{"id":173577,"date":"2024-11-07T19:11:22","date_gmt":"2024-11-07T11:11:22","guid":{"rendered":"https:\/\/server.hk\/cnblog\/173577\/"},"modified":"2024-11-07T19:11:23","modified_gmt":"2024-11-07T11:11:23","slug":"%e5%a6%82%e4%bd%95%e5%bb%ba%e7%ab%8bjsp%e6%93%8d%e4%bd%9c%e7%94%a8%e4%bb%a5%e6%8f%90%e9%ab%98%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a8%aa%e5%95%8f%e6%95%88%e7%8e%87","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/173577\/","title":{"rendered":"\u5982\u4f55\u5efa\u7acbJSP\u64cd\u4f5c\u7528\u4ee5\u63d0\u9ad8\u6578\u64da\u5eab\u8a2a\u554f\u6548\u7387"},"content":{"rendered":"

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\u5728\u7576\u4eca\u7684\u7db2\u7d61\u61c9\u7528\u4e2d\uff0c\u6578\u64da\u5eab\u7684\u8a2a\u554f\u6548\u7387\u5c0d\u65bc\u6574\u9ad4\u6027\u80fd\u81f3\u95dc\u91cd\u8981\u3002JavaServer Pages\uff08JSP\uff09\u4f5c\u70ba\u4e00\u7a2e\u52d5\u614b\u7db2\u9801\u6280\u8853\uff0c\u80fd\u5920\u6709\u6548\u5730\u8207\u6578\u64da\u5eab\u9032\u884c\u4ea4\u4e92\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u901a\u904e\u512a\u5316JSP\u64cd\u4f5c\u4f86\u63d0\u9ad8\u6578\u64da\u5eab\u7684\u8a2a\u554f\u6548\u7387\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u793a\u4f8b\u548c\u5efa\u8b70\u3002<\/p>\n

\u7406\u89e3JSP\u8207\u6578\u64da\u5eab\u7684\u95dc\u4fc2<\/h2>\n

JSP\u662f\u4e00\u7a2e\u57fa\u65bcJava\u7684\u6280\u8853\uff0c\u5141\u8a31\u958b\u767c\u8005\u5728HTML\u9801\u9762\u4e2d\u5d4c\u5165Java\u4ee3\u78bc\u3002\u7576\u7528\u6236\u8acb\u6c42\u4e00\u500bJSP\u9801\u9762\u6642\uff0c\u4f3a\u670d\u5668\u6703\u5c07\u5176\u8f49\u63db\u70ba\u4e00\u500bServlet\uff0c\u7136\u5f8c\u57f7\u884c\u5176\u4e2d\u7684Java\u4ee3\u78bc\u3002\u9019\u4f7f\u5f97JSP\u80fd\u5920\u8f15\u9b06\u5730\u8207\u6578\u64da\u5eab\u9032\u884c\u4ea4\u4e92\uff0c\u5f9e\u800c\u52d5\u614b\u751f\u6210\u5167\u5bb9\u3002<\/p>\n

\u63d0\u9ad8\u6578\u64da\u5eab\u8a2a\u554f\u6548\u7387\u7684\u7b56\u7565<\/h2>\n

1. \u4f7f\u7528\u9023\u63a5\u6c60<\/h3>\n

\u6bcf\u6b21\u8a2a\u554f\u6578\u64da\u5eab\u6642\uff0c\u5efa\u7acb\u548c\u95dc\u9589\u9023\u63a5\u90fd\u662f\u4e00\u500b\u8017\u6642\u7684\u904e\u7a0b\u3002\u4f7f\u7528\u9023\u63a5\u6c60\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u6027\u80fd\u3002\u9023\u63a5\u6c60\u6703\u9810\u5148\u5efa\u7acb\u4e00\u5b9a\u6578\u91cf\u7684\u6578\u64da\u5eab\u9023\u63a5\uff0c\u4e26\u5728\u9700\u8981\u6642\u91cd\u8907\u4f7f\u7528\u9019\u4e9b\u9023\u63a5\u3002\u9019\u6a23\u53ef\u4ee5\u6e1b\u5c11\u9023\u63a5\u7684\u5efa\u7acb\u6642\u9593\u3002<\/p>\n

\nimport javax.naming.InitialContext;\nimport javax.naming.NamingException;\nimport javax.sql.DataSource;\nimport java.sql.Connection;\n\npublic class DatabaseUtil {\n    private static DataSource dataSource;\n\n    static {\n        try {\n            InitialContext ctx = new InitialContext();\n            dataSource = (DataSource) ctx.lookup(\"java:comp\/env\/jdbc\/MyDataSource\");\n        } catch (NamingException e) {\n            e.printStackTrace();\n        }\n    }\n\n    public static Connection getConnection() throws SQLException {\n        return dataSource.getConnection();\n    }\n}\n<\/code><\/pre>\n
2. \u4f7f\u7528PreparedStatement<\/h3>\n
\u4f7f\u7528PreparedStatement\u800c\u4e0d\u662fStatement\u53ef\u4ee5\u63d0\u9ad8\u6027\u80fd\uff0c\u56e0\u70baPreparedStatement\u6703\u5728\u7b2c\u4e00\u6b21\u57f7\u884c\u6642\u7de8\u8b6fSQL\u8a9e\u53e5\uff0c\u4e26\u5728\u5f8c\u7e8c\u57f7\u884c\u6642\u91cd\u8907\u4f7f\u7528\u9019\u500b\u7de8\u8b6f\u904e\u7684\u8a9e\u53e5\u3002\u9019\u4e0d\u50c5\u63d0\u9ad8\u4e86\u57f7\u884c\u6548\u7387\uff0c\u9084\u80fd\u9632\u6b62SQL\u6ce8\u5165\u653b\u64ca\u3002<\/p>\n
\nimport java.sql.Connection;\nimport java.sql.PreparedStatement;\nimport java.sql.ResultSet;\n\npublic class UserDAO {\n    public User getUserById(int id) {\n        User user = null;\n        String sql = \"SELECT * FROM users WHERE id = ?\";\n        \n        try (Connection conn = DatabaseUtil.getConnection();\n             PreparedStatement pstmt = conn.prepareStatement(sql)) {\n            pstmt.setInt(1, id);\n            ResultSet rs = pstmt.executeQuery();\n            if (rs.next()) {\n                user = new User(rs.getInt(\"id\"), rs.getString(\"name\"));\n            }\n        } catch (SQLException e) {\n            e.printStackTrace();\n        }\n        return user;\n    }\n}\n<\/code><\/pre>\n
3. \u6279\u91cf\u8655\u7406\u6578\u64da<\/h3>\n
\u5728\u9700\u8981\u63d2\u5165\u6216\u66f4\u65b0\u5927\u91cf\u6578\u64da\u6642\uff0c\u4f7f\u7528\u6279\u91cf\u8655\u7406\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u6027\u80fd\u3002\u901a\u904e\u5c07\u591a\u500bSQL\u8a9e\u53e5\u5408\u4f75\u70ba\u4e00\u500b\u6279\u6b21\u4f86\u57f7\u884c\uff0c\u53ef\u4ee5\u6e1b\u5c11\u8207\u6578\u64da\u5eab\u7684\u4ea4\u4e92\u6b21\u6578\u3002<\/p>\n
\npublic void batchInsertUsers(List users) {\n    String sql = \"INSERT INTO users (name) VALUES (?)\";\n    \n    try (Connection conn = DatabaseUtil.getConnection();\n         PreparedStatement pstmt = conn.prepareStatement(sql)) {\n        for (User user : users) {\n            pstmt.setString(1, user.getName());\n            pstmt.addBatch();\n        }\n        pstmt.executeBatch();\n    } catch (SQLException e) {\n        e.printStackTrace();\n    }\n}\n<\/code><\/pre>\n
4. \u512a\u5316\u67e5\u8a62\u8a9e\u53e5<\/h3>\n
\u67e5\u8a62\u8a9e\u53e5\u7684\u512a\u5316\u5c0d\u65bc\u63d0\u9ad8\u6578\u64da\u5eab\u8a2a\u554f\u6548\u7387\u81f3\u95dc\u91cd\u8981\u3002\u4f7f\u7528\u7d22\u5f15\u53ef\u4ee5\u52a0\u5feb\u67e5\u8a62\u901f\u5ea6\uff0c\u4e26\u4e14\u61c9\u907f\u514d\u4f7f\u7528SELECT *\uff0c\u800c\u662f\u9078\u64c7\u9700\u8981\u7684\u5217\u3002<\/p>\n
\npublic List getAllUsers() {\n    List userList = new ArrayList();\n    String sql = \"SELECT id, name FROM users\";\n    \n    try (Connection conn = DatabaseUtil.getConnection();\n         PreparedStatement pstmt = conn.prepareStatement(sql);\n         ResultSet rs = pstmt.executeQuery()) {\n        while (rs.next()) {\n            userList.add(new User(rs.getInt(\"id\"), rs.getString(\"name\")));\n        }\n    } catch (SQLException e) {\n        e.printStackTrace();\n    }\n    return userList;\n}\n<\/code><\/pre>\n
\u7e3d\u7d50<\/h2>\n
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