Structs复习 Structs标签

时间：2023-03-09 16:10:17
Structs复习 Structs标签

如果类型是object Structs会把它默认解析为OGNL表达式

想取字符串的话就 ‘’ ‘ ’ ‘’

jar包

Structs复习 Structs标签

web.xml、

<?xml version="1.0" encoding="UTF-8"?>

<web-app version="2.5"

    xmlns="http://java.sun.com/xml/ns/javaee"

    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee

    http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

  <welcome-file-list>

    <welcome-file>index.jsp</welcome-file>

  </welcome-file-list>

  <filter>

        <filter-name>struts2</filter-name>

        <!--<filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>-->

        <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>

    </filter>

    <filter-mapping>

        <filter-name>struts2</filter-name>

        <url-pattern>/*</url-pattern>

    </filter-mapping>

</web-app>

Structs.xml

<?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.enable.DynamicMethodInvocation" value="false" />-->

    <constant name="struts.devMode" value="true" />

    <!--<constant name="struts.ognl.allowStaticMethodAccess" value="true"></constant>-->

    <constant name="struts.ui.theme" value="simple" />

    <package name="tags" extends="struts-default">

        <action name="tags" class="com.bjsxt.struts2.tags.TagsAction">

            <result>/tags.jsp</result>

        </action>

    </package>

</struts>

Dog.java

package com.bjsxt.struts2.tags;

public class Dog {

    private String name;

    public Dog() {

    }

    public Dog(String name) {

        super();

        this.name = name;

    }

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    @Override

    public String toString() {

        return "dog: " + name;

    }

}

S.hava

package com.bjsxt.struts2.tags;

public class S {

    public static String STR = "STATIC STRING";

    public static String s() {

        return "static method";

    }

}

TagsAction.java

package com.bjsxt.struts2.tags;

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 String getUsername() {

        return username;

    }

    public void setPassword(String password) {

        this.password = password;

    }

    public void setUsername(String username) {

        this.username = username;

    }

}

User.java

package com.bjsxt.struts2.tags;

public class User {

    private int age = ;

    public User() {

    }

    public User(int age) {

        super();

        this.age = age;

    }

    public int getAge() {

        return age;

    }

    public void setAge(int age) {

        this.age = age;

    }

    @Override

    public String toString() {

        return "user" + age;

    }

}

index.jsp

<?xml version="1.0" encoding="GB18030" ?>

<%@ page language="java" contentType="text/html; charset=GB18030"

    pageEncoding="GB18030"%>

<%

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<meta http-equiv="Content-Type" content="text/html; charset=GB18030" />

<title>Insert title here</title>

</head>

<body>

    访问属性

    <a href="http://localhost:6666//Struts2_2000_StrutsTags/tags.action?username=u&password=p">tags</a>

</body>

</html>

具体用法建议使用的时候再回来参考

<?xml version="1.0" encoding="GB18030" ?>

<%@ page language="java" contentType="text/html; charset=GB18030"

    pageEncoding="GB18030"%>

<%@ taglib uri="/struts-tags" prefix="s" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<meta http-equiv="Content-Type" content="text/html; charset=GB18030" />

<title>Struts-Tags学习</title>

</head>

<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HTML: <s:property value="'<hr/>'" escape="false"/> </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>set 从相应范围取值: <%=pageContext.getAttribute("adminPassword") %></li>

        --%>

        <li>set 设定var，范围为ActionContext: <s:set var="adminPassword" value="password" scope="session"/></li>

        <li>set 使用#取值: <s:property value="#adminPassword"/> </li>

        <li>set 从相应范围取值: <s:property value="#session.adminPassword"/> </li>

        <hr />

        <%--<li>push:<s:set name="myDog" value="new com.bjsxt.struts2.ognl.Dog('oudy')"></s:set></li>

        <li>

        push:<s:push value="#myDog">

            <s:property value="name"/>

        </s:push>

        </li>

        <li>push: <s:property value="name"/></li>

        --%>

        <hr />

        <li>bean 定义bean,并使用param来设定新的属性值:

            <s:bean name="com.bjsxt.struts2.tags.Dog" >

                <s:param name="name" value="'pp'"></s:param>

                <s:property value="name"/>

            </s:bean>

        </li>

        <li>bean 查看debug情况:

            <s:bean name="com.bjsxt.struts2.tags.Dog" var="myDog">

                <s:param name="name" value="'oudy'"></s:param>

            </s:bean>

            拿出值：

            <s:property value="#myDog.name"/>

        </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>if elseif else:

        age = <s:property value="#parameters.age[0]" /> <br />

        <s:set var="age" value="#parameters.age[0]" />

        <s:if test="#age < 0">wrong age!</s:if>

        <s:elseif test="#parameters.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/> |

            遍历过的元素总数：<s:property value="#status.count"/> |

            遍历过的元素索引：<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>

        <li>

        <s:fielderror fieldName="fielderror.test" theme="simple"></s:fielderror>

        </li>

    </ol>

</body>

</html>

include.jsp

<?xml version="1.0" encoding="GB18030" ?>

<%@ page language="java" contentType="text/html; charset=GB18030"

    pageEncoding="GB18030"%>

<%@ taglib uri="/struts-tags" prefix="s" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<meta http-equiv="Content-Type" content="text/html; charset=GB18030" />

<title>_include</title>

</head>

<body>

params :<br />

使用property取参数：p1=<s:property value="#parameters.p1"/> <br />

使用property取参数：p2=<s:property value="#parameters.p2"/> <br />

使用property取参数：p3=<s:property value="#parameters.p3"/> <br />

</body>

</html>

_include1.html

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