{"id":180686,"date":"2024-11-09T12:20:17","date_gmt":"2024-11-09T04:20:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/180686\/"},"modified":"2024-11-09T12:20:18","modified_gmt":"2024-11-09T04:20:18","slug":"%e6%b7%b1%e5%85%a5%e4%ba%86%e8%a7%a3java%e9%ab%98%e4%b8%a6%e7%99%bc%e4%bb%a5%e5%8f%8a%e6%95%b8%e6%93%9a%e5%ba%ab%e9%8e%96%e7%9a%84%e4%bd%bf%e7%94%a8%e6%96%b9%e6%b3%95-java-%e9%ab%98%e4%b8%a6%e7%99%bc","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/180686\/","title":{"rendered":"\u6df1\u5165\u4e86\u89e3Java\u9ad8\u4e26\u767c\u4ee5\u53ca\u6578\u64da\u5eab\u9396\u7684\u4f7f\u7528\u65b9\u6cd5 (java \u9ad8\u4e26\u767c \u6578\u64da\u5eab\u9396)"},"content":{"rendered":"

\u6df1\u5165\u4e86\u89e3Java\u9ad8\u4e26\u767c\u4ee5\u53ca\u6578\u64da\u5eab\u9396\u7684\u4f7f\u7528\u65b9\u6cd5<\/h1>\n

\u5728\u7576\u4eca\u7684\u8edf\u9ad4\u958b\u767c\u4e2d\uff0c\u9ad8\u4e26\u767c\u8655\u7406\u5df2\u6210\u70ba\u4e00\u500b\u91cd\u8981\u7684\u8ab2\u984c\u3002\u96a8\u8457\u4e92\u806f\u7db2\u61c9\u7528\u7684\u666e\u53ca\uff0c\u5982\u4f55\u6709\u6548\u5730\u8655\u7406\u5927\u91cf\u7684\u8acb\u6c42\u6210\u70ba\u4e86\u958b\u767c\u8005\u5fc5\u9808\u9762\u5c0d\u7684\u6311\u6230\u3002Java\u4f5c\u70ba\u4e00\u7a2e\u5ee3\u6cdb\u4f7f\u7528\u7684\u7de8\u7a0b\u8a9e\u8a00\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u5de5\u5177\u548c\u6280\u8853\u4f86\u652f\u6301\u9ad8\u4e26\u767c\u7684\u5be6\u73fe\u3002\u5728\u9019\u7bc7\u6587\u7ae0\u4e2d\uff0c\u6211\u5011\u5c07\u6df1\u5165\u63a2\u8a0eJava\u9ad8\u4e26\u767c\u7684\u6982\u5ff5\u4ee5\u53ca\u6578\u64da\u5eab\u9396\u7684\u4f7f\u7528\u65b9\u6cd5\u3002<\/p>\n

Java\u9ad8\u4e26\u767c\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n

\u9ad8\u4e26\u767c\u6307\u7684\u662f\u7cfb\u7d71\u80fd\u5920\u540c\u6642\u8655\u7406\u5927\u91cf\u7684\u8acb\u6c42\u3002Java\u63d0\u4f9b\u4e86\u591a\u7dda\u7a0b\u7684\u652f\u6301\uff0c\u4f7f\u5f97\u958b\u767c\u8005\u53ef\u4ee5\u8f15\u9b06\u5730\u5275\u5efa\u591a\u500b\u57f7\u884c\u7dd2\u4f86\u8655\u7406\u4e0d\u540c\u7684\u4efb\u52d9\u3002Java\u7684\u57f7\u884c\u7dd2\u6a21\u578b\u57fa\u65bc\u64cd\u4f5c\u7cfb\u7d71\u7684\u57f7\u884c\u7dd2\uff0c\u9019\u610f\u5473\u8457Java\u7684\u57f7\u884c\u7dd2\u662f\u8f15\u91cf\u7d1a\u7684\uff0c\u80fd\u5920\u6709\u6548\u5730\u5229\u7528\u7cfb\u7d71\u8cc7\u6e90\u3002<\/p>\n

Java\u4e2d\u7684\u57f7\u884c\u7dd2\u7ba1\u7406<\/h3>\n

\u5728Java\u4e2d\uff0c\u57f7\u884c\u7dd2\u7684\u5275\u5efa\u53ef\u4ee5\u901a\u904e\u7e7c\u627fThread\u985e\u6216\u5be6\u73feRunnable\u63a5\u53e3\u4f86\u5be6\u73fe\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u7bc4\u4f8b\uff1a<\/p>\n

class MyThread extends Thread {\n    public void run() {\n        System.out.println(\"\u57f7\u884c\u7dd2 \" + Thread.currentThread().getName() + \" \u6b63\u5728\u904b\u884c\");\n    }\n}\n\npublic class Main {\n    public static void main(String[] args) {\n        MyThread thread1 = new MyThread();\n        MyThread thread2 = new MyThread();\n        thread1.start();\n        thread2.start();\n    }\n}\n<\/code><\/pre>\n
\u5728\u9019\u500b\u7bc4\u4f8b\u4e2d\uff0c\u6211\u5011\u5275\u5efa\u4e86\u5169\u500b\u57f7\u884c\u7dd2\u4e26\u555f\u52d5\u5b83\u5011\u3002\u9019\u6a23\u53ef\u4ee5\u540c\u6642\u57f7\u884c\u591a\u500b\u4efb\u52d9\uff0c\u5f9e\u800c\u63d0\u9ad8\u7cfb\u7d71\u7684\u4e26\u767c\u8655\u7406\u80fd\u529b\u3002<\/p>\n
\u6578\u64da\u5eab\u9396\u7684\u4f7f\u7528\u65b9\u6cd5<\/h2>\n
\u5728\u9ad8\u4e26\u767c\u74b0\u5883\u4e2d\uff0c\u6578\u64da\u5eab\u7684\u8a2a\u554f\u5f80\u5f80\u6703\u6210\u70ba\u74f6\u9838\u3002\u70ba\u4e86\u4fdd\u8b77\u6578\u64da\u7684\u4e00\u81f4\u6027\u548c\u5b8c\u6574\u6027\uff0c\u6578\u64da\u5eab\u4f7f\u7528\u9396\u4f86\u63a7\u5236\u5c0d\u6578\u64da\u7684\u8a2a\u554f\u3002Java\u4e2d\u5e38\u7528\u7684\u6578\u64da\u5eab\u9396\u6709\u5169\u7a2e\uff1a\u60b2\u89c0\u9396\u548c\u6a02\u89c0\u9396\u3002<\/p>\n
\u60b2\u89c0\u9396<\/h3>\n
\u60b2\u89c0\u9396\u5047\u8a2d\u5728\u4efb\u4f55\u6642\u5019\u90fd\u6703\u6709\u885d\u7a81\uff0c\u56e0\u6b64\u5728\u8a2a\u554f\u6578\u64da\u4e4b\u524d\u6703\u5148\u52a0\u9396\u3002\u9019\u7a2e\u65b9\u5f0f\u96d6\u7136\u80fd\u5920\u4fdd\u8b49\u6578\u64da\u7684\u4e00\u81f4\u6027\uff0c\u4f46\u6703\u5f71\u97ff\u7cfb\u7d71\u7684\u6027\u80fd\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528\u60b2\u89c0\u9396\u7684\u7bc4\u4f8b\uff1a<\/p>\n
Connection conn = DriverManager.getConnection(\"jdbc:mysql:\/\/localhost:3306\/mydb\", \"user\", \"password\");\nconn.setAutoCommit(false);\nPreparedStatement pstmt = conn.prepareStatement(\"SELECT * FROM users WHERE id = ? FOR UPDATE\");\npstmt.setInt(1, 1);\nResultSet rs = pstmt.executeQuery();\n\/\/ \u8655\u7406\u6578\u64da\nconn.commit();\n<\/code><\/pre>\n
\u6a02\u89c0\u9396<\/h3>\n
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Connection conn = DriverManager.getConnection(\"jdbc:mysql:\/\/localhost:3306\/mydb\", \"user\", \"password\");\nconn.setAutoCommit(false);\nPreparedStatement pstmt = conn.prepareStatement(\"SELECT version FROM users WHERE id = ?\");\npstmt.setInt(1, 1);\nResultSet rs = pstmt.executeQuery();\nint version = rs.getInt(\"version\");\n\/\/ \u66f4\u65b0\u6578\u64da\nPreparedStatement updatePstmt = conn.prepareStatement(\"UPDATE users SET name = ?, version = version + 1 WHERE id = ? AND version = ?\");\nupdatePstmt.setString(1, \"newName\");\nupdatePstmt.setInt(2, 1);\nupdatePstmt.setInt(3, version);\nint rowsAffected = updatePstmt.executeUpdate();\nif (rowsAffected == 0) {\n    \/\/ \u8655\u7406\u885d\u7a81\n}\nconn.commit();\n<\/code><\/pre>\n
\u7d50\u8ad6<\/h2>\n
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