Java文件写入

• 一、写入文件Demo

@Slf4j
public class WriteFileDemo {
    private static final List list;
    static {
        list = new ArrayList();
        list.add("java");
        list.add("python");
        list.add("go");
    }
    public static void main(String[] args) throws IOException {
        String fileUrl = "D:/1.txt";
        long start = System.currentTimeMillis();
        log.info("开始写入数据...");
        writeFile(fileUrl);
        log.info("写入数据结束，耗时 {} ms", (System.currentTimeMillis() - start));
    }
    private static void writeFile(String fileUrl) throws IOException {
        File file = new File(fileUrl);
        FileOutputStream fileOutputStream = null;
        OutputStreamWriter outputStreamWriter = null;
        BufferedWriter bufferedWriter = null;
        try {
            if(!file.exists()){
                if (!file.getParentFile().exists()) {
                    file.getParentFile().mkdirs();
                }
                file.createNewFile();
                fileOutputStream = new FileOutputStream(file);
            } else {
                fileOutputStream = new FileOutputStream(file,true);
            }
            outputStreamWriter = new OutputStreamWriter(fileOutputStream, "UTF-8");
            bufferedWriter = new BufferedWriter(outputStreamWriter);
            for (String str : list) {
                bufferedWriter.write(str + "n");
            }
            bufferedWriter.flush();
        } catch (IOException e) {
            log.error("redis to mongo error -> {} ", e);
        } finally {
            bufferedWriter.close();
            outputStreamWriter.close();
            fileOutputStream.close();
        }
    }
}

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