使用注解后报空指针异常，找不到错误

配置如下

```java
public class ConnectionConfUtil {

    public String POSTGRESQL_SYS_CONNECTION;
    public String POSTGRESQL_SYS_USER;
    public String POSTGRESQL_SYS_PASSWORD;
    public String JASYPT_ENCRYPTOR_PASSWORD;

    @Value("${spring.postgresql_sys_connection}")
    public void setPostgresqlSysConnection(String postgresqlSysConnection) {
        POSTGRESQL_SYS_CONNECTION = postgresqlSysConnection;
    }

    @Value("${spring.postgresql_sys_user}")
    public void setPostgresqlSysUser(String postgresqlSysUser) {
        POSTGRESQL_SYS_USER = postgresqlSysUser;
    }

    @Value("${spring.postgresql_sys_password}")
    public void setPostgresqlSysPassword(String postgresqlSysPassword) {
        POSTGRESQL_SYS_PASSWORD = postgresqlSysPassword;
    }

    @Value("${spring.ad_pwd_encryption_key}")
    public void setJasyptEncryptorPassword(String jasyptEncryptorPassword) {
        JASYPT_ENCRYPTOR_PASSWORD = jasyptEncryptorPassword;
    }

}

在方法中报空指针异常

private void initPostgreSQLDataSet() {
            ods = new PGSimpleDataSource();
            ods.setUrl(connectionConfUtil.getPOSTGRESQL_SYS_CONNECTION());
            ods.setUser(connectionConfUtil.getPOSTGRESQL_SYS_USER());
            ods.setPassword(connectionConfUtil.getPOSTGRESQL_SYS_PASSWORD());
            ods.setDefaultRowFetchSize(100);
            ods.setConnectTimeout(60000);

    }

```

配置类要交给Spring去管理

ConnectionConfUtil 构建成一个bean