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Mon, 21 Aug 2006 04:52:00 GMT

BlogJava做�ؓjava的专业blog�Q�偶在这老写javascript ajax的东西，有些不合适�?br />
朋友�l�了个blog,专门放ajax的文章吧�Q�以后这专门写关于java的东西吧�?br />http://zkj.wisekernel.net

谢谢支持�?img src ="http://www.aygfsteel.com/zkjbeyond/aggbug/64760.html" width = "1" height = "1" />

原创专栏开源学�?/a> 2006-08-21 12:52 发表评论

webwork2.2.2 Value Stack

Mon, 24 Apr 2006 14:32:00 GMT

Said another way, let's say I have a value stack that consists of a
model and an action as follows:

[ model, action ]
here's how the following ognl would resolve:
[0] - a CompoundRoot object that contains our stack, [model, action]

[1] - another CompoundRoot that contains only [action]

[0].toString() - calls toString() on the first object in the value stack (excluding the CompoundRoot) that supports the toString() method

[1].foo - call getFoo() on the first object in the value stack starting from [OS:action] and excluding the CompoundRoot that supports a getFoo() method

以上是webwork文档中谈到Value Stack部分.看了有些晦�ӆ,我试验了�?与大家分�?(没看源代�?
Action:

public class HomeAction implements Action {
    private String name= "propertyOfAction";
    private Person person=null;
    private Collection collection = new ArrayList();
    public String execute() throws Exception {
        collection.add(new Person("zkj"));
        collection.add(new Person("yql"));
        collection.add(person);
        return SUCCESS;
    }
    public String getName() {
        return name;
    }
    public Person getPerson() {
        return person;
    }
    public Collection getCollection() {
        return collection;
    }
    public void setPerson(Person person) {
        this.person = person;
    }
}

在jsp��面�?

如果我们直接
输出com.founder.HomeAction@e3ffdf,com.opensymphony.xwork.DefaultTextProvider@d402dd]
输出
[com.opensymphony.xwork.DefaultTextProvider@d402dd]
一般我们在没有循环的情况下不用[0] [1] 可以直接讉K��

输出 propertyOfAction

那么[0] [1] 有什么用�?在��@环中��׃��现出来了.

<ww:iterator value="collection" status="person">
            <ww:if test="#person.first == true">
                [0] :<ww:property value="[0]"/>br>
                [1] :<ww:property value="[1]"/>br>
                [2] :<ww:property value="[2]"/>br>
            ww:if>
ww:iterator>

[0] :[com.founder.Person@b3a5a0, com.founder.HomeAction@e3ffdf, com.opensymphony.xwork.DefaultTextProvider@d402dd]
[1] :[com.founder.HomeAction@e3ffdf, com.opensymphony.xwork.DefaultTextProvider@d402dd]
[2] :[com.opensymphony.xwork.DefaultTextProvider@d402dd]
输出以上代码,说明在一层��@环中我们要访问[1]表示action对象.和没有��@环的[0]对应.

�ȝ��:

假如你用webworkNOUI标签,对于Value Stack,一般你不要考虑[1] [0]之类�?��C��一�?br />如果在��@环中action的collection属性时体内,用[1]可以讉K��action对象和对应的属�?

对于多层循环或复杂用�?我只能告诉你,你的设计有问�?重构Model代码�?

原创专栏开源学�?/a> 2006-04-24 22:32 发表评论

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webwork2.2.2 Value Stack