Apache Velocity 访问在 Java 代码中创建的字符串数组? [英] Apache Velocity access String array created in Java code?

问题描述

我正在尝试访问我在 Java 类中创建的字符串数组.字符串数组使用相同的键存储在名为notSelected"的 Map 中.

I am trying to access a String array which i have created in my Java class. The string array is stored in a Map with the name 'notSelected' using the same key.

我还有一个名为testString"的字符串对象存储在同一个 Map 中，我可以使用以下方法轻松访问和显示:

I also have a single String object called 'testString' stored in the same Map which i can easily access and display using:

$testString

但是，我如何从速度模板对象内的 Map 访问 String 数组对象(notSelected)?

However how do i go about accessing the String array object (notSelected) from the Map inside the velocity template object?

我试过了:

$notSelected.get(0)
$notSelected[0]
$notSelected.[0]
${notSelected}.get(0)

最后三个好像返回了String数组对象的内存位置的引用值，但是我还是访问不到数组里面的值.

The last three seem to return the reference value of the memory location of the String array object but i still can't access the values inside the array.

非常感谢任何帮助.谢谢

Any help is gladly appreciated. Thanks

Java 代码如下:

public Map<String, Object> getVelocityParameters
        (final Issue issue, final CustomField field, final FieldLayoutItem fieldLayoutItem) {
    final Map<String, Object> map = super.getVelocityParameters(issue, field, fieldLayoutItem);
    String[] notSelected = {"foo", "bar", "baz"};
    map.put("notSelected", notSelected);

    String[] selected = {"foo", "bar", "baz"};
    map.put("selected", selected);

    //this code works and i can access $testString in the velocity template
    String testString = "Test Worked";
    map.put("testString", testString);

    return map;
}

推荐答案

JIRA 使用旧版本的 Velocity，该版本不支持用于访问数组的数组索引符号.相反，使用 List 和 .get(n) 表示法:

JIRA uses an older version of Velocity that does not support array index notation for accessing arrays. Instead, use a List and .get(n) notation:

List foo = new ArrayList() {{ add("hi"); add("there"); }};

$foo.get(0)
$foo.get(1)

请记住，像您所处的环境这样的小细节可能会产生巨大的影响(当有人提出问题时，可能会有提出问题的理由；)

And remember, little tidbits of info like the environment you're operating in can make a huge difference (and when someone asks a question, there may be a reason for asking it ;)

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