testio

In JDK 1.4, the NIO package is added, which is aimed at improving the IO speed. However, we all know that with the NIO package added, the old Io package is actually overwritten. Even if the NIO package is not displayed, You can obviously feel the speed improvement. In addition, many people only know the inputstream or outputstream of the buffer when using the IO package, and the speed will be faster. So, is there a gap in speed between the above? What is the gap? We will perform an I/O operation

;Importjava.io.IOException;ImportJava.io.PrintWriter;ImportJava.io.StringReader; Public classBufferedinputfile {//1. Buffered input file Public StaticString read (string filename)throwsioexception{//BufferedReader is designed to improve performanceBufferedReader in =NewBufferedReader (Newfilereader (filename)); String s; StringBuilder SB=NewStringBuilder (); while((S=in.readline ())! =NULL) Sb.append (s); Sb.append ("\ n");//ReadLine has deleted the line breakIn.close (); returnsb.to

: Buffer3) printstream: produce formatted output2.2.4 character-oriented outputstream Encapsulation1) bufferedwrite: corresponds to bufferedoutstream2) printwrite: corresponds to printstream3. randomaccessfile1) You can use the randomaccessfile object to read and write files.2) when an object is generated, you can specify the nature of the file to be opened: R, read-only; W, write-only; RW, read/write3) You can directly jump to the specified position in the file. 4. An example of an I/O Applicat

types (such as int and char) to stream.2) bufferedoutstream: Buffer3) printstream: produce formatted output2.2.4 character-oriented outputstream Encapsulation1) bufferedwrite: corresponds2) printwrite: corresponds3. randomaccessfile1) You can use the randomaccessfile object to read and write files.2) when an object is generated, you can specify the nature of the file to be opened: R, read-only; W, write-only; RW, read/write3) You can directly jump to the specified position in the file.4. An exa

) bufferedoutstream: Buffer3) printstream: produce formatted output2.2.4 character-oriented outputstream Encapsulation1) bufferedwrite: corresponds2) printwrite: corresponds3. randomaccessfile1) You can use the randomaccessfile object to read and write files.2) when an object is generated, you can specify the nature of the file to be opened: R, read-only; W, write-only; RW, read/write3) You can directly jump to the specified position in the file.4. An example of an I/O ApplicationImport java. Io

outputstream 1) dataioutstream: outputs basic data types (such as int and char) to stream. 2) bufferedoutstream: Buffer 3) printstream: produce formatted output 2.2.4 character-oriented outputstream Encapsulation 1) bufferedwrite: corresponds 2) printwrite: corresponds 3. randomaccessfile 1) You can use the randomaccessfile object to read and write files. 2) when an object is generated, you can specify the nature of the file to be opened: R, read-only; W, write-only; RW, read/write 3)

) bufferedoutstream: Buffer3) printstream: produce formatted output2.2.4 character-oriented outputstream Encapsulation1) bufferedwrite: corresponds2) printwrite: corresponds3. randomaccessfile1) You can use the randomaccessfile object to read and write files.2) when an object is generated, you can specify the nature of the file to be opened: R, read-only; W, write-only; RW, read/write3) You can directly jump to the specified position in the file.4. An example of an I/O ApplicationImport java. Io

and char) to stream.2) bufferedoutstream: Buffer3) printstream: produce formatted output2.2.4 character-oriented outputstream Encapsulation1) bufferedwrite: corresponds2) printwrite: corresponds3. randomaccessfile1) You can use the randomaccessfile object to read and write files.2) when an object is generated, you can specify the nature of the file to be opened: R, read-only; W, write-only; RW, read/write3) You can directly jump to the specified position in the file.4. An example of an I/O Appl

types (such as int and char) to stream. 2) bufferedoutstream: Buffer 3) printstream: produce formatted output 2.2.4 character-oriented outputstream Encapsulation 1) bufferedwrite: corresponds 2) printwrite: corresponds 3. randomaccessfile 1) You can use the randomaccessfile object to read and write files. 2) when an object is generated, you can specify the nature of the file to be opened: R, read-only; W, write-only; RW, read/write 3) You can directly jump to the specified position in the file.

types (such as int and char) to stream. 2) bufferedoutstream: Buffer 3) printstream: produce formatted output 2.2.4 character-oriented outputstream Encapsulation 1) bufferedwrite: corresponds 2) printwrite: corresponds 3. randomaccessfile 1) You can use the randomaccessfile object to read and write files. 2) when an object is generated, you can specify the nature of the file to be opened: R, read-only; W, write-only; RW, read/write 3) You can directly jump to the specified position in the file.

outputstream1) dataioutstream: outputs basic data types (INT, Char, etc.) to stream. 2) bufferedoutstream: Use buffer 3) printstream: Generate formatted output 2.2.4 used to encapsulate character-oriented outputstream1) bufferedwrite: corresponds to 2) printwrite: corresponds to 3. randomaccessfile1) You can use the randomaccessfile object to perform read and write operations on the file. 2) when an object is generated, you can specify the nature of the file to be opened: R, read-only; W, write

you use BufferedReader when using readLine (), use DataInputStream 2) BufferedReader: corresponds to BufferedInputStream 3) LineNumberReader: corresponds to LineNumberInputStream 4) PushBackReader: corresponds to PushbackInputStream 2.3FilterOutStream types 2.2.3 encapsulate byte-oriented OutputStream 1) DataIOutStream: outputs basic data types (such as int and char) to stream. 2) BufferedOutStream: Buffer 3) PrintStream: produce formatted output 2.2.4 character-oriented OutputStream Encapsulat

: // www.python.org '] Def test (url ): Return urllib2.urlopen (url). read () Def testIO (nbFutures ): Ts = time. time () Map (test, urls * nbFutures) Span = time. time ()-ts Print "time spend", span TestIO (10) I will not list the code in different concurrent libraries because it is similar. You can refer to the computing-intensive code for reference. Through tests, we can find that the use of m

environment variables: Public Static void Main (string[] args) { system.getproperties (). List (System.out);}Look at the output of all the information, a bit long:1--Listing properties--2Java.runtime.name=Java (TM) SE Runtime Environment3Sun.boot.library.path=E:\MyEclipse10\Common\binary\com.sun ....4java.vm.version=11.3-B025Java.vm.vendor=Sun Microsystems Inc.6Java.vendor.url=http://java.sun.com/7Path.separator=;8Java.vm.name=java HotSpot (TM) 64-Bit Server VM9file.encoding.pkg=Sun.ioTenuse

Visual editor, alt+1 to 9 keys, switch to Tool area, TAB key, select button, ESC, return to editpublic class Testio {public static void Main (string[] args) {String filename = "D:" + file.separator + "Hello.txt";File File = new file (filename);SYSTEM.OUT.PRINTLN ("Standard output-console");try {FileOutputStream fileout = new FileOutputStream (filename);PrintStream prt = new PrintStream (file);System.setout (PRT);SYSTEM.OUT.PRINTLN ("standard output Re

(Testio).-export ([START_PROC/1]).Name (),{a,b,c} =erlang:now (),Integer_to_list (A) ++integer_to_list (B) ++integer_to_list (C).Io (){OK,FD} = File:open ("./data/" ++name (), [Write,raw,binary,append]),File:write (Fd, "Hi Zcc,nice to Meet You"),File:read (fd,23),File:close (Fd).Start_proc (Num)io = Fun ()-io () end,Case Num =:= 0ofTrue->ok;False-> spawn (IO), Timer:sleep (1), Start_proc (Num-1)End.View kernel-related information under LinuxVmstat–n

: Using buffers3) PrintStream: produces formatted outputThe 2.2.4 is used to encapsulate character-oriented OutputStream1) Bufferedwrite: with corresponding2) Printwrite: with corresponding3. Randomaccessfile1) Read and write files can be completed by Randomaccessfile object2) When generating an object, you can indicate the nature of the file to be opened: R, read only, W, write only, rw readable and writable3) You can jump directly to the location specified in the file4. An example of an I/O ap

2 10 Concurrent I/OTest code -Module (testio ). -Export ([start_proc/1]). Name ()-> {A, B, C} = erlang: now (), Integer_to_list (A) ++ Integer_to_list (B) ++ Integer_to_list (C ). Io ()-> {OK, Fd} = file: open ("./data/" ++ name (), [write, raw, binary, append]), File: write (Fd, "Hi zcc, nice to meet you "), File: read (Fd, 23 ), File: close (Fd ). Start_proc (Num)-> IO = fun ()-> io () end, Case Num =: = 0of True-> OK; False-> spawn (IO), timer: s

.gz (11,670,726 bytes)· Orion_solaris64_sparc.gz (898,929 bytes)· Orion_solaris_x8664.gz (655,975 bytes)· Orion_linux_em64t.gz (767,380 bytes)· Orion10.2_linux.gz (630,354 bytes)· Orion10. 2_windows.msi (7,865,856 bytes)· Users guideAs you can see, this software already supports multiple OS environments. Unfortunately,OracleIt does not provide service support for the software. However, this does not affect the normal use of the software. From my test results, the software is really a good storag

Import Java.io.bufferedinputstream;import Java.io.bytearrayinputstream;import Java.io.ByteArrayOutputStream; Import Java.io.ioexception;import Java.io.inputstream;import Org.junit.test;public class Testio { Bytearrayoutputstream BAOs = new Bytearrayoutputstream (), @Testpublic void Test1 () throws Exception {Process exec = Runtime . GetRuntime (). EXEC ("ipconfig"); InputStream InputStream = Exec.getinputstream (); byte[] bytes = new Byte[1024];int le