springboot 使用yml配置文件给静态变量赋值教程

    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;
     }
     
    }

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