Java multithreaded read-write file instance

Source: Internet
Author: User
Tags mongodb postgresql redis

Java multithreaded Read file:

Package Com.myjava;
Import java.util.ArrayList;
Import java.util.List; public class Threadreaddemo {/**java multi-threaded read large file * @param args/public static void main (string[] args) {Thread t1=
		New Thread (New multithread (), "A");
		Thread T2=new Thread (new multithread (), "B");
		T1.start ();
	T2.start ();
	} class Multithread implements runnable{private static bufferedreader br = NULL;
	Private list<string> List;
		static{try {br = new BufferedReader (New FileReader ("F://threaddemo.txt"), 10);
		catch (FileNotFoundException e) {//TODO auto-generated catch block E.printstacktrace ();
		} public void Run () {String = null;
		int count = 0;
			while (true) {//system.out.println (Thread.CurrentThread (). GetName ());
			This.list = new arraylist<string> (); Synchronized (BR) {try {while (line = Br.readline ())!= null) {if (count<15) {list.add (line);
							}else {list.add (line);
							Count = 0;
				A catch (IOException e) {e.printstacktrace ());
				} try {Thread.Sleep (1);
			Display (this.list);
			catch (Interruptedexception e) {e.printstacktrace ();
		} if (line = = null) break;
		} public void display (List<string> List) {for (String str:list) {System.out.println (str);
	} System.out.println (List.size ()); }

Java multithreaded write file:

Package Com.myjava;

Import Java.util.concurrent.ConcurrentLinkedQueue;
		/** * Multi-threaded Write file * * @author Administrator * */public class Threaddemo {public static void main (string[] args) {
		File File=new file ("F:" +file.separator+ "ThreadDemo.txt");
			try {fileoutputstream out=new fileoutputstream (file, true);
			Concurrentlinkedqueue<string> queue=new concurrentlinkedqueue<string> (); for (int i=0;i<10;i++) {new Thread (new Mythread (queue, Thread +i+ ",")). Start ()//multithreading writes data to the queue new thread (new Deal
				File (Out,queue)). Start ()//listener thread, continuously read data from queue to write to file try {thread.sleep (3000); if (!
				Thread.CurrentThread (). IsAlive ()) {System.out.println ("thread closed");
			The catch (Interruptedexception e) {//TODO auto-generated catch block E.printstacktrace ();
		} catch (FileNotFoundException e) {e.printstacktrace ();
}	}/** * The data to be written to the file is stored in the queue * * @author Administrator */class Mythread implements Runnable {private concurrentl
	Inkedqueue<string> queue;

	Private String contents; Public Mythread () {} public mythread (concurrentlinkedqueue<string> queue, String contents) {This.queue = Queu
	this.contents = contents;
		@Override public void Run () {try {thread.sleep (100);
		catch (Interruptedexception e) {//TODO auto-generated catch block E.printstacktrace ();
	} queue.add (contents); /** * Writes data from the queue to the file * @author Administrator */class Dealfile implements Runnable {private FileOutputStream out

	Private concurrentlinkedqueue<string> queue; Public Dealfile () {} public dealfile (FileOutputStream out, concurrentlinkedqueue<string> queue) {this.out = O
	This.queue = queue;
						@Override public void Run () {synchronized (\) {while (true) {if (!queue.isempty ()) {try { Out.write (Queue.poll (). GetBytes ("UTF-8"));
					catch (IOException e) {//TODO auto-generated catch block E.printstacktrace ();
				} try {thread.sleep (100);
				catch (Interruptedexception e) {e.printstacktrace (); }



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