struts2--使用OGNL获取数据

末蓝、 2024-02-18 14:20 2阅读 0赞

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显示界面：

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值栈信息：

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登录页面(index.jsp)：

LoginAction:

package com.action;
 
 import java.util.ArrayList;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
 
 import javax.servlet.http.HttpServletRequest;
 
 import org.apache.struts2.ServletActionContext;
 
 import javassist.compiler.ast.NewExpr;
 
 import com.bean.User;
 import com.opensymphony.xwork2.ActionContext;
 import com.opensymphony.xwork2.ActionSupport;
 
 public class LoginAction extends ActionSupport{
 	private User user;
 	private List<User> users;
 	private List list;
 
 	public String execute(){
 		list = new ArrayList();
 		User user1 = new User("英男","123456",19);
 		User user2 = new User("王虎","234567",35);
 		list.add(user1);
 		list.add(user2);
 		
 		HttpServletRequest request= ServletActionContext.getRequest();
 		request.setAttribute("user", user.getUsername());
 		Map session = ActionContext.getContext().getSession();
 		session.put("user", user.getPassword());
 		Map application = ActionContext.getContext().getApplication();
 		application.put("user", user.getAge());
 		
 		users = new LinkedList<User>();
 		users.add(new User("王环","883456",25));
 		users.add(new User("张辽","166556",29));
 		users.add(new User("薛平","135112",36));
 		users.add(new User("蕾丝","452122",31));
 		return SUCCESS;
 	}
 	
 	public User getUser() {
 		return user;
 	}
 
 	public void setUser(User user) {
 		this.user = user;
 	}
 
 	public List<User> getUsers() {
 		return users;
 	}
 
 	public void setUsers(List<User> users) {
 		this.users = users;
 	}
 
 	public List getList() {
 		return list;
 	}
 
 	public void setList(List list) {
 		this.list = list;
 	}
 
 }

javaBean:

package com.bean;
    
    public class User {
    	private String username;
    	private String password;
    	private String sex;
    	private Integer age;
    
    	public User() {}
    	
    	public User(String username,String password,Integer age){
    		this.username = username;
    		this.password = password;
    		this.age = age;
    	}
    	
    	public String getUsername() {
    		return username;
    	}
    
    	public void setUsername(String username) {
    		this.username = username;
    	}
    
    	public String getPassword() {
    		return password;
    	}
    
    	public void setPassword(String password) {
    		this.password = password;
    	}
    
    	public String getSex() {
    		return sex;
    	}
    
    	public void setSex(String sex) {
    		this.sex = sex;
    	}
    
    	public Integer getAge() {
    		return age;
    	}
    
    	public void setAge(Integer age) {
    		this.age = age;
    	}
    
    }

输出界面(ognl.jsp):

<body>
 <s:debug/>
 获取request:<s:property value = "#request.user"/> 
 获取session:<s:property value = "#session.user"/> 
 获取application:<s:property value = "#application.user"/> 
 获取list属性信息:
 <s:property value = "list[0].username"/>
 <s:property value = "list[0].password"/>
 <s:property value = "list[0].age"/>
 
 静态属性:
 <s:property value = "@java.lang.Math@PI"/> 
 年龄大于30的人：
 <ul>
 <s:iterator value = "users.{?#this.age>30}">
 <li>
 <s:property value = "username"/>
 <s:property value = "age"/>
 </li>
 </s:iterator>
 </ul>
 </body>

struts.xml配置：

<?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE struts PUBLIC
 "-//Apache Software Foundation//DTD Struts Configuration 2.1.7//EN"
 "http://struts.apache.org/dtds/struts-2.1.7.dtd">
 
 <struts>
 <package name="default" namespace = "/" extends="struts-default">
 <action name = "login" class = "com.action.LoginAction">
 <result>/ognl.jsp</result>
 </action>
 </package>
 </struts>

[Center]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/29/4215f6bf2048485784f3fcc73ccb124c.png
[Center 1]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/29/baf8a6fa8e3e4718a58cd09e6f95bd40.png
[Center 2]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/29/e57bd8dd96db4c668f2230692327f900.png