java文件流传输的方法是什么

Java文件流传输主要有以下几种方法：

1. 字节流传输：使用InputStream和OutputStream进行字节流传输。可以使用InputStream读取源文件的字节数据，然后使用OutputStream将字节数据写入目标文件。

// 读取源文件的字节数据
InputStream inputStream = new FileInputStream("source.txt");
byte[] buffer = new byte[1024];
int bytesRead;
while ((bytesRead = inputStream.read(buffer)) != -1) {
    // 将字节数据写入目标文件
    outputStream.write(buffer, 0, bytesRead);
}
inputStream.close();
outputStream.close();

2. 字符流传输：使用Reader和Writer进行字符流传输。可以使用Reader读取源文件的字符数据，然后使用Writer将字符数据写入目标文件。

// 读取源文件的字符数据
Reader reader = new FileReader("source.txt");
char[] buffer = new char[1024];
int charsRead;
while ((charsRead = reader.read(buffer)) != -1) {
    // 将字符数据写入目标文件
    writer.write(buffer, 0, charsRead);
}
reader.close();
writer.close();

3. 缓冲流传输：使用BufferedInputStream和BufferedOutputStream进行字节流传输，或使用BufferedReader和BufferedWriter进行字符流传输。缓冲流可以提高读写效率，适用于大文件传输。

// 使用字节流传输
InputStream inputStream = new FileInputStream("source.txt");
OutputStream outputStream = new FileOutputStream("target.txt");
BufferedInputStream bufferedInputStream = new BufferedInputStream(inputStream);
BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(outputStream);
byte[] buffer = new byte[1024];
int bytesRead;
while ((bytesRead = bufferedInputStream.read(buffer)) != -1) {
    bufferedOutputStream.write(buffer, 0, bytesRead);
}
bufferedInputStream.close();
bufferedOutputStream.close();

// 使用字符流传输
Reader reader = new FileReader("source.txt");
Writer writer = new FileWriter("target.txt");
BufferedReader bufferedReader = new BufferedReader(reader);
BufferedWriter bufferedWriter = new BufferedWriter(writer);
char[] buffer = new char[1024];
int charsRead;
while ((charsRead = bufferedReader.read(buffer)) != -1) {
    bufferedWriter.write(buffer, 0, charsRead);
}
bufferedReader.close();
bufferedWriter.close();

这些方法可以根据具体的需求选择适合的方式进行文件传输。