package com.zyt.interview;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.Scanner;

import org.apache.commons.io.Charsets;
import org.apache.commons.io.FileUtils;
import
 
 org.apache.commons.io.LineIterator;

/**
 * 大檔案讀取(超過記憶體大小)
 * @author Administrator
 *
 */
public class BigFileRead {

    /**
     * Scanner讀取
     * @param path
     * @throws IOException 
     */
    public static void readScanner(String path) throws IOException{
        FileInputStream inputStream=null
 
;
        Scanner scan=null;
        try {
            inputStream=new FileInputStream(path);
            scan=new Scanner(inputStream, "UTF-8");
            while(scan.hasNextLine()){
                String line=scan.nextLine();
                System.out.println(line);
            }
            if
 
(scan!=null)
                throw scan.ioException();
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }finally {
            if (inputStream != null) {
                inputStream.close();
            }
            if (scan != null) {
                scan.close();
            }
        }
    }
    /**
     * apache common io 讀取
     * @param path
     */
    public void readApacheCommon(String path){
        LineIterator it=null;
        try {
            it = FileUtils.lineIterator(new File(path),Charsets.UTF_8.name());
            while(it.hasNext()){
                 String line = it.nextLine();
                 System.out.println(line);
            }
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }finally{
            LineIterator.closeQuietly(it);
        }
    }

    /**
     * buffer讀取
     */

    public void readBuffer(String path){
        File file=new File(path);
        try {
            BufferedReader reader=new BufferedReader(new FileReader(file), 10*1024*1024);
            String line=null;
            while((line=reader.readLine())!=null){
                System.out.println(line);
            }
            reader.close();
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }
}