替换HTML Code
JSP语言可以通过替换输出数据的特殊字符【& < > ” ’ ( )%+-】为其他表示形式后再输出给客户端，例如：

<%
String OutStr = "<script>alert('XSS')</script>";
OutStr = OutStr.replaceAll("&","&amp;");
OutStr = OutStr.replaceAll("<","&lt;");
OutStr = OutStr.replaceAll(">","&gt;");
OutStr = OutStr.replaceAll("\"","&quot;");
OutStr = OutStr.replaceAll("\'","&#39;");
OutStr = OutStr.replaceAll("\\(","&#40;");
OutStr = OutStr.replaceAll("\\)","&#41;");
OutStr = OutStr.replaceAll("%","&#37;");
OutStr = OutStr.replaceAll("\\+","&#43;");
OutStr = OutStr.replaceAll("-","&#45;");
out.println(OutStr);
%>