Struts2中OGNL语句访问普通属性无法取值

slowside45 2017-09-23 10:47:07

打算用Struts2实现一个读取数据并显示的小项目
Model：
Student类：



package OGNL;



public class Student {

	private String name;

	private int id;

	public String getName() {

		return name;

	}

	public void setName(String name) {

		this.name = name;

	}

	public int getId() {

		return id;

	}

	public void setId(int id) {

		this.id = id;

	}

	public String say() {

		return "调用方法成功";

	}

}

Action类：



package OGNL;



import java.util.Map;



import com.opensymphony.xwork2.ActionContext;

import com.opensymphony.xwork2.ActionSupport;



public class OGNLAction extends ActionSupport {

	

	private static final long serialVersionUID = 1L;

	private Student stu;

	private String name;

	Map<String,Object> request; 

	@SuppressWarnings("unchecked")

	public OGNLAction() {

		stu = new Student();

		stu.setName("富贵");

		stu.setId(1);

		name = "Tom";

		request = (Map<String, Object>) ActionContext.getContext().get("request");

	}

	public String execute() throws Exception{

		request.put("info","request测试");

		return SUCCESS;

	}

	public String getName() {

		return name;

	}

	public void setName(String name) {

		this.name = name;

	}

	public Student getStudent() {

		return this.stu;

	}

	public void setStudent(Student stu) {

		this.stu = stu;

		

	}

}

View：
ognl_index.jsp：



<body>

<a href="ognl.action">OGNL测试</a>

</body>

ognl_success.jsp



<body>

<div>



		<h1>操作普通属性</h1>

		属性name值：<s:property value="name"/>

		<br><hr>

		学号：<s:property value="stu.id"/><br>

		     //问题就出在这里，stu是我创建好了的引用，却无法显示在JSP页面上，把stu改成student后就可以显示了

		姓名：<s:property value="student.name"/><br>

		say()方法：<s:property value="student.say()"/>    //而student这个引用名我从未创建过，却可以取值并显示在JSP页面上

		<br><hr>

		request中的info值：<s:property value="#request.info"/>

</div>

</body>

Controller：
struts.xml：
<constant name="strut.devMode" value="true"></constant>
<package name="myPackage" extends="struts-default" >

<action name="ognl" class="OGNL.OGNLAction">
<result name="success">ognl_success.jsp</result>
</action>
</package>

运行结果：