{"id":1103,"date":"2020-07-15T13:38:21","date_gmt":"2020-07-15T05:38:21","guid":{"rendered":"https:\/\/www.zeroheart.xyz\/wordpress\/?p=1103"},"modified":"2020-07-15T13:38:21","modified_gmt":"2020-07-15T05:38:21","slug":"spring%e7%9a%84%e5%be%aa%e7%8e%af%e4%be%9d%e8%b5%96%e5%92%8c%e5%a4%84%e7%90%86","status":"publish","type":"post","link":"https:\/\/www.zeroheart.xyz\/wordpress\/?p=1103","title":{"rendered":"Spring\u7684\u5faa\u73af\u4f9d\u8d56\u548c\u5904\u7406"},"content":{"rendered":"\n<p>\u5148\u8bf4\u7ed3\u8bba\uff1a\u6784\u9020\u5668\u548c\u539f\u578b\u5faa\u73af\u4f9d\u8d56\uff0c\u65e0\u6cd5\u5904\u7406 \uff0csetter\u6ce8\u5165\u548c\u5355\u4f8b@Autowired\u6ce8\u5165\u53ef\u4ee5\u5904\u7406\u3002<\/p>\n\n\n\n<p>\u539f\u56e0\uff1a\u89e3\u51b3\u5faa\u73af\u4f9d\u8d56\uff0c\u4f7f\u7528\u7684\u662fbean\u7684\u4e2d\u95f4\u6001\uff0c\u9700\u8981\u5728\u5b9e\u4f8b\u5316\uff08\u6784\u9020\u5668\u6267\u884c\u4e4b\u540e\uff09\u624d\u80fd\u62ff\u5230\u8fd9\u4e2a\u4e2d\u95f4\u5bf9\u8c61\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"852\" height=\"442\" src=\"https:\/\/www.zeroheart.xyz\/wordpress\/wp-content\/uploads\/2020\/07\/image-3.png\" alt=\"\" class=\"wp-image-1108\" srcset=\"https:\/\/www.zeroheart.xyz\/wordpress\/wp-content\/uploads\/2020\/07\/image-3.png 852w, https:\/\/www.zeroheart.xyz\/wordpress\/wp-content\/uploads\/2020\/07\/image-3-300x156.png 300w, https:\/\/www.zeroheart.xyz\/wordpress\/wp-content\/uploads\/2020\/07\/image-3-768x398.png 768w\" sizes=\"(max-width: 852px) 100vw, 852px\" \/><figcaption><br><\/figcaption><\/figure>\n\n\n\n<p>\u521b\u5efa\u4e00\u4e2abean\uff0cdoCreateBean\u65b9\u6cd5\uff0c\u5206\u4e3acreateBeanInstance\uff0cpopulateBean\u548c initalizeBrann\uff0c\u5355\u4f8b\u548c\u5c5e\u6027\u6ce8\u5165\u7684\u5faa\u73af\u4f9d\u8d56\u51fa\u73b0\u5728populateBean\uff0c\u662f\u53ef\u4ee5\u5904\u7406\u7684\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">\u4e09\u7ea7\u7f13\u5b58<br><br>private\u00a0final Map&lt;String, Object> singletonObjects =\u00a0new ConcurrentHashMap&lt;>(256);\u00a0\/\/\u4e00\u7ea7\u7f13\u5b58<br>\u00a0<br>private\u00a0final Map&lt;String, Object> earlySingletonObjects =\u00a0new HashMap&lt;>(16);\u00a0\/\/ \u4e8c\u7ea7\u7f13\u5b58<br>\u00a0<br>private\u00a0final Map&lt;String, ObjectFactory&lt;?>> singletonFactories =\u00a0new HashMap&lt;>(16);\u00a0\/\/ \u4e09\u7ea7\u7f13\u5b58<br><br>\/\/\u6b63\u5728\u521b\u5efa\u7684bean\uff0c\u521b\u5efa\u5b8c\u6210\u65f6\u4f1a\u5c06\u5176\u79fb\u51fa<br>private\u00a0final Set&lt;String> singletonsCurrentlyInCreation = Collections.newSetFromMap(new ConcurrentHashMap&lt;>(16));<br><br>\u5148\u4ece\u4e00\u7ea7\u7f13\u5b58singletonObjects\u4e2d\u53bb\u83b7\u53d6\u3002\uff08\u5982\u679c\u83b7\u53d6\u5230\u5c31\u76f4\u63a5return\uff09<br><br>\u5982\u679c\u83b7\u53d6\u4e0d\u5230\u6216\u8005\u5bf9\u8c61\u6b63\u5728\u521b\u5efa\u4e2d\uff08isSingletonCurrentlyInCreation()\uff09\uff0c\u90a3\u5c31\u518d\u4ece\u4e8c\u7ea7\u7f13\u5b58earlySingletonObjects\u4e2d\u83b7\u53d6\u3002\uff08\u5982\u679c\u83b7\u53d6\u5230\u5c31\u76f4\u63a5return\uff09<br><br>\u5982\u679c\u8fd8\u662f\u83b7\u53d6\u4e0d\u5230\uff0c\u4e14\u5141\u8bb8singletonFactories\uff08allowEarlyReference=true\uff09\u901a\u8fc7getObject()\u83b7\u53d6\u3002\u5c31\u4ece\u4e09\u7ea7\u7f13\u5b58singletonFactory.getObject()\u83b7\u53d6\u3002\uff08\u5982\u679c\u83b7\u53d6\u5230\u4e86\u5c31\u4ecesingletonFactories\u4e2d\u79fb\u9664\uff0c\u5e76\u4e14\u653e\u8fdbearlySingletonObjects\u3002\u5176\u5b9e\u4e5f\u5c31\u662f\u4ece\u4e09\u7ea7\u7f13\u5b58\u79fb\u52a8\uff08\u662f\u526a\u5207\u3001\u4e0d\u662f\u590d\u5236\u54e6~\uff09\u5230\u4e86\u4e8c\u7ea7\u7f13\u5b58\uff09<br><br>\u52a0\u5165<code>singletonFactories<\/code>\u4e09\u7ea7\u7f13\u5b58\u7684\u524d\u63d0\u662f\u6267\u884c\u4e86\u6784\u9020\u5668\u5c31\u662f\u5728createBeanInstance\u65b9\u6cd5\u4e4b\u540e\u6267\u884c\uff0c\u6240\u4ee5\u6784\u9020\u5668\u7684\u5faa\u73af\u4f9d\u8d56\u6ca1\u6cd5\u89e3\u51b3<br><br>\u5982\u679c\u4e09\u7ea7\u7f13\u5b58\u83b7\u53d6\u4e0d\u5230\uff0c\u90a3\u5c31\u521b\u5efa\uff0c\u7136\u540e\u8fdb\u5165singletonFactories\uff0c\u8fdb\u5165earlySingletonObjects\uff0c\u8fdb\u5165singletonObjects\uff0c\u5f97\u5230bean\u3002<\/pre>\n\n\n\n<p><\/p>\n\n\n\n<p>\u53c2\u8003\uff1a <a href=\"https:\/\/www.cnblogs.com\/longy2012\/articles\/12834762.html\">https:\/\/www.cnblogs.com\/longy2012\/articles\/12834762.html<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5148\u8bf4\u7ed3\u8bba\uff1a\u6784\u9020\u5668\u548c\u539f\u578b\u5faa\u73af\u4f9d\u8d56\uff0c\u65e0\u6cd5\u5904\u7406 \uff0csetter\u6ce8\u5165\u548c\u5355\u4f8b@Autowired\u6ce8\u5165\u53ef\u4ee5\u5904\u7406\u3002 \u539f\u56e0\uff1a\u89e3 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