• 方案一

<span style="font-family:Comic Sans MS;">web.xml

<context-param>
   <param-name>defaultHtmlEscape</param-name>
   <param-value>true</param-value>
</context-param>

Forms

<spring:htmlEscape defaultHtmlEscape="true" /></span><span style="font-family:微软雅黑;">
</span>

<span style="font-family:Comic Sans MS;">package com.sic.web.beans;

import java.util.Enumeration;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;

public class XssHttpServletRequestWrapper extends HttpServletRequestWrapper {  
    public XssHttpServletRequestWrapper(HttpServletRequest servletRequest) {
        super(servletRequest);
    }
    public String[] getParameterValues(String parameter) {
      String[] values = super.getParameterValues(parameter);
      if (values==null)  {
                  return null;
          }
      int count = values.length;
      String[] encodedValues = new String[count];
      for (int i = 0; i < count; i++) {
                 encodedValues[i] = cleanXSS(values[i]);
       }
      return encodedValues;
    }
    public String getParameter(String parameter) {
          String value = super.getParameter(parameter);
          if (value == null) {
                 return null;
                  }
          return cleanXSS(value);
    }
    public String getHeader(String name) {
        String value = super.getHeader(name);
        if (value == null)
            return null;
        return cleanXSS(value);
    }
    private String cleanXSS(String value) {
        value = value.replaceAll("<", "& lt;").replaceAll(">", "& gt;");
        value = value.replaceAll("\\(", "& #40;").replaceAll("\\)", "& #41;");
        value = value.replaceAll("'", "& #39;");
        value = value.replaceAll("eval\\((.*)\\)", "");
        value = value.replaceAll("[\\\"\\\'][\\s]*javascript:(.*)[\\\"\\\']", "\"\"");
        value = value.replaceAll("script", "");
        return value;
    }

} </span>

<span style="font-family:Comic Sans MS;">package com.sic.web.beans;

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;  
import javax.servlet.http.HttpServletResponse;

public class XssFilter implements Filter {
    FilterConfig filterConfig = null;

    public void init(FilterConfig filterConfig) throws ServletException {
        this.filterConfig = filterConfig;
    }

    public void destroy() {
        this.filterConfig = null;
    }

    public void doFilter(ServletRequest request, ServletResponse response,
            FilterChain chain) throws IOException, ServletException {
        chain.doFilter(new XssHttpServletRequestWrapper(
                (HttpServletRequest) request), response);
    }
}</span>

<span style="font-family:Comic Sans MS;"><filter>
     <filter-name>XssSqlFilter</filter-name>
     <filter-class>com.ibm.web.beans.XssFilter</filter-class>
</filter>
<filter-mapping>
     <filter-name>XssSqlFilter</filter-name>
     <url-pattern>/*</url-pattern>
     <dispatcher>REQUEST</dispatcher>
</filter-mapping></span>

一个实例

<span style="font-family:Comic Sans MS;">输入用户名 : >"'><script>alert(1779)</script>
输入用户名: usera>"'><img src="javascript:alert(23664)">
输入用户名: "'><IMG SRC="/WF_XSRF.html--end_hig--begin_highlight_tag--hlight_tag--">
输入用户名: usera'"><iframe src=http://demo.testfire.net--en--begin_highlight_tag--d_highlight_tag-->

密码随意输入。</span>

结束语