防止sql注入过滤器

package com.tgisserver.cloud.jpamanager.common.filter;

import java.io.IOException;
import java.util.Enumeration;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

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.annotation.WebFilter;

import org.springframework.context.annotation.Configuration;

/**

• @author zzj

• @date 2022年05月23日 14:39

• des 防止SQL注入过滤器，如果正则匹配结果是false则返回异常信息
  /
  @WebFilter(urlPatterns = "/“, filterName = “sqlFilter”)
  @Configuration
  public class SqlFilter implements Filter {
  private static final Pattern PATTERN = Pattern.compile(”b(sands|sexecs|sinserts|sselects|sdrops|sgrants|salters|s*" +
  “deletes*|supdates|scounts|schrs|smids|smasters|struncates|schars|sdeclares|sors)b|(*|;|+)”);

  @Override
  public void init(FilterConfig filterConfig) throws ServletException {

  }

  @Override
  public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)
  throws IOException, ServletException {
  ServletRequest request = servletRequest;
  ServletResponse response = servletResponse;
  // 获得所有请求参数名
  Enumeration names = request.getParameterNames();
  String sql = “”;
  while (names.hasMoreElements()) {
  // 得到参数名
  String name = names.nextElement().toString();
  // 得到参数对应值
  String[] values = request.getParameterValues(name);
  for (int i = 0; i < values.length; i++) {
  sql += values[i];
  }
  }
  if (sqlValidate(sql)) {
  throw new IOException(“您发送请求中的参数中含有非法字符”);
  } else {
  filterChain.doFilter(request, response);
  }
  }

  // 效验
  protected static boolean sqlValidate(String str) {
  String s = str.toLowerCase();// 统一转为小写

   // 使用正则表达式进行匹配
   Matcher matcher = PATTERN.matcher(s);
  
   return matcher.find();
  

  }

  @Override
  public void destroy() {

  }
  }