<package name="default" namespace="/"
    extends="struts-default, json-default">
    <!-- 配置攔截器 -->
    <interceptors>
      <!-- 定義xss攔截器 -->
      <interceptor name="xssInterceptor" class="...此處填寫攔截器類名"></interceptor>
      <!-- 定義一個包含xss攔截的攔截棧 -->
      <interceptor-stack name="myDefault">
        <interceptor-ref name="xssInterceptor"></interceptor-ref>
        <interceptor-ref name="defaultStack"></interceptor-ref>
      </interceptor-stack>
    </interceptors>
    <!-- 這個必須配置，否則攔截器不生效 -->
    <default-interceptor-ref name="myDefault"></default-interceptor-ref>
    <action>
    ...此處省略n個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));//將提交上來的字符串進行轉碼
      //System.out.println((entry.getValue()));
    }
    return invocation.invoke();
  }
}