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| ThreadLocal Java • gao6rich • 2022-12-14 10:09:36 AM • 最后回复来自 byte10 | 13 |
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326 天前 回复了 ffyyhh 创建的主题 › MacBook › 买 macbook air 好还是 pro 好 |
内存大的 air 吧
2022-12-12 19:17:59 +08:00 回复了 gao6rich 创建的主题 › Java › ThreadLocal |
class ConnectionManager {
private Connection connect = null;
public Connection openConnection() {
if (connect == null) {
connect = DriverManager.getConnection();
}
return connect;
}
public void closeConnection() {
if (connect != null)
connect.close();
}
}
class Dao {
public void insert() {
ConnectionManager connectionManager = new ConnectionManager();
Connection connection = connectionManager.openConnection();
// 使用 connection 进行操作
connectionManager.closeConnection();
}
}
===========================================使用 ThreadLocal
public class ConnectionManager {
private static final ThreadLocal<Connection> dbConnectionLocal = new ThreadLocal<Connection>() {
@Override
protected Connection initialValue() {
try {
return DriverManager.getConnection("", "", "");
} catch (SQLException e) {
e.printStackTrace();
}
return null;
}
};
public Connection getConnection() {
return dbConnectionLocal.get();
}
}
===========================================不使用 ThreadLocal
这两者有什么区别呢
private Connection connect = null;
public Connection openConnection() {
if (connect == null) {
connect = DriverManager.getConnection();
}
return connect;
}
public void closeConnection() {
if (connect != null)
connect.close();
}
}
class Dao {
public void insert() {
ConnectionManager connectionManager = new ConnectionManager();
Connection connection = connectionManager.openConnection();
// 使用 connection 进行操作
connectionManager.closeConnection();
}
}
===========================================使用 ThreadLocal
public class ConnectionManager {
private static final ThreadLocal<Connection> dbConnectionLocal = new ThreadLocal<Connection>() {
@Override
protected Connection initialValue() {
try {
return DriverManager.getConnection("", "", "");
} catch (SQLException e) {
e.printStackTrace();
}
return null;
}
};
public Connection getConnection() {
return dbConnectionLocal.get();
}
}
===========================================不使用 ThreadLocal
这两者有什么区别呢
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