struts1四:常用标签
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struts1支持的5种标签:
html 标签： 用来创建能够和Struts 框架和其他相应的HTML 标签交互的HTML 输入表单
Bean 标签： 在访问JavaBeans 及其属性，以及定义一个新的bean 时使用
<%@ taglib uri="http://struts.apache.org/tags-bean" prefix="bean"%>
Logic 标签： 管理条件产生的输出和对象集产生的循环
<%@ taglib uri="http://struts.apache.org/tags-logic" prefix="logic" %>
Template 标签： 随着Tiles框架包的出现，此标记已开始减少使用
Nested 标签： 增强对其他的Struts 标签的嵌套使用的能力
在Action中设置属性并在jsp中取出属性
LoginAction
package com.bjpowernode.struts; import java.util.ArrayList; import java.util.Date; import java.util.HashMap; import java.util.List; import java.util.Map; 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; public class LoginAction extends Action{ @Override public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception { LoginActionForm laf = (LoginActionForm)form; if("admin".equals(laf.getUsername()) && "admin".equals(laf.getPassword())){ request.setAttribute("message", "test message!"); request.setAttribute("user", createUser("张三", "123456", 29)); request.setAttribute("userList", createUserList()); request.setAttribute("userMap", createUserMap()); return mapping.findForward("success"); } return mapping.findForward("error"); } private User createUser(String username, String password, int age){ User user = new User(); user.setUsername(username); user.setPassword(password); user.setAge(age); user.setCreateDate(new Date()); return user; } private List<User> createUserList(){ List<User> userList = new ArrayList<User>(); userList.add(createUser("李四", "123123", 30)); userList.add(createUser("王五", "123999", 34)); userList.add(createUser("赵六", "123123", 39)); return userList; } private Map<String, User> createUserMap(){ Map<String, User> map = new HashMap<String, User>(); map.put("k1", createUser("map1", "map123", 100)); map.put("k2", createUser("map2", "map12123", 110)); map.put("k3", createUser("map3", "map123map", 130)); return map; } }
跳转后的JSP
login_success.jsp
<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%> <%@ taglib uri="http://struts.apache.org/tags-bean" prefix="bean" %> <%@ taglib uri="http://struts.apache.org/tags-logic" prefix="logic" %> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>My JSP ‘login_success.jsp‘ starting page</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <!-- <link rel="stylesheet" type="text/css" href="styles.css"> --> </head> <body> This is my JSP page. Success!!! <br> <!-- 普通属性取出 --> <bean:write name="message"/><br> <!-- 对象类型的属性取出 --> <bean:write name="user" property="username"/><br> <bean:write name="user" property="password"/><br> <bean:write name="user" property="createDate" format="yyyy-MM-dd HH:mm:ss"/><br> <hr> <!-- List类型的属性取出 --> <logic:iterate id="user" name="userList"> <bean:write name="user" property="username"/><br> <bean:write name="user" property="password"/><br> <bean:write name="user" property="createDate" format="yyyy-MM-dd HH:mm:ss"/><br> </logic:iterate> <hr> <!-- Map类型的属性取出 --> <logic:iterate id="userIteam" name="userMap"> <bean:write name="userIteam" property="key"/><br> <bean:write name="userIteam" property="value.username"/><br> <bean:write name="userIteam" property="value.password"/><br> <bean:write name="userIteam" property="value.createDate" format="yyyy-MM-dd HH:mm:ss"/><br> </logic:iterate> </body> </html>
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