自定義一個wapper 實現 HttpServletRequestWrapper

package cn.baozun.crm.task.filter;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;

/**
 *
 * <p>xss過濾</p>
 * @author dexter.qin
 * @version $Id: XssHttpServletRequestWrapper.java, v 0.1 2014-2-27 下午2:28:30 qinde Exp $
 */
public class XssHttpServletRequestWrapper extends HttpServletRequestWrapper {
    HttpServletRequest orgRequest = null;

    public XssHttpServletRequestWrapper(HttpServletRequest request) {
        super(request);
        orgRequest = request;
    }

    /**
    * 覆蓋getParameter方法，將引數名和引數值都做xss過濾。<br/>
    * 如果需要獲得原始的值，則通過super.getParameterValues(name)來獲取<br/>
    * getParameterNames,getParameterValues和getParameterMap也可能需要覆蓋
    */
    @Override
    public String getParameter(String name) {
        String value = super.getParameter(xssEncode(name));
        if (value != null) {
            value = xssEncode(value);
        }
        return value;
    }

    /**
    * 覆蓋getHeader方法，將引數名和引數值都做xss過濾。<br/>
    * 如果需要獲得原始的值，則通過super.getHeaders(name)來獲取<br/>
    * getHeaderNames 也可能需要覆蓋
    */
    @Override
    public String getHeader(String name) {

        String value = super.getHeader(xssEncode(name));
        if (value != null) {
            value = xssEncode(value);
        }
        return value;
    }

    /**
    * 將容易引起xss漏洞的半形字元直接替換成全形字元
    *
    * @param s
    * @return
    */
    private static String xssEncode(String s) {
        if (s == null || "".equals(s)) {
            return s;
        }
        StringBuilder sb = new StringBuilder(s.length() + 16);
        for (int i = 0; i < s.length(); i++) {
            char c = s.charAt(i);
            switch (c) {
                case '>':
                    sb.append('＞');//全形大於號
                    break;
                case '<':
                    sb.append('＜');//全形小於號
                    break;
                case '\'':
                    sb.append('‘');//全形單引號
                    break;
                case '\"':
                    sb.append('“');//全形雙引號
                    break;
                case '&':
                    sb.append('＆');//全形
                    break;
                case '\\':
                    sb.append('＼');//全形斜線
                    break;
                case '#':
                    sb.append('＃');//全形井號
                    break;
                default:
                    sb.append(c);
                    break;
            }
        }
        return sb.toString();
    }

    /**
    * 獲取最原始的request
    *
    * @return
    */
    public HttpServletRequest getOrgRequest() {
        return orgRequest;
    }

    /**
    * 獲取最原始的request的靜態方法
    *
    * @return
    */
    public static HttpServletRequest getOrgRequest(HttpServletRequest req) {
        if (req instanceof XssHttpServletRequestWrapper) {
            return ((XssHttpServletRequestWrapper) req).getOrgRequest();
        }

        return req;
    }

    public static void main(String[] args) {
        System.out.println(XssHttpServletRequestWrapper.xssEncode("<script>alert(1)</script>"));
    }
}
 

自定義過濾器

package cn.baozun.crm.task.filter;

import java.io.IOException;

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;

/**
 *
 * <p>攔截防止sql注入、xss注入 </p>
 * @author dexter.qin
 * @version $Id: XssFilter.java, v 0.1 2014-2-27 下午2:29:14 qinde Exp $
 */
public class XssFilter implements Filter {

    /* (non-Javadoc)
     * @see javax.servlet.Filter#doFilter(javax.servlet.ServletRequest, javax.servlet.ServletResponse, javax.servlet.FilterChain)
     */
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain filterChain)
                                                                                                   throws IOException,
                                                                                                   ServletException {

        XssHttpServletRequestWrapper xssRequest = new XssHttpServletRequestWrapper(
            (HttpServletRequest) request);
        filterChain.doFilter(xssRequest, response);

    }

    @Override
    public void destroy() {

    }

    @Override
    public void init(FilterConfig arg0) throws ServletException {

    }

}
 

轉載於：https://blog.csdn.net/mid120/article/details/53897550