java io ioexception

Recently in the Bi Xiangdong Teacher's Java basic video IO part of the knowledge of the explanation. Because IO this piece of knowledge is very important, and small knowledge dot many, method also more, tonight make a simple summary for later review. IO Overview The method of the stream of words the method of byte th

Java IO (input output) stream I. IO stream Overview 1. IO stream is used for data transmission between devices. 2. Data Operations in Java are performed in a stream-based manner. 3. Classification: 1) data by Operation: byte streams (available in the early stage, can transfe

(file);} } } } Test class: public class Fileutilstest {public static void Main (string[] args) throws IOException { fileutils.listdirectory (New File ("D:\\iostudy")); } Run Result: Third, the use of Randomaccessfile class Randomaccessfile:java provides access to the contents of a file, either by reading a file or by writing a file. Randomaccessfile supports random access to files and can access any location in the file. Note

File ("Love 2.txt ");//file file1 = new File (" C:\\users\\hasee\\desktop\\qq20171107180120.png ");//note suffix, with and without a different file File1 = new File (SRC); File File2 = new file (dest);//Two formats can be copied over fileinputstream FIS = null; FileOutputStream fos = null;try {fis = new FileInputStream (file1); fos = new FileOutputStream (file2); byte[] B = new Byte[5] ; int len;while (len = Fis.read (b))! =-1) {//fos.write (b); Two types of errors: Fos.write (b, 0, b.length),

Direct code: Read the keyboard input data code demo:Import Java.io.ioexception;import Java.io.InputStream; /** * Read the keyboard input data and print it on the console. * * The keyboard itself is a standard input device, * for Java, */public class ReadKey {/** * @param args * @throws IOException */public static void Main (string[] args) throws IOException {//R

) {System.out.println (num); System.out.println (TEMP1); System.out.println (NewString (temp1,0, num)); } f.close ();; }}All of these are examples of node streams, and here's an example of a process flowExample 5: Process flow Public classFileinputstreamtest { Public Static voidMain (string[] args)throwsIOException {printstream ps=NULL; Try { //Create a node streamFileOutputStream fs =NewFileOutputStream ("D:\\javapro\\iojava\\xin.txt"); //wrapping FileOutputStrea

; Public voidgethtmlcontent () {Try{connect (); SendRequest (); Readresponse (); }Catch(IOException e) {System.err.println (e.tostring ()); }finally{ if(channel!=NULL){ Try{channel.close (); }Catch(IOException e) {}}} } Private voidConnect ()throwsioexception{//Connect to Csdninetsocketaddress socketaddress=NewInetsocketaddress ("Http://www.csdn.net", 80); Cha

IO ExampleThe following is a presentation of the file file.txtHello world! Hello nerd!Let's look at an example of a file read:Import java.io.*;public class test{public static void Main (string[] args) {try{BufferedReader br =New BufferedReader (New FileReader ("file.txt"));String line = Br.readline ();while (line! = null) {System.out.println (line);line = Br.readline ();}Br.close ();}catch (IOException e) {

be converted to the use of characters, you can specify the code table for file data.4. One instance, moving files1 Public Static voidCopy (string src, string desc)throwsException {2 3File Srcfile =NewFile (SRC);4File Descfile =NewFile (DESC);5InputStream in =NULL;6OutputStream out =NULL;7 Try {8in =NewFileInputStream (srcfile);9out =NewFileOutputStream (descfile);Ten intLen =-1; One byte[] bytes =New byte[1024 * 1024]; A while(len = in.read (bytes))

()) {System.out.println (It.next ()); } } Catch(IOException e) {e.printstacktrace (); } }}View CodeRecursively gets the files in the specified directory //recursively gets the files in the specified directory Public voidgetallfilesbyrecursive (String path) {File file=NewFile (path); if(File.exists ()) {file[] files=File.listfiles (); if(Files.length = = 0) {System.out.println ("The folder is empty!"); return; } Else {

FilesYou can use FileInputStream or filereader to read into a file based on binary, which is based on text. They do not need to read the entire file, but can read bytes, or characters sequentially, in the order in which they are stored.Using FileOutputStream or FileWriter, data can be written out to a file and stored in the order in which the data is written.Randomaccessfile can jump into a file, read data, or write data to a file. Random Access does not mean that you are actually reading data f

or spread across the entire directory tree, displaying the folders under the current file, and the list of files, which can traverse the entire directory tree. For example environment:->dirhome-->java ——— >jdk ——— >document.doc-->spring ——— >spring.zip ——— >springapi ———— > Document.doc-->pass.txt output:./java./java/jdk./ja