5.Struts2的OGNL表达式

1.创建javaweb项目Struts2_Part4_OGNL并在WebRoot下的WEB-INF下的lib文件夹下添加如下jar文件

 1 commons-fileupload-1.2.1.jar
 2 
 3 commons-io-1.3.2.jar
 4 
 5 freemarker-2.3.15.jar
 6 
 7 mybatis-3.2.2.jar
 8 
 9 ognl-2.7.3.jar
10 
11 ojdbc14.jar
12 
13 struts2-core-2.1.8.1.jar
14 
15 xwork-core-2.1.6.jar

所需要的jar

2.在src下创建struts.xml文件

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1.7//EN" "struts-2.1.7.dtd" >
 3 <struts>
 4   <!-- 中文乱码处理 -->
 5   <constant name="struts.i18n.encoding" value="UTF-8"/>
 6   <package name="default" namespace="/" extends="struts-default">
 7     <!-- 全局配置 -->
 8     <global-results>
 9       <result name="error">error.jsp</result>
10     </global-results>
11    
12     <!-- 时间格式化配置 -->
13     <action name="currentDate" class="com.action.DateFormatAction" method="getFormateDate">
14       <result name="success">ognldemo.jsp</result>
15     </action>
16     
17     <!-- Student的控制器的配置 -->
18     <action name="student" class="com.action.StudentAction" method="getInfo">
19       <result name="success">index.jsp</result>
20     </action>
21     
22     <!-- 详细信息的控制器的配置 -->
23     <action name="stuinfo" class="com.action.StuInfoAction" method="getInfo">
24       <result name="success">success.jsp</result>
25     </action>
26   </package>
27 </struts>

struts.xml

3.在src下的com.entity包下创建Student.java文件

 1 package com.entity;
 2 
 3 public class Student {
 4     private Integer sid;
 5     private String sname;
 6     
 7     
 8     public Student() {
 9     }
10     public Student(Integer sid, String sname) {
11         this.sid = sid;
12         this.sname = sname;
13     }
14     public Integer getSid() {
15         return sid;
16     }
17     public void setSid(Integer sid) {
18         this.sid = sid;
19     }
20     public String getSname() {
21         return sname;
22     }
23     public void setSname(String sname) {
24         this.sname = sname;
25     }
26     @Override
27     public String toString() {
28         return "Student [sid=" + sid + ", sname=" + sname + "]";
29     }
30 }

Student.java

4.在src下的com.action包下创建StudentAction.java文件

 1 package com.action;
 2 
 3 import com.entity.Student;
 4 import com.opensymphony.xwork2.ActionSupport;
 5 
 6 public class StudentAction extends ActionSupport {
 7     
 8 
 9 
10 @Override
11 public String execute() throws Exception {
12         
13         return ERROR;
14     }
15 
16 private Student stu;
17    public String getInfo(){
18        stu=new Student(1, "胡淑红");
19        return SUCCESS;
20    }
21 
22 public Student getStu() {
23     return stu;
24 }
25 
26 public void setStu(Student stu) {
27     this.stu = stu;
28 }
29    
30 }

StudentAction.java

5.在src下的com.action包下创建StuInfoAction.java文件

 1 package com.action;
 2 
 3 import java.util.ArrayList;
 4 import java.util.List;
 5 
 6 import com.entity.Student;
 7 import com.opensymphony.xwork2.ActionSupport;
 8 
 9 public class StuInfoAction extends ActionSupport{
10     private String[] ah;
11     private List<Student> list;
12     public String getInfo(){
13         if(ah!=null){
14             System.out.println("爱好是：");
15             for (int i = 0; i < ah.length; i++) {
16                 System.out.print(ah[i]+"，");
17             }
18         }else{
19             System.out.println("没有获取参数");
20             list=new ArrayList<Student>();
21             Student stu=new Student(1, "holly");
22             list.add(stu);
23         }
24         
25         return SUCCESS;
26     }
27 
28     public String[] getAh() {
29         return ah;
30     }
31 
32     public void setAh(String[] ah) {
33         this.ah = ah;
34     }
35 
36     public List<Student> getList() {
37         return list;
38     }
39 
40     public void setList(List<Student> list) {
41         this.list = list;
42     }
43 }

StuInfoAction.java

6.在src下的com.action包下创建DateFormatAction.java文件

 1 package com.action;
 2 
 3 import java.util.Date;
 4 
 5 import com.opensymphony.xwork2.ActionSupport;
 6 
 7 public class DateFormatAction extends ActionSupport {
 8     //1.定义私有的Date类型的对象
 9     private Date currentDate;
10     //2.action核心处理业务的方法
11     public String getFormateDate(){
12         
13         //创建Date对象，也就是给成员对象赋值
14         currentDate=new Date();
15         System.out.println("系统时间："+currentDate);
16         return SUCCESS;
17     }
18     //3.代理对象使用的getter和setter
19     public Date getCurrentDate() {
20         return currentDate;
21     }
22     public void setCurrentDate(Date currentDate) {
23         this.currentDate = currentDate;
24     }
25 }

DateFormatAction.java

7.在WebRoot下的WEB-INF下web.xml文件

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <web-app version="2.5" 
 3     xmlns="http://java.sun.com/xml/ns/javaee" 
 4     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
 5     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
 6     http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
 7 <filter>
 8  <filter-name>struts2</filter-name>
 9  <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
10 </filter>
11 <filter-mapping>
12  <filter-name>struts2</filter-name>
13  <url-pattern>/*</url-pattern>
14 
15 </filter-mapping>
16   <welcome-file-list>
17     <welcome-file>ognldemo.jsp</welcome-file>
18   </welcome-file-list>
19 </web-app>

web.xml

8.在WebRoot下创建ognldemo.jsp文件

 1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
 2 <%@taglib uri="/struts-tags" prefix="s"  %>
 3 <%
 4 String path = request.getContextPath();
 5 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
 6 %>
 7 
 8 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 9 <html>
10   <head>
11     <base href="<%=basePath%>">
12     
13     <title>My JSP 'index.jsp' starting page</title>
14     <meta http-equiv="pragma" content="no-cache">
15     <meta http-equiv="cache-control" content="no-cache">
16     <meta http-equiv="expires" content="0">    
17     <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
18     <meta http-equiv="description" content="This is my page">
19     <!--
20     <link rel="stylesheet" type="text/css" href="styles.css">
21     -->
22   </head>
23   
24   <body>
25   <!-- 在request作用域里设置age变量，值为18 -->
26   <s:set name="age" value="18" scope="request"/>
27   
28   <!-- 直接输出request作用域变量的值 -->
29   <s:property value="#request.age"/>
30   <s:property value="#attr.age"/>
31   
32   <!-- 在session作用域里设置name变量，值为holly -->
33   <s:set name="sname" value="'holly'" scope="session"/>
34   
35   <!-- 直接输出session作用域变量的值 -->
36   <s:property value="#session.sname"/>
37   <s:property value="#attr.sname"/>
38   
39   <!-- 在application作用域里设置sex变量，值为女 -->
40   <s:set name="sex" value="'女'" scope="application"/>
41   
42   <!-- 直接输出session作用域变量的值 -->
43   <s:property value="#application.sex"/>
44   <s:property value="#attr.sex"/>
45   
46   <!-- 格式化后台action发过来的Date类型的系统时间 -->
47   格式化的时间：<s:date name="currentDate" format="dd/MM/yyyy"/>
48   没有格式化：<s:date name="currentDate" />
49 
50   </body>
51 </html>

ognldemo.jsp

9.在WebRoot下创建index.jsp文件

 1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
 2 <%@taglib uri="/struts-tags" prefix="s" %>
 3 <%
 4 String path = request.getContextPath();
 5 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
 6 %>
 7 
 8 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 9 <html>
10   <head>
11     <base href="<%=basePath%>">
12     
13     <title>My JSP 'index.jsp' starting page</title>
14     <meta http-equiv="pragma" content="no-cache">
15     <meta http-equiv="cache-control" content="no-cache">
16     <meta http-equiv="expires" content="0">    
17     <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
18     <meta http-equiv="description" content="This is my page">
19     <!--
20     <link rel="stylesheet" type="text/css" href="styles.css">
21     -->
22   </head>
23   
24   <body>
25       学生编号：<s:property value="stu.sid"/>
26       学生姓名：<s:property value="stu.sname"/>
27      <form action="stuinfo" method="post">
28     爱好：
29        <input type="checkbox" name="ah" value="吃饭"/>吃饭
30        <input type="checkbox" name="ah" value="睡觉"/>睡觉
31        <input type="checkbox" name="ah" value="张乐素质很高"/>张乐素质很高
32       <input type="submit" value="提交"/>
33     </form> 
34   </body>
35 </html>

index.jsp

10.在WebRoot下创建success.jsp文件

 1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
 2 <%@ taglib uri="/struts-tags" prefix="s" %>
 3 <%
 4 String path = request.getContextPath();
 5 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
 6 %>
 7 
 8 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 9 <html>
10   <head>
11     <base href="<%=basePath%>">
12     
13     <title>My JSP 'index.jsp' starting page</title>
14     <meta http-equiv="pragma" content="no-cache">
15     <meta http-equiv="cache-control" content="no-cache">
16     <meta http-equiv="expires" content="0">    
17     <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
18     <meta http-equiv="description" content="This is my page">
19     <!--
20     <link rel="stylesheet" type="text/css" href="styles.css">
21     -->
22   </head>
23   
24   <body>
25      操作成功
26      属性获取：
27      <s:property value="ah[0]"/>
28     <s:property value="ah[1]"/>
29     <br/>
30     <s:iterator value="list">
31      sid:<s:property value="sid"/>
32      <br/>
33      sname:<s:property value="sname"/>
34     </s:iterator>
35     
36   </body>
37 </html>

success.jsp

11.在WebRoot下创建error.jsp文件

 1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
 2 <%
 3 String path = request.getContextPath();
 4 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
 5 %>
 6 
 7 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 8 <html>
 9   <head>
10     <base href="<%=basePath%>">
11     
12     <title>My JSP 'index.jsp' starting page</title>
13     <meta http-equiv="pragma" content="no-cache">
14     <meta http-equiv="cache-control" content="no-cache">
15     <meta http-equiv="expires" content="0">    
16     <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
17     <meta http-equiv="description" content="This is my page">
18     <!--
19     <link rel="stylesheet" type="text/css" href="styles.css">
20     -->
21   </head>
22   
23   <body>
24      操作失败
25   </body>
26 </html>

error.jsp

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原文地址：https://www.cnblogs.com/holly8/p/5831624.html