如何通过jsp中的`get()`方法访问对象? [英] How to access an object via a method `get()` in jsp?

问题描述

我有一个包含Google/番石榴Optional的容器对象，并且我想在jsp中访问该Optinal的内容.

I have an container object that contains a google/Guava Optional and I want to access the content of this Optinal in jsp.

import com.google.common.base.Optional;
public class Container {       
   private Optional<User> user;
   public Optional<User> getUser(){return this.user;}
}

public class User{
   private String name;
   public String getName() {return this.name;}
}

A Optional具有获取内部对象的方法get(). http://docs.guava-libraries.googlecode.com/git/javadoc/com/google/common/base/Optional.html#get%28%29

A Optional has a method get() to obtain the inner object. http://docs.guava-libraries.googlecode.com/git/javadoc/com/google/common/base/Optional.html#get%28%29

我已经尝试过(${container}在Container的实例中):

I have already tried (${container} ins an instance of Container):

<c:out value="${container.user.name}" />
<c:out value="${container.user.get.name}" />
<c:out value="${container.user..name}" />

它们都不起作用(Tomcat 7.42).有没有人知道如何解决这个问题，不向容器(getUser2(){return this.user.get();})添加新属性?

none of them work (Tomcat 7.42). Does anybody has an idea how to solve this, without adding a new property to the container (getUser2(){return this.user.get();})?

推荐答案

感谢Sotirios Delimanolis

Thanks to Sotirios Delimanolis

从Servlet 3.0/JSP 2.2开始就可以使用

since Servlet 3.0 / JSP 2.2 one can use

 <c:out value="${container.user.get().name}" />

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