菜鸟学习Struts——bean标签库
最后更新于：2022-04-01 09:33:32
## 一、Struts标签库。
Struts实际上包含了4个标签库：bean，logic，html，tiles
bean：用来在属性范围中定义或取得属性的，同时可以读取资源文件信息
logic：替代JSTL中的判断和循环
html：替代页面表单，完成自动回填以及错误信息的显示
tiles：美工标签，用来进行页面布局的调整以及样式管理的。
## 二、各个标签库的实例
下面利用实例来为大家降解三个标签库： beanwrite标签库、logic标签库、iterate标签库
### 2.1 beanwrite标签
实现效果：
代码：
#### 2.1.1、[配置Struts环境](http://blog.csdn.net/gwblue/article/details/18367901)
#### 2.1.2、编写bean_write.jsp
~~~
<%@ page language="java" contentType="text/html; charset=GB18030"
pageEncoding="GB18030"%>
<%@ taglib uri="http://struts.apache.org/tags-bean" prefix="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>Insert title here</title>
</head>
<body>
<h1>测试beanWrite标签</h1><br>
<hr>
<li>普通字符串</li><br>
hello(标签):<bean:write name="hello"/>
<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"/>
<p>
<li>user</li><br>
姓名：<input type="text" name="username" value="<bean:write name='user' property='username'/>"><br>
年龄：<input type="text" name="age" value="<bean:write name='user' property='age'/>"><br>
所属组：<input type="text" name="group" value="<bean:write name='user' property='group.name'/>"><br>
</body>
</html>
~~~
#### 2.1.3、编写BeanWriteTestAction.java
~~~
package com.bjpowernode.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标签
* @author IT
*
*/
public class BeanWriteTestAction extends Action {
@Override
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws Exception {
//普通字符串
request.setAttribute("hello", "helloword");
//html文本
request.setAttribute("bj", "<font color='red'>北京欢迎你</font>");
//日期
request.setAttribute("today",new Date());
Group group=new Group();
group.setName("动力节点");
User user=new User();
user.setUsername("张三");
user.setAge(22);
user.setGroup(group);
request .setAttribute("user", user);
return mapping.findForward("success");
}
}
~~~
#### 2.1.4、编写实体类
User.java
~~~
package com.bjpowernode.struts;
/**
* User实体
* @author IT
*
*/
public class User {
//用户名字
private String username;
//年龄
private int age;
//组
private Group group;
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = 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.bjpowernode.struts;
/**
* 组的实体类
* @author IT
*
*/
public class Group {
//组名
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
~~~
#### 2.1.5、struts-config.xml配置
~~~
<?xml version="1.0" encoding="ISO-8859-1" ?>
<!DOCTYPE struts-config PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 1.2//EN"
"http://jakarta.apache.org/struts/dtds/struts-config_1_2.dtd">
<struts-config>
<action-mappings>
<action path="/beanwrite"
type="com.bjpowernode.struts.BeanWriteTestAction"
>
<forward name="success" path="/bean_write.jsp"></forward>
</action>
</action-mappings>
</struts-config>
~~~