![\"factory\"](\"https:\/\/ai.zhousir.top\/wp-content\/uploads\/2015\/05\/factory.jpg\")
<\/p>\n\u4e3a\u4ec0\u4e48\u5de5\u5382\u6a21\u5f0f\u662f\u5982\u6b64\u5e38\u7528\uff1f\u56e0\u4e3a\u5de5\u5382\u6a21\u5f0f\u5c31\u76f8\u5f53\u4e8e\u521b\u5efa\u5b9e\u4f8b\u5bf9\u8c61\u7684new\uff0c\u6211\u4eec\u7ecf\u5e38\u8981\u6839\u636e\u7c7bClass\u751f\u6210\u5b9e\u4f8b\u5bf9\u8c61\uff0c\u5982A a=new A() \u5de5\u5382\u6a21\u5f0f\u4e5f\u662f\u7528\u6765\u521b\u5efa\u5b9e\u4f8b\u5bf9\u8c61\u7684\uff0c\u6240\u4ee5\u4ee5\u540enew\u65f6\u5c31\u8981\u591a\u4e2a\u5fc3\u773c\uff0c\u662f\u5426\u53ef\u4ee5\u8003\u8651\u5b9e\u7528\u5de5\u5382\u6a21\u5f0f\uff0c\u867d\u7136\u8fd9\u6837\u505a\uff0c\u53ef\u80fd\u591a\u505a\u4e00\u4e9b\u5de5\u4f5c\uff0c\u4f46\u4f1a\u7ed9\u4f60\u7cfb\u7edf\u5e26\u6765\u66f4\u5927\u7684\u53ef\u6269\u5c55\u6027\u548c\u5c3d\u91cf\u5c11\u7684\u4fee\u6539\u91cf\u3002
\n<\/p>\n
\u6211\u4eec\u4ee5\u7c7bSample\u4e3a\u4f8b\uff0c \u5982\u679c\u6211\u4eec\u8981\u521b\u5efaSample\u7684\u5b9e\u4f8b\u5bf9\u8c61:<\/p>\n
Sample sample=new Sample();<\/p>\n
\u53ef\u662f\uff0c\u5b9e\u9645\u60c5\u51b5\u662f\uff0c\u901a\u5e38\u6211\u4eec\u90fd\u8981\u5728\u521b\u5efasample\u5b9e\u4f8b\u65f6\u505a\u70b9\u521d\u59cb\u5316\u7684\u5de5\u4f5c,\u6bd4\u5982\u8d4b\u503c \u67e5\u8be2\u6570\u636e\u5e93\u7b49\u3002<\/p>\n
\u9996\u5148\uff0c\u6211\u4eec\u60f3\u5230\u7684\u662f\uff0c\u53ef\u4ee5\u4f7f\u7528Sample\u7684\u6784\u9020\u51fd\u6570\uff0c\u8fd9\u6837\u751f\u6210\u5b9e\u4f8b\u5c31\u5199\u6210:<\/p>\n
Sample sample=new Sample(\u53c2\u6570);<\/p>\n
\u4f46\u662f\uff0c\u5982\u679c\u521b\u5efasample\u5b9e\u4f8b\u65f6\u6240\u505a\u7684\u521d\u59cb\u5316\u5de5\u4f5c\u4e0d\u662f\u8c61\u8d4b\u503c\u8fd9\u6837\u7b80\u5355\u7684\u4e8b\uff0c\u53ef\u80fd\u662f\u5f88\u957f\u4e00\u6bb5\u4ee3\u7801\uff0c\u5982\u679c\u4e5f\u5199\u5165\u6784\u9020\u51fd\u6570\u4e2d\uff0c\u90a3\u4f60\u7684\u4ee3\u7801\u5f88\u96be\u770b\u4e86\uff08\u5c31\u9700\u8981Refactor\u91cd\u6574\uff09\u3002<\/p>\n
\u4e3a\u4ec0\u4e48\u8bf4\u4ee3\u7801\u5f88\u96be\u770b\uff0c\u521d\u5b66\u8005\u53ef\u80fd\u6ca1\u6709\u8fd9\u79cd\u611f\u89c9\uff0c\u6211\u4eec\u5206\u6790\u5982\u4e0b\uff0c\u521d\u59cb\u5316\u5de5\u4f5c\u5982\u679c\u662f\u5f88\u957f\u4e00\u6bb5\u4ee3\u7801\uff0c\u8bf4\u660e\u8981\u505a\u7684\u5de5\u4f5c\u5f88\u591a\uff0c\u5c06\u5f88\u591a\u5de5\u4f5c\u88c5\u5165\u4e00\u4e2a\u65b9\u6cd5\u4e2d\uff0c\u76f8\u5f53\u4e8e\u5c06\u5f88\u591a\u9e21\u86cb\u653e\u5728\u4e00\u4e2a\u7bee\u5b50\u91cc\uff0c\u662f\u5f88\u5371\u9669\u7684\uff0c\u8fd9\u4e5f\u662f\u6709\u80cc\u4e8eJava\u9762\u5411\u5bf9\u8c61\u7684\u539f\u5219\uff0c\u9762\u5411\u5bf9\u8c61\u7684\u5c01\u88c5(Encapsulation)\u548c\u5206\u6d3e(Delegation)\u544a\u8bc9\u6211\u4eec\uff0c\u5c3d\u91cf\u5c06\u957f\u7684\u4ee3\u7801\u5206\u6d3e”\u5207\u5272”\u6210\u6bcf\u6bb5\uff0c\u5c06\u6bcf\u6bb5\u518d”\u5c01\u88c5”\u8d77\u6765(\u51cf\u5c11\u6bb5\u548c\u6bb5\u4e4b\u95f4\u5076\u5408\u8054\u7cfb\u6027)\uff0c\u8fd9\u6837\uff0c\u5c31\u4f1a\u5c06\u98ce\u9669\u5206\u6563\uff0c\u4ee5\u540e\u5982\u679c\u9700\u8981\u4fee\u6539\uff0c\u53ea\u8981\u66f4\u6539\u6bcf\u6bb5\uff0c\u4e0d\u4f1a\u518d\u53d1\u751f\u7275\u4e00\u52a8\u767e\u7684\u4e8b\u60c5\u3002<\/p>\n
\u5728\u672c\u4f8b\u4e2d\uff0c\u9996\u5148\uff0c\u6211\u4eec\u9700\u8981\u5c06\u521b\u5efa\u5b9e\u4f8b\u7684\u5de5\u4f5c\u4e0e\u4f7f\u7528\u5b9e\u4f8b\u7684\u5de5\u4f5c\u5206\u5f00, \u4e5f\u5c31\u662f\u8bf4\uff0c\u8ba9\u521b\u5efa\u5b9e\u4f8b\u6240\u9700\u8981\u7684\u5927\u91cf\u521d\u59cb\u5316\u5de5\u4f5c\u4eceSample\u7684\u6784\u9020\u51fd\u6570\u4e2d\u5206\u79bb\u51fa\u53bb\u3002<\/p>\n
\u8fd9\u65f6\u6211\u4eec\u5c31\u9700\u8981Factory\u5de5\u5382\u6a21\u5f0f\u6765\u751f\u6210\u5bf9\u8c61\u4e86\uff0c\u4e0d\u80fd\u518d\u7528\u4e0a\u9762\u7b80\u5355new Sample(\u53c2\u6570)\u3002\u8fd8\u6709,\u5982\u679cSample\u6709\u4e2a\u7ee7\u627f\u5982MySample, \u6309\u7167\u9762\u5411\u63a5\u53e3\u7f16\u7a0b,\u6211\u4eec\u9700\u8981\u5c06Sample\u62bd\u8c61\u6210\u4e00\u4e2a\u63a5\u53e3.\u73b0\u5728Sample\u662f\u63a5\u53e3,\u6709\u4e24\u4e2a\u5b50\u7c7bMySample \u548cHisSample .\u6211\u4eec\u8981\u5b9e\u4f8b\u5316\u4ed6\u4eec\u65f6,\u5982\u4e0b:<\/p>\n
Sample mysample=new MySample();
\nSample hissample=new HisSample();<\/p>\n
\u968f\u7740\u9879\u76ee\u7684\u6df1\u5165,Sample\u53ef\u80fd\u8fd8\u4f1a”\u751f\u51fa\u5f88\u591a\u513f\u5b50\u51fa\u6765”, \u90a3\u4e48\u6211\u4eec\u8981\u5bf9\u8fd9\u4e9b\u513f\u5b50\u4e00\u4e2a\u4e2a\u5b9e\u4f8b\u5316,\u66f4\u7cdf\u7cd5\u7684\u662f,\u53ef\u80fd\u8fd8\u8981\u5bf9\u4ee5\u524d\u7684\u4ee3\u7801\u8fdb\u884c\u4fee\u6539:\u52a0\u5165\u540e\u6765\u751f\u51fa\u513f\u5b50\u7684\u5b9e\u4f8b.\u8fd9\u5728\u4f20\u7edf\u7a0b\u5e8f\u4e2d\u662f\u65e0\u6cd5\u907f\u514d\u7684.<\/p>\n
\u4f46\u5982\u679c\u4f60\u4e00\u5f00\u59cb\u5c31\u6709\u610f\u8bc6\u4f7f\u7528\u4e86\u5de5\u5382\u6a21\u5f0f,\u8fd9\u4e9b\u9ebb\u70e6\u5c31\u6ca1\u6709\u4e86.<\/p>\n
\u5de5\u5382\u65b9\u6cd5
\n\u4f60\u4f1a\u5efa\u7acb\u4e00\u4e2a\u4e13\u95e8\u751f\u4ea7Sample\u5b9e\u4f8b\u7684\u5de5\u5382:
\n[java]
\npublic class Factory{<\/p>\n
\u3000\u3000public static Sample creator(int which){<\/p>\n
\u3000\u3000\/\/getClass \u4ea7\u751fSample \u4e00\u822c\u53ef\u4f7f\u7528\u52a8\u6001\u7c7b\u88c5\u8f7d\u88c5\u5165\u7c7b\u3002
\n\u3000\u3000if (which==1)
\n\u3000\u3000\u3000\u3000return new SampleA();
\n\u3000\u3000else if (which==2)
\n\u3000\u3000\u3000\u3000return new SampleB();<\/p>\n
\u3000\u3000}<\/p>\n
}
\n[\/java]
\n\u90a3\u4e48\u5728\u4f60\u7684\u7a0b\u5e8f\u4e2d,\u5982\u679c\u8981\u5b9e\u4f8b\u5316Sample\u65f6.\u5c31\u4f7f\u7528<\/p>\n
[java]Sample sampleA=Factory.creator(1);[\/java]<\/p>\n
\u8fd9\u6837,\u5728\u6574\u4e2a\u5c31\u4e0d\u6d89\u53ca\u5230Sample\u7684\u5177\u4f53\u5b50\u7c7b,\u8fbe\u5230\u5c01\u88c5\u6548\u679c,\u4e5f\u5c31\u51cf\u5c11\u9519\u8bef\u4fee\u6539\u7684\u673a\u4f1a,\u8fd9\u4e2a\u539f\u7406\u53ef\u4ee5\u7528\u5f88\u901a\u4fd7\u7684\u8bdd\u6765\u6bd4\u55bb:\u5c31\u662f\u5177\u4f53\u4e8b\u60c5\u505a\u5f97\u8d8a\u591a,\u8d8a\u5bb9\u6613\u8303\u9519\u8bef.\u8fd9\u6bcf\u4e2a\u505a\u8fc7\u5177\u4f53\u5de5\u4f5c\u7684\u4eba\u90fd\u6df1\u6709\u4f53\u4f1a,\u76f8\u53cd,\u5b98\u505a\u5f97\u8d8a\u9ad8,\u8bf4\u51fa\u7684\u8bdd\u8d8a\u62bd\u8c61\u8d8a\u7b3c\u7edf,\u8303\u9519\u8bef\u53ef\u80fd\u6027\u5c31\u8d8a\u5c11.\u597d\u8c61\u6211\u4eec\u4ece\u7f16\u7a0b\u5e8f\u4e2d\u4e5f\u80fd\u609f\u51fa\u4eba\u751f\u9053\u7406?\u5475\u5475.<\/p>\n
\u4f7f\u7528\u5de5\u5382\u65b9\u6cd5 \u8981\u6ce8\u610f\u51e0\u4e2a\u89d2\u8272\uff0c\u9996\u5148\u4f60\u8981\u5b9a\u4e49\u4ea7\u54c1\u63a5\u53e3\uff0c\u5982\u4e0a\u9762\u7684Sample,\u4ea7\u54c1\u63a5\u53e3\u4e0b\u6709Sample\u63a5\u53e3\u7684\u5b9e\u73b0\u7c7b,\u5982SampleA,\u5176\u6b21\u8981\u6709\u4e00\u4e2afactory\u7c7b\uff0c\u7528\u6765\u751f\u6210\u4ea7\u54c1Sample\uff0c\u5982\u4e0b\u56fe\uff0c\u6700\u53f3\u8fb9\u662f\u751f\u4ea7\u7684\u5bf9\u8c61Sample\uff1a<\/p>\n
<\/p>\n
\u5de5\u5382\u65b9\u6cd5\u6a21\u5f0f\u53cd\u5c04\u673a\u5236\u5b9e\u73b0<\/p>\n
[java]package com.scxh.java.factory;
\ninterface Fruit { \/\/\u6c34\u679c\u63a5\u53e3
\n public void eat() \/\/\u5403\u6c34\u679c
\n}
\nclass Apple implements Fruit{ \/\/\u5b9a\u4e49\u82f9\u679c
\n public void eat() {
\n System.out.println("**\u5403\u82f9\u679c\u3002");
\n }
\n}
\nclass Orange implements Fruit{
\n public void eat() {
\n System.out.println("**\u5403\u6a58\u5b50\u3002");
\n }
\n}
\nclass Factory{
\n public static Fruit getInstance(String className){
\n Fruit fruit = null
\n try{
\n fruit = (Fruit) Class.forName(className).newInstance()
\n }catch(Exception e ){
\n e.printStackTrace()
\n }
\n return fruit
\n }
\n}
\npublic class FactoryDemo{
\n public static void main(String args[]){ \/\/\u901a\u8fc7\u5de5\u5382\u7c7b\u53d6\u5f97\u63a5\u53e3\u5b9e\u4f8b\uff0c\u4f20\u5165\u5b8c\u6574\u7684\u5305.\u7c7b\u540d\u79f0
\n Fruit f = Factory.getInstance("com.scxh.java.factorydemo.Apple")
\n if(f!=null){ \/\/\u5224\u65ad\u662f\u5426\u53d6\u5f97\u63a5\u53e3\u5b9e\u4f8b
\n f.eat()
\n }
\n }
\n}
\n[\/java]
\n\u8fdb\u4e00\u6b65\u7a0d\u5fae\u590d\u6742\u4e00\u70b9\uff0c\u5c31\u662f\u5728\u5de5\u5382\u7c7b\u4e0a\u8fdb\u884c\u62d3\u5c55\uff0c\u5de5\u5382\u7c7b\u4e5f\u6709\u7ee7\u627f\u5b83\u7684\u5b9e\u73b0\u7c7bconcreteFactory\u4e86\u3002<\/p>\n
\u62bd\u8c61\u5de5\u5382
\n\u5de5\u5382\u6a21\u5f0f\u4e2d\u6709: \u5de5\u5382\u65b9\u6cd5(Factory Method) \u62bd\u8c61\u5de5\u5382(Abstract Factory).<\/p>\n
\u8fd9\u4e24\u4e2a\u6a21\u5f0f\u533a\u522b\u5728\u4e8e\u9700\u8981\u521b\u5efa\u5bf9\u8c61\u7684\u590d\u6742\u7a0b\u5ea6\u4e0a\u3002\u5982\u679c\u6211\u4eec\u521b\u5efa\u5bf9\u8c61\u7684\u65b9\u6cd5\u53d8\u5f97\u590d\u6742\u4e86,\u5982\u4e0a\u9762\u5de5\u5382\u65b9\u6cd5\u4e2d\u662f\u521b\u5efa\u4e00\u4e2a\u5bf9\u8c61Sample,\u5982\u679c\u6211\u4eec\u8fd8\u6709\u65b0\u7684\u4ea7\u54c1\u63a5\u53e3Sample2.<\/p>\n
\u8fd9\u91cc\u5047\u8bbe\uff1aSample\u6709\u4e24\u4e2aconcrete\u7c7bSampleA\u548cSamleB\uff0c\u800cSample2\u4e5f\u6709\u4e24\u4e2aconcrete\u7c7bSample2A\u548cSampleB2<\/p>\n
\u90a3\u4e48\uff0c\u6211\u4eec\u5c31\u5c06\u4e0a\u4f8b\u4e2dFactory\u53d8\u6210\u62bd\u8c61\u7c7b,\u5c06\u5171\u540c\u90e8\u5206\u5c01\u88c5\u5728\u62bd\u8c61\u7c7b\u4e2d,\u4e0d\u540c\u90e8\u5206\u4f7f\u7528\u5b50\u7c7b\u5b9e\u73b0\uff0c\u4e0b\u9762\u5c31\u662f\u5c06\u4e0a\u4f8b\u4e2d\u7684Factory\u62d3\u5c55\u6210\u62bd\u8c61\u5de5\u5382:<\/p>\n
[java]public abstract class Factory{<\/p>\n
\u3000\u3000public abstract Sample creator();<\/p>\n
\u3000\u3000public abstract Sample2 creator(String name);<\/p>\n
}<\/p>\n
public class SimpleFactory extends Factory{<\/p>\n
\u3000\u3000public Sample creator(){
\n\u3000\u3000\u3000\u3000………
\n\u3000\u3000\u3000\u3000return new SampleA
\n\u3000\u3000}<\/p>\n
\u3000\u3000public Sample2 creator(String name){
\n\u3000\u3000\u3000\u3000………
\n\u3000\u3000\u3000\u3000return new Sample2A
\n\u3000\u3000}<\/p>\n
}<\/p>\n
public class BombFactory extends Factory{<\/p>\n
\u3000\u3000public Sample creator(){
\n\u3000\u3000\u3000\u3000……
\n\u3000\u3000\u3000\u3000return new SampleB
\n\u3000\u3000}<\/p>\n
\u3000\u3000public Sample2 creator(String name){
\n\u3000\u3000\u3000\u3000……
\n\u3000\u3000\u3000\u3000return new Sample2B
\n\u3000\u3000}<\/p>\n
}
\n[\/java]<\/p>\n
\u4ece\u4e0a\u9762\u770b\u5230\u4e24\u4e2a\u5de5\u5382\u5404\u81ea\u751f\u4ea7\u51fa\u4e00\u5957Sample\u548cSample2,\u4e5f\u8bb8\u4f60\u4f1a\u7591\u95ee\uff0c\u4e3a\u4ec0\u4e48\u6211\u4e0d\u53ef\u4ee5\u4f7f\u7528\u4e24\u4e2a\u5de5\u5382\u65b9\u6cd5\u6765\u5206\u522b\u751f\u4ea7Sample\u548cSample2?<\/p>\n
\u62bd\u8c61\u5de5\u5382\u8fd8\u6709\u53e6\u5916\u4e00\u4e2a\u5173\u952e\u8981\u70b9\uff0c\u662f\u56e0\u4e3a SimpleFactory\u5185\uff0c\u751f\u4ea7Sample\u548c\u751f\u4ea7Sample2\u7684\u65b9\u6cd5\u4e4b\u95f4\u6709\u4e00\u5b9a\u8054\u7cfb\uff0c\u6240\u4ee5\u624d\u8981\u5c06\u8fd9\u4e24\u4e2a\u65b9\u6cd5\u6346\u7ed1\u5728\u4e00\u4e2a\u7c7b\u4e2d\uff0c\u8fd9\u4e2a\u5de5\u5382\u7c7b\u6709\u5176\u672c\u8eab\u7279\u5f81\uff0c\u4e5f\u8bb8\u5236\u9020\u8fc7\u7a0b\u662f\u7edf\u4e00\u7684\uff0c\u6bd4\u5982\uff1a\u5236\u9020\u5de5\u827a\u6bd4\u8f83\u7b80\u5355\uff0c\u6240\u4ee5\u540d\u79f0\u53ebSimpleFactory\u3002<\/p>\n
\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u5de5\u5382\u65b9\u6cd5\u7528\u5f97\u6bd4\u8f83\u591a\u4e00\u4e9b\uff0c\u800c\u4e14\u662f\u548c\u52a8\u6001\u7c7b\u88c5\u5165\u5668\u7ec4\u5408\u5728\u4e00\u8d77\u5e94\u7528\u3002
\n\u4e3e\u4f8b<\/p>\n
\u6211\u4eec\u4ee5Jive\u7684ForumFactory\u4e3a\u4f8b\uff0c\u8fd9\u4e2a\u4f8b\u5b50\u5728\u524d\u9762\u7684Singleton\u6a21\u5f0f\u4e2d\u6211\u4eec\u8ba8\u8bba\u8fc7\uff0c\u73b0\u5728\u518d\u8ba8\u8bba\u5176\u5de5\u5382\u6a21\u5f0f:<\/p>\n
[java]public abstract class ForumFactory {<\/p>\n
\u3000\u3000private static Object initLock = new Object();
\n\u3000\u3000private static String className = "com.jivesoftware.forum.database.DbForumFactory";
\n\u3000\u3000private static ForumFactory factory = null;<\/p>\n
\u3000\u3000public static ForumFactory getInstance(Authorization authorization) {
\n\u3000\u3000\u3000\u3000\/\/If no valid authorization passed in, return null.
\n\u3000\u3000\u3000\u3000if (authorization == null) {
\n\u3000\u3000\u3000\u3000\u3000\u3000return null;
\n\u3000\u3000\u3000\u3000}
\n\u3000\u3000\u3000\u3000\/\/\u4ee5\u4e0b\u4f7f\u7528\u4e86Singleton \u5355\u6001\u6a21\u5f0f
\n\u3000\u3000\u3000\u3000if (factory == null) {
\n\u3000\u3000\u3000\u3000\u3000\u3000synchronized(initLock) {
\n\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000if (factory == null) {
\n\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000……<\/p>\n
\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000try {
\n\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\/\/\u52a8\u6001\u8f6c\u8f7d\u7c7b
\n\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000Class c = Class.forName(className);
\n\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000factory = (ForumFactory)c.newInstance();
\n\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000}
\n\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000catch (Exception e) {
\n\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000return null;
\n\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000}
\n\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000}
\n\u3000\u3000\u3000\u3000\u3000\u3000}
\n\u3000\u3000\u3000\u3000}<\/p>\n
\u3000\u3000\u3000\u3000\/\/Now, \u8fd4\u56de proxy.\u7528\u6765\u9650\u5236\u6388\u6743\u5bf9forum\u7684\u8bbf\u95ee
\n\u3000\u3000\u3000\u3000return new ForumFactoryProxy(authorization, factory,
\n\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000factory.getPermissions(authorization));
\n\u3000\u3000}<\/p>\n
\u3000\u3000\/\/\u771f\u6b63\u521b\u5efaforum\u7684\u65b9\u6cd5\u7531\u7ee7\u627fforumfactory\u7684\u5b50\u7c7b\u53bb\u5b8c\u6210.
\n\u3000\u3000public abstract Forum createForum(String name, String description)
\n\u3000\u3000throws UnauthorizedException, ForumAlreadyExistsException;<\/p>\n
\u3000\u3000….<\/p>\n
}<\/p>\n
[\/java]<\/p>\n
\u56e0\u4e3a\u73b0\u5728\u7684Jive\u662f\u901a\u8fc7\u6570\u636e\u5e93\u7cfb\u7edf\u5b58\u653e\u8bba\u575b\u5e16\u5b50\u7b49\u5185\u5bb9\u6570\u636e,\u5982\u679c\u5e0c\u671b\u66f4\u6539\u4e3a\u901a\u8fc7\u6587\u4ef6\u7cfb\u7edf\u5b9e\u73b0,\u8fd9\u4e2a\u5de5\u5382\u65b9\u6cd5ForumFactory\u5c31\u63d0\u4f9b\u4e86\u63d0\u4f9b\u52a8\u6001\u63a5\u53e3:<\/p>\n
private static String className = “com.jivesoftware.forum.database.DbForumFactory”;<\/p>\n
\u4f60\u53ef\u4ee5\u4f7f\u7528\u81ea\u5df1\u5f00\u53d1\u7684\u521b\u5efaforum\u7684\u65b9\u6cd5\u4ee3\u66ffcom.jivesoftware.forum.database.DbForumFactory\u5c31\u53ef\u4ee5.<\/p>\n
\u5728\u4e0a\u9762\u7684\u4e00\u6bb5\u4ee3\u7801\u4e2d\u4e00\u5171\u7528\u4e86\u4e09\u79cd\u6a21\u5f0f,\u9664\u4e86\u5de5\u5382\u6a21\u5f0f\u5916,\u8fd8\u6709Singleton\u5355\u6001\u6a21\u5f0f,\u4ee5\u53caproxy\u6a21\u5f0f,proxy\u6a21\u5f0f\u4e3b\u8981\u7528\u6765\u6388\u6743\u7528\u6237\u5bf9forum\u7684\u8bbf\u95ee,\u56e0\u4e3a\u8bbf\u95eeforum\u6709\u4e24\u79cd\u4eba:\u4e00\u4e2a\u662f\u6ce8\u518c\u7528\u6237 \u4e00\u4e2a\u662f\u6e38\u5ba2guest,\u90a3\u4e48\u90a3\u4e48\u76f8\u5e94\u7684\u6743\u9650\u5c31\u4e0d\u4e00\u6837,\u800c\u4e14\u8fd9\u4e2a\u6743\u9650\u662f\u8d2f\u7a7f\u6574\u4e2a\u7cfb\u7edf\u7684,\u56e0\u6b64\u5efa\u7acb\u4e00\u4e2aproxy,\u7c7b\u4f3c\u7f51\u5173\u7684\u6982\u5ff5,\u53ef\u4ee5\u5f88\u597d\u7684\u8fbe\u5230\u8fd9\u4e2a\u6548\u679c. <\/p>\n
\u770b\u770bJava\u5ba0\u7269\u5e97\u4e2d\u7684CatalogDAOFactory:<\/p>\n
[java]public class CatalogDAOFactory {
\n\u3000\u3000\/**<\/p>\n
\u3000\u3000* \u672c\u65b9\u6cd5\u5236\u5b9a\u4e00\u4e2a\u7279\u522b\u7684\u5b50\u7c7b\u6765\u5b9e\u73b0DAO\u6a21\u5f0f\u3002
\n\u3000\u3000* \u5177\u4f53\u5b50\u7c7b\u5b9a\u4e49\u662f\u5728J2EE\u7684\u90e8\u7f72\u63cf\u8ff0\u5668\u4e2d\u3002
\n\u3000\u3000*\/<\/p>\n
\u3000\u3000public static CatalogDAO getDAO() throws CatalogDAOSysException {<\/p>\n
\u3000\u3000\u3000\u3000CatalogDAO catDao = null;<\/p>\n
\u3000\u3000\u3000\u3000try {<\/p>\n
\u3000\u3000\u3000\u3000\u3000\u3000InitialContext ic = new InitialContext();
\n\u3000\u3000\u3000\u3000\u3000\u3000\/\/\u52a8\u6001\u88c5\u5165CATALOG_DAO_CLASS
\n\u3000\u3000\u3000\u3000\u3000\u3000\/\/\u53ef\u4ee5\u5b9a\u4e49\u81ea\u5df1\u7684CATALOG_DAO_CLASS\uff0c\u4ece\u800c\u5728\u65e0\u9700\u53d8\u66f4\u592a\u591a\u4ee3\u7801
\n\u3000\u3000\u3000\u3000\u3000\u3000\/\/\u7684\u524d\u63d0\u4e0b\uff0c\u5b8c\u6210\u7cfb\u7edf\u7684\u5de8\u5927\u53d8\u66f4\u3002<\/p>\n
\u3000\u3000\u3000\u3000\u3000\u3000String className =(String) ic.lookup(JNDINames.CATALOG_DAO_CLASS);<\/p>\n
\u3000\u3000\u3000\u3000\u3000\u3000catDao = (CatalogDAO) Class.forName(className).newInstance();<\/p>\n
\u3000\u3000\u3000\u3000} catch (NamingException ne) {<\/p>\n
\u3000\u3000\u3000\u3000\u3000\u3000throw new CatalogDAOSysException("
\n\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000CatalogDAOFactory.getDAO: NamingException while
\n\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000getting DAO type : \\n" + ne.getMessage());<\/p>\n
\u3000\u3000\u3000\u3000} catch (Exception se) {<\/p>\n
\u3000\u3000\u3000\u3000\u3000\u3000throw new CatalogDAOSysException("
\n\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000CatalogDAOFactory.getDAO: Exception while getting
\n\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000DAO type : \\n" + se.getMessage());<\/p>\n
\u3000\u3000\u3000\u3000}<\/p>\n
\u3000\u3000\u3000\u3000return catDao;<\/p>\n
\u3000\u3000}<\/p>\n
}[\/java]
\nCatalogDAOFactory\u662f\u5178\u578b\u7684\u5de5\u5382\u65b9\u6cd5\uff0ccatDao\u662f\u901a\u8fc7\u52a8\u6001\u7c7b\u88c5\u5165\u5668className\u83b7\u5f97CatalogDAOFactory\u5177\u4f53\u5b9e\u73b0\u5b50\u7c7b\uff0c\u8fd9\u4e2a\u5b9e\u73b0\u5b50\u7c7b\u5728Java\u5ba0\u7269\u5e97\u662f\u7528\u6765\u64cd\u4f5ccatalog\u6570\u636e\u5e93\uff0c\u7528\u6237\u53ef\u4ee5\u6839\u636e\u6570\u636e\u5e93\u7684\u7c7b\u578b\u4e0d\u540c\uff0c\u5b9a\u5236\u81ea\u5df1\u7684\u5177\u4f53\u5b9e\u73b0\u5b50\u7c7b\uff0c\u5c06\u81ea\u5df1\u7684\u5b50\u7c7b\u540d\u7ed9\u4e0eCATALOG_DAO_CLASS\u53d8\u91cf\u5c31\u53ef\u4ee5\u3002<\/p>\n
\u7531\u6b64\u53ef\u89c1\uff0c\u5de5\u5382\u65b9\u6cd5\u786e\u5b9e\u4e3a\u7cfb\u7edf\u7ed3\u6784\u63d0\u4f9b\u4e86\u975e\u5e38\u7075\u6d3b\u5f3a\u5927\u7684\u52a8\u6001\u6269\u5c55\u673a\u5236\uff0c\u53ea\u8981\u6211\u4eec\u66f4\u6362\u4e00\u4e0b\u5177\u4f53\u7684\u5de5\u5382\u65b9\u6cd5\uff0c\u7cfb\u7edf\u5176\u4ed6\u5730\u65b9\u65e0\u9700\u4e00\u70b9\u53d8\u6362\uff0c\u5c31\u6709\u53ef\u80fd\u5c06\u7cfb\u7edf\u529f\u80fd\u8fdb\u884c\u6539\u5934\u6362\u9762\u7684\u53d8\u5316\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e3a\u4ec0\u4e48\u5de5\u5382\u6a21\u5f0f\u662f\u5982\u6b64\u5e38\u7528\uff1f\u56e0\u4e3a\u5de5\u5382\u6a21\u5f0f\u5c31\u76f8\u5f53\u4e8e\u521b\u5efa\u5b9e\u4f8b\u5bf9\u8c61\u7684new\uff0c\u6211\u4eec\u7ecf\u5e38\u8981\u6839\u636e\u7c7bClass\u751f\u6210\u5b9e\u4f8b\u5bf9\u8c61\uff0c\u5982 […]<\/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\/641"}],"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=641"}],"version-history":[{"count":4,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/641\/revisions"}],"predecessor-version":[{"id":646,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/641\/revisions\/646"}],"wp:attachment":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=641"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=641"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=641"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}