Day21 read-write data in the Java language (ii)

Day21 read-write data in the Java language (ii)

First, overview:

Using IO to write files is a function of downloading. So it is necessary to say it alone.

Second, write function: (download)

The Write function is also delimited for character Stream writes and Byte Stream writes in two ways.

(i): Character stream write data

1, FileWriter class.

2, BufferedWriter class. With buffered stream

(ii): byte stream Write data

1, FileOutputStream class.

2, Bufferoutputstream class. With buffered streams

Third, specific examples

(i): Character stream write data

IO data stream Output "FileWriter" Package Www.com.c2;import Java.io.filewriter;import Java.io.ioexception;public class Io06 { public static void Main (string[] args) {//1, preparing data to be written to String str = "My name is ls"; try {//2, create instance, write FileWriter FWA = N with append EW FileWriter ("D:\\ls.txt", true),//3, write Data fwa.write (str),//4, close data Fwa.close ();} catch (IOException e) {e.printstacktrace ();}}}

IO data stream Output "BufferedWriter" package Www.com.c2;import java.io.bufferedwriter;import Java.io.filewriter;import Java.io.ioexception;public class Io08 {public static void main (string[] args) {try {//1, create instance bufferedwriter bw = new Buffer Edwriter (New FileWriter ("D:\\ls.txt", true)); String str = "Hello!" I'm John Doe. ";///2, write Bw.write (str);//3, empty buffer Bw.flush ();} catch (IOException e) {e.printstacktrace ();}}

(ii) byte stream write data:

IO data stream output "FileOutputStream" package www.com.c2;import java.io.filenotfoundexception;import  java.io.fileoutputstream;import java.io.ioexception;//output Stream/* Step: 1, prepare the data you need to write 2, create FileOutputStream object 3, write  *///Note: When your file does not have a corresponding file under the specified path, the corresponding file is created. If there is a file, the data content is replaced by default Public class io05 {public static void main (string[]  args)  {//1, prepare the data you need to write string str =  "Hello";//Convert the string to a character array byte[] bt =  Str.getbytes (); try {//default Replace Write//2, object to create FileOutputStream fileoutputstream fos = new  FileOutputStream ("D:\\zs.txt");//3, default replacement Write  fos.write (BT),//4, turn off data stream Fos.close (),//Append to write/ 2.1 are appended after data based on later data back. Similar to log management Fileoutputstream fo = new fileoutputstream ("D://ls.txt",  true);// 2.2 Append Write Fo.write (BT);//2.3 Close data stream fo.close ();}  catch  (filenotfoundexception e)  {e.printstacktrace ();}  catch  (ioexception e)  {e.printstacktrace ();}}

IO data stream Output "Bufferoutputstream" package Www.com.c2;import Java.io.bufferedoutputstream;import Java.io.filenotfoundexception;import Java.io.fileoutputstream;import Java.io.ioexception;public class Io07 {public static void Main (string[] args) {try {//1, create instance appended after field Bufferedoutputstream Bops = new Bufferedoutputstream (new FileOutputStream ("D:\\ls.txt", true));//2, write Bops.write ("Hello!" ". GetBytes ());//3, emptying buffer Bops.flush ();} catch (FileNotFoundException e) {e.printstacktrace ();} catch (IOException e) {e.printstacktrace ()}}}

Iv. Concluding remarks:

Here we will talk about the reading and writing of file data is finished, will be commonly used in these few learn to OK

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Day21 read-write data in the Java language (ii)