struts2标签

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1. struts2标签
   

Struts2自己封装了一套标签，比JSTL强大，而且与Struts2中的其他功能无缝结合。
当然Strust2标签的内容很多，随着版本的升级，标签和属性越来越多。我们要掌握好核心标签及了解其他标签；
根据功能可以分为：数据标签，控制标签，界面标签，其他标签；

新建项目HeadFirstStruts2Chap05

MyComparator.java

package com.andrew.comparator;
import java.util.Comparator;
import com.andrew.model.Student;
public class MyComparator implements Comparator {
    public int compare(Student s1, Student s2) {
        if (s1.getAge() > s2.getAge()) {
            return 1;
        } else if (s1.getAge() < s2.getAge()) {
            return -1;
        }
        return 0;
    }
}

Student.java

package com.andrew.model;
public class Student {
    private int id;
    private String name;
    private int age;
    public Student() {}
    public Student(int id, String name, int age) {
        this.id = id;
        this.name = name;
        this.age = age;
    }
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
}

struts.xml



jsp

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

2. Struts2数据标签

1) property标签：输出OGNL表达式的值

<% request.setAttribute("name","张三"); %>







http://localhost:8080/HeadFirstStruts2Chap05/data/property.jsp
张三
某某人
张三

2) set标签：设置变量

http://localhost:8080/HeadFirstStruts2Chap05/data/set.jsp
1
action范围的值
page范围的值
request范围的值
session范围的值
application范围的值

3) bean标签：定义javaBean对象

    
    
 



http://localhost:8080/HeadFirstStruts2Chap05/data/bean.jsp
张三 10

4) date标签：日期标签

<%    request.setAttribute("date",new Date()); %>
${date }

当前日期：

http://localhost:8080/HeadFirstStruts2Chap05/data/date.jsp
Sat Jan 05 15:44:04 CST 2018
当前日期：2018-01-05

5) debug标签：调试标签

6) url&a标签：超链接标签

    

超链接

    
    超链接2


http://localhost:8080/HeadFirstStruts2Chap05/foreground/hello.action?name=struts2
http://localhost:8080/HeadFirstStruts2Chap05/foreground/hello.action?name=struts2

7) include标签：动态包含标签

head.html

头部

http://localhost:8080/HeadFirstStruts2Chap05/data/include.jsp
头部

3.  Struts2控制标签

1) ifelse标签：条件判断标签

<%    int age=11;
    request.setAttribute("age",age); %>
年龄小于20岁
年龄等于20岁
年龄大于20岁

年龄小于20岁 

2) iterator标签：遍历标签

<%@ page import="com.andrew.model.Student" %>
<%@ page import="java.util.*" %>
<%
    List studentList=new ArrayList();
    studentList.add(new Student(1,"张三",10));
    studentList.add(new Student(3,"李四",20));
    studentList.add(new Student(5,"王五",30));
    request.setAttribute("studentList",studentList);
%>

    

    
序号
编号
姓名
年龄
    

        

        

        

        

    
    


http://localhost:8080/HeadFirstStruts2Chap05/control/iterator.jsp
序号 编号 姓名 年龄
1 1 张三 10 
2 3 李四 20 
3 5 王五 30

3) append标签：叠加标签

<%@ page import="com.andrew.model.Student" %>
<%@ page import="java.util.*" %>
<%
    List studentList1=new ArrayList();
    List studentList2=new ArrayList();
    studentList1.add(new Student(1,"张三",10));
    studentList1.add(new Student(3,"李四",20));
    studentList2.add(new Student(5,"王五",30));
    studentList2.add(new Student(7,"赵六",40));
    request.setAttribute("studentList1",studentList1);
    request.setAttribute("studentList2",studentList2);
%>

    
    


    

    
序号
编号
姓名
年龄
    

        

        

        

        

    
    


http://localhost:8080/HeadFirstStruts2Chap05/control/append.jsp
序号 编号 姓名 年龄
1 1 张三 10 
2 3 李四 20 
3 5 王五 30 
4 7 赵六 40

4) generator标签：分隔标签

    


http://localhost:8080/HeadFirstStruts2Chap05/control/generator.jsp
张三 李四 王五

5) merge标签：组合标签

<%@ page import="com.andrew.model.Student" %>
<%@ page import="java.util.*" %>
<%
    List studentList1=new ArrayList();
    List studentList2=new ArrayList();
    studentList1.add(new Student(1,"张三",10));
    studentList1.add(new Student(3,"李四",20));
    studentList2.add(new Student(5,"王五",30));
    studentList2.add(new Student(7,"赵六",40));
    request.setAttribute("studentList1",studentList1);
    request.setAttribute("studentList2",studentList2);
%>

    
    


    

    
序号
编号
姓名
年龄
    

        

        

        

        

    
    


http://localhost:8080/HeadFirstStruts2Chap05/control/merge.jsp
序号 编号 姓名 年龄
1 1 张三 10 
2 5 王五 30 
3 3 李四 20 
4 7 赵六 40 

6) sort标签：排序标签

<%@ page import="com.andrew.model.Student" %>
<%@ page import="java.util.*" %>
<%
    List studentList1=new ArrayList();
    studentList1.add(new Student(1,"张三",20));
    studentList1.add(new Student(3,"李四",10));
    studentList1.add(new Student(5,"王五",40));
    studentList1.add(new Student(7,"赵六",30));
    request.setAttribute("studentList1",studentList1);
%>


    
    

    
序号
编号
姓名
年龄
    

        

        

        

        

    
    
    


http://localhost:8080/HeadFirstStruts2Chap05/control/sort.jsp
序号 编号 姓名 年龄
1 3 李四 10 
2 1 张三 20 
3 7 赵六 30 
4 5 王五 40

7) subset标签：截取标签

<%@ page import="com.andrew.model.Student" %>
<%@ page import="java.util.*" %>
<%
    List studentList1=new ArrayList();
    studentList1.add(new Student(1,"张三",20));
    studentList1.add(new Student(3,"李四",10));
    studentList1.add(new Student(5,"王五",40));
    studentList1.add(new Student(7,"赵六",30));
    request.setAttribute("studentList1",studentList1);
%>

    
    

    
序号
编号
姓名
年龄
    

        

        

        

        

    
    
    


http://localhost:8080/HeadFirstStruts2Chap05/control/subset.jsp
序号 编号 姓名 年龄
1 5 王五 40 
2 7 赵六 30 

4. Strut2界面标签

1) form标签：表单提交标签

http://localhost:8080/HeadFirstStruts2Chap05/ui/form.jsp

2) text标签：文本标签

用户名：

密码：

备注：


http://localhost:8080/HeadFirstStruts2Chap05/ui/text.jsp

3) radios标签：单选标签

性别：

http://localhost:8080/HeadFirstStruts2Chap05/ui/radio.jsp

4) checkboxlist标签：复选框标签

爱好：

http://localhost:8080/HeadFirstStruts2Chap05/ui/checkbox.jsp

5) select标签：下拉框标签

爱好：

http://localhost:8080/HeadFirstStruts2Chap05/ui/select.jsp

5. 其他标签

1) updownselect标签

 

http://localhost:8080/HeadFirstStruts2Chap05/ui/updownselect.jsp

2) optiontransferselect标签

   

http://localhost:8080/HeadFirstStruts2Chap05/ui/optiontransferselect.jsp