Struts2 struts标签
1.index.jsp
<body> 访问属性 <a href="tags.action?username=u&password=p">tags</a> </body>
2.struts.xml
<struts> <constant name="struts.enable.DynamicMethodInvocation" value="true" /> <constant name="struts.devMode" value="true" /> <constant name="struts.ui.theme" value="simple"/> <package name="tags" extends="struts-default"> <action name="tags" class="com.wxh.action.TagsAction"> <result>/tags.jsp</result> </action> </package> </struts>
3.tags.jsp
<body>
<ol>
<li>property:<s:property value="username"/></li>
<li>property 取值为字符串:<s:property value="'username'"/></li>
<li>property 设定默认值:<s:property value="admin" default="管理员"/></li>
<li>property 设定为HTML:<s:property value="'<hr/>'" escape="true"/></li>
<hr/>
<li>set 设定adminName值（默认为request和ActionContext）：<s:set var="adminName" value="username"/></li>
<li>set 从request取值：<s:property value="#request.adminName"/></li>
<li>set 从ActionContext取值：<s:property value="#adminName"/></li>
<li>set 设定范围：<s:set name="adminPassword" value="password" scope="page"/></li>
<li>从相应的范围取值：<%=pageContext.getAttribute("adminPassword")%></li>
<li>set 设定var,范围为ActionContext:<s:set name="adminPassword" value="password" var="a"/></li>
<li>使用#取值:<s:property value="#a"/></li>
<hr/>
<li>bean 定义bean，并使用param来设定新的属性值；
<s:bean name="com.wxh.action.Dog">
<s:param name="name" value="'smalldog'"></s:param>
</s:bean>
<li>bean查看debug情况：
<s:bean name="com.wxh.action.Dog" var="myDog"></s:bean>
</li>
<hr/>
<li>include include1.html 包含静态英文文件
<s:include value="/include1.html"></s:include>
</li>
<li>include include2.html 包含静态中文文件
<s:include value="/include2.html"></s:include>
</li>
<li>include include1.html 包含静态英文文件，说明%用法
<s:set var="incPage" value="'/include1.html'"/>
<s:include value="%{#incPage}"></s:include>
</li>
<hr/>
<li>
<s:fielderror fieldName="fielderror.test" theme="simple"></s:fielderror>
</li>
<hr/>
<li>if elseif else:
age=<s:property value="#parameters.age[0]"/><br/>
<s:if test="#parameter.age[0]<0">wrong age!</s:if>
<s:elseif test="#parameter.age[0]<20">too young!</s:elseif>
<s:else>yeah!</s:else><br/>
<s:if test="#parameters.aaa==null">null</s:if>
</li>
<hr/>
<li>遍历集合：<br/>
<s:iterator value="{1,2,3}">
<s:property/>
</s:iterator>
</li>
<li>自定义变量：<br/>
<s:iterator value="{'aaa','bbb','ccc'}" var="x">
<s:property value="#x.toUpperCase()"/>
</s:iterator>
</li>
<li>使用status:<br/>
<s:iterator value="{'aaa','bbb','ccc'}" status="status">
<s:property/>|
遍历过得元素总数：<s:property value="#status.count"/>|
遍历过得元素索引：<s:property value="#status.index"/>|
当前是偶数?：<s:property value="#status.even"/>|
当前是奇数?：<s:property value="#status.odd"/>|
是第一个元素吗？：<s:property value="#status.first"/>|
是最后一个元素吗？：<s:property value="#status.last"/>
<br/>
</s:iterator>
</li>
<li>
<s:iterator value="#{1:'a',2:'b',3:'c'}" >
<s:property value="key"/>|<s:property value="value"/><br/>
</s:iterator>
</li>
<li>
<s:iterator value="#{1:'a',2:'b',3:'c'}" var="x">
<s:property value="#x.key"/>|<s:property value="#x.value"/><br/>
</s:iterator>
</li>
<s:debug></s:debug>
</ol>
</body>
4.TagsAction.java
package com.wxh.action;
import com.opensymphony.xwork2.ActionSupport;
public class TagsAction extends ActionSupport{
private String password;
private String username;
public TagsAction(){
}
public String execute(){
this.addFieldError("fielderror.test","wrong!");
return SUCCESS;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
}
package com.wxh.action;
public class Dog {
public Dog(){
}
public Dog(String anme){
super();
this.name=name;
}
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String toString(){
return "dog:"+name;
}
}
package com.wxh.action;
public class S {
public static String STR="STATIC STRING";
public static String s(){
return "static method";
}
}
7.User.java
package com.wxh.action;
public class User {
private int age;
public User(){
System.out.println("user.constructor!");
}
public User(int age){
super();
this.age=age;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String toString(){
return "user"+age;
}
}
8.include1.html
<body> include1.html </body>
9.include2.html
<body> 中文 </body>