{"id":602,"date":"2015-04-30T19:21:52","date_gmt":"2015-04-30T11:21:52","guid":{"rendered":"https:\/\/ai.zhousir.top\/?p=602"},"modified":"2015-04-30T19:23:10","modified_gmt":"2015-04-30T11:23:10","slug":"%e8%ae%be%e8%ae%a1%e6%a8%a1%e5%bc%8f%e4%b9%8bdecorator%e6%b2%b9%e6%bc%86%e5%b7%a5","status":"publish","type":"post","link":"https:\/\/ai.zhousir.top\/?p=602","title":{"rendered":"\u8bbe\u8ba1\u6a21\u5f0f\u4e4bDecorator(\u6cb9\u6f06\u5de5)"},"content":{"rendered":"

\u88c5\u9970\u6a21\u5f0f:Decorator\u5e38\u88ab\u7ffb\u8bd1\u6210”\u88c5\u9970”,\u6211\u89c9\u5f97\u7ffb\u8bd1\u6210”\u6cb9\u6f06\u5de5”\u66f4\u5f62\u8c61\u70b9,\u6cb9\u6f06\u5de5(decorator)\u662f\u7528\u6765\u5237\u6cb9\u6f06\u7684,\u90a3\u4e48\u88ab\u5237\u6cb9\u6f06\u7684\u5bf9\u8c61\u6211\u4eec\u79f0decoratee.\u8fd9\u4e24\u79cd\u5b9e\u4f53\u5728Decorator\u6a21\u5f0f\u4e2d\u662f\u5fc5\u987b\u7684.
\n<\/p>\n

Decorator\u5b9a\u4e49:
\n\u52a8\u6001\u7ed9\u4e00\u4e2a\u5bf9\u8c61\u6dfb\u52a0\u4e00\u4e9b\u989d\u5916\u7684\u804c\u8d23,\u5c31\u8c61\u5728\u5899\u4e0a\u5237\u6cb9\u6f06.\u4f7f\u7528Decorator\u6a21\u5f0f\u76f8\u6bd4\u7528\u751f\u6210\u5b50\u7c7b\u65b9\u5f0f\u8fbe\u5230\u529f\u80fd\u7684\u6269\u5145\u663e\u5f97\u66f4\u4e3a\u7075\u6d3b.<\/p>\n

\u4e3a\u4ec0\u4e48\u4f7f\u7528Decorator?
\n\u6211\u4eec\u901a\u5e38\u53ef\u4ee5\u4f7f\u7528\u7ee7\u627f\u6765\u5b9e\u73b0\u529f\u80fd\u7684\u62d3\u5c55,\u5982\u679c\u8fd9\u4e9b\u9700\u8981\u62d3\u5c55\u7684\u529f\u80fd\u7684\u79cd\u7c7b\u5f88\u7e41\u591a,\u90a3\u4e48\u52bf\u5fc5\u751f\u6210\u5f88\u591a\u5b50\u7c7b,\u589e\u52a0\u7cfb\u7edf\u7684\u590d\u6742\u6027,\u540c\u65f6,\u4f7f\u7528\u7ee7\u627f\u5b9e\u73b0\u529f\u80fd\u62d3\u5c55,\u6211\u4eec\u5fc5\u987b\u53ef\u9884\u89c1\u8fd9\u4e9b\u62d3\u5c55\u529f\u80fd,\u8fd9\u4e9b\u529f\u80fd\u662f\u7f16\u8bd1\u65f6\u5c31\u786e\u5b9a\u4e86,\u662f\u9759\u6001\u7684.<\/p>\n

\u4f7f\u7528Decorator\u7684\u7406\u7531\u662f:\u8fd9\u4e9b\u529f\u80fd\u9700\u8981\u7531\u7528\u6237\u52a8\u6001\u51b3\u5b9a\u52a0\u5165\u7684\u65b9\u5f0f\u548c\u65f6\u673a.Decorator\u63d0\u4f9b\u4e86”\u5373\u63d2\u5373\u7528”\u7684\u65b9\u6cd5,\u5728\u8fd0\u884c\u671f\u95f4\u51b3\u5b9a\u4f55\u65f6\u589e\u52a0\u4f55\u79cd\u529f\u80fd.<\/p>\n

\u5982\u4f55\u4f7f\u7528?
\n\u4e3eAdapter\u4e2d\u7684\u6253\u6869\u793a\u4f8b,\u5728Adapter\u4e2d\u6709\u4e24\u79cd\u7c7b:\u65b9\u5f62\u6869 \u5706\u5f62\u6869,Adapter\u6a21\u5f0f\u5c55\u793a\u5982\u4f55\u7efc\u5408\u4f7f\u7528\u8fd9\u4e24\u4e2a\u7c7b,\u5728Decorator\u6a21\u5f0f\u4e2d,\u6211\u4eec\u662f\u8981\u5728\u6253\u6869\u65f6\u589e\u52a0\u4e00\u4e9b\u989d\u5916\u529f\u80fd,\u6bd4\u5982,\u6316\u5751 \u5728\u6869\u4e0a\u9489\u6728\u677f\u7b49,\u4e0d\u5173\u5fc3\u5982\u4f55\u4f7f\u7528\u4e24\u4e2a\u4e0d\u76f8\u5173\u7684\u7c7b.<\/p>\n

\u6211\u4eec\u5148\u5efa\u7acb\u4e00\u4e2a\u63a5\u53e3:<\/p>\n

[java]public interface Work
\n{
\n\u3000\u3000public void insert();<\/p>\n

}
\n[\/java]<\/p>\n

\u63a5\u53e3Work\u6709\u4e00\u4e2a\u5177\u4f53\u5b9e\u73b0:\u63d2\u5165\u65b9\u5f62\u6869\u6216\u5706\u5f62\u6869,\u8fd9\u4e24\u4e2a\u533a\u522b\u5bf9Decorator\u662f\u65e0\u6240\u8c13.\u6211\u4eec\u4ee5\u63d2\u5165\u65b9\u5f62\u6869\u4e3a\u4f8b:<\/p>\n

[java]public class SquarePeg implements Work{
\n\u3000\u3000public void insert(){
\n\u3000\u3000\u3000\u3000System.out.println("\u65b9\u5f62\u6869\u63d2\u5165");
\n\u3000\u3000}
\n}
\n[\/java]<\/p>\n

\u73b0\u5728\u6709\u4e00\u4e2a\u5e94\u7528:\u9700\u8981\u5728\u6869\u6253\u5165\u524d,\u6316\u5751,\u5728\u6253\u5165\u540e,\u5728\u6869\u4e0a\u9489\u6728\u677f,\u8fd9\u4e9b\u989d\u5916\u7684\u529f\u80fd\u662f\u52a8\u6001,\u53ef\u80fd\u968f\u610f\u589e\u52a0\u8c03\u6574\u4fee\u6539,\u6bd4\u5982,\u53ef\u80fd\u53c8\u9700\u8981\u5728\u6253\u6869\u4e4b\u540e\u9489\u67b6\u5b50(\u53ea\u662f\u6bd4\u55bb).<\/p>\n

\u90a3\u4e48\u6211\u4eec\u4f7f\u7528Decorator\u6a21\u5f0f,\u8fd9\u91cc\u65b9\u5f62\u6869SquarePeg\u662fdecoratee(\u88ab\u5237\u6cb9\u6f06\u8005),\u6211\u4eec\u9700\u8981\u5728decoratee\u4e0a\u5237\u4e9b”\u6cb9\u6f06”,\u8fd9\u4e9b\u6cb9\u6f06\u5c31\u662f\u90a3\u4e9b\u989d\u5916\u7684\u529f\u80fd.<\/p>\n

[java]public class Decorator implements Work{<\/p>\n

\u3000\u3000private Work work;
\n\u3000\u3000\/\/\u989d\u5916\u589e\u52a0\u7684\u529f\u80fd\u88ab\u6253\u5305\u5728\u8fd9\u4e2aList\u4e2d
\n\u3000\u3000private ArrayList others = new ArrayList(); <\/p>\n

\u3000\u3000\/\/\u5728\u6784\u9020\u5668\u4e2d\u4f7f\u7528\u7ec4\u5408new\u65b9\u5f0f,\u5f15\u5165Work\u5bf9\u8c61;
\n\u3000\u3000public Decorator(Work work)
\n\u3000\u3000{
\n\u3000\u3000\u3000\u3000this.work=work;
\n\u3000\u3000
\n\u3000\u3000\u3000\u3000others.add("\u6316\u5751");<\/p>\n

\u3000\u3000\u3000\u3000others.add("\u9489\u6728\u677f");
\n\u3000\u3000}<\/p>\n

\u3000\u3000public void insert(){<\/p>\n

\u3000\u3000\u3000\u3000newMethod();
\n\u3000\u3000} <\/p>\n

\u3000\u3000
\n\u3000\u3000\/\/\u5728\u65b0\u65b9\u6cd5\u4e2d,\u6211\u4eec\u5728insert\u4e4b\u524d\u589e\u52a0\u5176\u4ed6\u65b9\u6cd5,\u8fd9\u91cc\u6b21\u5e8f\u5148\u540e\u662f\u7528\u6237\u7075\u6d3b\u6307\u5b9a\u7684 \u3000\u3000
\n\u3000\u3000public void newMethod()
\n\u3000\u3000{
\n\u3000\u3000\u3000\u3000otherMethod();
\n\u3000\u3000\u3000\u3000work.insert();
\n\u3000\u3000} <\/p>\n

\u3000\u3000public void otherMethod()
\n\u3000\u3000{
\n\u3000\u3000\u3000\u3000ListIterator listIterator = others.listIterator();
\n\u3000\u3000\u3000\u3000while (listIterator.hasNext())
\n\u3000\u3000\u3000\u3000{
\n\u3000\u3000\u3000\u3000\u3000\u3000System.out.println(((String)(listIterator.next())) + " \u6b63\u5728\u8fdb\u884c");
\n\u3000\u3000\u3000\u3000}
\n\u3000\u3000} <\/p>\n

}
\n[\/java]<\/p>\n

\u5728\u4e0a\u4f8b\u4e2d,\u6211\u4eec\u628a\u6316\u5751\u548c\u9489\u6728\u677f\u90fd\u6392\u5728\u4e86\u6253\u6869insert\u524d\u9762,\u8fd9\u91cc\u53ea\u662f\u4e3e\u4f8b\u8bf4\u660e\u989d\u5916\u529f\u80fd\u6b21\u5e8f\u53ef\u4ee5\u4efb\u610f\u5b89\u6392.<\/p>\n

\u597d\u4e86,Decorator\u6a21\u5f0f\u51fa\u6765\u4e86,\u6211\u4eec\u770b\u5982\u4f55\u8c03\u7528:<\/p>\n

[java]Work squarePeg = new SquarePeg();
\nWork decorator = new Decorator(squarePeg);
\ndecorator.insert();
\n[\/java]
\nDecorator\u6a21\u5f0f\u81f3\u6b64\u5b8c\u6210.<\/p>\n

\u5982\u679c\u4f60\u7ec6\u5fc3,\u4f1a\u53d1\u73b0,\u4e0a\u9762\u8c03\u7528\u7c7b\u4f3c\u6211\u4eec\u8bfb\u53d6\u6587\u4ef6\u65f6\u7684\u8c03\u7528:
\n[java]
\nFileReader fr = new FileReader(filename);
\nBufferedReader br = new BufferedReader(fr);[\/java]<\/p>\n

\u5b9e\u9645\u4e0aJava \u7684I\/O API\u5c31\u662f\u4f7f\u7528Decorator\u5b9e\u73b0\u7684,I\/O\u53d8\u79cd\u5f88\u591a,\u5982\u679c\u90fd\u91c7\u53d6\u7ee7\u627f\u65b9\u6cd5,\u5c06\u4f1a\u4ea7\u751f\u5f88\u591a\u5b50\u7c7b,\u663e\u7136\u76f8\u5f53\u7e41\u7410.<\/p>\n

Jive\u4e2d\u7684Decorator\u5b9e\u73b0
\n\u5728\u8bba\u575b\u7cfb\u7edf\u4e2d,\u6709\u4e9b\u7279\u522b\u7684\u5b57\u662f\u4e0d\u80fd\u51fa\u73b0\u5728\u8bba\u575b\u4e2d\u5982”\u6253\u5012XXX”,\u6211\u4eec\u9700\u8981\u8fc7\u6ee4\u8fd9\u4e9b”\u53cd\u52a8”\u7684\u5b57\u4f53.\u4e0d\u8ba9\u4ed6\u4eec\u51fa\u73b0\u6216\u8005\u9ad8\u4eae\u5ea6\u663e\u793a.<\/p>\n

\u5728IBM Java\u4e13\u680f\u4e2d\u4e13\u95e8\u8c08Jive\u7684\u6587\u7ae0\u4e2d,\u6709\u8c08\u53caJive\u4e2dForumMessageFilter.java\u4f7f\u7528\u4e86Decorator\u6a21\u5f0f,\u5176\u5b9e,\u8be5\u7a0b\u5e8f\u5e76\u6ca1\u6709\u771f\u6b63\u4f7f\u7528Decorator,\u800c\u662f\u63d0\u793a\u8bf4:\u9488\u5bf9\u7279\u522b\u8bba\u575b\u53ef\u4ee5\u8bbe\u8ba1\u989d\u5916\u589e\u52a0\u7684\u8fc7\u6ee4\u529f\u80fd,\u90a3\u4e48\u5c31\u53ef\u4ee5\u91cd\u7ec4ForumMessageFilter\u4f5c\u4e3aDecorator\u6a21\u5f0f\u4e86.<\/p>\n

\u6240\u4ee5,\u6211\u4eec\u5728\u5206\u8fa8\u662f\u5426\u771f\u6b63\u662fDecorator\u6a21\u5f0f,\u4ee5\u53ca\u4f1a\u771f\u6b63\u4f7f\u7528Decorator\u6a21\u5f0f,\u4e00\u5b9a\u8981\u628a\u63e1\u597dDecorator\u6a21\u5f0f\u7684\u5b9a\u4e49,\u4ee5\u53ca\u5176\u4e2d\u53c2\u4e0e\u7684\u89d2\u8272(Decoratee \u548cDecorator).<\/p>\n","protected":false},"excerpt":{"rendered":"

\u88c5\u9970\u6a21\u5f0f:Decorator\u5e38\u88ab\u7ffb\u8bd1\u6210”\u88c5\u9970”,\u6211\u89c9\u5f97\u7ffb\u8bd1\u6210”\u6cb9\u6f06\u5de5&#8 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[58],"tags":[],"_links":{"self":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/602"}],"collection":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=602"}],"version-history":[{"count":2,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/602\/revisions"}],"predecessor-version":[{"id":604,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/602\/revisions\/604"}],"wp:attachment":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=602"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=602"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=602"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}