JSP Struts如何过滤xss攻击

<package name="default" namespace="/"    extends="struts-default, json-default">    <!-- 配置拦截器 -->    <interceptors>      <!-- 定义xss拦截器 -->      <interceptor name="xssInterceptor" class="...此处填写拦截器类名"></interceptor>      <!-- 定义一个包含xss拦截的拦截栈 -->      <interceptor-stack name="myDefault">        <interceptor-ref name="xssInterceptor"></interceptor-ref>        <interceptor-ref name="defaultStack"></interceptor-ref>      </interceptor-stack>    </interceptors>    <!-- 这个必须配置，否则拦截器不生效 -->    <default-interceptor-ref name="myDefault"></default-interceptor-ref>    <action>    ...此处省略n个action    </action>  </package>

import java.util.Map;import org.apache.commons.lang3.StringEscapeUtils;import com.opensymphony.xwork2.ActionContext;import com.opensymphony.xwork2.ActionInvocation;import com.opensymphony.xwork2.interceptor.AbstractInterceptor;public class XssInterceptor extends AbstractInterceptor{  @Override  public String intercept(ActionInvocation invocation) throws Exception {    // TODO Auto-generated method stub    ActionContext actionContext = invocation.getInvocationContext();    Map<String, Object> map = actionContext.getParameters();    for (Map.Entry<String, Object> entry : map.entrySet()) {      String value = ((String[])(entry.getValue()))[0];      entry.setValue(StringEscapeUtils.escapeHtml4(value));//将提交上来的字符串进行转码      //System.out.println((entry.getValue()));    }    return invocation.invoke();  }}