Struts标签（2）Bean标签

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Struts标签（2）Bean标签

<bean:write>标签（重点掌握）

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1. <bean:define>标签

<%@ page language="java" pageEncoding="gbk"%>

<%@ taglib uri="http://struts.apache.org/tags-bean" prefix="bean" %>

<%@ taglib uri="http://struts.apache.org/tags-html" prefix="html" %>

<%@ taglib uri="http://struts.apache.org/tags-logic" prefix="logic" %>

<%@ taglib uri="http://struts.apache.org/tags-tiles" prefix="tiles" %>

<html:html lang="true">

<head>

<title>BeanDemo01.jsp</title>

</head>

<body>

<bean:define id="str" value="Hello JPO!!!"></bean:define>

</body>

</html:html>

Hello JPO!!!

2. <bean:size>标签

<%@ page language="java" pageEncoding="gbk"%>

<%@ page import="java.util.*" %>

<%@ taglib uri="http://struts.apache.org/tags-bean" prefix="bean" %>

<%@ taglib uri="http://struts.apache.org/tags-html" prefix="html" %>

<%@ taglib uri="http://struts.apache.org/tags-logic" prefix="logic" %>

<%@ taglib uri="http://struts.apache.org/tags-tiles" prefix="tiles" %>

<html:html lang="true">

<head>

<title>BeanDemo02.jsp</title>

</head>

<body>

Map m = new HashMap();

m.put("one","1");

m.put("two","2");

m.put("three","3");

m.put("zero","0");

request.setAttribute("map",m);

Collection c = new ArrayList();

c.add("ws");

c.add("jpo");

c.add("jp3");

request.setAttribute("namecol",c);

<bean:size id="size" name="map" scope="request"/>

<h1>Map长度是：${size}</h1>

<bean:size id="si" name="namecol" scope="request"/>

<h1>Collection长度是：${si}</h1>

</body>

</html:html>

Map长度是：4

Collection长度是：3

3. <bean:write>标签（重点掌握）

<%@ page language="java" pageEncoding="gbk"%>

<%@ page import="org.ws.tag.*" %>

<%@ taglib uri="http://struts.apache.org/tags-bean" prefix="bean" %>

<%@ taglib uri="http://struts.apache.org/tags-html" prefix="html" %>

<%@ taglib uri="http://struts.apache.org/tags-logic" prefix="logic" %>

<%@ taglib uri="http://struts.apache.org/tags-tiles" prefix="tiles" %>

<html:html lang="true">

<head>

<title>BeanDemo04.jsp</title>

</head>

<body>

<jsp:useBean id="simple" class="org.ws.tag.SimpleBean" scope="request"></jsp:useBean>

<jsp:setProperty name="simple" property="name" value="ws"/>

<jsp:setProperty name="simple" property="password" value="jpo"/>

<h1>使用JSP标签</h1>

名称：<jsp:getProperty name="simple" property="name"/>

密码：<jsp:getProperty name="simple" property="password"/>

<h1>使用bean标签</h1>

名称：<bean:write name="simple" property="name" scope="request"/>

密码：<bean:write name="simple" property="password" scope="request"/>

名称：${simple.name}

密码：${simple.password}

</body>

</html:html>

上面的推荐写法（使用标签），效果等同于下面的这段Java代码：

SimpleBean si = new SimpleBean();

si.setName("yyg");

si.setPassword("juke");

request.setAttribute("simple",si);

SimpleBean.java

package org.ws.tag;

public class SimpleBean {

private String name;

private String password;

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public String getPassword() {

return password;

}

public void setPassword(String password) {

this.password = password;

}

使用JSP标签

名称：ws 密码：jpo

使用bean标签

名称：ws 密码：jpo

使用EL

名称：ws 密码：jpo

4. <bean:message>标签

<%@ page language="java" pageEncoding="gbk"%>

<%@ taglib uri="http://struts.apache.org/tags-bean" prefix="bean" %>

<%@ taglib uri="http://struts.apache.org/tags-html" prefix="html" %>

<%@ taglib uri="http://struts.apache.org/tags-logic" prefix="logic" %>

<%@ taglib uri="http://struts.apache.org/tags-tiles" prefix="tiles" %>

<html:html lang="true">

<head>

<title>BeanDemo05.jsp</title>

</head>

<body>

<bean:message key="welcome" arg0="WS"/>

</body>

</html:html>

ApplicationResources.properties

# Resources for parameter 'com.ws.struts.ApplicationResources'

# Project StrutsTag

welcome={0}, You are welcome!!!

WS, You are welcome!!!