xssProject在java web项目中应用

1.项目引入xssProtect-0.1.jar、antlr-3.0.1.jar、antlr-runtime-3.0.1.jar包
2.封装request
 

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。<br/>
     * 如果需要获得原始的值，则通过super.getParameterValues(name)来获取<br/>
     * 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。<br/>
     * 如果需要获得原始的值，则通过super.getHeaders(name)来获取<br/> 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;
        }
        
        StringReader reader = new StringReader( s );
        StringWriter writer = new StringWriter();
        try {
            HTMLParser.process( reader, writer, new XSSFilter(), true );
            
            return writer.toString();
        } 
        catch (NullPointerException e) {
            return s;
        }
        catch(Exception ex)
        {
            ex.printStackTrace();
        }
        
        return null;
        
    }

    /**
     * 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;
    }
  

3.创建过滤器
 

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

4.在web.xml中配置过滤器

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