Struts2学习日志---3 Path Action 通配符
?struts2中的路径问题是根据action的路径而不是jsp路径来确定,所以尽量不要使用相对路径。
虽然可以用redirect方式解决,但redirect方式并非必要。
解决办法非常简单,统一使用绝对路径。(在jsp中用request.getContextRoot方式来拿到webapp的路径)
或者使用myeclipse经常用的,指定basePath
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<%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><base href="<%=basePath%>"><a href="<%=basePath%>index.jsp">index.jsp</a>?
动态方法调用:
Action执行的时候并不一定要执行execute方法
可以在配置文件中配置Action的时候用method=来指定执行哪个方法也可以在url地址中动态指定(动态方法调用DMI)(推荐)
前者会产生太多的action,所以不推荐使用
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UserAction.java中
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package com.zhangmin.struts.action;import com.opensymphony.xwork2.ActionSupport;public class UserAction extends ActionSupport {public String add() {return SUCCESS;}}?struts.xml中
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<?xml version="1.0" encoding="UTF-8" ?><!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.devMode" value="true" /> <package name="user" extends="struts-default" namespace="/user"> <action name="user" name="code"><a href="<%=path %>/user/user!add">添加用户</a>?
通配符
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使用通配符,将配置量降到最低
不过,一定要遵守"约定优于配置"的原则
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1.src 目录下包括CourseAction.java ?TeacherAction.java ?StudentAction.java
???package com.zm.struts.action;
import com.opensymphony.xwork2.ActionSupport;public class CourseAction extends ActionSupport{public String add(){return SUCCESS;}public String delete(){return SUCCESS;}}?package com.zm.struts.action;
import com.opensymphony.xwork2.ActionSupport;public class StudentAction extends ActionSupport{public String add(){return SUCCESS;}public String delete(){return SUCCESS;}}?package com.zm.struts.action;import com.opensymphony.xwork2.ActionSupport;public class TeacherAction extends ActionSupport{public String add(){return SUCCESS;}public String delete(){return SUCCESS;}} ?struts.xml文件中:
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<?xml version="1.0" encoding="UTF-8" ?><!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.devMode" value="true"/><package name="actions" namespace="/actions" extends="struts-default"><action name="Student*" method="{1}"><result>/Student{1}_success.jsp</result></action><action name="*_*" method="{2}"><result>/{1}_{2}_success.jsp</result></action></package></struts>?3.webRoot下面的jsp文件,用于显示:
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Course_add_success.jsp
Course_delete_success.jsp
Student_add_success.jsp
Student_delete_success.jsp
Teacher_add_success.jsp
Teacher_delete_success.jsp
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