一、Json 生成器 JsonBuilder

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JsonBuilder 原型如下 , 该类继承自 GroovyObjectSupport 类 , 其核心是 invokeMethod , 利用元编程实现 Json 生成器的作用 , 帮助生成 Json 字符串 ;

public class JsonBuilder extends GroovyObjectSupport implements Writable {public Object invokeMethod(String name, Object args) {if (args != null && Object[].class.isAssignableFrom(args.getClass())) {Object[] arr = (Object[]) args;if (arr.length == 0) {return setAndGetContent(name, new HashMap<String, Object>());} else if (arr.length == 1) {if (arr[0] instanceof Closure) {return setAndGetContent(name, JsonDelegate.cloneDelegateAndGetContent((Closure) arr[0]));} else if (arr[0] instanceof Map) {return setAndGetContent(name, arr[0]);}} else if (arr.length == 2)  {if (arr[0] instanceof Map && arr[1] instanceof Closure) {Map subMap = new LinkedHashMap();subMap.putAll((Map) arr[0]);subMap.putAll(JsonDelegate.cloneDelegateAndGetContent((Closure) arr[1]));return setAndGetContent(name, subMap);} else if (arr[0] instanceof Collection && arr[1] instanceof Closure) {List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();for (Object it : (Collection) arr[0]) {list.add(JsonDelegate.curryDelegateAndGetContent((Closure) arr[1], it));}return setAndGetContent(name, list);}}throw new JsonException("Expected no arguments, a single map, a single closure, or a map and closure as arguments.");} else {return setAndGetContent(name, new HashMap<String, Object>());}}
}

二、Xml 生成器 MarkupBuilder

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MarkupBuilder 继承了 BuilderSupport 类 , 其原型如下 , 其中封装了一系列的方法 , 帮助生成 Xml 文件 ;

public class MarkupBuilder extends BuilderSupport {}

三、Swing 生成器 SwingBuilder

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Swing 生成器 SwingBuilder , 继承 FactoryBuilderSupport 类 ;

public class SwingBuilder extends FactoryBuilderSupport {
}