日期:2014-05-16 浏览次数:20402 次
源自一个题目:
请编写一个拦截器,该拦截器可以获得用户输入的用户名这个数据,业务逻辑为逐个判断用户名中是否包含“你”,“我”,“他”三个数据,如果包含则直接返回输入页面,如果不包含则运行至PersonAction。(除代码外,要给出拦截器和Action的配置文件)
最终项目结构:
直接上源码:
login.jsp:
<%@ page language="java" pageEncoding="gb2312"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <%@ taglib prefix="s" uri="/struts-tags" %> <html> <body> <s:form action="Person"> <s:textfield name="username" label="用户名"/> <s:submit value="登录" align="center"/> </s:form> </body> </html>
PersonInterceptor.java:
package com.intercept; import java.util.Map; import com.opensymphony.xwork2.ActionInvocation; import com.opensymphony.xwork2.interceptor.AbstractInterceptor; public class PersonInterceptor extends AbstractInterceptor{ public String intercept(ActionInvocation ai)throws Exception{ Map<String, Object> map=ai.getInvocationContext().getParameters(); String[] username = (String[]) map.get("username"); if(username[0].indexOf("你")==-1&&username[0].indexOf ("我")==-1&& username[0].indexOf ("他")==-1){ String result=ai.invoke(); return result; }else{ return "input"; } } }
注:这是拦截器类,注意获取jsp传值的方法以及intercept方法返回值。
struts.xml:
<?xml version="1.0" encoding="gb2312"?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"> <struts> <constant name="struts.i18n.encoding" value="gb2312"/> <package name="LanJieQi" extends="struts-default"> <interceptors> <interceptor name="intercept" class="com.intercept.PersonInterceptor"> </interceptor> </interceptors> <action name="Person" class="com.action.PersonAction"> <result name="input">/jsp/login.jsp</result> <result name="success">/jsp/success.jsp</result> <interceptor-ref name="intercept"></interceptor-ref> <interceptor-ref name="defaultStack"></interceptor-ref> </action> </package> </struts>
注:传值如果可能是汉字的话,在加上<constant>标签定义编码格式。默认拦截器"defaultStack"别忘了且要放在action配置的最下面,否则缺少了拦截核心。
PersonAction.java:
package com.action; import com.opensymphony.xwork2.ActionSupport; public class PersonAction extends ActionSupport { private String username; public void setUsername(String username) { this.username = username; } public String getUsername() { return username; } public String execute() throws Exception { return SUCCESS; } }
success.jsp:
<%@ page language="java" contentType="text/html; charset=GB2312"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <%@ taglib prefix="s" uri="/struts-tags"%> <html> <body> <s:property value="username"/> </body> </html>
结果: