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package com.tarena.dingdang.filter; import java.io.IOException; import java.util.Enumeration; 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; public class AntiSqlInjectionfilter implements Filter { public void destroy() { // TODO Auto-generated method stub } public void init(FilterConfig arg0) throws ServletException { // TODO Auto-generated method stub } public void doFilter(ServletRequest args0, ServletResponse args1, FilterChain chain) throws IOException, ServletException { HttpServletRequest req=(HttpServletRequest)args0; HttpServletRequest res=(HttpServletRequest)args1; //获得所有请求参数名 Enumeration params = req.getParameterNames(); String sql = ""; while (params.hasMoreElements()) { //得到参数名 String name = params.nextElement().toString(); //System.out.println("name===========================" + name + "--"); //得到参数对应值 String[] value = req.getParameterValues(name); for (int i = 0; i < value.length; i++) { sql = sql + value[i]; } } //System.out.println("============================SQL"+sql); //有sql关键字，跳转到error.html if (sqlValidate(sql)) { throw new IOException("您发送请求中的参数中含有非法字符"); //String ip = req.getRemoteAddr(); } else { chain.doFilter(args0,args1); } } //效验 protected static boolean sqlValidate(String str) { str = str.toLowerCase();//统一转为小写 String badStr = "'|and|exec|execute|insert|select|delete|update|count|drop|*|%|chr|mid|master|truncate|" + "char|declare|sitename|net user|xp_cmdshell|;|or|-|+|,|like'|and|exec|execute|insert|create|drop|" + "table|from|grant|use|group_concat|column_name|" + "information_schema.columns|table_schema|union|where|select|delete|update|order|by|count|*|" + "chr|mid|master|truncate|char|declare|or|;|-|--|+|,|like|//|/|%|#";//过滤掉的sql关键字，可以手动添加 String[] badStrs = badStr.split("\\|"); for (int i = 0; i < badStrs.length; i++) { if (str.indexOf(badStrs[i]) >= 0) { return true; } } return false; } } antiSqlInjection com.tarena.dingdang.filter.AntiSqlInjectionfilter antiSqlInjection /*
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