过滤器过滤敏感字符

第一步
在src文件下新建过滤器文件filter，新建java文件，我取名Filter。
要导的包

package Filter;

import util.MyRequest2;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import java.io.*;
import java.util.Properties;
import java.util.Set;

第二步
配置xml文件或者注解
配置xml

    AFilter
    filter.AFilter


    BFilter
    filter.BFilter




    BFilter
    /filter.jsp



    AFilter
    /filter.jsp

常用配置项
urlPatterns
配置要拦截的资源

1. 以指定资源匹配。例如"/index.jsp"
2. 以目录匹配。例如"/servlet initParams = { @WebInitParam(name = "charset", value = "utf-8") })

   这里我是选择把这个项目中所有敏感字符过滤掉（ public void init(FilterConfig filterConfig) { } public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain){ } public void destroy() { }

   实现代码

   package Filter;
   
   import util.MyRequest2;
   
   import javax.servlet.*;
   import javax.servlet.annotation.WebFilter;
   import javax.servlet.http.HttpServletRequest;
   import java.io.*;
   import java.util.Properties;
   import java.util.Set;
   
   @WebFilter("
   private HttpServletRequest httpServletRequest;
   private List list = new ArrayList<>();
   
   public MyRequest(HttpServletRequest request,List list) {
       super(request);
       httpServletRequest = request;
       this.list = list;
   }
   
   @Override
   public String getParameter(String name) {
       String txt = httpServletRequest.getParameter(name);
       //
       if(txt!=null&&!txt.isEmpty()){
           for (int i=0;i 
   这就是过滤器过滤敏感字符的全部内容了