velcoity使用说明：foreach指令

http://blog.csdn.net/madding/article/details/6641020当在velocity中需要显示一个列表信息，我们会用foreach循环输出，

要求：

假如现在需要在页面中输出单数的内容背景为红，双数的内容为黑，构造方式如下：

[java] view plain copy

package org.apache.velocity.test.issues;
import java.util.ArrayList;
import java.util.List;
import org.apache.velocity.test.BaseTestCase;
/**
* 测试foreach
* @author madding.lip at 2011.07.28
*/
public class MaddingTestForeach extends BaseTestCase {
public MaddingTestForeach(String name) {
super(name);
}
public void test() {
List<String> list = new ArrayList<String>();
for(int i = 1; i <= 100; i++) {
list.add(String.valueOf(i));
}
context.put("features", list);
String template =
"#foreach ($feature in $features)" +
"#if($velocityCount%2 == 1)" +
"<font color=\"red\">$feature</font>" +
"#elseif($velocityCount%2 == 0)" +
"<font color=\"black\">$feature</font>" +
"#end" +
"#if($velocityHasNext)" +
"|" +
"#end" +
"#end";
System.out.println(evaluate(template));
}
}

BaseTestCase是Velocity源代码中的测试类

说明：

1.#foreach是velocity指令，

2.velcotiyCount上， velocity foreach定义的一个变量，该变量主要用来记录当前的循环次数

3.velocityHasNext， velocity foreach定义的一个变量，表明该循环当前是否到尾部了

velocity.properties：

[plain] view plain copy

# ----------------------------------------------------------------------------
# F O R E A C H P R O P E R T I E S
# ----------------------------------------------------------------------------
# These properties control how the counter is accessed in the #foreach
# directive. By default the reference $velocityCount and $velocityHasNext
# will be available in the body of the #foreach directive.
# The default starting value for $velocityCount is 1.
# ----------------------------------------------------------------------------
directive.foreach.counter.name = velocityCount
directive.foreach.counter.initial.value = 1
directive.foreach.maxloops = -1
directive.foreach.iterator.name = velocityHasNext

实战记录

有一种情况就是在一个foreach下遍历两个list，那么肯定要是for(int i=0;i<...)这种数字计数形式。java中很好实现，velocity说是有个$velocityCount，但我发现不好用。它的值是从1开始的，而取list的第一个对象list.get(0)，所以我用计算方式($velocityCount-1)不行，好些无效，配置$velocityCount初始值为0，配置方式也无效

msgMap.put("directive.foreach.counter.initial.value", 0);
msgMap.put("insuranceCountList", insuranceCountList);

没办法了，我就再做一个数字数组或List，里面存储我需要的数字，专用来做迭代，比如手动做的list为insuranceCountList

<AA_INSURANCELIST>

## AA_INSURANCE信息

#foreach ($count in $insuranceCountList)

<AA_INSURANCE>

<NAME> $!{app.getComponent($insured).get($count).getCInsuredNme()} </NAME>

<AA_PLYNO> $!{app.getComponent($base).get($count).getCPlyNo()}</AA_PLYNO >

</AA_INSURANCE>

#end

</AA_INSURANCELIST>

注意的$velocityCount可以不用注入，velocity foreach中直接可使用，最后给一个实战配置模版例子

REQUEST_09.xml

<?xml version="1.0" encoding="GBK"?>

<PACKET type="REQUEST" version="1.0">

    #set($base="PlyMain")

    #set($insured="Insured")

    #set($contactInfo="ContactInfo")

    <HEAD>

        <REQUEST_TYPE>$!{REQUEST_TYPE}</REQUEST_TYPE>

        <USER>$!{USER}</USER>

        <PASSWORD>$!{PASSWORD}</PASSWORD>

    </HEAD>

     <BODY>

       <VOUCHER_FLAG>$!{app.getComponent($contactInfo).get(0).getCVoucherFlag()}</VOUCHER_FLAG>

       <AA_INSURANCELIST>

            ## AA_INSURANCE信息

         #foreach ($count in $AA_INSURANCECountList)

         <AA_INSURANCE>

           <NAME>$!{app.getComponent($insured).get($count).getCInsuredNme()}</NAME>

           <DD_PLYNO>$!{app.getComponent($base).get($count).getCDD_PLYNO()}</DD_PLYNO>

         </AA_INSURANCE>

         #end

       </AA_INSURANCELIST>

     </BODY>

</PACKET>

巴特西

velcoity使用说明：foreach指令

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