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| 使用Java新IO写符串到文件中 |
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/*
* Output:
File stream created successfully.
New buffer: position = 0 Limit = 1024 capacity = 1024
Buffer after loading: position = 30 Limit = 1024 capacity = 1024
Buffer after flip: position = 0 Limit = 30 capacity = 1024
Buffer contents written to file.
*/
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.FileNotFoundException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
public class MainClass {
public static void main(String[] args) {
String phrase = new String("www.java2java.com\n");
File aFile = new File("test.txt");
FileOutputStream outputFile = null;
try {
outputFile = new FileOutputStream(aFile, true);
System.out.println("File stream created successfully.");
} catch (FileNotFoundException e) {
e.printStackTrace(System.err);
}
FileChannel outChannel = outputFile.getChannel();
ByteBuffer buf = ByteBuffer.allocate(1024);
System.out.println("New buffer: position = " + buf.position()
+ "\tLimit = " + buf.limit() + "\tcapacity = "
+ buf.capacity());
// Load the data into the buffer
for (char ch : phrase.toCharArray()) {
buf.putChar(ch);
}
System.out.println("Buffer after loading: position = " + buf.position()
+ "\tLimit = " + buf.limit() + "\tcapacity = "
+ buf.capacity());
buf.flip();
System.out.println("Buffer after flip: position = " + buf.position()
+ "\tLimit = " + buf.limit() + "\tcapacity = "
+ buf.capacity());
try {
outChannel.write(buf);
outputFile.close();
System.out.println("Buffer contents written to file.");
} catch (IOException e) {
e.printStackTrace(System.err);
}
}
}
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