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\n<\/p>\n
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\u7136\u540e\u8003\u8651\u7528Java\u6765\u5b9e\u73b0\uff0c\u65e2\u7136\u662fOOP\uff0c\u5c31\u4e0d\u80fd\u4ec0\u4e48\u4ee3\u7801\u90fd\u585e\u5230main\u8fc7\u7a0b\u91cc\u9762\uff0c\u4e8e\u662f\u5c31\u8bbe\u8ba1\u4e86\u4e09\u4e2a\u7c7b\uff1a<\/p>\n
\u4e00\u4e2a\u7c7b\u662f\u8d1f\u8d23\u8bfb\u53d6\u6570\u636e\u5e93\uff0c\u53d6\u90ae\u4ef6\u5730\u5740\uff0c\u8c03\u7528qmail\u7684sendmail\u547d\u4ee4\u53d1\u9001\uff1b<\/p>\n
\u4e00\u4e2a\u7c7b\u662f\u8bfb\u90ae\u4ef6\u5185\u5bb9\uff0cMIME\u7f16\u7801\u6210HTML\u683c\u5f0f\u7684\uff0c\u518d\u52a0\u4e0a\u90ae\u4ef6\u5934\uff1b<\/p>\n
\u4e00\u4e2a\u4e3b\u7c7b\u8d1f\u8d23\u4ece\u547d\u4ee4\u8bfb\u53c2\u6570\uff0c\u5904\u7406\u547d\u4ee4\u884c\u53c2\u6570\uff0c\u8c03\u7528\u53d1email\u7684\u7c7b\u3002<\/p>\n
\u628a\u4e00\u4ef6\u5de5\u4f5c\u6309\u7167\u529f\u80fd\u5212\u5206\u4e3a3\u4e2a\u6a21\u5757\u5206\u522b\u5904\u7406\uff0c\u6bcf\u4e2a\u7c7b\u5b8c\u6210\u4e00\u4ef6\u6a21\u5757\u4efb\u52a1\u3002<\/p>\n
\u4ed4\u7ec6\u7684\u5206\u6790\u4e00\u4e0b\uff0c\u5c31\u4f1a\u53d1\u73b0\u8fd9\u6837\u7684\u8bbe\u8ba1\u5b8c\u5168\u662f\u4ece\u7a0b\u5e8f\u5458\u5b9e\u73b0\u7a0b\u5e8f\u529f\u80fd\u7684\u89d2\u5ea6\u6765\u8bbe\u8ba1\u7684\uff0c\u6216\u8005\u8bf4\uff0c\u8bbe\u8ba1\u7c7b\u7684\u65f6\u5019\uff0c\u662f\u81ea\u4f4e\u5411\u4e0a\u7684\uff0c\u4ece\u673a\u5668\u7684\u89d2\u5ea6\u5230\u73b0\u5b9e\u4e16\u754c\u7684\u89d2\u5ea6\u6765\u5206\u6790\u95ee\u9898\u7684\u3002\u56e0\u6b64\u5728\u8bbe\u8ba1\u7684\u65f6\u5019\uff0c\u5c31\u5df2\u7ecf\u628a\u7a0b\u5e8f\u7f16\u7a0b\u5b9e\u73b0\u7684\u7ec6\u8282\u90fd\u8003\u8651\u8fdb\u53bb\u4e86\uff0c\u4f01\u56fe\u4ece\u5e95\u5c42\u5b9e\u73b0\u7a0b\u5e8f\u8fd9\u6837\u7684\u51fa\u53d1\u70b9\u6765\u8fbe\u5230\u6ee1\u8db3\u73b0\u5b9e\u4e16\u754c\u7684\u8f6f\u4ef6\u9700\u6c42\u7684\u76ee\u6807\u3002<\/p>\n
\u8fd9\u6837\u7684\u5206\u6790\u65b9\u6cd5\u5176\u5b9e\u662f\u4e0d\u9002\u7528\u4e8eJava\u8fd9\u6837\u9762\u5411\u5bf9\u8c61\u7684\u7f16\u7a0b\u8bed\u8a00\uff0c\u56e0\u4e3a\uff0c\u5982\u679c\u6539\u7528C\u8bed\u8a00\uff0c\u5c01\u88c5\u4e24\u4e2aC\u51fd\u6570\uff0c\u90fd\u4f1a\u6bd4Java\u5b9e\u73b0\u8d77\u6765\u8f7b\u677e\u7684\u591a\uff0c\u903b\u8f91\u4e0a\u4e5f\u6e05\u695a\u7684\u591a\u3002<\/p>\n
\u6211\u89c9\u5f97\u9762\u5411\u5bf9\u8c61\u7684\u7cbe\u9ad3\u5728\u4e8e\u8003\u8651\u95ee\u9898\u7684\u601d\u8def\u662f\u4ece\u73b0\u5b9e\u4e16\u754c\u7684\u4eba\u7c7b\u601d\u7ef4\u4e60\u60ef\u51fa\u53d1\u7684\uff0c\u53ea\u8981\u9886\u4f1a\u4e86\u8fd9\u4e00\u70b9\uff0c\u5c31\u9886\u4f1a\u4e86\u9762\u5411\u5bf9\u8c61\u7684\u601d\u7ef4\u65b9\u6cd5\u3002<\/p>\n
\u4e3e\u4e00\u4e2a\u975e\u5e38\u7b80\u5355\u7684\u4f8b\u5b50\uff1a\u5047\u4f7f\u73b0\u5728\u9700\u8981\u5199\u4e00\u4e2a\u7f51\u9875\u8ba1\u6570\u5668\uff0c\u5ba2\u6237\u8bbf\u95ee\u4e00\u6b21\u9875\u9762\uff0c\u7f51\u9875\u8ba1\u6570\u5668\u52a01\uff0c\u8ba1\u6570\u5668\u662f\u8fd9\u6837\u6765\u8bbf\u95ee\u7684http:\/\/hostname\/count.cgi?id=xxx<\/p>\n
\u540e\u53f0\u6709\u4e00\u4e2a\u6570\u636e\u5e93\u8868\uff0c\u4fdd\u5b58\u6bcf\u4e2aid\uff08\u4e00\u4e2aid\u5bf9\u5e94\u4e00\u4e2a\u88ab\u7edf\u8ba1\u8bbf\u95ee\u6b21\u6570\u7684\u9875\u9762\uff09\u7684\u8ba1\u6570\u5668\u5f53\u524d\u503c\uff0c\u8bf7\u6c42\u9875\u9762\u4e00\u6b21\uff0c\u5bf9\u5e94id\u7684\u8ba1\u6570\u5668\u7684\u5b57\u6bb5\u52a01(\u8fd9\u91cc\u6211\u4eec\u5ffd\u7565\u5e76\u53d1\u66f4\u65b0\u6570\u636e\u5e93\u8868\uff0c\u51fa\u73b0\u7684\u8868\u9501\u5b9a\u7684\u95ee\u9898)\u3002<\/p>\n
\u5982\u679c\u6309\u7167\u4e00\u822c\u4ece\u7a0b\u5e8f\u5b9e\u73b0\u7684\u89d2\u5ea6\u6765\u5206\u6790\uff0c\u6211\u4eec\u4f1a\u8fd9\u6837\u8003\u8651\uff1a\u9996\u5148\u662f\u4eceHTTP GET\u8bf7\u6c42\u53d6\u5230id\uff0c\u7136\u540e\u6309\u7167id\u67e5\u6570\u636e\u5e93\u8868\uff0c\u83b7\u5f97\u67d0id\u5bf9\u5e94\u7684\u8bbf\u95ee\u8ba1\u6570\u503c\uff0c\u7136\u540e\u52a01\uff0c\u66f4\u65b0\u6570\u636e\u5e93\uff0c\u6700\u540e\u5411\u9875\u9762\u663e\u793a\u8bbf\u95ee\u8ba1\u6570\u3002<\/p>\n
\u73b0\u5728\u5047\u8bbe\u4e00\u4e2a\u6ca1\u6709\u7a0b\u5e8f\u8bbe\u8ba1\u7ecf\u9a8c\u7684\u4eba\uff0c\u4ed6\u4f1a\u600e\u6837\u6765\u601d\u8003\u8fd9\u4e2a\u95ee\u9898\u7684\u5462\uff1f\u4ed6\u4f1a\u63d0\u51fa\u4ec0\u4e48\u6837\u7684\u9700\u6c42\u5462\uff1f\u4ed6\u5f88\u53ef\u80fd\u4f1a\u8fd9\u6837\u60f3\uff1a<\/p>\n
\u6211\u9700\u8981\u6709\u4e00\u4e2a\u8ba1\u6570\u5668\uff0c\u8fd9\u4e2a\u8ba1\u6570\u5668\u5e94\u8be5\u6709\u8fd9\u6837\u7684\u529f\u80fd\uff0c\u5237\u65b0\u4e00\u6b21\u9875\u9762\uff0c\u8bbf\u95ee\u91cf\u5c31\u4f1a\u52a01\uff0c\u53e6\u5916\u6700\u597d\u8fd8\u6709\u4e00\u4e2a\u8ba1\u6570\u5668\u6e050\u7684\u529f\u80fd\uff0c\u5f53\u7136\u8ba1\u6570\u5668\u5982\u679c\u6709\u4e00\u4e2a\u53ef\u4ee5\u8bbe\u4e3a\u4efb\u610f\u503c\u7684\u529f\u80fd\u7684\u8bdd\uff0c\u6211\u5c31\u53ef\u4ee5\u4f5c\u5f0a\u4e86\u3002<\/p>\n
\u505a\u4e3a\u4e00\u4e2a\u6ca1\u6709\u7a0b\u5e8f\u8bbe\u8ba1\u7ecf\u9a8c\u7684\u4eba\u6765\u8bf4\uff0c\u4ed6\u5b8c\u5168\u4e0d\u4f1a\u60f3\u5230\u5bf9\u6570\u636e\u5e93\u5e94\u8be5\u5982\u4f55\u64cd\u4f5c\uff0c\u5bf9\u4e8eHTTP\u53d8\u91cf\u8be5\u5982\u4f55\u4f20\u9012\uff0c\u4ed6\u8003\u8651\u95ee\u9898\u7684\u89d2\u5ea6\u5c31\u662f\u6211\u6709\u4ec0\u4e48\u9700\u6c42\uff0c\u6211\u7684\u4e1a\u52a1\u903b\u8f91\u662f\u4ec0\u4e48\uff0c\u8f6f\u4ef6\u5e94\u8be5\u6709\u4ec0\u4e48\u529f\u80fd\u3002<\/p>\n
\u6309\u7167\u8fd9\u6837\u7684\u601d\u8def(\u8bf7\u6ce8\u610f\uff0c\u4ed6\u7684\u601d\u8def\u5176\u5b9e\u5c31\u662f\u6211\u4eec\u5e73\u65f6\u5728\u751f\u6d3b\u4e2d\u4e60\u60ef\u7684\u601d\u7ef4\u65b9\u5f0f)\uff0c\u6211\u4eec\u77e5\u9053\u9700\u8981\u6709\u4e00\u4e2a\u8ba1\u6570\u5668\u7c7b Counter\uff0c\u6709\u4e00\u4e2a\u5fc5\u987b\u7684\u548c\u4e24\u4e2a\u53ef\u9009\u7684\u65b9\u6cd5\uff1a<\/p>\n
getCount()
\n\/\/ \u53d6\u8ba1\u6570\u5668\u503c\u65b9\u6cd5
\nresetCounter()
\n\/\/ \u8ba1\u6570\u5668\u6e050\u65b9\u6cd5
\nsetCount()
\n\/\/ \u8bbe\u8ba1\u6570\u5668\u4e3a\u76f8\u5e94\u7684\u503c\u65b9\u6cd5<\/p>\n
\u628aCounter\u7c7b\u5b8c\u6574\u7684\u5b9a\u4e49\u5982\u4e0b\uff1a<\/p>\n
[java]public class Counter
\n{
\n public int getCount(int id){}
\n public void resetCounter(int id){}
\n public void setCount(int id, int currentCount) {}
\n}[\/java]<\/p>\n
\u89e3\u51b3\u95ee\u9898\u7684\u6846\u67b6\u5df2\u7ecf\u6709\u4e86\uff0c\u6765\u770b\u4e00\u4e0b\u5982\u4f55\u4f7f\u7528Counter\u3002\u5728count.cgi\u91cc\u9762\u8c03\u7528Counter\u6765\u8ba1\u6570\uff0c\u7a0b\u5e8f\u7247\u65ad\u5982\u4e0b\uff1a <\/p>\n
[java]\/\/ \u8fd9\u91cc\u4eceHTTP\u73af\u5883\u91cc\u9762\u53d6id\u503c
\n…
\nCounter myCounter = new Counter();
\n\/\/ \u83b7\u5f97\u8ba1\u6570\u5668
\nint currentCount = myCounter.getCount(id);
\n\/\/ \u4ece\u8ba1\u6570\u5668\u4e2d\u53d6\u8ba1\u6570
\n\/\/ \u8fd9\u91cc\u5411\u5ba2\u6237\u6d4f\u89c8\u5668\u8f93\u51fa
\n…[\/java]<\/p>\n
\u7a0b\u5e8f\u7684\u6846\u67b6\u5168\u90fd\u5199\u597d\u4e86\uff0c\u5269\u4e0b\u7684\u5c31\u662f\u5b9e\u73b0Counter\u7c7b\u65b9\u6cd5\u91cc\u9762\u5177\u4f53\u7684\u4ee3\u7801\u4e86\uff0c\u6b64\u65f6\u624d\u53bb\u8003\u8651\u5177\u4f53\u7684\u7a0b\u5e8f\u8bed\u8a00\u5b9e\u73b0\u7684\u7ec6\u8282\uff0c\u6bd4\u5982\uff0c\u5728getCount()\u65b9\u6cd5\u91cc\u9762\u8bbf\u95ee\u6570\u636e\u5e93\uff0c\u66f4\u65b0\u8ba1\u6570\u503c\u3002 <\/p>\n
\u4ece\u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d\u770b\u5230\uff0c\u9762\u5411\u5bf9\u8c61\u7684\u601d\u7ef4\u65b9\u6cd5\u5176\u5b9e\u5c31\u662f\u6211\u4eec\u5728\u73b0\u5b9e\u751f\u6d3b\u4e2d\u4e60\u60ef\u7684\u601d\u7ef4\u65b9\u5f0f\uff0c\u662f\u4ece\u4eba\u7c7b\u8003\u8651\u95ee\u9898\u7684\u89d2\u5ea6\u51fa\u53d1\uff0c\u628a\u4eba\u7c7b\u89e3\u51b3\u95ee\u9898\u7684\u601d\u7ef4\u65b9\u5f0f\u9010\u6b65\u7ffb\u8bd1\u6210\u7a0b\u5e8f\u80fd\u591f\u7406\u89e3\u7684\u601d\u7ef4\u65b9\u5f0f\u7684\u8fc7\u7a0b\uff0c\u5728\u8fd9\u4e2a\u7ffb\u8bd1\u7684\u8fc7\u7a0b\u4e2d\uff0c\u8f6f\u4ef6\u4e5f\u5c31\u9010\u6b65\u88ab\u8bbe\u8ba1\u597d\u4e86\u3002 <\/p>\n
\u5728\u8fd0\u7528\u9762\u5411\u5bf9\u8c61\u7684\u601d\u7ef4\u65b9\u6cd5\u8fdb\u884c\u8f6f\u4ef6\u8bbe\u8ba1\u7684\u8fc7\u7a0b\u4e2d\uff0c\u6700\u5bb9\u6613\u72af\u7684\u9519\u8bef\u5c31\u662f\u5f00\u59cb\u5206\u6790\u7684\u65f6\u5019\uff0c\u5c31\u60f3\u5230\u4e86\u7a0b\u5e8f\u4ee3\u7801\u5b9e\u73b0\u7684\u7ec6\u8282\uff0c\u56e0\u6b64\u5c01\u88c5\u7684\u7c7b\u5b8c\u5168\u662f\u57fa\u4e8e\u7a0b\u5e8f\u5b9e\u73b0\u903b\u8f91\uff0c\u800c\u4e0d\u662f\u57fa\u4e8e\u89e3\u51b3\u95ee\u9898\u7684\u4e1a\u52a1\u903b\u8f91\u3002 <\/p>\n
\u5b66\u4e60JDBC\u7f16\u7a0b\u7684\u7ecf\u5178\u9519\u8bef\u95ee\u6cd5\u662f\uff1a\u201c\u6211\u600e\u6837\u5c01\u88c5\u5bf9\u6570\u636e\u5e93\u7684select\u64cd\u4f5c\uff1f\u201d <\/p>\n
\u9762\u5411\u5bf9\u8c61\u7684\u8bbe\u8ba1\u662f\u57fa\u4e8e\u89e3\u51b3\u4e1a\u52a1\u95ee\u9898\u7684\u8bbe\u8ba1\uff0c\u800c\u4e0d\u662f\u57fa\u4e8e\u5177\u4f53\u7f16\u7a0b\u6280\u672f\u7684\u8bbe\u8ba1\u3002\u6211\u4e0d\u4f1a\u53bb\u5c01\u88c5select\u8bed\u53e5\u7684\uff0c\u6211\u53ea\u5c01\u88c5\u89e3\u51b3\u95ee\u9898\u7684\u4e1a\u52a1\u903b\u8f91\uff0c\u5bf9\u6570\u636e\u5e93\u7684\u8bfb\u53d6\u662f\u5728\u4e1a\u52a1\u903b\u8f91\u7684\u7f16\u7801\u5b9e\u73b0\u9636\u6bb5\u624d\u53bb\u8003\u8651\u7684\u95ee\u9898\u3002 <\/p>\n
\u56de\u8fc7\u5934\u770b\u4e0a\u9762\u90a3\u4e2a\u53d1\u5e7f\u544a\u90ae\u4ef6\u7684\u4f8b\u5b50\uff0c\u5e94\u8be5\u5982\u4f55\u5e94\u7528\u9762\u5411\u5bf9\u8c61\u7684\u601d\u7ef4\u65b9\u6cd5\u5462\uff1f <\/p>\n
\u5bf9\u4e8e\u4e00\u4e2a\u90ae\u4ef6\u6765\u8bf4\uff0c\u6709\u90ae\u4ef6\u5934\uff0c\u90ae\u4ef6\u4f53\uff0c\u548c\u90ae\u4ef6\u5730\u5740\u8fd9\u4e09\u4e2a\u5c5e\u6027\uff0c\u53d1\u9001\u90ae\u4ef6\uff0c\u9700\u8981\u4e00\u4e2a\u53d1\u9001\u7684\u65b9\u6cd5\uff0c\u53e6\u5916\u8fd8\u9700\u8981\u4e00\u4e2a\u80fd\u628a\u6240\u6709\u90ae\u4ef6\u5730\u5740\u5217\u51fa\u6765\u7684\u65b9\u6cd5\u3002\u6240\u4ee5\u5e94\u8be5\u5982\u4e0b\u8bbe\u8ba1\uff1a <\/p>\n
\u7c7bJunkMail <\/p>\n
\u5c5e\u6027\uff1a <\/p>\n
head
\nbody
\naddress<\/p>\n
\u65b9\u6cd5\uff1a <\/p>\n
sendMail()
\n\/\/ \u53d1\u9001\u90ae\u4ef6
\nlistAllMail()
\n\/\/ \u5217\u90ae\u4ef6\u5730\u5740<\/p>\n
\u7528Java\u6765\u8868\u793a\uff1a <\/p>\n
[java]public class JunkMail
\n{
\n private String head;
\n private String body;
\n private String address;
\n public JunkMain()
\n {
\n \/\/ \u9ed8\u8ba4\u7684\u7c7b\u6784\u9020\u5668
\n \/\/ \u4ece\u5916\u90e8\u914d\u7f6e\u6587\u4ef6\u8bfb\u90ae\u4ef6\u5934\u548c\u90ae\u4ef6\u4f53
\n this.head=…;
\n this.body=…;
\n}<\/p>\n
public static boolean sendMail(String address)
\n {
\n \/\/ \u8c03\u7528qmail\uff0c\u53d1\u9001email
\n }<\/p>\n
public static Collection listAllMail()
\n {
\n \/\/ \u8bbf\u95ee\u6570\u636e\u5e93\uff0c\u8fd4\u56de\u4e00\u4e2a\u90ae\u4ef6\u5730\u5740\u96c6\u5408
\n }
\n}[\/java]<\/p>\n
\u5f53\u628aJunkMail\u8bbe\u8ba1\u597d\u4e86\u4ee5\u540e\uff0c\u518d\u8c03\u7528JunkMail\u7c7b\u5b8c\u6210\u90ae\u4ef6\u7684\u53d1\u9001\uff0c\u5c06\u662f\u975e\u5e38\u8f7b\u677e\u7684\u4e8b\u60c5\u3002 <\/p>\n
\u5982\u679c\u8bf4\u4f20\u7edf\u7684\u9762\u5411\u8fc7\u7a0b\u7684\u7f16\u7a0b\u662f\u7b26\u5408\u673a\u5668\u8fd0\u884c\u6307\u4ee4\u7684\u6d41\u7a0b\u7684\u8bdd\uff0c\u90a3\u4e48\u9762\u5411\u5bf9\u8c61\u7684\u601d\u7ef4\u65b9\u6cd5\u5c31\u662f\u7b26\u5408\u73b0\u5b9e\u751f\u6d3b\u4e2d\u4eba\u7c7b\u89e3\u51b3\u95ee\u9898\u7684\u601d\u7ef4\u8fc7\u7a0b\u3002 <\/p>\n
\u5728\u9762\u5411\u5bf9\u8c61\u7684\u8f6f\u4ef6\u5206\u6790\u548c\u8bbe\u8ba1\u7684\u65f6\u5019\uff0c\u8981\u63d0\u9192\u81ea\u5df1\uff0c\u4e0d\u8981\u4e00\u4e0a\u6765\u5c31\u53bb\u60f3\u7a0b\u5e8f\u4ee3\u7801\u7684\u5b9e\u73b0\uff0c\u5e94\u8be5\u629b\u5f00\u5177\u4f53\u7f16\u7a0b\u8bed\u8a00\u7684\u675f\u7f1a\uff0c\u96c6\u4e2d\u7cbe\u529b\u5206\u6790\u6211\u4eec\u8981\u5b9e\u73b0\u7684\u8f6f\u4ef6\u7684\u4e1a\u52a1\u903b\u8f91\uff0c\u5206\u6790\u8f6f\u4ef6\u7684\u4e1a\u52a1\u6d41\u7a0b\uff0c\u601d\u8003\u5e94\u8be5\u5982\u4f55\u53bb\u63cf\u8ff0\u548c\u5b9e\u73b0\u8f6f\u4ef6\u7684\u4e1a\u52a1\u3002\u6bd5\u7adf\u8f6f\u4ef6\u53ea\u662f\u4e00\u4e2a\u8f7d\u4f53\uff0c\u4e1a\u52a1\u624d\u662f\u6211\u4eec\u771f\u6b63\u8981\u5b9e\u73b0\u7684\u76ee\u6807\u3002 <\/p>\n
\u4f46\u662f\u5728\u8bbe\u8ba1\u8fc7\u7a0b\u4e2d\uff0c\u5fc3\u91cc\u5374\u5f80\u5f80\u5728\u62c5\u5fc3\uff0c\u5982\u679c\u6211\u5b8c\u5168\u4e0d\u53bb\u8003\u8651\u7a0b\u5e8f\u4ee3\u7801\u7684\u5b9e\u73b0\u7684\u8bdd\uff0c\u90a3\u4e48\u6211\u600e\u4e48\u77e5\u9053\u6211\u7684\u8bbe\u8ba1\u4e00\u5b9a\u5408\u7406\u5462\uff1f\u6211\u600e\u4e48\u77e5\u9053\u6211\u8bbe\u8ba1\u7684\u7c7b\u3001\u63a5\u53e3\u4e00\u5b9a\u53ef\u4ee5\u5b9e\u73b0\u5462\uff1f\u6240\u4ee5\u7ecf\u5e38\u53ef\u4ee5\u770b\u5230\u7684\u73b0\u8c61\u5c31\u662f\uff1a <\/p>\n
\u5728\u8bbe\u8ba1\u8fc7\u7a0b\u4e2d\uff0c\u867d\u7136\u77e5\u9053\u4e0d\u80fd\u8fc7\u65e9\u8003\u8651\u4ee3\u7801\u5b9e\u73b0\uff0c\u4f46\u662f\u6bcf\u8bbe\u8ba1\u4e00\u4e2a\u7c7b\uff0c\u4e00\u4e2a\u63a5\u53e3\uff0c\u5fc3\u91cc\u90fd\u8981\u4e0d\u77e5\u4e0d\u89c9\u7684\u7528\u81ea\u5df1\u719f\u6089\u7684\u7f16\u7a0b\u8bed\u8a00\u5927\u6982\u7684\u8bc4\u4f30\u4e00\u4e0b\uff0c\u770b\u770b\u80fd\u5426\u7f16\u51fa\u6765\uff0c\u56e0\u6b64\uff0c\u4e00\u4e0d\u5c0f\u5fc3\uff0c\u5c31\u4f1a\u53c8\u56de\u5230\u6309\u7167\u7a0b\u5e8f\u529f\u80fd\u5b9e\u73b0\u7684\u601d\u8def\u8fdb\u884c\u8bbe\u8ba1\u7684\u8001\u8def\u4e0a\u53bb\u4e86\u3002 <\/p>\n
\u4e3e\u4e2a\u4f8b\u5b50\u6765\u8bf4\u660e\uff0c\u5728\u505aWeb\u7a0b\u5e8f\u8bbe\u8ba1\u7684\u65f6\u5019\uff0c\u7ecf\u5e38\u8981\u9047\u5230\u5206\u9875\u663e\u793a\u6570\u636e\u7684\u60c5\u51b5\u3002\u6bd4\u5982\u8bf4\u9700\u8981\u628a\u7cfb\u7edf\u4e2d\u6240\u6709\u7684\u7528\u6237\u90fd\u5217\u51fa\u6765\u8fd9\u6837\u7684\u529f\u80fd\u3002\u5047\u8bbe\u4f7f\u7528User\u7c7b\u6765\u8868\u793a\u7528\u6237\uff0c\u589e\u52a0\u7528\u6237addUser()\uff0c\u5220\u9664\u7528\u6237deleteUser()\uff0c\u67e5\u8be2\u6240\u6709\u7528\u6237listUsers()\u65b9\u6cd5\u3002\u800c\u6570\u636e\u5e93\u4e2d\u6709\u4e00\u4e2auser\u8868\uff0c\u4e00\u6761\u8bb0\u5f55\u662f\u4e00\u4e2a\u7528\u6237\u7684\u4fe1\u606f\u3002\u4e0b\u9762\u8003\u8651\u4e00\u4e0bUser\u7c7b\u7684\u65b9\u6cd5\u7684\u5b9e\u73b0\uff1a <\/p>\n
addUser()\u548cdeleteUser()\u65b9\u6cd5\u90fd\u597d\u5b9e\u73b0\uff0c\u5c31\u662f\u5bf9\u6570\u636e\u5e93\u589e\u52a0\u8bb0\u5f55\u548c\u5220\u9664\u8bb0\u5f55\u3002\u5bf9\u4e8elistUsers()\u65b9\u6cd5\uff0c\u5176\u5b9e\u5c31\u662f\u5bf9user\u8868\u7684select\uff0c\u53d6\u51fa\u4e00\u4e2a\u8bb0\u5f55\u96c6\u3002\u4f46\u662f\u8be5\u600e\u4e48\u4ecelistUsers()\u65b9\u6cd5\u4e2d\u5f97\u5230\u6240\u6709\u7528\u6237\u7684\u5217\u8868\u5462\uff1f <\/p>\n
\u4e00\u4e2a\u65b9\u6cd5\u8c03\u7528\u7684\u8fd4\u56de\u503c\u53ea\u6709\u4e00\u4e2a\uff0c\u6ca1\u6709\u591a\u4e2a\uff0c\u6240\u4ee5\u5f88\u591a\u60c5\u51b5\u4e0b\u91c7\u7528\u7684\u529e\u6cd5\u5c31\u662f\u8fd4\u56de\u503c\u5b9a\u4e49\u4e3a\u96c6\u5408\u7c7b\u578b\uff0c\u6bd4\u5982Vector\u3002\u8fd9\u6837\u5c31\u53ef\u4ee5\u5728listUsers()\u65b9\u6cd5\u7684\u5177\u4f53\u4ee3\u7801\u5b9e\u73b0\u7684\u65f6\u5019\uff0c\u4ece\u6570\u636e\u5e93\u4f9d\u6b21\u53d6\u51fa\u4e00\u4e2a\u4e2a\u8bb0\u5f55\uff0c\u63d2\u5165\u5230Vector\u91cc\u9762\u6765\u3002\u5728\u4e3b\u7a0b\u5e8f\u91cc\u9762\uff0c\u8c03\u7528listUsers()\u65b9\u6cd5\u53ef\u4ee5\u8fd4\u56de\u4e00\u4e2aVector\uff0c\u7136\u540e\u518d\u5bf9Vector\u904d\u5386\u64cd\u4f5c\uff0c\u5c31\u53ef\u4ee5\u5f97\u5230\u7528\u6237\u5217\u8868\u4e86\u3002 <\/p>\n
[java]public class User
\n{<\/p>\n
public static void addUser(…)
\n {
\n \/\/ \u6570\u636e\u5e93insert\u4e00\u6761\u8bb0\u5f55
\n }<\/p>\n
public static void deleteUser(…)
\n {
\n \/\/ \u6570\u636e\u5e93delete\u4e00\u6761\u8bb0\u5f55
\n }<\/p>\n
public Vector listUsers(…)
\n {
\n \/\/ \u6570\u636e\u5e93select\u7ed3\u679c\u653e\u5230\u4e00\u4e2a\u96c6\u5408\u91cc\u9762
\n }
\n}
\n [\/java]<\/p>\n
\u8fd9\u6837\u7684\u8bbe\u8ba1\u57fa\u672c\u5408\u7406\uff0c\u4f46\u662f\u4ecd\u7136\u6709\u70b9\u5c0f\u95ee\u9898\u3002\u56e0\u4e3a\u5728\u8bbe\u8ba1\u7684\u65f6\u5019\uff0c\u5c31\u8003\u8651\u5230\u4e86\u7528Java\u7684\u96c6\u5408\u7c7bVector\u6765\u5b9e\u73b0\u5bf9\u4e0d\u5b9a\u957f\u6570\u636e\u96c6\u7684\u5b58\u653e\uff0c\u56e0\u800c\u8fdd\u53cd\u4e86\u9762\u5411\u5bf9\u8c61\u8bbe\u8ba1\u7684\u4e00\u4e2a\u539f\u5219\uff1a\u5728\u8bbe\u8ba1\u7684\u65f6\u5019\u4e0d\u5e94\u8fc7\u65e9\u7684\u8003\u8651\u5177\u4f53\u7a0b\u5e8f\u8bed\u8a00\u7684\u5b9e\u73b0\u3002\u6240\u4ee5\u5fc5\u987b\u7528\u62bd\u8c61\u7684\u65b9\u6cd5\uff0c\u548c\u5177\u4f53\u5b9e\u73b0\u65e0\u5173\u7684\u65b9\u6cd5\u6765\u8868\u8fbe\u4e1a\u52a1\u903b\u8f91\u3002 <\/p>\n
\u6211\u4eec\u77e5\u9053\uff0c\u901a\u5e38\u5bf9\u5177\u6709\u96c6\u5408\u7279\u5f81\u7684\u6570\u636e\u7ed3\u6784\u8fdb\u884c\u904d\u5386\u901a\u5e38\u53ef\u4ee5\u4f7f\u7528next\u548chasNext\u65b9\u6cd5\uff0cnext\u5b9e\u73b0\u53d6\u4e0b\u4e00\u4e2a\u7528\u6237\uff0chasNext\u5224\u65ad\u662f\u5426\u8fd8\u6709\u5143\u7d20\u3002 \u56e0\u6b64\u6211\u4eec\u5b9a\u4e49\u4e00\u4e2a\u63a5\u53e3Iterator\uff0c\u8fd9\u4e2a\u63a5\u53e3\u4e2d\u5b9a\u4e49\u4e24\u4e2a\u65b9\u6cd5next\u548chasNext\uff1a <\/p>\n
[java]public interface Iterator
\n{
\n public boolean hasNext(){}
\n public Object next() {}
\n}<\/p>\n
\u800cUser\u7c7b\u7684listUses\u65b9\u6cd5\u8fd4\u56de\u503c
\n\u6539\u4e3aIterator\u63a5\u53e3\u7684\u5b9e\u73b0\u7c7b:<\/p>\n
public class User
\n{
\n …
\n public Iterator listUsers(){}
\n …
\n}[\/java]<\/p>\n
\u8fd9\u6837\u5c31\u628aUser\u7c7b\u7684\u8bbe\u8ba1\u548c\u5177\u4f53\u7684\u5b9e\u73b0\u65b9\u6cd5\u5206\u79bb\u5f00\u4e86\uff0c\u56e0\u4e3a\u6b64\u65f6\u4efb\u4f55\u5b9e\u73b0\u4e86next()\u548chasNext()\u65b9\u6cd5\u7684\u7c7b\u90fd\u53ef\u4ee5\u505a\u4e3alistUsers\u7684\u8fd4\u56de\u503c\uff0c\u90fd\u53ef\u4ee5\u88ab\u7528\u6765\u8868\u8fbe\u201c\u7528\u6237\u5217\u8868\u201d\uff0c\u800c\u4e0d\u4ec5\u4ec5\u53ef\u4ee5\u4f7f\u7528Vector\u800c\u5df2\u3002 <\/p>\n
\u6bd4\u5982\uff0c\u6211\u53ef\u4ee5\u7528ArrayList\u6765\u8868\u8fbe\u7528\u6237\u5217\u8868\uff0c\u56e0\u4e3aArrayList\u4e5f\u5b9e\u73b0\u4e86Iterator\uff0c\u5f53\u7136\u6211\u4e5f\u53ef\u4ee5\u81ea\u5df1\u4e13\u95e8\u5199\u4e00\u4e2a\u7c7b\u6765\u5b58\u653e\u7528\u6237\u5217\u8868\uff0c\u53ea\u8981\u5b9e\u73b0next()\u548chasNext()\u65b9\u6cd5\u5c31\u884c\u4e86\u3002 <\/p>\n
\u8fd9\u6837\u5728\u5177\u4f53\u7684\u7f16\u5199\u4ee3\u7801\u7684\u65f6\u5019\uff0c\u7a0b\u5e8f\u5458\u5177\u6709\u4e86\u6700\u5927\u7684\u7075\u6d3b\u6027\uff0c\u53ef\u4ee5\u6839\u636e\u5177\u4f53\u7684\u60c5\u51b5\uff0c\u91c7\u7528\u4e0d\u540c\u7684\u7f16\u7a0b\u65b9\u6cd5\u6765\u5b58\u653e\u7528\u6237\u5217\u8868\u3002\u7279\u522b\u662f\u964d\u4f4e\u4e86\u7a0b\u5e8f\u7684\u8026\u5408\u5ea6\uff0c\u63d0\u9ad8\u4e86\u7a0b\u5e8f\u7684\u53ef\u79fb\u690d\u6027\u3002\u5bf9\u4e8e\u4e0a\u9762\u90a3\u4e2aJunkMail\u7684listAllMail()\u65b9\u6cd5\u4e5f\u540c\u6837\u5e94\u8be5\u6539\u4e3a\u63a5\u53e3\u7c7b\u578b\u3002 <\/p>\n
\u7136\u540e\uff0c\u5728\u4e3b\u7a0b\u5e8f\u91cc\u9762\u5c31\u8fd9\u6837\u6765\u4f7f\u7528User\u7c7b\u7684listUsers\u65b9\u6cd5\uff1a <\/p>\n
[java]User myUser = new User();
\nIterator iterator = myUser.listUsers();
\nwhile (iterator.hasNext())
\n{
\n iterator.next();
\n}[\/java]<\/p>\n
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