XSS漏洞修复----过滤器(亲测可用)

1.创建XssHttpServletRequestWrapper

  public class XssHttpServletRequestWrapper extends HttpServletRequestWrapper {  
    HttpServletRequest orgRequest = null;  

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

    /**
     * 覆盖getParameter方法，将参数名和参数值都做xss过滤。

     * 如果需要获得原始的值，则通过super.getParameterValues(name)来获取

     * getParameterNames,getParameterValues和getParameterMap也可能需要覆盖
     */  
    @Override  
    public String getParameter(String name) {  
        String value = super.getParameter(xssEncode(name));  
        if (value != null) {  
            value = xssEncode(value);  
        }  
        return value;  
    }  

    /**
     * 覆盖getHeader方法，将参数名和参数值都做xss过滤。

     * 如果需要获得原始的值，则通过super.getHeaders(name)来获取

     * getHeaderNames 也可能需要覆盖
     */  
    @Override  
    public String getHeader(String name) {  

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

    /**
     * 将容易引起xss漏洞的半角字符直接替换成全角字符
     *  
     * @param s
     * @return
     */  
    private static String xssEncode(String s) {  
        if (s == null || s.isEmpty()) {  
            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("＞");// 转义大于号  
                break;  
            case '<':  
                sb.append("＜");// 转义小于号  
                break;  
            case '\'':  
                sb.append("＇");// 转义单引号  
                break;  
            case '\"':  
                sb.append("＂");// 转义双引号
                break;  
            case '&':  
                sb.append("＆");// 转义&  
                break;  
            case '@':  
                sb.append("＠");// 转义@
                break;
            case '%':  
                sb.append("％");// 转义%
                break;
            case '(':  
                sb.append("（");// 转义(
                break;
            case ')':  
                sb.append("）");// 转义)
                break;
            case ',':  
                sb.append("，");// 转义,
                break;
            case '.':  
                sb.append("。");// 转义.
                break;
            case ';':  
                sb.append("；");// 转义;
                break;
            case '|':  
                sb.append("｜");// 转义|
                break;
            default:  
                sb.append(c);  
                break;   
            }  
        }  
        return sb.toString();  
    }  

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

    /**
     * 获取最原始的request的静态方法
     *  
     * @return
     */  
    public static HttpServletRequest getOrgRequest(HttpServletRequest req) {  
        if (req instanceof XssHttpServletRequestWrapper) {  
            return ((XssHttpServletRequestWrapper) req).getOrgRequest();  
        }  

        return req;  
    }  
} 

2.创建Filter

public class XssFilter implements Filter {  

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

    @Override  
    public void doFilter(ServletRequest request, ServletResponse response,  
            FilterChain chain) throws IOException, ServletException {  

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

    @Override  
    public void destroy() {  
    }  

}  

3.最后在web.xml中加入:

    <filter>  
         <filter-name>XssFilterfilter-name>  
         <filter class>com.thinkgem.jeesite.common.filter.XssFilterfilter-class>  
     filter>  
     <filter-mapping>  
         <filter-name>XssFilterfilter-name>  
         <url-pattern>/*url-pattern>  
     filter-mapping>

本文章是根据两位大神的博客改编而来.