JSP Struts过滤xss攻击的解决办法

<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();
  }
}