struts2 可以用ognl拿到值而不可以用el拿到值的解决方法

错误debug后

得到了There is no read method for container的错误

于是我new了一个实体类

 package com.unity;

 public class Student {
     private String studentName;

     public Student(String studentName) {
         this.studentName = studentName;
     }

     public String getStudentName() {
         return studentName;
     }
 //
     public void setStudentName(String studentName) {
         this.studentName = studentName;
     }
 }

并在action导入

 package com.action;

 import com.opensymphony.xwork2.ActionContext;
 import com.opensymphony.xwork2.ActionSupport;
 import com.opensymphony.xwork2.util.ValueStack;
 import com.unity.Student;

 public class HelloWorldAction extends ActionSupport {
     /**
      *
      */
     private static final long serialVersionUID = -7840227232203094654L;
     private String studentName;

     public String getStudentName() {
         return studentName;
     }

     public void setStudentName(String studentName) {
         this.studentName = studentName;
     }

     private String password;

     public String execute() {
         System.out.println("execute.....");
         System.out.println("studentName:" + studentName);
         System.out.println("password:" + password);
         // ValueStack vs=ActionContext.getContext().getValueStack();
         ActionContext context = ActionContext.getContext();
         ValueStack vs = context.getValueStack();
         // 值栈的栈顶

         Student student = new Student("111111");

         vs.push(student);
         return "info";
     }

     public String getPassword() {
         return password;
     }

     public void setPassword(String password) {
         this.password = password;
     }
 }

虽然没有了There is no read method for container的错误

但是依然无法用el得到值

所以debug可以去死了

后来直接翻墙啃英文的狗屎

发现有一个版本的structs2

默认关了页面的el表达式

强制你使用ognl.........

最终解决方法

 <%@ page language="java" contentType="text/html; charset=UTF-8"
     pageEncoding="UTF-8" isELIgnored="false"%>

//isELIgnored 是否无视el表达式 重新设置为false

但是我后来发现第二个解决方法

同一版本的structs2在不使用maven的情况下

倒没有出现这样的问题

最后总结

为了规范，哥们在maven的情况下，用struts2就用ogln吧，硬是用el加上那句isELIgnored="false"就行了 ，

最后放点取值的方法

         <br> 密码:${password }
     <br> 姓名1:<%=request.getParameter("studentName")%>
     <br> 姓名2:${studentName}
     <br> 姓名3:
     <s:property value="[0].studentName" />
     <br> 姓名4:
     <s:property value="[1].studentName" />
     <br> 姓名5:${requestScope.studentName}    

 public class HelloWorldAction extends ActionSupport {
     /**
      *
      */
     private static final long serialVersionUID = -7840227232203094654L;
     private String studentName;

     public String getStudentName() {
         return studentName;
     }

     public void setStudentName(String studentName) {
         this.studentName = studentName;
     }

     private String password;

     public String execute() {
         System.out.println("execute.....");
         System.out.println("studentName:" + studentName);
         System.out.println("password:" + password);
         // ValueStack vs=ActionContext.getContext().getValueStack();
         ActionContext context = ActionContext.getContext();
         ValueStack vs = context.getValueStack();
         // 值栈的栈顶
         Student student = new Student("111111");
         vs.push(student);
         return "info";
     }

     public String getPassword() {
         return password;
     }

     public void setPassword(String password) {
         this.password = password;
     }
 }

 public class Student {
     private String studentName;

     public Student(String studentName) {
         this.studentName = studentName;
     }

     public String getStudentName() {
         return studentName;
     }
 //
     public void setStudentName(String studentName) {
         this.studentName = studentName;
     }
 }

图片