java类过滤器，防止页面SQL注入

来源：互联网发布：java redis实战 pdf 编辑：程序博客网时间：2024/04/29 20:08
转自：http://www.oschina.net/code/snippet_811941_14131
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;    }}  <!--在web.xml文件中的配置--><!-- 防止SQL注入的过滤器 -->    <filter>        <filter-name>antiSqlInjection</filter-name>        <filter-class>com.tarena.dingdang.filter.AntiSqlInjectionfilter</filter-class>    </filter>    <filter-mapping>        <filter-name>antiSqlInjection</filter-name>        <url-pattern>/*</url-pattern>    </filter-mapping>
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