[Java] File-type file management and IO read/write and copy operations

Document directory

• Summary of the file class:
• Files and folders
• Writer writes files
• Reader reads files
• File copy operations
• Download source code:

Summary of the file class:

1. create files and folders

2. File Reading

3. File writing

4. File Replication (Bytes stream, byte stream, and processing Stream)

5. Download the image at the image address

File and folder related functions (Boolean) mkdir () Create the directory specified by this abstract path name
(Boolean) mkdirs () creates the directory specified by this abstract path name, including all the parent directories that are required but do not exist.
(Boolean) Delete () delete the file or directory represented by this abstract path name
(Boolean) createnewfile () creates an empty file when the file with the specified name does not exist.
Create a file

Public static void newfile (string pathstring) {file = new file (pathstring); If (! File. exists () {try {If (file. createnewfile () {system. out. println ("File Created successfully") ;}} catch (exception e) {// todo: handle has tione. printstacktrace () ;}} else {system. out. println ("file already exists ");}}

Create a folder

Public static void newfilebox (string pathstring) {file file2 = new file (pathstring); If (! File2.exists () {If (file2.mkdirs () {system. out. println ("folder succeeded") ;}} else {system. out. println ("folder exists"); file2.delete (); // destroy file }}

Application:

public static void main(String[] args) {NewFile("test/file.txt");NewFileBox("test/a/a/a/a");}

Writer writes files into filewriter

public  static void ForFileWriter(String string,String fileName) {File file = new File(fileName);try {FileWriter fWriter = new FileWriter(file);fWriter.write(string);fWriter.close();} catch (Exception e) {// TODO: handle exceptione.printStackTrace();}}

Use bufferedwriter to write files

public static void ForBufferedWriter(String string,String desFile) {BufferedWriter bWriter = null;try {bWriter = new BufferedWriter(new FileWriter(new File(desFile)));bWriter.write(string.toString());bWriter.close();} catch (Exception e) {e.printStackTrace();}}

Application:

Public static void main (string [] ARGs) {forfilewriter ("write files with filewriter", "test/writer1.txt"); forbufferedwriter ("write files with bufferedwriter ", "Test/writer2.txt ");}

Reader reads files with filereader

Public static void testreadbyreader (string filename) {file = new file (filename); filereader FD = NULL; try {FD = new filereader (File ); char [] arr = new char [1024*1000*6]; int Len = fiis. read (ARR); string data = new string (ARR, 0, Len); FCM. close (); system. out. println (the file content read by filereader in Filename + "is \ n" + data);} catch (exception e) {// todo auto-generated catch blocke. printstacktrace ();}}

Use fileinputstream to read files

Public static void testreadbyinputstream (string filename) {file = new file (filename); fileinputstream FD = NULL; try {FD = new fileinputstream (File ); byte [] arr = new byte [1024*1000*6]; int Len = fiis. read (ARR); string data = new string (ARR, 0, Len); FCM. close (); system. out. the file content read by fileinputstream in println (filename + "is \ n" + data);} catch (exception e) {// todo auto-generated catch blocke. printstacktrace ();}}

Read files with bufferedreader

Public static void testreadbybufferedreader (string filename) {bufferedreader breader = NULL; string line = NULL; stringbuffer buffer = new stringbuffer (); try {breader = new bufferedreader (New filereader (new file (filename); While (line = breader. readline ())! = NULL) {buffer. append (line ). append ("\ n") ;}} catch (exception e) {// todo: handle has tione. printstacktrace ();} system. out. println (filename + "the file content read by bufferedreader is: \ n" + buffer. tostring ());}

Application:

Public static void main (string [] ARGs) {testreadbyinputstream ("Res/.txt"); testreadbyreader ("Res/.txt"); testreadbybufferedreader ("Res/.txt ");}

Copy an object using the copy object method.

public static void FileCopy1(String readfile,String writeFile) {try {FileReader input = new FileReader(readfile);FileWriter output = new FileWriter(writeFile);int read = input.read();while ( read != -1 ) {output.write(read);read = input.read();}input.close();output.close();} catch (IOException e) {System.out.println(e);}}

Byte stream Replication

public static void FileCopy2(String readfile,String writeFile) {try {FileInputStream input = new FileInputStream(readfile);FileOutputStream output = new FileOutputStream(writeFile);int read = input.read();while ( read != -1 ) {output.write(read);read = input.read();}input.close();output.close();} catch (IOException e) {System.out.println(e);}}

Process Stream Replication

public static void FileCopy3(String readfile,String writeFile) {BufferedReader bReader = null;BufferedWriter bWriter = null;String line = null; try {bReader = new BufferedReader(new FileReader(new File(readfile)));bWriter = new BufferedWriter(new FileWriter(new File(writeFile)));while ((line = bReader.readLine())!=null) {bWriter.write(line);bWriter.newLine();}bWriter.close();bReader.close();} catch (Exception e) {// TODO: handle exceptione.printStackTrace();}}

Application:

Public static void main (string [] ARGs) {filecopy1 ("Res/.txt", "test/1.txt"); filecopy2 (" Res/ .txt "," test/2.txt "); filecopy3 ("Res/.txt", "test/3.txt"); filecopy2 (" Res/me.jpg "," test/33.jpg ");}

Source code download: http://download.csdn.net/detail/oyuntaolianwu/5804447