRequest proxyServletRequest = (ServletRequest) Proxy.newProxyInstance(servletRequest.getClass().getClassLoader(), servletRequest.getClass().getInterfaces(), new InvocationHandler()
       
        {
       
            @Override
       
            public Object invoke(Object proxy, Method method, Object[] args) throws Throwable
       
            {
       
                /**
       
                 * 1. enhance getParameter Method 
       
                 * 2. First of all, judge whether it is getParameter Method 
       
                 */
       
                if (method.getName().equals("getParameter"))
       
                {
       
                    /**
       
                     *   1. Enhanced return value 
       
                     *   2. Get the return value to filter the memorable words 
       
                     */
       
                    String value = (String) method.invoke(servletRequest, args);
       
                    if (value != null)
       
                    {
       
                        for (String str : list)
       
                        {
       
                            if (value.contains(str))
       
                            {
       
                                value = value.replaceAll(str, "**");
       
                            }
       
                        }
       
                    }
       
                    return value;
       
                }
       
                /**
       
                 * 1. If not, execute the method that is the object 
       
                 */
       
                return method.invoke(servletRequest, args);
       
            }
       
        });
       
        filterChain.doFilter(proxyServletRequest, servletResponse);
       
    }
       
    private List<String> list = new ArrayList<String>();// A collection of sensitive words 
       
    @Override
       
    public void init(FilterConfig filterConfig) throws ServletException
       
    {
       
        /**
       
         * 1. Add data vocabulary to list in 
       
         * 2. about Filter Medium init() The initialization method is executed only once , That is, initialize once 
       
         */
       
        list.add(" Idiot ");
       
        list.add(" Idiot ");
       
        list.add(" dumbass ");
       
    }
       
}
      
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       package com.item.servlet;
       
import javax.servlet.ServletException;
       
import javax.servlet.annotation.WebServlet;
       
import javax.servlet.http.HttpServlet;
       
import javax.servlet.http.HttpServletRequest;
       
import javax.servlet.http.HttpServletResponse;
       
import java.io.IOException;
       
@WebServlet("/noteServlet")
       
public class NoteServlet extends HttpServlet
       
{
       
    @Override
       
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException
       
    {
       
        doPost(req, resp);
       
    }
       
    @Override
       
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException
       
    {
       
        /**
       
         * 1. Solve the mess 
       
         */
       
        req.setCharacterEncoding("utf-8");
       
        resp.setContentType("text/html;charset=utf-8");
       
        String name=req.getParameter("name");
       
        String note = req.getParameter("note");
       
        resp.getWriter().write(name+" Your message is ："+note);
       
        System.out.println(name+":"+note);
       
    }
       
}
      
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版权声明
本文为[51CTO]所创，转载请带上原文链接，感谢
https://yzsam.com/2022/199/202207150954443011.html

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018. A shielding sensitive vocabulary made by proxy mode knot and filter

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