java获取数据库数据保存到本地txt文件中

首先是Services

@Service
public class logServiceimpl implements logService {


    @Autowired
    @Qualifier("primaryJdbcTemplate")
    protected JdbcTemplate jdbcTemplate;


    @Override
    public List getlog() {


        String sql="show OPEN TABLES where In_use > 0;";

        List>  list= jdbcTemplate.queryForList(sql);

        JSonArray jsonArray = new JSonArray();

        jsonArray.addAll(list);

        List lockLogList = jsonArray.toJavaList(lockLog.class);

        return  lockLogList;
    }



}

然后是Controller

@Component
public class runCron {



    @Resource
    private logService logservice;

    @Value("${dir}")
    private String dir;

    @Scheduled(cron="0 0/1 * * * ?")   //每一分钟执行一次
    public void  getlog() throws IOException {


        List mapList = logservice.getlog();



        File file = new File(dir);


        if (!file.exists()) {

            file.createNewFile();

        }


        //true 禁止覆盖之前的数据
        FileWriter fileWriter=new FileWriter(file,true);

        PrintWriter fout = new PrintWriter(fileWriter);

        SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd  HH:mm:ss");
        Date date = new Date(System.currentTimeMillis());


        fout.write(formatter.format(date));
        String huanhang = System.getProperty("line.separator");
        fout.write(huanhang);

        for (int i = 0; i < mapList.size(); i++) {

            lockLog sql = (lockLog) mapList.get(i);

            String content = sql.getDatabase() + "t" + sql.getTable() + "t" + sql.getIn_use() + "t" + sql.getName_locked();

            fout.write(content);

            huanhang = System.getProperty("line.separator");
            fout.write(huanhang);


        }

        fout.flush();
        fout.close();
    }

}

最后是配置文件application.properties

dir=D:\aaa.txt

spring.datasource.primary.jdbc-url=jdbc:mysql://192.168.xx:xx/xx
spring.datasource.primary.username=xx
spring.datasource.primary.password=xx
spring.datasource.primary.driver-class-name= com.mysql.cj.jdbc.Driver