[开发] Java文件操作

参考文献

读取Java文件到byte数组的三种方式
Java字符串写入文件的方式

写入文件

String testStr = "hello world!";
FileWriter writer = new FileWriter("/tmp/a/b/source.txt");
writer.write(testStr);
writer.flush();
writer.close();
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读取文件

File test = new File("/tmp/a/b/source.txt");
FileInputStream input = new FileInputStream(test);
FileChannel channel = input.getChannel();
ByteBuffer byteBuffer = ByteBuffer.allocate((int) channel.size());
while ((channel.read(byteBuffer)) > 0) {
}
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