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使用过滤器是解决sql注入的一种方式，其它可以前端校验处理等

过滤器写法：

package XXX.utils;import javax.servlet.*;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.IOException;import java.util.Enumeration;/** * sql注入过滤器 * @Date 2020/12/24 **/public class SqlInjectionFilter implements Filter{    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {        HttpServletRequest req = (HttpServletRequest) request;        HttpServletResponse res = (HttpServletResponse) response;        //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");        } else {            chain.doFilter(req, res);        }    }    //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";        String badStr = "'|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]) !=-1) {                return true;            }        }        return false;    }    public void init(FilterConfig filterConfig) throws ServletException {        //throw new UnsupportedOperationException("Not supported yet.");    }    public void destroy() {        //throw new UnsupportedOperationException("Not supported yet.");    }}

web.xml中做配置 

       
    
     SqlInjectionFilter
        
    
     com.hnac.hzinfo.common.utils.SqlInjectionFilter
      
     
       
    
     SqlInjectionFilter
        
    
     /*
      
   

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