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