使用 Quartz Scheduler 自动使用 FileWriter 写入文件的问题

Question

我选择了近200个文件，在特定时间自动写入某个位置。在 Quartz 调度程序中创建了一个单独的作业名称。该作业将在某个时间触发。只有在所有文件都写入后我才能读取文件。写入一个文件后我无法读取。我在写入一个文件后关闭了 FileWriter。如何访问并读取已写入硬盘的文件

File f = new File(directory.getAbsolutePath() + File.separatorChar + context.getTrigger()
        .getJobName() + ".sql");
System.out.println(f.getAbsolutePath());
fw = new FileWriter(f, true);
System.out.println("DBname is " + scheduleInfo.get("dbName"));
fw.append("CREATE DATABASE /*!32312 IF NOT EXISTS*/ `" + scheduleInfo.get("dbName") + "` /*!40100 DEFAULT CHARACTER SET latin1 */;\nUSE `"
        + scheduleInfo.get("dbName") + "`;\n");
ps1 = con.prepareStatement(dbname_exist);
ps1.setString(1, (String) scheduleInfo.get("dbName"));
rs1 = ps1.executeQuery();
if (rs1.next()) {
    backup_exits = true;

}

// if (br.readLine() == null||!backup_exits)
if (br.readLine() == null) {
    ps = con.prepareStatement(backup_data);
    ps.setString(1, (String) scheduleInfo.get("sch_id"));
    ps.executeUpdate();
    System.out.println("Failed to download file");
} else {
    while ((line = br.readLine()) != null) {
        System.out.println(line);
        fw.append(line + "\n");
    }
}

br.close();
fw.close();

Answer 1

您需要确保文件输出流已正确关闭。进一步关闭文件对象实例