struts标签的配置和使用

struts标签的配置和使用

配置：
* 在struts-config.xml文件中加入
<message-resources parameter="MessageResources" />
* 拷贝MessageResources.properties文件到src下
使用：
* 采用taglib指令引入
<%@ taglib prefix="bean" uri="http://struts.apache.org/tags-bean"%> 
<%@ taglib prefix="logic" uri="http://struts.apache.org/tags-logic"%>


MessageResources.properties

引用

# -- standard errors --
errors.header=<UL>
errors.prefix=<LI>
errors.suffix=</LI>
errors.footer=</UL>
# -- validator --
errors.invalid={0} is invalid.
errors.maxlength={0} can not be greater than {1} characters.
errors.minlength={0} can not be less than {1} characters.
errors.range={0} is not in the range {1} through {2}.
errors.required={0} is required.
errors.byte={0} must be an byte.
errors.date={0} is not a date.
errors.double={0} must be an double.
errors.float={0} must be an float.
errors.integer={0} must be an integer.
errors.long={0} must be an long.
errors.short={0} must be an short.
errors.creditcard={0} is not a valid credit card number.
errors.email={0} is an invalid e-mail address.
# -- other --
errors.cancel=Operation cancelled.
errors.detail={0}
errors.general=The process did not complete. Details should follow.
errors.token=Request could not be completed. Operation is not in sequence.
# -- welcome --
welcome.title=Struts Blank Application
welcome.heading=Welcome!
welcome.message=To get started on your own application, copy the struts-blank.war to a new WAR file using the name for your application. Place it in your container's "webapp" folder (or equivalent), and let your container auto-deploy the application. Edit the skeleton configuration files as needed, restart your container, and you are on your way! (You can find the application.properties file with this message in the /WEB-INF/src/java/resources folder.)

BeanWriteTestAction.java

package com.bjsxt.struts;

import java.util.Date;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

/**
 * 测试BeanWrite
 * @author Administrator
 *
 */
public class BeanWriteTestAction extends Action {

	@Override
	public ActionForward execute(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response)
			throws Exception {
		//普通属性
		request.setAttribute("hello", "Hello World");
		
		//html文本
		request.setAttribute("bj", "<font color='red'>北京欢迎您</font>");
		
		//日期
		request.setAttribute("today", new Date());
		
		//数字
		request.setAttribute("n", 123456.987);
		
		//结构
		Group group = new Group();
		group.setName("尚学堂");
		
		User user = new User();
		user.setUsername("张三");
		user.setAge(18);
		user.setGroup(group);
		
		request.setAttribute("user", user);
		
		return mapping.findForward("success");
	}

}

User.java

package com.bjsxt.struts;

public class User {
	
	private String username1;
	
	private int age;
	
	private Group group;

	public String getUsername() {
		return username1;
	}

	public void setUsername(String username) {
		this.username1 = username;
	}

	public int getAge() {
		return age;
	}

	public void setAge(int age) {
		this.age = age;
	}

	public Group getGroup() {
		return group;
	}

	public void setGroup(Group group) {
		this.group = group;
	}
	
	
}

Group.java

package com.bjsxt.struts;

public class Group {
	
	private String name;

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}
}

EmptyPresentTestAction.java

package com.bjsxt.struts;

import java.util.ArrayList;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

/**
 * 测试empty,notEmpty,present,notPresent
 * @author Administrator
 *
 */
public class EmptyPresentTestAction extends Action {

	@Override
	public ActionForward execute(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response)
			throws Exception {
		request.setAttribute("attr1", null);
		request.setAttribute("attr2", "");
		request.setAttribute("attr3", new ArrayList());
		return mapping.findForward("success");
	}

}

IterateTestAction.java

package com.bjsxt.struts;

import java.util.ArrayList;
import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

/**
 * 测试Iterate
 * @author Administrator
 *
 */
public class IterateTestAction extends Action {

	@Override
	public ActionForward execute(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response)
			throws Exception {
		Group group = new Group();
		group.setName("尚学堂");
		
		List userList = new ArrayList();
		for (int i=0; i<10; i++) {
			User user = new User();
			user.setUsername("user_" + i);
			user.setAge(18+i);
			user.setGroup(group);
			userList.add(user);
		}
		
		request.setAttribute("userlist", userList);
		
		return mapping.findForward("success");
	}

}

beanwrite.jsp

<%@ page language="java" contentType="text/html; charset=GB18030"
    pageEncoding="GB18030"%>
<%@ taglib prefix="bean" uri="http://struts.apache.org/tags-bean"%>    
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GB18030">
<title>测试BeanWrite</title>
</head>
<body>
	<h1>测试BeanWrite</h1>
	<hr>
	<li>普通字符串</li><br>
	hello(jsp脚本):<%=request.getAttribute("hello") %><br>
	hello(标签):<bean:write name="hello"/><br>
	<p>
	<li>html文本</li><br>
	bj(default):<bean:write name="bj"/><br>
	bj(filter="true"):<bean:write name="bj" filter="true"/><br>
	bj(filter="false"):<bean:write name="bj" filter="false"/><br>
	<p>
	<li>格式化日期</li><br>
	today(default):<bean:write name="today"/><br>
	today(format="yyyy-MM-dd HH:mm:ss"):<bean:write name="today" format="yyyy-MM-dd HH:mm:ss"/>
	<p>
	<li>格式化数字</li><br>
	n(default):<bean:write name="n"/><br>
	n(format="###,###.####"):<bean:write name="n" format="###,###.####"/><br>
	n(format="###,###.####"):<bean:write name="n" format="###,###.0000"/><br>
	<p>
	<li>结构</li><br>
	姓名：<input type="text" value="<bean:write name="user" property="username"/>"><br>
	年龄：<input type="text" value="<bean:write name="user" property="age"/>"><br>
	所属组：<input type="text" value="<bean:write name="user" property="group.name"/>"><br>
	</body>
</html>

iterate.jsp

<%@ page language="java" contentType="text/html; charset=GB18030"
    pageEncoding="GB18030"%>
<%@ taglib prefix="bean" uri="http://struts.apache.org/tags-bean"%>    
<%@ taglib prefix="logic" uri="http://struts.apache.org/tags-logic"%>   
<%@ page import="java.util.*" %>
<%@ page import="com.bjsxt.struts.*" %>    
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GB18030">
<title>测试Iterate</title>
</head>
<body>
	<h1>测试Iterate</h1>
	<hr>
	<li>jsp脚本</li><br>
	<table border="1">
		<tr>
			<td>姓名</td>
			<td>年龄</td>
			<td>所属组</td>
		</tr>
		<%
			List userList = (List)request.getAttribute("userlist");
			if (userList == null || userList.size() == 0) {
		%>
			<tr>
				<td colspan="3">没有符合条件的数据!</td>
			</tr>
		<%
			}else {
				for (Iterator iter=userList.iterator(); iter.hasNext(); ) {
					User user = (User)iter.next();
		%>
			<tr>
				<td><%=user.getUsername() %></td>
				<td><%=user.getAge() %></td>
				<td><%=user.getGroup().getName() %></td>
			</tr>
		<%
				}
			}
		%>
	</table>
	
	<p>
	<li>标签</li><br>
	<table border="1">
		<tr>
			<td>姓名</td>
			<td>年龄</td>
			<td>所属组</td>
		</tr>
		<logic:empty name="userlist">
			<tr>
				<td colspan="3">没有符合条件的数据!</td>
			</tr>
		</logic:empty>
		<logic:notEmpty name="userlist">
			<logic:iterate id="u" name="userlist">
				<tr>
					<td>
						<bean:write name="u" property="username"/>
					</td>
					<td>
						<bean:write name="u" property="age"/>
					</td>
					<td>
						<bean:write name="u" property="group.name"/>
					</td>
				</tr>
			</logic:iterate>
		</logic:notEmpty>
	</table>	
</body>
</html>

emptypresent.jsp

<%@ page language="java" contentType="text/html; charset=GB18030"
    pageEncoding="GB18030"%>
<%@ taglib prefix="logic" uri="http://struts.apache.org/tags-logic"%>    
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GB18030">
<title>测试empty,notEmpty,present,notPresent</title>
</head>
<body>
	<h1>测试empty,notEmpty,present,notPresent</h1>
	<hr>
	<logic:empty name="attr1">
		attr1为空<br>
	</logic:empty>
	<logic:notEmpty name="attr1">
		attr1不为空<br>
	</logic:notEmpty>
	<logic:present name="attr1">
		attr1存在<br>
	</logic:present>
	<logic:notPresent name="attr1">
		attr1不存在<br>
	</logic:notPresent>
	
	<p>
	<logic:empty name="attr2">
		attr2为空<br>
	</logic:empty>
	<logic:notEmpty name="attr2">
		attr2不为空<br>
	</logic:notEmpty>
	<logic:present name="attr2">
		attr2存在<br>
	</logic:present>
	<logic:notPresent name="attr2">
		attr2不存在<br>
	</logic:notPresent>
	
	<p>
	<logic:empty name="attr3">
		attr3为空<br>
	</logic:empty>
	<logic:notEmpty name="attr3">
		attr3不为空<br>
	</logic:notEmpty>
	<logic:present name="attr3">
		attr3存在<br>
	</logic:present>
	<logic:notPresent name="attr3">
		attr3不存在<br>
	</logic:notPresent>
</body>
</html>