java向文件写入的多种方式_java向文件中写入数据

1、使用FileWriter（自己测试效率最高）

try {
            File file = new File(path);//文件路径
            FileWriter fileWriter = new FileWriter(file);
            for (int i = 0; i < 1000; i++) {
                fileWriter.write(i + "==" + UUID.randomUUID().toString());
                fileWriter.write("\n");//换行写入
            }
            fileWriter.flush();//刷新数据，不刷新写入不进去
            fileWriter.close();//关闭流
        } catch (Exception e) {
            e.printStackTrace();
        }
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2、使用BufferedWriter

try {
            File file = new File(path);
            FileWriter fileWriter = new FileWriter(file);
            BufferedWriter bufferedWriter = new BufferedWriter(fileWriter);
            for (int i = 0; i < 1000; i++) {
                bufferedWriter.write(i + "==" + UUID.randomUUID().toString());
                bufferedWriter.newLine();
            }
            fileWriter.close();
            bufferedWriter.flush();
            bufferedWriter.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
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3、使用PrintWriter

try {
            File file = new File(path);
            FileWriter fileWriter = new FileWriter(file);
            PrintWriter printWriter = new PrintWriter(fileWriter);
            for (int i = 0; i < 1000; i++) {
                printWriter.write(i + "==" + UUID.randomUUID().toString());
                printWriter.write("\n");
            }
            fileWriter.close();
            printWriter.flush();
            printWriter.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
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4、使用FileOutputStream

try {
            File file = new File(path);
            FileOutputStream fileOutputStream = new FileOutputStream(file);
            for (int i = 0; i < 1000; i++) {
                fileOutputStream.write((i + "==" + UUID.randomUUID().toString()).getBytes());
                fileOutputStream.write(("\n").getBytes());
            }
            fileOutputStream.flush();
            fileOutputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
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5、使用BufferedOutputStream

try {
            File file = new File(path);
            FileOutputStream fileOutputStream = new FileOutputStream(file);
            BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(fileOutputStream);

            for (int i = 0; i < 1000; i++) {
                bufferedOutputStream.write((i + "==" + UUID.randomUUID().toString()).getBytes());
                bufferedOutputStream.write(("\n").getBytes());
            }
            fileOutputStream.flush();
            fileOutputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
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