自定义一个wapper 实现 HttpServletRequestWrapper
package cn.baozun.crm.task.filter; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletRequestWrapper; /** * * <p>xss过滤</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 || "".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('＞');//全角大于号 break; case '<': sb.append('＜');//全角小于号 break; case '\'': sb.append('‘');//全角单引号 break; case '\"': sb.append('“');//全角双引号 break; case '&': sb.append('＆');//全角 break; case '\\': sb.append('＼');//全角斜线 break; case '#': sb.append('＃');//全角井号 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; } public static void main(String[] args) { System.out.println(XssHttpServletRequestWrapper.xssEncode("<script>alert(1)</script>")); } }自定义过滤器
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>拦截防止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 { } }出处：http://blog.csdn.net/mid120/article/details/53897550
