Java Bean没有在Spring中初始化

我有一个类正在创建数据并将其插入表中。请在下面查找我的代码：

DBConnection类：

import java.sql.Connection;
import java.sql.DriverManager;

public class DBConnection {
    public static Connection getDBConnection() {
        String url = "jdbc:mysql://localhost:3306/";
        String dbName = "expenseCalc";
        String driver = "com.mysql.jdbc.Driver";
        String userName = "*********";
        String password = "*******";
        Connection conn = null;
        try {
            Class.forName(driver).newInstance();
            conn = (Connection) DriverManager.getConnection(url + dbName, userName, password);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return conn;
    }
}

SpringConfig.class

    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;

    @Configuration
    public class SpringConfig {
        @Bean("sqloperations")
        public SQLOperationJavaConfig sqLoperationJavaConfig() {
            DBConnection dbConnection=new AppJavaConfig<DBConnection>().getbean("dbconnection"); 
            return new SQLOperationJavaConfig(dbConnection);
        }
        @Bean("dbconnection")
        public DBConnection dbConnection() {
            return new DBConnection();
        }
    }

SQLOperationJavaConfig.class

public class SQLOperationJavaConfig {
    private DBConnection dbConnection;
    public SQLOperationJavaConfig(DBConnection dbConnection) {
        this.dbConnection=dbConnection;
    }
    private Connection conn;
    public void createTable() throws SQLException {
        conn = dbConnection.getDBConnection();
        String sql="drop table if exists dummy";
        String sql1 = "create table dummy (id int,name varchar(20))";
        Statement statement = conn.createStatement();
        statement.execute(sql);
        statement.execute(sql1);
        System.out.println("Table Created!!");
    }

    public void insertData() throws SQLException {
        conn = dbConnection.getDBConnection();
        String sql = "insert into dummy values(12,'Sunny')";
        Statement statement = conn.createStatement();
        statement.execute(sql);
        System.out.println("Record Inserted!!");
    }
}

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getBean方法没有返回“dbconnection”Bean。

您不需要此getBean方法。。只需将SQLOperationsJavaConfig的初始值设定项更改为以下值：

return new SQLOperationJavaConfig(dbConnection());

---

Spring将查看已经为DBConnection创建的bean，您不需要这个getBean方法。只需将SQLOperationsJavaConfig的初始值设定项更改为以下内容：

return new SQLOperationJavaConfig(dbConnection());

---

Spring将查看已经为DBConnection创建的bean

使用@autowired

@autowired
private DBConnection dbConnection;

---

因为@Autowired注释可以用于在setter方法上自动连接bean，就像@Required注释、构造函数、具有任意名称和/或多个参数的属性或方法一样。

使用@Autowired

@autowired
private DBConnection dbConnection;

---

因为@Autowired注释可以用于在setter方法上自动连接bean，就像@Required注释、构造函数、具有任意名称和/或多个参数的属性或方法一样。

我只想使用JavaConfig，不想使用自动连接。。因此，我不使用@autowired注释。我只想使用JavaConfig，不使用autowired。。因此，我没有使用@autowired注释。