{"id":169417,"date":"2020-10-08T03:59:02","date_gmt":"2020-10-07T19:59:02","guid":{"rendered":"http:\/\/4563.org\/?p=169417"},"modified":"2020-10-08T03:59:02","modified_gmt":"2020-10-07T19:59:02","slug":"%e8%af%b7%e6%95%99%e4%b8%80%e4%b8%aa-java-%e5%8f%8d%e5%b0%84%e4%b8%8e%e5%8a%a8%e6%80%81%e4%bb%a3%e7%90%86%e7%9a%84%e9%97%ae%e9%a2%98%e5%8a%a8%e6%80%81%e4%bb%a3%e7%90%86%e7%94%9f%e6%88%90%e7%9a%84","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=169417","title":{"rendered":"\u8bf7\u6559\u4e00\u4e2a Java \u53cd\u5c04\u4e0e\u52a8\u6001\u4ee3\u7406\u7684\u95ee\u9898:\u52a8\u6001\u4ee3\u7406\u751f\u6210\u7684\u5bf9\u8c61\u901a\u8fc7\u53cd\u5c04\u8bbe\u7f6e\u62a5\u9519"},"content":{"rendered":"
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\u8bf7\u6559\u4e00\u4e2a Java \u53cd\u5c04\u4e0e\u52a8\u6001\u4ee3\u7406\u7684\u95ee\u9898:\u52a8\u6001\u4ee3\u7406\u751f\u6210\u7684\u5bf9\u8c61\u901a\u8fc7\u53cd\u5c04\u8bbe\u7f6e\u62a5\u9519 <\/h1>\n

<\/p>\n

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\u8cc7\u6df1\u5927\u4f6c : cqdx02 <\/span> <\/i> 3<\/span> <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
<\/p>\n

\u6bd4\u5982\u5b9a\u4e49\u4e86\u4e00\u4e2a\u63a5\u53e3 IHello:<\/p>\n

interface IHello {   void printHello(); } <\/code><\/pre>\n
\u4ee5\u53ca\u4e00\u4e2a User \u7c7b\uff1a<\/p>\n
class User {    IHello ihello;    public User(){}    public void setIHello(IHello hello){      this.ihello = hello;   }    public void sayHello(){      iHello.printHello();   }  } <\/code><\/pre>\n
\u5728\u5b9e\u9645\u8c03\u7528\u65f6\uff0c\u91c7\u7528\u52a8\u6001\u4ee3\u7406\u5148\u751f\u4ea7 IHello \u7684\u5b9e\u4f8b\uff0c\u7136\u540e\u8bbe\u7f6e\u5230 User \u5bf9\u8c61\u4e2d\u8c03\u7528\u662f\u53ef\u4ee5\u7684\uff1a<\/p>\n
Ihello hello = (IHello) new DynamicProxy().bind(new Hello());  User user = new User();  user.setIHello(hello);  user.sayHello(); <\/code><\/pre>\n
\u73b0\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u6211\u8981\u901a\u8fc7\u53cd\u5c04\u7684\u65b9\u5f0f\u8bbe\u7f6e User \u4e2d\u7684\u6210\u5458\u53d8\u91cf\uff0c\u6211\u662f\u8fd9\u4e48\u5199\u7684\uff1a<\/p>\n
Ihello hello = (IHello) new DynamicProxy().bind(new Hello());  User user = new User();  Class<?> parmeter = new Class[1];  parmeter[0] = hello.getClass();  \/\/ \u83b7\u53d6\u65b9\u6cd5\u65f6\u51fa\u9519  Method setHello = user.getClass().getDeclaredMethod(\"setIHello\", parmeter);  setHello.invoke(user,hello); <\/code><\/pre>\n
\u5728\u4e0a\u9762\u4e00\u53e5\u83b7\u53d6\u65b9\u6cd5\u65f6\u51fa\u9519\u4e86\uff0c\u62a5\u9519\u5185\u5bb9\u4e3a NoSuchMethodException,\u56e0\u4e3a parmeter \u7c7b\u578b\u4e0d\u5bf9\u3002<\/p>\n
\u8bf7\u6559\u5e94\u8be5\u600e\u4e48\u6539\u5462\uff1f<\/p>\n
\uff08\u4e0a\u9762\u90a3\u53e5\u6539\u6210 getDeclaredMethod(“setIHello”, IHello.class)\u80af\u5b9a\u662f\u53ef\u4ee5\u7684\uff0c\u95ee\u9898\u662f\u73b0\u5728\u4e0d\u5e0c\u671b\u6307\u5b9a\u7c7b\u578b\uff0c\u800c\u5e0c\u671b parmeter \u662f\u52a8\u6001\u751f\u6210\u7684\uff09<\/p>\n<\/p><\/div>\n
 \u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (7<\/span>)        <\/div>\n
 <\/div>\n<\/p><\/div>\n<\/p><\/div>\n
    \n
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     \u8cc7\u6df1\u5927\u4f6c : JasonLaw <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 hello.getClass() != IHello.class                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : cqdx02 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @JasonLaw \u55ef\u55ef\uff0c\u90a3\u5e94\u8be5\u5982\u4f55\u6539\u5462\uff1f                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : JasonLaw <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @cqdx02 #2 \u6211\u5e0c\u671b\u4f60\u63d0\u4f9b\u5b8c\u6574\u7684\u4ee3\u7801\uff0c\u4f60\u8d34\u51fa\u7684\u4ee3\u7801\u4e0d\u4ec5\u4ec5\u6709\u9519\u8bef\u3001\u4e0d\u5b8c\u6574\uff0c\u4e5f\u4e0d\u77e5\u9053 DynamicProxy \u5230\u5e95\u662f\u54ea\u91cc\u6765\u7684\u3002                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : cqdx02 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @JasonLaw \u597d\u7684\uff0c\u6211\u53ea\u8d34\u4e86\u62a5\u9519\u7684\u90a3\u90e8\u5206\uff0c\u665a\u4e0a\u56de\u53bb\u8865\u5168\u4e0b\u3002                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : young1lin <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u4f60\u8fd9\u6837\u5199\u80af\u5b9a\u662f\u9519\u7684\u554a\uff0c\u4f1a\u4e0d\u4f1a\u7528\u53cd\u5c04\uff1f IDEA \u6ca1\u63d0\u793a\uff1f<\/p>\n
    parmeter[0] = hello.getClass();<\/p>\n
    \/\/ \u83b7\u53d6\u65b9\u6cd5\u65f6\u51fa\u9519<\/p>\n
    Method setHello = user.getClass().getDeclaredMethod(“setIHello”, parmeter);
    \u9996\u5148\uff0c\u4f60\u8fd9\u83b7\u53d6\u7684\u662f\u5177\u4f53\u7684\u5b9e\u4f53\u7c7b\uff0c\u4f46\u662f\u8fd9\u91cc\u662f\u8981\u6c42\u4f60\u6839\u636e\u65b9\u6cd5\u540d\u548c\u65b9\u6cd5\u53c2\u6570\u7c7b\u578b\uff0c\u6765\u83b7\u5f97\u5177\u4f53\u7684\u65b9\u6cd5\u5bf9\u8c61\u53e5\u67c4\u3002\u4f60\u4e5f\u53ef\u4ee5\u7406\u89e3\u4e3a\u83b7\u5f97\u65b9\u6cd5\u7684\u5b9a\u4e49\uff0c\u65b9\u6cd5\u7684\u5916\u58f3\u3002<\/p>\n
    \u540e\u9762\u7684 method.invoke \u662f\u4f20\u5177\u4f53\u53c2\u6570\uff0c\u5982\u679c\u4f60\u8fd9\u91cc\u4f20\u7684\u662f hello.getClass() \u8fd9\u91cc\u83b7\u53d6\u7684\u662f\u5177\u4f53\u7684\u7c7b\uff0c\u6bd4\u5982 Hello.class\uff0c\u800c\u4e0d\u662f IHello.class \u3002<\/p>\n
    \u4f60\u53ef\u4ee5\u6253\u4e2a\u65ad\u70b9\u770b\u770b\u5230\u5e95\u662f\u600e\u4e48\u56de\u4e8b\uff0c\u4ed6\u5c31\u4f1a\u53bb\u627e setIHello(Hello hello)\uff0c\u800c\u4e0d\u662f setIHello(IHello iHello)\u65b9\u6cd5\uff0c\u5f53\u7136\u4f1a\u62a5\u6ca1\u6709\u8fd9\u6837\u7684\u65b9\u6cd5\u7684\u9519\u8bef\u3002\u4f60\u628a\u8fd9\u4e2a<\/p>\n
    Method setHello = user.getClass().getDeclaredMethod(“setIHello”, parmeter);<\/p>\n
    parrmeter \u6539\u6210 IHello.class \u4e0d\u5c31\u597d\u4e86\uff1f<\/p>\n
    \u6211\u5efa\u8bae\u4f60\u597d\u597d\u5728 \u300a Java \u7f16\u7a0b\u601d\u60f3\u300b\u91cc\u9762\u597d\u597d\u770b\u770b\u5173\u4e8e\u53cd\u5c04\u7684\u90a3\u4e00\u7ae0\u3002                                                            <\/p><\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : palmers <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \/\/ \u83b7\u53d6\u65b9\u6cd5\u65f6\u51fa\u9519<\/p>\n
    Method setHello = user.getClass().getDeclaredMethod(“setIHello”, parmeter);                                                            <\/p><\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : palmers <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @palmers \u8fd9\u53e5\u4f7f\u7528\u6cdb\u578b\u7ea6\u675f\u662f\u53ef\u4ee5\u7684                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n","protected":false},"excerpt":{"rendered":"
    \u8bf7\u6559\u4e00\u4e2a Java \u53cd\u5c04\u4e0e\u52a8\u6001\u4ee3\u7406…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[],"tags":[],"_links":{"self":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/169417"}],"collection":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=169417"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/169417\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=169417"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=169417"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=169417"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}