JSP使用过滤器防止Xss漏洞（filter拦截jsp）干货分享

public class XssHttpServletRequestWrapper extends HttpServletRequestWrapper {
HttpServletRequest orgRequest=null;

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

@Override
public String getParameter(String name) {
String value=super.getParameter(xssEncode(name));
if (value !=null) {
value=xssEncode(value);
}
return value;
}

@Override
public String getHeader(String name) {

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

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(‘＞’);//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();
}

public HttpServletRequest getOrgRequest() {
return orgRequest;
}

public static HttpServletRequest getOrgRequest(HttpServletRequest req) {
if(req instanceof XssHttpServletRequestWrapper){
return ((XssHttpServletRequestWrapper)req).getOrgRequest();
}

return req;
}
}