{"id":10008114,"date":"2023-08-18T13:01:28","date_gmt":"2023-08-18T05:01:28","guid":{"rendered":"https:\/\/blog.itmax.cn\/?p=10008114"},"modified":"2023-08-18T13:01:28","modified_gmt":"2023-08-18T05:01:28","slug":"%e4%b8%80%e6%96%87%e5%b8%a6%e4%bd%a0%e8%af%bb%e6%87%82%e8%ae%be%e8%ae%a1%e6%a8%a1%e5%bc%8f%e4%b9%8b%e8%b4%a3%e4%bb%bb%e9%93%be%e6%a8%a1%e5%bc%8f-%e4%ba%ac%e4%b8%9c%e4%ba%91%e6%8a%80%e6%9c%af","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10008114","title":{"rendered":"\u4e00\u6587\u5e26\u4f60\u8bfb\u61c2\u8bbe\u8ba1\u6a21\u5f0f\u4e4b\u8d23\u4efb\u94fe\u6a21\u5f0f | \u4eac\u4e1c\u4e91\u6280\u672f\u56e2\u961f"},"content":{"rendered":"<h2>1.\u524d\u8a00<\/h2>\n<p>emm\uff0c\u7ffb\u4e86\u4e00\u4e0b\u4e4b\u524d\u521a\u5165\u804c\u65f6\u5019\u7684\u5b66\u4e60\u7b14\u8bb0\uff0c\u53d1\u73b0\u4e4b\u524d\u5728\u719f\u6089\u4e1a\u52a1\u4ee3\u7801\u7684\u65f6\u5019\u66fe\u7ecf\u4e13\u95e8\u5b66\u4e60\u5e76\u6574\u7406\u8fc7\u8fc7\u8bbe\u8ba1\u6a21\u5f0f\u4e2d\u7684<strong>\u8d23\u4efb\u94fe\u6a21\u5f0f<\/strong>\uff0c\u4e4b\u524d\u53ea\u662f\u5bf9\u5176\u7b80\u5355\u4e86\u89e3\u8fc7\u5e38\u7528\u7684\u8bbe\u8ba1\u6a21\u5f0f\u6709\u54ea\u4e9b\uff0c\u5e76\u672a\u7ed3\u5408\u5b9e\u4f8b\u548c\u6e90\u7801\u6df1\u5165\u5bf9\u5176\u63a2\u7a76\uff0c\u5229\u7528\u719f\u6089\u4ee3\u7801\u5951\u673a\u8fdb\u884c\u7cfb\u7edf\u5b66\u4e60\u5e76\u6574\u7406\u6587\u6863\u5982\u4e0b\u3002<\/p>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044126606\" alt=\"\" title=\"\"><\/p>\n<h2>2.\u4ec0\u4e48\u662f\u8d23\u4efb\u94fe\u6a21\u5f0f\uff1f<\/h2>\n<p>\u4fd7\u8bdd\u8bf4\u6ca1\u6709\u89c4\u77e9\u4e0d\u6210\u65b9\u5706\uff0c\u6211\u4eec\u65e0\u8bba\u5728\u5de5\u4f5c\u8fd8\u662f\u751f\u6d3b\u4e2d\u5f88\u591a\u4e8b\u60c5\u90fd\u9700\u8981\u6309\u7167\u89c4\u5b9a\u7684\u6d41\u7a0b\u529e\u4e8b\uff0c\u8fd9\u6837\u7684\u6d41\u7a0b\u5f80\u5f80\u90fd\u662f\u73af\u73af\u76f8\u6263\u7684\uff0c\u4e0a\u4e00\u90e8\u5b8c\u6210\u4e4b\u540e\u624d\u4f1a\u6d41\u8f6c\u5230\u4e0b\u4e00\u6b65\u6267\u884c\u3002\u6bd4\u5982\u6211\u4eec\u5728\u505a\u996d\u65f6\u90fd\u662f\u5148\u4e70\u83dc\u3001\u6d17\u83dc\u3001\u5207\u83dc\u3001\u7092\u83dc\u3001\u88c5\u76d8\u5728\u8fd9\u6837\u7684\u8fc7\u7a0b\u4e2d\u53ea\u6709\u4e0a\u4e00\u6b65\u5b8c\u6210\u4e4b\u540e\u624d\u80fd\u5f00\u59cb\u4e0b\u4e00\u6b65\u6700\u540e\u5f97\u5230\u4e00\u9053\u505a\u597d\u7684\u83dc\uff1b\u53c8\u6bd4\u5982\u5728\u664b\u5347\u63d0\u540d\u65f6\uff0c\u9996\u5148\u6211\u4eec\u8981\u505a\u4e00\u4e2a\u8ff0\u804c\u62a5\u544a\u8fdb\u884c\u8ff0\u804c\uff0c\u7136\u540e\u5c31\u662f\u8bc4\u5ba1\u5c0f\u7ec4\u6253\u5206\uff0c\u8bc4\u5ba1\u5c0f\u7ec4\u7b5b\u9009\u901a\u8fc7\u540e\uff0c\u6d41\u8f6c\u5230\u9879\u76ee\u7ec4\u9886\u5bfc\u5904\u5ba1\u6279\uff0c\u9879\u76ee\u7ec4\u9886\u5bfc\u6839\u636e\u8ff0\u804c\u62a5\u544a\u548c\u8bc4\u5ba1\u5c0f\u7ec4\u5206\u6570\u51b3\u5b9a\u662f\u5426\u664b\u5347\uff0c\u9879\u76ee\u7ec4\u9886\u5bfc\u540c\u610f\u4e4b\u540e\u6700\u540e\u6d41\u8f6c\u5230\u90e8\u95e8\u9886\u5bfc\u5ba1\u6279\u5e76\u7ed9\u51fa\u6700\u540e\u7ed3\u679c\u3002\u50cf\u8fd9\u79cd\u4e00\u6b65\u4e00\u6b65\u5b8c\u6210\u6d41\u7a0b\u90fd\u53ef\u4ee5\u901a\u8fc7\u8d23\u4efb\u94fe\u6a21\u5f0f\u6765\u5b9e\u73b0\u3002<\/p>\n<ul>\n<li><strong>\u7b80\u4ecb\uff1a<\/strong> \u8d23\u4efb\u94fe\u6a21\u5f0f\u987e\u540d\u601d\u4e49\u662f\u5c06\u4e0d\u540c\u804c\u8d23\u7684\u6b65\u9aa4\u4e32\u8054\u8d77\u6765\u6267\u884c\uff0c\u5e76\u4e14\u4e00\u4e2a\u6b65\u9aa4\u6267\u884c\u5b8c\u6210\u4e4b\u540e\u624d\u80fd\u591f\u6267\u884c\u4e0b\u4e00\u4e2a\u6b65\u9aa4\u3002\u4ece\u540d\u5b57\u53ef\u4ee5\u770b\u51fa\u901a\u5e38\u8d23\u4efb\u94fe\u6a21\u5f0f\u4f7f\u7528\u94fe\u8868\u6765\u5b8c\u6210\u3002\u56e0\u6b64\u5f53\u6267\u884c\u4efb\u52a1\u7684\u8bf7\u6c42\u53d1\u8d77\u65f6\uff0c\u4ece\u8d23\u4efb\u94fe\u4e0a\u7b2c\u4e00\u6b65\u5f00\u59cb\u5f80\u4e0b\u4f20\u9012\uff0c\u76f4\u5230\u6700\u540e\u4e00\u4e2a\u6b65\u9aa4\u5b8c\u6210\u3002\u5728\u8d23\u4efb\u94fe\u6a21\u5f0f\u5f53\u4e2d\uff0c\u5ba2\u6237\u7aef\u53ea\u7528\u6267\u884c\u4e00\u6b21\u6d41\u7a0b\u5f00\u59cb\u7684\u8bf7\u6c42\u4fbf\u4e0d\u518d\u9700\u8981\u53c2\u4e0e\u5230\u6d41\u7a0b\u6267\u884c\u5f53\u4e2d\uff0c\u8d23\u4efb\u94fe\u4e0a\u7684\u6d41\u7a0b\u4fbf\u80fd\u591f\u81ea\u5df1\u4e00\u76f4\u5f80\u4e0b\u6267\u884c\uff0c\u5ba2\u6237\u7aef\u540c\u6837\u4e5f\u5e76\u4e0d\u5173\u5fc3\u6267\u884c\u6d41\u7a0b\u7ec6\u8282\uff0c\u4ece\u800c\u5b9e\u73b0\u4e0e\u6d41\u7a0b\u4e4b\u95f4\u7684\u89e3\u8026\u3002<\/li>\n<\/ul>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044126607\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<ul>\n<li><strong>\u6a21\u5f0f\u7ed3\u6784<\/strong>\uff1a\u8d23\u4efb\u94fe\u6a21\u5f0f\u4e3b\u8981\u89d2\u8272\u5982\u4e0b\uff1a<\/li>\n<\/ul>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044126608\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<p>\u25e6<strong>\u62bd\u8c61\u5904\u7406\u5668\uff08Handler\uff09<\/strong>\uff1a\u5904\u7406\u5668\u62bd\u8c61\u63a5\u53e3\uff0c\u5b9a\u4e49\u4e86\u5904\u7406\u8bf7\u6c42\u7684\u65b9\u6cd5\u548c\u6267\u884c\u4e0b\u4e00\u6b65\u5904\u7406\u7684\u5904\u7406\u5668\u3002<\/p>\n<p>\u25e6<strong>\u5177\u4f53\u5904\u7406\u5668\uff08ConcreteHandler\uff09<\/strong>\uff1a\u6267\u884c\u8bf7\u6c42\u7684\u5177\u4f53\u5b9e\u73b0\uff0c\u5148\u6839\u636e\u8bf7\u6c42\u6267\u884c\u5904\u7406\u903b\u8f91\uff0c\u5b8c\u6210\u4e4b\u540e\u5c06\u8bf7\u6c42\u4ea4\u7ed9\u4e0b\u4e00\u4e2a\u5904\u7406\u5668\u6267\u884c\u3002<\/p>\n<p>\u25e6<strong>\u8c03\u7528\u8005<\/strong>\uff1a\u8c03\u7528\u8005\u901a\u8fc7\u521b\u5efa\u5904\u7406\u5668\u5e76\u5c06\u8bf7\u6c42\u4ea4\u7ed9\u5904\u7406\u5668\u8fdb\u884c\u5904\u7406\u3002<\/p>\n<ul>\n<li><strong>\u76f8\u5173\u4ee3\u7801\uff1a<\/strong><\/li>\n<\/ul>\n<pre><code>\/\/ \u62bd\u8c61\u5904\u7406\u5668\npublic abstract class Handler {\n    private Handler next;\n\n    public Handler getNext() {\n        return next;\n    }\n\n    public void setNext(Handler next) {\n        this.next = next;\n    }\n    public abstract void handle(Object request);\n}\n\n\/\/ \u5177\u4f53\u5904\u7406\u5668 1\npublic class ConcreteHandler1 extends Handler {\n    @Override\n    public void handle(Object request) {\n        System.out.println(&quot;concrete handler 1 execute request. request: &quot; + request);\n        if (getNext() != null) {\n            getNext().handle(request);\n        }\n    }\n}\n\n\/\/ \u5177\u4f53\u5904\u7406\u5668 2\npublic class ConcreteHandler2 extends Handler {\n    @Override\n    public void handle(Object request) {\n        System.out.println(&quot;concrete handler 2 execute request. request: &quot; + request);\n        if (getNext() != null){\n            getNext().handle(request);\n        }\n    }\n}\n\n\/\/ \u5177\u4f53\u5904\u7406\u5668 3\npublic class ConcreteHandler3 extends Handler {\n    @Override\n    public void handle(Object request) {\n        System.out.println(&quot;concrete handler 3 execute request. request: &quot; + request);\n        if (getNext() != null) {\n            getNext().handle(request);\n        }\n    }\n}\n\n\npublic static void main(String[] args) {\n    Handler concreteHandler1 = new ConcreteHandler1();\n    Handler concreteHandler2 = new ConcreteHandler2();\n    Handler concreteHandler3 = new ConcreteHandler3();\n\n    concreteHandler1.setNext(concreteHandler2);\n    concreteHandler2.setNext(concreteHandler3);\n\n    concreteHandler1.handle(&quot;my request.&quot;);\n}\n\n\n\n<\/code><\/pre>\n<p>\u4ece\u4e0a\u9762\u7684\u4ee3\u7801\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u5176\u5b9e\u8d23\u4efb\u94fe\u6a21\u5f0f\u662f\u975e\u5e38\u7b80\u5355\u7684\uff0c\u4f46\u662f\u5176\u4e2d\u6709\u51e0\u4e2a\u70b9\u9700\u8981\u6ce8\u610f\u4e00\u4e0b\uff1a<\/p>\n<ul>\n<li>\u9996\u5148\u6211\u4eec\u9700\u8981\u5bf9\u6574\u4e2a\u8d23\u4efb\u94fe\u8fdb\u884c\u521d\u59cb\u5316\uff0c\u5373\u8bbe\u7f6e\u6bcf\u4e2a\u5904\u7406\u5668\u7684 <strong>next<\/strong>\u3002<\/li>\n<li>\u5728\u6bcf\u4e2a\u5177\u4f53\u5904\u7406\u5668\u5904\u7406\u5b8c\u4e4b\u540e\u9700\u8981\u624b\u52a8\u8c03\u7528\u4e0b\u4e00\u4e2a\u5904\u7406\u5668\u7684 <strong>handle<\/strong> \u65b9\u6cd5\u6765\u6267\u884c\u4e0b\u4e00\u6b65\u5904\u7406\uff0c\u8fd9\u91cc\u5176\u5b9e\u8fd8\u53ef\u4ee5\u4f7f\u7528<strong>\u6a21\u677f\u65b9\u6cd5\u6a21\u5f0f<\/strong>\u8fdb\u884c\u4f18\u5316\u3002<\/li>\n<\/ul>\n<p><strong>\u63a7\u5236\u53f0\u8f93\u51fa\u5982\u4e0b\uff1a<\/strong><\/p>\n<pre><code>concrete handler 1 execute request. request: my request.\nconcrete handler 2 execute request. request: my request.\nconcrete handler 3 execute request. request: my request.\n\n\n\n<\/code><\/pre>\n<h2>3.\u5177\u4f53\u5b9e\u4f8bdemo<\/h2>\n<p>\u4ee5<strong>\u65e5\u5e38\u8bf7\u5047<\/strong>\u4e3a\u4f8b\u3002\u8bf7\u5047\u7533\u8bf7\u4f1a\u5148\u5230\u4f60\u7684<strong>\u76f4\u5c5e leader<\/strong> \u5904\u5ba1\u6279\uff0c\u5ba1\u6279\u901a\u8fc7\u540e\u518d\u5230<strong>\u90e8\u95e8 leader<\/strong> \u5904\u5ba1\u6279\uff0c\u90e8\u95e8 leader \u901a\u8fc7\u540e\uff0c\u6700\u540e\u5230\u4eba\u4e8b\u5904\u62a5\u5907\u8bb0\u5f55\u8bf7\u5047\u5929\u6570\u3002\u5982\u679c\u5728\u4f20\u7edf\u4f01\u4e1a\u91cc\u9762\uff0c\u6211\u4eec\u9700\u8981\u624b\u5199\u4e00\u4efd\u8bf7\u5047\u8868\uff0c\u7136\u540e\u8dd1\u5230\u76f4\u5c5e leader \u529e\u516c\u5ba4\uff0c\u8ba9\u76f4\u5c5e leader \u7b7e\u5b57\uff0c\u7136\u540e\u518d\u5230\u90e8\u95e8 leader \u529e\u516c\u5ba4\u7b7e\u5b57\uff0c\u6700\u540e\u8fd8\u8981\u8dd1\u5230\u4eba\u4e8b\u5904\u4e0a\u4ea4\u8bf7\u5047\u5355\uff0c\u8fd9\u6837\u76f8\u5f53\u4e8e\u53d1\u51fa\u4e86<strong>\u4e09\u6b21\u8bf7\u6c42<\/strong>\uff0c\u624d\u80fd\u8d70\u5b8c\u6574\u4e2a\u8bf7\u5047\u6d41\u7a0b\u3002<\/p>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044126609\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<p>\u4f46\u662f\u5728\u73b0\u4ee3\u5404\u79cd OA \u7cfb\u7edf\u7ba1\u7406\u4e0b\uff0c\u6574\u4e2a\u8bf7\u5047\u6d41\u7a0b\u5c31\u53d8\u7684\u7b80\u5355\u4e86\uff0c\u6211\u4eec\u53ea\u9700\u8981\u53d1\u8d77\u4e00\u6b21\u8bf7\u5047\u8bf7\u6c42\uff0c\u63a5\u4e0b\u6765\u4f60\u7684\u8bf7\u5047\u8bf7\u6c42\u4fbf\u4f1a\u81ea\u52a8\u7684\u5728\u5ba1\u6279\u4eba\u4e2d\u95f4\u8fdb\u884c\u6d41\u8f6c\uff0c\u8fd9\u4e2a\u65f6\u5019\u6211\u4eec\u7684\u8d23\u4efb\u94fe\u6a21\u5f0f\u4fbf\u6d3e\u4e0a\u7528\u573a\u3002\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<pre><code>\/\/ \u8bf7\u5047\u62bd\u8c61\u5904\u7406\u5668\npublic abstract class DayOffHandler {\n    private DayOffHandler next;\n\n    public DayOffHandler getNext() {\n        return next;\n    }\n\n    public void setNext(DayOffHandler next) {\n        this.next = next;\n    }\n    public abstract void handle(String request);\n\n}\n\/\/ \u76f4\u5c5e leader \u5904\u7406\npublic class GroupLeaderHandler extends DayOffHandler {\n    @Override\n    public void handle(String request) {\n        System.out.println(&quot;\u76f4\u5c5e leader \u5ba1\u67e5: &quot; + request);\n        System.out.println(&quot;\u540c\u610f\u8bf7\u6c42&quot;);\n        if (getNext() != null) {\n            getNext().handle(request);\n        }\n    }\n}\n\/\/ \u90e8\u95e8 leader \u5904\u7406\npublic class DepartmentLeaderHandler extends DayOffHandler{\n    @Override\n    public void handle(String request) {\n        System.out.println(&quot;\u90e8\u95e8 leader \u5ba1\u67e5: &quot; + request);\n        System.out.println(&quot;\u540c\u610f\u8bf7\u6c42&quot;);\n        if (getNext() != null) {\n            getNext().handle(request);\n        }\n    }\n}\n\/\/ \u4eba\u4e8b\u5904\u5904\u7406\npublic class HRHandler extends DayOffHandler {\n    @Override\n    public void handle(String request) {\n        System.out.println(&quot;\u4eba\u4e8b\u5904\u5ba1\u67e5: &quot; + request);\n        System.out.println(&quot;\u540c\u610f\u8bf7\u6c42\uff0c\u8bb0\u5f55\u8bf7\u5047&quot;);\n        if (getNext() != null) {\n            getNext().handle(request);\n        }\n    }\n}\n\n\n\n\n<\/code><\/pre>\n<p>\u4e0a\u9762\u7684\u4ee3\u7801\u5b9a\u4e49\u4e86<strong>\u8bf7\u5047\u62bd\u8c61\u5904\u7406\u7c7b<\/strong>\u548c\u4e09\u4e2a\u5177\u4f53\u7684\u5904\u7406\u4eba\uff0c\u6211\u4eec\u9700\u8981\u5c06\u8fd9\u4e09\u4e2a\u5904\u7406\u4eba\u7684\u6d41\u7a0b\u521d\u59cb\u5316<strong>\u4e32\u8054<\/strong>\u8d77\u6765\uff0c\u5e76\u4e14\u4e00\u6b65\u6b65\u7684\u6267\u884c\u4e0b\u53bb\uff0c\u50cf\u4e0b\u9762\u8fd9\u5f20\u56fe\u6240\u793a\u6d41\u7a0b\u4e00\u6837\uff0c\u4e8e\u662f\u5ba2\u6237\u7aef\u7684\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<pre><code>public static void main(String[] args) {\n\n    DayOffHandler groupLeaderHandler = new GroupLeaderHandler();\n    DayOffHandler departmentLeaderHandler = new DepartmentLeaderHandler();\n    DayOffHandler hrHandler = new HRHandler();\n    groupLeaderHandler.setNext(departmentLeaderHandler);\n    departmentLeaderHandler.setNext(hrHandler);\n\n    System.out.println(&quot;\u6536\u5230\u9762\u8bd5\u901a\u77e5\uff0c\u9700\u8981\u8bf7\u5047&quot;);\n    String request = &quot;\u5bb6\u4e2d\u6709\u4e8b\uff0c\u8bf7\u5047\u534a\u5929\uff0c\u671b\u6279\u51c6&quot;;\n    System.out.println(&quot;\u53d1\u8d77\u8bf7\u6c42\uff1a&quot;);\n    groupLeaderHandler.handle(request);\n}\n\n\n\n<\/code><\/pre>\n<p>\u4ece<strong>\u5ba2\u6237\u7aef\u4ee3\u7801<\/strong>\u4e2d\u53ef\u4ee5\u770b\u5230\uff0c\u6211\u4eec\u9996\u5148\u5b9e\u4f8b\u5316\u4e86\u4e09\u4e2a\u5177\u4f53\u5904\u7406\u4eba\uff0c\u7136\u540e\u901a\u8fc7 <strong>setNext<\/strong> \u65b9\u6cd5\u5c06\u4ed6\u4eec\u4e32\u8054\u8d77\u6765\uff0c\u800c\u6211\u4eec\u53ea\u9700\u5411\u76f4\u5c5e leader \u53d1\u8d77\u4e00\u6b21\u8bf7\u5047\u8bf7\u6c42\u5373\u53ef\uff0c\u6574\u4e2a\u5ba1\u6279\u6d41\u7a0b\u4fbf\u80fd\u591f\u81ea\u52a8\u7684\u6267\u884c\u4e0b\u53bb\uff0c\u4e0d\u9700\u8981\u518d\u6328\u4e2a\u8dd1\u529e\u516c\u5ba4\u7533\u8bf7\u4e86\u3002\u6267\u884c\u540e\u7684\u7ed3\u679c\u5982\u4e0b\uff1a<\/p>\n<pre><code>\u6536\u5230\u9762\u8bd5\u901a\u77e5\uff0c\u9700\u8981\u8bf7\u5047\n\u53d1\u8d77\u8bf7\u6c42\uff1a\n\u76f4\u5c5e leader \u5ba1\u67e5: \u5bb6\u4e2d\u6709\u4e8b\uff0c\u8bf7\u5047\u534a\u5929\uff0c\u671b\u6279\u51c6\n\u540c\u610f\u8bf7\u6c42\n\u90e8\u95e8 leader \u5ba1\u67e5: \u5bb6\u4e2d\u6709\u4e8b\uff0c\u8bf7\u5047\u534a\u5929\uff0c\u671b\u6279\u51c6\n\u540c\u610f\u8bf7\u6c42\n\u4eba\u4e8b\u5904\u5ba1\u67e5: \u5bb6\u4e2d\u6709\u4e8b\uff0c\u8bf7\u5047\u534a\u5929\uff0c\u671b\u6279\u51c6\n\u540c\u610f\u8bf7\u6c42\uff0c\u8bb0\u5f55\u8bf7\u5047\n\n\n\n<\/code><\/pre>\n<h2>4.\u8d23\u4efb\u94fe\u6a21\u5f0f\u5728\u6e90\u7801\u4e2d\u7684\u5e94\u7528<\/h2>\n<p>\u8bf4\u5230\u8d23\u4efb\u94fe\u6a21\u5f0f\uff0c\u90a3\u4e48\u6700\u8457\u540d\u7684\u5f53\u7136\u662f <strong>Servlet<\/strong> \u4e2d\u7684<strong>\u8fc7\u6ee4\u5668 Filter<\/strong> \u4e86\uff0c\u5728\u8fd9<strong>\u62e6\u622a\u5668\u548c\u8fc7\u6ee4\u5668<\/strong>\u7684\u4f53\u7cfb\u4e2d\u90fd\u4f7f\u7528\u8d23\u4efb\u94fe\u6a21\u5f0f\u6765\u4f9d\u6b21\u5904\u7406\u6bcf\u4e2a\u8bf7\u6c42\uff0c\u9996\u5148\u770b\u770b\u8fc7\u6ee4\u5668 Filter \u7684\u4f7f\u7528\u65b9\u5f0f\u3002Filter \u63a5\u53e3\u5982\u4e0b\uff1a<\/p>\n<pre><code>public interface Filter {\n    default void init(FilterConfig filterConfig) throws ServletException {\n    }\n\n    void doFilter(ServletRequest var1, ServletResponse var2, FilterChain var3) throws IOException, ServletException;\n\n    default void destroy() {\n    }\n}\n\n\n<\/code><\/pre>\n<ul>\n<li><strong>FilterChain<\/strong> \u4fbf\u662f\u8fc7\u6ee4\u5668 Filter \u7684\u4e00\u6761\u8d23\u4efb\u94fe\uff0c\u5176\u4ee3\u7801\u5982\u4e0b\uff1a<\/li>\n<\/ul>\n<pre><code>public interface FilterChain {\n    void doFilter(ServletRequest var1, ServletResponse var2) throws IOException, ServletException;\n}\n\n\npublic final class ApplicationFilterChain implements FilterChain {\n    \n    public void doFilter(ServletRequest request, ServletResponse response) throws IOException, ServletException {\n        if (Globals.IS_SECURITY_ENABLED) {\n            final ServletRequest req = request;\n            final ServletResponse res = response;\n\n            try {\n                AccessController.doPrivileged(new PrivilegedExceptionAction&lt;Void&gt;() {\n                    public Void run() throws ServletException, IOException {\n                        ApplicationFilterChain.this.internalDoFilter(req, res);\n                        return null;\n                    }\n                });\n            } catch (PrivilegedActionException var7) {\n                Exception e = var7.getException();\n                if (e instanceof ServletException) {\n                    throw (ServletException)e;\n                }\n\n                if (e instanceof IOException) {\n                    throw (IOException)e;\n                }\n\n                if (e instanceof RuntimeException) {\n                    throw (RuntimeException)e;\n                }\n\n                throw new ServletException(e.getMessage(), e);\n            }\n        } else {\n            this.internalDoFilter(request, response);\n        }\n\n    }\n\n    private void internalDoFilter(ServletRequest request, ServletResponse response) throws IOException, ServletException {\n        if (this.pos &lt; this.n) {\n            ApplicationFilterConfig filterConfig = this.filters[this.pos++];\n\n            try {\n                Filter filter = filterConfig.getFilter();\n                if (request.isAsyncSupported() &amp;&amp; &quot;false&quot;.equalsIgnoreCase(filterConfig.getFilterDef().getAsyncSupported())) {\n                    request.setAttribute(&quot;org.apache.catalina.ASYNC_SUPPORTED&quot;, Boolean.FALSE);\n                }\n\n                if (Globals.IS_SECURITY_ENABLED) {\n                    Principal principal = ((HttpServletRequest)request).getUserPrincipal();\n                    Object[] args = new Object[]{request, response, this};\n                    SecurityUtil.doAsPrivilege(&quot;doFilter&quot;, filter, classType, args, principal);\n                } else {\n                    filter.doFilter(request, response, this);\n                }\n\n            } catch (ServletException | RuntimeException | IOException var15) {\n                throw var15;\n            } catch (Throwable var16) {\n                Throwable e = ExceptionUtils.unwrapInvocationTargetException(var16);\n                ExceptionUtils.handleThrowable(e);\n                throw new ServletException(sm.getString(&quot;filterChain.filter&quot;), e);\n            }\n        } else {\n            try {\n                if (ApplicationDispatcher.WRAP_SAME_OBJECT) {\n                    lastServicedRequest.set(request);\n                    lastServicedResponse.set(response);\n                }\n\n                if (request.isAsyncSupported() &amp;&amp; !this.servletSupportsAsync) {\n                    request.setAttribute(&quot;org.apache.catalina.ASYNC_SUPPORTED&quot;, Boolean.FALSE);\n                }\n\n                if (request instanceof HttpServletRequest &amp;&amp; response instanceof HttpServletResponse &amp;&amp; Globals.IS_SECURITY_ENABLED) {\n                    Principal principal = ((HttpServletRequest)request).getUserPrincipal();\n                    Object[] args = new Object[]{request, response};\n                    SecurityUtil.doAsPrivilege(&quot;service&quot;, this.servlet, classTypeUsedInService, args, principal);\n                } else {\n                    this.servlet.service(request, response);\n                }\n            } catch (ServletException | RuntimeException | IOException var17) {\n                throw var17;\n            } catch (Throwable var18) {\n                Throwable e = ExceptionUtils.unwrapInvocationTargetException(var18);\n                ExceptionUtils.handleThrowable(e);\n                throw new ServletException(sm.getString(&quot;filterChain.servlet&quot;), e);\n            } finally {\n                if (ApplicationDispatcher.WRAP_SAME_OBJECT) {\n                    lastServicedRequest.set((Object)null);\n                    lastServicedResponse.set((Object)null);\n                }\n\n            }\n\n        }\n    }\n}\n\n\n\n<\/code><\/pre>\n<ul>\n<li>\u5728 <strong>internalDoFilter()<\/strong> \u65b9\u6cd5\u4e2d\uff0c\u53ef\u4ee5\u770b\u5230\u6574\u4e2a <strong>FilterChain<\/strong> \u4e0a\u4f7f\u7528<strong>\u6570\u7ec4 filters<\/strong> \u5b58\u653e\u6bcf\u4e00\u4e2a\u8fc7\u6ee4\u5668\u53ca\u5176\u914d\u7f6e\u5e76\u4f7f\u7528 <strong>pos \u8bb0\u5f55<\/strong>\u5f53\u524d\u904d\u5386\u5230\u54ea\u4e00\u4e2a\u8fc7\u6ee4\u5668\uff0c\u7136\u540e\u518d\u6267\u884c\u83b7\u53d6\u5230\u7684 <strong>Filter<\/strong> \u7684 <strong>doFilter<\/strong> \u65b9\u6cd5\u3002\u4e0e\u524d\u9762\u6240\u8bb2\u94fe\u8868\u65b9\u5f0f\u5b58\u653e\u4e0d\u540c\uff0c\u8fd9\u91cc\u7684\u94fe\u8def\u4f7f\u7528\u6570\u7ec4\u6765\u8fdb\u884c\u5b58\u653e\u3002<\/li>\n<li><strong>spring\u4e2d\u7684\u8d23\u4efb\u94fe\u6a21\u5f0f<\/strong><\/li>\n<\/ul>\n<p>\u5728 <strong>SpringMVC<\/strong> \u4e2d\u7684 <strong>Interceptor<\/strong> \u540c\u6837\u4e5f\u7528\u5230\u4e86<strong>\u8d23\u4efb\u94fe\u6a21\u5f0f<\/strong>\u3002\u9996\u5148\u6765\u770b\u770b <strong>Interceptor<\/strong> \u7684\u62bd\u8c61\u5904\u7406\u7c7b;<\/p>\n<pre><code>public interface HandlerInterceptor {\n    default boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {\n        return true;\n    }\n\n    default void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, @Nullable ModelAndView modelAndView) throws Exception {\n    }\n\n    default void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, @Nullable Exception ex) throws Exception {\n    }\n}\n\n\n\n\n<\/code><\/pre>\n<p>\u5728\u62bd\u8c61\u5904\u7406\u7c7b\u4e2d\uff0c\u5b9a\u4e49\u4e86\u4e09\u4e2a\u65b9\u6cd5\uff0c\u5206\u522b\u662f\u5904\u7406\u524d\u7f6e\u5904\u7406\u5668\u3001\u540e\u7f6e\u5904\u7406\u5668\u548c\u6574\u4e2a\u6d41\u7a0b\u5b8c\u6210\u4e4b\u540e\u7684\u5904\u7406\u3002\u901a\u8fc7 <strong>HandlerExecutionChain<\/strong> \u5c06\u62e6\u622a\u5668\u4e32\u8054\u8d77\u6765\uff0c\u5728 <strong>HandlerExecutionChain<\/strong> \u4e2d\uff0c\u6211\u4eec\u9700\u8981\u5173\u6ce8 <strong>applyPreHandle<\/strong>\u3001<strong>applyPostHandle<\/strong> \u548c <strong>triggerAfterCompletion<\/strong> \u4e09\u4e2a\u65b9\u6cd5\uff0c\u8fd9\u4e09\u4e2a\u65b9\u6cd5\u5206\u522b\u6267\u884c\u4e86\u62e6\u622a\u5668\u4e2d\u6240\u5b9a\u4e49\u7684 <strong>preHandle<\/strong> \u3001<strong>postHandle<\/strong> \u548c <strong>afterCompletion<\/strong> \u65b9\u6cd5\u3002\u5e76\u4e14\u4ece\u4ee3\u7801\u4e2d\u4e5f\u80fd\u591f\u770b\u5904\uff0c\u548c\u524d\u9762\u7684\u8fc7\u6ee4\u5668\u4e00\u6837\uff0c\u6240\u6709\u7684\u62e6\u622a\u5668\u90fd\u5b58\u653e\u5728 <strong>interceptors<\/strong> \u6570\u7ec4\u4e2d\uff0c\u5e76\u5728\u4e09\u4e2a\u65b9\u6cd5\u4e2d\u904d\u5386 <strong>interceptors<\/strong> \u6570\u7ec4\u4f9d\u6b21\u6267\u884c\u76f8\u5e94\u7684\u65b9\u6cd5<\/p>\n<pre><code>public class HandlerExecutionChain {\n    @Nullable\n    private HandlerInterceptor[] interceptors;\n\n    boolean applyPreHandle(HttpServletRequest request, HttpServletResponse response) throws Exception {\n        HandlerInterceptor[] interceptors = this.getInterceptors();\n        if (!ObjectUtils.isEmpty(interceptors)) {\n            for(int i = 0; i &lt; interceptors.length; this.interceptorIndex = i++) {\n                HandlerInterceptor interceptor = interceptors[i];\n                if (!interceptor.preHandle(request, response, this.handler)) {\n                    this.triggerAfterCompletion(request, response, (Exception)null);\n                    return false;\n                }\n            }\n        }\n\n        return true;\n    }\n\n    void applyPostHandle(HttpServletRequest request, HttpServletResponse response, @Nullable ModelAndView mv) throws Exception {\n        HandlerInterceptor[] interceptors = this.getInterceptors();\n        if (!ObjectUtils.isEmpty(interceptors)) {\n            for(int i = interceptors.length - 1; i &gt;= 0; --i) {\n                HandlerInterceptor interceptor = interceptors[i];\n                interceptor.postHandle(request, response, this.handler, mv);\n            }\n        }\n\n    }\n\n    void triggerAfterCompletion(HttpServletRequest request, HttpServletResponse response, @Nullable Exception ex) throws Exception {\n        HandlerInterceptor[] interceptors = this.getInterceptors();\n        if (!ObjectUtils.isEmpty(interceptors)) {\n            for(int i = this.interceptorIndex; i &gt;= 0; --i) {\n                HandlerInterceptor interceptor = interceptors[i];\n\n                try {\n                    interceptor.afterCompletion(request, response, this.handler, ex);\n                } catch (Throwable var8) {\n                    logger.error(&quot;HandlerInterceptor.afterCompletion threw exception&quot;, var8);\n                }\n            }\n        }\n\n    }\n}\n\n\n\n<\/code><\/pre>\n<h2>5.\u603b\u7ed3<\/h2>\n<p>\u8d23\u4efb\u94fe\u6a21\u5f0f\u4e5f\u662f\u5e38\u89c1\u7684\u8bbe\u8ba1\u6a21\u5f0f\uff0c\u5404\u4e2a\u4e0d\u540c\u804c\u8d23\u7684\u5904\u7406\u5668\u4e32\u8054\u8d77\u6765\uff0c\u901a\u8fc7\u4e00\u6b21\u8bf7\u6c42\u4fbf\u80fd\u591f\u6267\u884c\u5b8c\u6bcf\u4e2a\u5904\u7406\u5668\u7684\u5904\u7406\u65b9\u6cd5\u3002\u901a\u8fc7\u8fd9\u6837\u7684\u65b9\u5f0f\u8bf7\u6c42\u7684\u53d1\u9001\u8005\u53ea\u9700\u53d1\u51fa\u4e00\u6b21\u8bf7\u6c42\u540c\u65f6\u4e5f\u4e0d\u9700\u8981\u77e5\u9053\u8be6\u7ec6\u7684\u94fe\u8def\u7ed3\u6784\uff1b\u800c\u8bf7\u6c42\u7684\u63a5\u9001\u65b9\u53ea\u5173\u5fc3\u81ea\u5df1\u7684\u5904\u7406\u903b\u8f91\uff0c\u81ea\u5df1\u5904\u7406\u5b8c\u6210\u4e4b\u540e\u5c06\u8bf7\u6c42\u4f20\u9012\u7ed9\u4e0b\u4e00\u4e2a\u63a5\u6536\u8005\uff0c\u4ece\u800c\u5b8c\u6210\u81ea\u5df1\u7684\u4efb\u52a1\uff0c\u8fd9\u6837\u4fbf\u5b9e\u73b0\u4e86\u8bf7\u6c42\u53d1\u9001\u8005\u548c\u63a5\u6536\u8005\u7684\u89e3\u8026\u3002\u800c\u4ece\u6e90\u7801\u5206\u6790\u4e2d\u53ef\u4ee5\u770b\u5230\uff0c\u8d23\u4efb\u94fe\u6a21\u5f0f\u867d\u7136\u5e38\u89c1\u4f7f\u7528\u94fe\u8868\u7ed3\u6784\uff0c\u4f46\u662f\u4f7f\u7528\u6570\u7ec4\u548c\u5217\u8868\u540c\u6837\u80fd\u591f\u5b8c\u6210\u9700\u6c42\u3002<\/p>\n<blockquote>\n<p>\u4f5c\u8005\uff1a\u4eac\u4e1c\u79d1\u6280 \u5b8b\u6167\u8d85<\/p>\n<p>\u6765\u6e90\uff1a\u4eac\u4e1c\u4e91\u5f00\u53d1\u8005\u793e\u533a<\/p>\n<\/blockquote>\n<p><a href=\"https:\/\/segmentfault.com\/a\/1190000044126604\">https:\/\/segmentfault.com\/a\/1190000044126604<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>1.\u524d\u8a00 emm\uff0c\u7ffb\u4e86\u4e00\u4e0b\u4e4b\u524d\u521a\u5165\u804c\u65f6\u5019\u7684\u5b66\u4e60\u7b14\u8bb0\uff0c\u53d1\u73b0\u4e4b\u524d\u5728\u719f\u6089\u4e1a\u52a1\u4ee3\u7801\u7684\u65f6\u5019\u66fe\u7ecf\u4e13\u95e8\u5b66\u4e60\u5e76\u6574\u7406\u8fc7\u8fc7\u8bbe\u8ba1\u6a21\u5f0f [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-10008114","post","type-post","status-publish","format-standard","hentry","category-share"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10008114","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=10008114"}],"version-history":[{"count":0,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10008114\/revisions"}],"wp:attachment":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10008114"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10008114"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10008114"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}