strruts標籤使用簡介

web.xml配置如下：

Xml代碼

< filter >
< filter-name > struts2 </ filter-name >
< filter-class >
org.apache.struts2.dispatcher.FilterDispatcher
</ filter-class >
</ filter >
< filter-mapping >
< filter-name > struts2 </ filter-name >
< url-pattern > /* </ url-pattern >
</ filter-mapping >

<filter>
		<filter-name>struts2</filter-name>
		<filter-class>
			org.apache.struts2.dispatcher.FilterDispatcher
		</filter-class>
	</filter>
	<filter-mapping>
		<filter-name>struts2</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>

struts.xml配置如下：

Xml代碼

< package name = "tags" extends = "struts-default" >
< action name = "tags" class = "com.mengya.action.TagsAction" >
< result name = "success" > /tags.jsp </ result >
</ action >
</ package >

<package name="tags" extends="struts-default">
		<action name="tags" class="com.mengya.action.TagsAction">
			<result name="success">/tags.jsp</result>
		</action>
	</package>

TagsAction如下：

Java代碼

public class TagsAction extends ActionSupport {
private String username;
private String password;
@Override
public String execute() throws Exception {
this .addFieldError( "actionError" , "error!!" );
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;
}
}

public class TagsAction extends ActionSupport {
	private String username;

	private String password;
	
	@Override
	public String execute() throws Exception {
		this.addFieldError("actionError", "error!!");
		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;
	}

}

Dog Bean如下：

Java代碼

public class Dog {
private String dogName;
public String getDogName() {
return dogName;
}
public void setDogName(String dogName) {
this .dogName = dogName;
}
@Override
public String toString() {
return "Dog：DogName=" + dogName;
}
}

public class Dog {
	private String dogName;

	public String getDogName() {
		return dogName;
	}

	public void setDogName(String dogName) {
		this.dogName = dogName;
	}

	@Override
	public String toString() {
		return "Dog：DogName=" + dogName;
	}

}

頁面struts標籤使用如下：

Html代碼

< a href = "tags.action?username=u&password=p&age=9" > Struts2Tags </ a >
< body >
< ol >
< li >
property：
< s:property value = "username" />
</ li >
< li >
property 取值爲字符串：
< s:property value = "'username'" />
</ li >
< li >
property 設定爲默認值：
< s:property value = "admin" default = "管理員" />
</ li >
< li >
property 設定爲HTML：
< s:property value = "'<hr/>'" escape = "false" />
</ li >
< hr />
< li >
set 設定mengya的值（默認爲Request和ActionContext）：
< s:set var = "mengya" value = "username" > </ s:set >
</ li >
< li >
set 從request中取值：
< s:property value = "#request.mengya" />
</ li >
< li >
set 從ActionContext中取值：
< s:property value = "#mengya" />
</ li >
< li >
set 設定範圍：
< s:set var = "adminPassword" value = "password" scope = "session" />
</ li >
< li >
set 從相應的範圍取值：
< %=session.getAttribute("adminPassword")% >
</ li >
< li >
set 從相應的範圍取值：
< s:property value = "#session.adminPassword" />
</ li >
< hr >
< li >
bean 定義bean，並使用bean的param來設定的新屬性值
< s:bean name = "com.mengya.bean.Dog" > </ s:bean >
< %-- 沒有指定var則在 </ s:bean > 之前會構造一個對象放在椎頂在 </ s:bean > 結束之前則放到了actionContext中 --% >
</ li >
< li >
bean 定義bean，並使用bean的param來設定的新屬性值
< s:bean name = "com.mengya.bean.Dog" var = "myDog" >
< s:param name = "dogName" value = "'myDog'" > </ s:param >
</ s:bean >
取出值：
< s:property value = "#myDog" />
</ li >
< hr >
< li >
include 包含靜態英文html
< s:include value = "/include1.html" > </ s:include >
</ li >
< li >
include 包含靜態中文html
< s:include value = "/include2.html" > </ s:include >
</ li >
< li >
%的用法：%是將%{}中的內空強轉成ognl表達示而不是普通字符串
< s:set var = "incPage" value = "'/include1.html'" > </ s:set >
< s:include value = "incPage" > </ s:include >
< s:include value = "%{incPage}" > </ s:include >
< %-- 將incPage作爲ognl表達式 --% >
</ li >
< li >
fielderror：
< s:fielderror key = "actionError" theme = "simple" > </ s:fielderror >
</ li >
< hr >
< li >
if elseif else: age =
< s:property value = "#parameters.age[0]" />
< s:if test = "#parameters.age[0]<0" >
age error!
</ s:if >
< s:elseif test = "#parameters.age[0]<20" >
to young!
</ s:elseif >
< s:else >
OK!
</ s:else >
  |  
< s:set var = "age" value = "#parameters.age[0]" > </ s:set >
< s:if test = "age<0" >
age error!
</ s:if >
< s:elseif test = "age<20" >
to young!
</ s:elseif >
< s:else >
ok!
</ s:else >
  |  
< s:if test = "#parameters.aaa==null" > null </ s:if >
</ li >
< li >
遍歷集合：
< s:iterator value = "{'aa','bb','cc'}" >
< s:property />  |
</ s:iterator >
</ li >
< li >
自定義變量：
< s:iterator value = "{'aa','bb','cc'}" var = "temp" >
< s:property value = "#temp" />  |  < s:property
value = "#temp.toUpperCase()" />
</ s:iterator >
</ li >
< li >
使用status:
< s:iterator value = "{11,22,33}" status = "status" >
< s:property />  |遍歷過的總元素： < s:property value = "#status.count" />  |當前元素索引： < s:property
value = "#status.index" />  |當前值是否爲偶數： < s:property
value = "#status.even" />  |當前值是否爲奇數： < s:property
value = "#status.odd" />  |當前值是否爲第一個： < s:property
value = "#status.first" />  |當前值是否爲最後一個： < s:property
value = "#status.last" />
</ s:iterator >
</ li >
< s:debug > </ s:debug >
</ ol >
總結：
$用於i18n和struts配置文件
#用於得到ActionContext的值
%將原本的文本屬性解析爲OGNL表達式，對於本來就是OGNL的屬性不起做用
</ body >

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strruts標籤使用簡介

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