hardson — Wed, 02 Aug 2006 14:59:00 GMT

Struts的Indexed属性用�?/h3>

banq http://www.jdon.com Mar 3, 2004 4:19 PM 回复

说明�Q�这是Struts的一�U�高�U�用法，struts-el中有相关说明�Q�这里讨论在一般struts标签库下如何实现�?br />
场景�Q?br />有一个JavaBeans:如下�Q?br />

publicclass LabelValueBean implements Serializable {
public LabelValueBean(String label, String value) {
this.label = label;
this.value = value;
}
private String label;

public String getLabel() {
returnthis.label;
}

publicvoid setLabel(String label) {
this.label = label;
}

private String value;

public String getValue() {
returnthis.value;
}

publicvoid setValue(String value) {
this.value = value;
}

public String toString() {
StringBuffer sb = new StringBuffer("LabelValueBean[");
sb.append(this.label);
sb.append(", ");
sb.append(this.value);
sb.append("]");
return (sb.toString());
}

}

�q�是非常普通的JavaBeans, 如果ActionForm是这��P��

publicclass TestBean extends ActionForm �?br />
.....
private List lvbeans = new ArrayList();

.....
�?br />

lvbeans是LabelValueBean的集合，如此�l�合�Q�如果需要在Jsp��面中对LabelValueBean的label和value��D��行增删改�Q�怎么办？

使用indexed属性，TestBean�c�d��下：

publicclass TestBean extends ActionForm �?br />
.....
private List lvbeans = new ArrayList();

public TestBean(){ //初始化数�?/font>
lvbeans.add(new LabelValueBean("1", "1"));
lvbeans.add(new LabelValueBean("2", "2"));
lvbeans.add(new LabelValueBean("3", "3"));

}

public LabelValueBean getLvbeans(int index) {
return (LabelValueBean)lvbeans.get(index);
}

public List getLvbeans() {
return lvbeans;
}

.....
�?br />

注意上述两个get�Ҏ(gu��)��很重要，Jsp��面代码如下�Q?br />

<%@ taglib uri="/WEB-INF/struts-logic.tld" prefix="logic" %>
<%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean" %>
<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %>

"test2" scope="page"class="test.TestBean"/>

Test:
"test2" property="lvbeans" id="foo" indexId="ctr">
"test2"
property='<%= "lvbeans[" + ctr + "].label" %>' />

�q�样�Q�运行后的输出结果是�Q?br />

Test:

"text" name="lvbeans[0].label" value="1">

"text" name="lvbeans[1].label" value="2">

"text" name="lvbeans[2].label" value="3">

�q�样修改TestBean中的List中的LabelValueBean数��g��?br />

hardson 2006-08-02 22:59 发表评论

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Test:"test2" property="lvbeans" id="foo" indexId="ctr">"test2"property='<%= "lvbeans[" + ctr + "].label" %>' />

Test:"text" name="lvbeans[0].label" value="1">"text" name="lvbeans[1].label" value="2">"text" name="lvbeans[2].label" value="3">

Test:
"test2" property="lvbeans" id="foo" indexId="ctr">
"test2"
property='<%= "lvbeans[" + ctr + "].label" %>' />

Test:

"text" name="lvbeans[0].label" value="1">

"text" name="lvbeans[1].label" value="2">

"text" name="lvbeans[2].label" value="3">