{"id":3051,"date":"2018-09-11T12:35:16","date_gmt":"2018-09-11T04:35:16","guid":{"rendered":"http:\/\/www.xttblog.com\/?p=3051"},"modified":"2018-09-11T12:35:16","modified_gmt":"2018-09-11T04:35:16","slug":"%e5%8f%8c%e4%ba%b2%e5%a7%94%e6%b4%be%e4%b8%80%e8%af%8d%e7%9a%84%e7%94%b1%e6%9d%a5","status":"publish","type":"post","link":"https:\/\/www.xttblog.com\/?p=3051","title":{"rendered":"\u201c\u53cc\u4eb2\u59d4\u6d3e\u201d\u4e00\u8bcd\u7684\u7531\u6765"},"content":{"rendered":"

\n\t\u6211\u4eec\u90fd\u77e5\u9053 java \u865a\u62df\u673a\u4e2d\u6709\u4e00\u4e2a\u7528\u6765\u63cf\u8ff0\u7c7b\u52a0\u8f7d\u673a\u5236\u7684\u8bcd\u53eb“\u53cc\u4eb2\u59d4\u6d3e”\uff0c\u4f46\u662f\u8fd9\u4e2a\u8bcd\u662f\u7531\u4f55\u800c\u6765\uff0c\u4e3a\u4ec0\u4e48\u53eb\u53cc\u4eb2\u59d4\u6d3e\u5462\uff1f\u53cc\u4eb2\u59d4\u6d3e\u4ee3\u8868\u6709\u4ec0\u4e48\u610f\u4e49\u5462\uff1f\u5e26\u7740\u8fd9\u6837\u7684\u7591\u95ee\uff0c\u6211\u95ee\u8fc7\u5f88\u591a\u9762\u8bd5\u7684\u90fd\u4e0d\u662f\u5f88\u6e05\u695a\uff0c\u800c\u4e14\u516c\u53f8\u4e2d\u5f88\u591a\u5de5\u4f5c\u4e86\u5f88\u591a\u5e74\u7684\u8001\u53f8\u673a\u4e5f\u8bb2\u4e0d\u6e05\u695a\u3002\u4e8e\u662f\u6211\u67e5\u4e86\u5f88\u591a\u8d44\u6599\uff0c\u90fd\u6ca1\u6709\u660e\u786e\u7684\u8bf4\u660e\u4e3a\u4ec0\u4e48\u53eb\u53cc\u4eb2\u59d4\u6d3e\uff0c\u4f46\u662f\u5927\u591a\u90fd\u6697\u793a\u662f\u7ffb\u8bd1\u95ee\u9898\u3002\u4f46\u662f\u672c\u6587\u4f5c\u8005\u5374\u8ba4\u4e3a\u5b83\u53e6\u6709\u6df1\u610f\uff0c\u5177\u4f53\u8bf7\u770b\u672c\u6587\u7ed9\u4f60\u4e00\u4e00\u9053\u6765\u3002\n<\/p>\n

\n\t\u7c7b\u4f3c\u7684\u8bf4\u7ffb\u8bd1\u95ee\u9898\uff0c\u8fd8\u6709 socket\uff0c\u4e2d\u6587\u610f\u601d\u53eb”\u5957\u63a5\u5b57“\uff0c\u5b9e\u9645\u82f1\u6587\u4e2d\u4ee3\u8868\u7684\u662f\u63d2\u5ea7\u7684\u610f\u601d\u3002\u5176\u4ed6\u7684\u8fd8\u6709\u5f88\u591a\uff0c\u6211\u5c31\u4e0d\u5728\u5217\u4e3e\u4e86\u3002\n<\/p>\n

\n\t\u73b0\u5728\u6211\u95ee\u4f60“\u53cc\u4eb2\u59d4\u6d3e\u673a\u5236”\uff08parent delegation\uff09\u4e00\u8bcd\u4e2d\u53cc\u4eb2\u662f\u54ea\u4e24\u4e2a\uff1fjava \u4e2d\u660e\u660e\u662f\u5355\u7ee7\u627f\u5417\uff0c\u660e\u660e\u662f“\u5355\u4eb2\u59d4\u6d3e”\uff0c\u6216\u8005\u53eb\uff08\u7236\u7c7b\uff09\u59d4\u6d3e\u6a21\u578b\u4e5f\u597d\u54c8\u3002\n<\/p>\n

\n\t\"\u53cc\u4eb2\u59d4\u6d3e\u6a21\u578b\"\n<\/p>\n

\n\t\u4f60\u80fd\u591f\u4ece\u4e0a\u56fe\u4e2d\u770b\u51fa\u53cc\u4eb2\u662f\u600e\u4e48\u6765\u7684\u5417\uff1f\u5f88\u660e\u663e\u7ffb\u8bd1\u6210\u53cc\u4eb2\u59d4\u6d3e\u4e0d\u5408\u9002\uff0c\u8fd8\u4e0d\u5982\u53eb“\u5355\u4eb2\u59d4\u6d3e”\uff0c\u6216\u8005“\u7236\u7c7b\u59d4\u6d3e\u6a21\u578b”\u3002\n<\/p>\n

\n\t\u4e0b\u9762\u6211\u4eec\u518d\u770b\u770b Java \u7c7b\u52a0\u8f7d\u7684\u59d4\u6d3e\u6a21\u578b\u56fe\uff1a\n<\/p>\n

\n\t\"java\n<\/p>\n

\n\t\u57fa\u672c\u673a\u5236\u5c31\u662f\uff1a\n<\/p>\n

\n\t\u5982\u679c\u4e00\u4e2a\u7c7b\u52a0\u8f7d\u5668\u6536\u5230\u4e86\u7c7b\u52a0\u8f7d\u7684\u8bf7\u6c42\uff0c\u5b83\u9996\u5148\u4e0d\u4f1a\u81ea\u5df1\u53bb\u5c1d\u8bd5\u52a0\u8f7d\u8fd9\u4e2a\u7c7b\uff0c\u800c\u662f\u628a\u8bf7\u6c42\u59d4\u6258\u7ed9\u7236\u52a0\u8f7d\u5668\u53bb\u5b8c\u6210\uff0c\u4f9d\u6b21\u5411\u4e0a\uff0c\u56e0\u6b64\uff0c\u6240\u6709\u7684\u7c7b\u52a0\u8f7d\u8bf7\u6c42\u6700\u7ec8\u90fd\u5e94\u8be5\u88ab\u4f20\u9012\u5230\u9876\u5c42\u7684\u542f\u52a8\u7c7b\u52a0\u8f7d\u5668\u4e2d\uff0c\u53ea\u6709\u5f53\u7236\u52a0\u8f7d\u5668\u5728\u5b83\u7684\u641c\u7d22\u8303\u56f4\u4e2d\u6ca1\u6709\u627e\u5230\u6240\u9700\u7684\u7c7b\u65f6\uff0c\u5373\u65e0\u6cd5\u5b8c\u6210\u8be5\u52a0\u8f7d\uff0c\u5b50\u52a0\u8f7d\u5668\u624d\u4f1a\u5c1d\u8bd5\u81ea\u5df1\u53bb\u52a0\u8f7d\u8be5\u7c7b\u3002<\/strong><\/span>\n<\/p>\n

\n\t\u901a\u8fc7\u4e0a\u9762\u7684\u8fd9\u6bb5\u8bdd\u548c Java \u7c7b\u52a0\u8f7d\u7684\u59d4\u6d3e\u6a21\u578b\u56fe\uff0c\u6839\u672c\u65e0\u6cd5\u60f3\u8c61\u4e3a\u4ec0\u4e48\u53eb\u53cc\u4eb2 \uff0c\u660e\u660e\u90fd\u53ea\u6709\u4e00\u4e2aparent\uff0c\u8981\u53eb\u4e5f\u53eb\u5355\u4eb2\u554a\u3002\n<\/p>\n

\n\t\u53ea\u6709\u4e0a\u9762\u8fd9\u4e00\u4e2a\u89e3\u91ca\u662f\u6bd4\u8f83\u5408\u7406\u7684\u3002\u5269\u4e0b\u7684\uff0c\u6211\u4eec\u53bb\u67e5\u627e IBM \u7684\u77e5\u8bc6\u4e2d\u5fc3\uff1a\n<\/p>\n

\n\t\"The\n<\/p>\n

\n\t\u53d1\u73b0IBM\u7684\u77e5\u8bc6\u4e2d\u5fc3\u53eb\u8fd9\u79cd\u673a\u5236\u53eb\uff1aparent-delegation model\u3002\n<\/p>\n

\n\t\u8fd9\u4e2a\u663e\u7136\u65e0\u6cd5\u7ffb\u8bd1\u6210“\u53cc\u4eb2”\u554a\uff0c\u5373\u4f7f\u7ffb\u8bd1\u4e5f\u5e94\u8be5\u662f “\u7236\u59d4\u6258\u6a21\u578b” \u6216 “\u7236\u59d4\u6d3e\u6a21\u578b”\u3002\n<\/p>\n

\n\t\u800c\u4e0d\u5e94\u8be5\u53eb \u53cc\u4eb2 \uff0c\u629b\u5f00“\u53cc”\uff0c “\u4eb2”\u5b57\u4e5f\u65e0\u6cd5\u76f4\u63a5\u4f53\u73b0parent\u7684\u610f\u601d\u554a\uff0c\u51b5\u4e14“\u7236”\u5728\u7f16\u7a0b\u754c\u4e5f\u7b97\u662f\u4e00\u4e2a\u5e38\u7528\u7684\u8bcd\u4e86\uff0c\u4ec0\u4e48“\u7236\u8282\u70b9”\u4e4b\u7c7b\u7684\u3002\n<\/p>\n

\n\t\u518d\u53bb\u67e5\u8c37\u6b4c\uff0c\u53d1\u73b0\u5982\u4e0b\uff1a\n<\/p>\n

\n\t\"\u53cc\u4eb2\u59d4\u6d3e\u6a21\u578b\"\n<\/p>\n

\n\t\u90fd\u662f Parent Delegation Model \u554a\u3002\u8fd9\u4e2a\u771f\u7684\u65e0\u6cd5\u53eb\u53cc\u4eb2\u554a\uff0cmake no sense\u554a\u3002\u8fd8\u4e0d\u5982\u53eb“\u5543\u8001\u6a21\u578b”\uff0c\u5982\u679c\u8981\u6b63\u5f0f\u4e00\u70b9\uff0c\u90a3\u5efa\u8bae\u662f\uff1a“\u7236\u59d4\u6258\u6a21\u578b”\u6216“\u7236\u59d4\u6d3e\u6a21\u578b”\u3002\n<\/p>\n

\n\t“\u53cc\u4eb2\u59d4\u6d3e”\u8fd9\u4e2a\u8bcd\u4f30\u8ba1\u4e5f\u5c31\u662f\u7ffb\u8bd1\u9519\u8bef\u7684\u95ee\u9898\uff0c\u6216\u8005\u662f\u8fd9\u6837\u4e00\u79cd\u53ef\u80fd\u6027\u3002\u76f8\u5bf9\u4e8e AppClassLoader\uff0c\u5373\u5e94\u7528\u7a0b\u5e8f\u7c7b\u52a0\u8f7d\u5668\u3002\u5b83\u52a0\u8f7d\u6211\u4eec\u9879\u76ee\uff08\u5de5\u7a0b\uff09\u4e0b\u7684 CLASSPATH \u8def\u5f84\u4e0b\u7684\u7c7b\uff0c\u5b83\u4f1a\u59d4\u6258 ExtClassLoader \u6807\u51c6\u6269\u5c55\uff08Extension\uff09\u7c7b\u52a0\u8f7d\u5668\uff08\u4e5f\u6709\u79f0\u4f5c\u6269\u5c55\u7c7b\u52a0\u8f7d\u5668\uff09\uff0c\u8fd9\u65f6 ExtClassLoader \u4f1a\u518d\u6b21\u59d4\u6d3e BootstrapClassLoader \u542f\u52a8\u7c7b\u52a0\u8f7d\u5668\u3002BootstrapClassLoader \u662f Java \u865a\u62df\u673a\u7684\u7b2c\u4e00\u4e2a\u7c7b\u52a0\u8f7d\u5668\uff0c\u5b83\u4e0d\u80fd\u518d\u5411\u4e0a\u59d4\u6258\u4e86\u3002\u56e0\u6b64\uff0c\u6839\u636e\u8fd9\u4e2a\u8fc7\u7a0b\uff0c\u6211\u4eec\u53d1\u73b0\u4e00\u5171\u59d4\u6258\u4e86\u4e24\u6b21\uff0c\u6240\u4ee5“\u53cc\u4eb2\u59d4\u6d3e”\u4e2d\u6709\u4e00\u4e2a\u53cc\u3002\u800c“\u4eb2”\u5b57\uff0c\u5728\u4e2d\u56fd\u4ee3\u8868\u7684\u662f\u4eb2\u4eba\u7684\u610f\u601d\uff0c\u800c\u59d4\u6258\u4e24\u6b21\uff0c\u90fd\u662f\u4ea4\u7ed9\u7236\u7c7b\u6765\u5904\u7406\uff0c\u56e0\u6b64\u90fd\u7b97\u5f97\u4e0a\u53eb\u4eb2\u4eba\u3002\u6240\u4ee5“\u53cc\u4eb2\u59d4\u6d3e”\u4e2d\u7684\u53cc\u4eb2\u5e94\u8be5\u5c31\u662f\u8fd9\u6837\u6765\u7684\u3002<\/strong>\u5982\u679c\u4f60\u8fd8\u6709\u4e0d\u540c\u7684\u89c2\u70b9\uff0c\u8bb0\u5f97\u7559\u8a00\u8ba8\u8bba\u54e6\uff01<\/p>\n

\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/<\/p>

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\u672c\u6587\u539f\u6587\u51fa\u5904\uff1a\u4e1a\u4f59\u8349<\/a>\uff1a » \u201c\u53cc\u4eb2\u59d4\u6d3e\u201d\u4e00\u8bcd\u7684\u7531\u6765<\/a><\/p>","protected":false},"excerpt":{"rendered":"

\u6211\u4eec\u90fd\u77e5\u9053 java \u865a\u62df\u673a\u4e2d\u6709\u4e00\u4e2a\u7528\u6765\u63cf\u8ff0\u7c7b\u52a0\u8f7d\u673a\u5236\u7684\u8bcd\u53eb“\u53cc\u4eb2\u59d4\u6d3e”\uff0c\u4f46\u662f\u8fd9\u4e2a\u8bcd\u662f […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5,6],"tags":[1680,1679,1678,731,1647],"class_list":["post-3051","post","type-post","status-publish","format-standard","hentry","category-java","category-yyzt","tag-appclassloader","tag-bootstrapclassloader","tag-extclassloader","tag-jvm"],"_links":{"self":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/3051","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3051"}],"version-history":[{"count":1,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/3051\/revisions"}],"predecessor-version":[{"id":3052,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/3051\/revisions\/3052"}],"wp:attachment":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3051"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3051"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3051"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}