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

@Componentpublic 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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