springboot 使用yml配置文件给静态变量赋值

声明：

此处需求是修改封装的clickhouseUtil数据查询引擎连接工具类。由于此类中的方法都是静态方法。连接地址等参数需要根据不同环境改变。例如开发下地址，测试下地址，生产地址等，所有通过配置文件来获取不同环境下的配置参数，但是使用的方法是静态的，所有不能使用一般情况下的@value直接给变量赋值，需要用到spring 属性的set方法来给静态变量赋值，然后静态方法使用静态变量即可

方法：

第一步：在yml文件中配置需要的参数

clickhouse:
  address: jdbc:clickhouse://172.20.xxx.xxx:8123
  username: default
  password: xxxxx
  db: marketing
  socketTimeout: 600000

第二步：

类上一定要先注明@Component注解，在程序启动是自动加载，否则静态参数仍旧获取不到配置文件的值

创建静态变量

给静态变量set方法上添加@Value()

 @Value("${clickhouse.address}")
    public  void setClickhouseAddress(String address) {
        ClickHouseUtil.clickhouseAddress = address;
    }

最后在静态方法中使用即可

@Component
public class ClickHouseUtil {

    private static String clickhouseAddress;

    private static String clickhouseUsername;

    private static String clickhousePassword;

    private static String clickhouseDB;

    private static Integer clickhouseSocketTimeout;

    @Value("${clickhouse.address}")
    public  void setClickhouseAddress(String address) {
        ClickHouseUtil.clickhouseAddress = address;
    }
    @Value("${clickhouse.username}")
    public  void setClickhouseUsername(String username) {
        ClickHouseUtil.clickhouseUsername = username;
    }
    @Value("${clickhouse.password}")
    public  void setClickhousePassword(String password) {
        ClickHouseUtil.clickhousePassword = password;
    }
    @Value("${clickhouse.db}")
    public  void setClickhouseDB(String db) {
        ClickHouseUtil.clickhouseDB = db;
    }
    @Value("${clickhouse.socketTimeout}")
    public  void setClickhouseSocketTimeout(Integer socketTimeout) {
        ClickHouseUtil.clickhouseSocketTimeout = socketTimeout;
    }


    public static Connection getConn() {

        ClickHouseConnection conn = null;
        ClickHouseProperties properties = new ClickHouseProperties();
        properties.setUser(clickhouseUsername);
        properties.setPassword(clickhousePassword);
        properties.setDatabase(clickhouseDB);
        properties.setSocketTimeout(clickhouseSocketTimeout);
        ClickHouseDataSource clickHouseDataSource = new ClickHouseDataSource(clickhouseAddress,properties);
        try {
            conn = clickHouseDataSource.getConnection();
            return conn;
        } catch (SQLException e) {
            e.printStackTrace();
        }

        return null;
    }

    public static List<JSONObject> exeSql(String sql){
        log.info("cliockhouse 执行sql：" + sql);
        Connection connection = getConn();
        try {
            Statement statement = connection.createStatement();
            ResultSet results = statement.executeQuery(sql);
            ResultSetMetaData rsmd = results.getMetaData();
            List<JSONObject> list = new ArrayList();
            while(results.next()){
                JSONObject row = new JSONObject();
                for(int i = 1;i<=rsmd.getColumnCount();i++){
                    row.put(rsmd.getColumnName(i),results.getString(rsmd.getColumnName(i)));
                }
                list.add(row);
            }

            return list;
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return null;
    }

}

感谢观看！