Java IO流相关知识代码解析

     FileInputStream in = new FileInputStream(newFile(""));           Readerreader = new InputStreamReader(in);//字节转字符      FileOutputStreamout = new FileOutputStream(newFile(""));      Writer writer = new OutputStreamWriter(out);//字符转字节

      FileOutputStreamfileOutputStream = new FileOutputStream("C://Users//lx//Desktop//Record.txt");      ObjectOutputStreamobjectOutputStream = new ObjectOutputStream(fileOutputStream);      objectOutputStream.writeObject(object);//向指定文件写入对象object      objectOutputStream.close();      FileInputStreamfileInputStream = new FileInputStream("C://Users//lx//Desktop//Record.txt");      ObjectInputStreamobjectInputStream = new ObjectInputStream(fileInputStream);      object = objectInputStream.readObject();//读取得到对象object      fileInputStream . lose();

public class Copy extends Thread{	//可以利用多线程实现拷贝  	longstart;	longend;	Filesorce;	Filetargetdir;	publicCopy() {	}	publicCopy(longstart,long end, File sorce, File targetdir) {		//利用构造方法传递需要拷贝的长度，拷贝开始位置，以及目标文件和源文件		super();		this.start= start;		this.end= end;		this.sorce= sorce;		this.targetdir= targetdir;	}	@Override	   publicvoid run(){		try{			RandomAccessFilesouceRaf = new RandomAccessFile(sorce,"r");			RandomAccessFiletargetRaf = new RandomAccessFile(newFile(targetdir,sorce.getName()),"rw");			souceRaf.seek(start);			targetRaf.seek(start);			intlen= 0;			byte[]bs = new byte[1024];			longseek;			System.out.println(start+"---->"+end+this.getName());			while((len= souceRaf.read(bs))!=-1){				targetRaf.write(bs, 0, len);				seek= souceRaf.getFilePointer();				//获取断点位置				if(seek== end){					break;				}			}			targetRaf.close();			souceRaf.close();		}		catch (IOException e) {			e.printStackTrace();		}	}}

public class Test_InputStream {	//利用字节流获取文本文件内容，但是容易出现问题	/*    //可能出现int长度越界  public static void main(String[] args) throws IOException {    InputStream inputStream = new FileInputStream(new File("C://Users//lx//Desktop//test//33.txt"));    byte[] b = new byte[inputStream.available()];      inputStream.read(b);    String str = new String(b);    System.out.println(str);  }*/	//可能出现乱码    	public static void main(String[] args) throws IOException {		File file = new File("C://Users//lx//Desktop//test//33.txt");		InputStream inputStream = new FileInputStream(file);		//统计每次读取的实际长度		int len = 0;		//声明每次读取1024个字节		byte[] b = new byte[2];		StringBuffer sBuffer = new StringBuffer();		while((len=inputStream.read(b))!=-1){			sBuffer.append(new String(b,0,len));		}		System.out.println(sBuffer.toString());	}}//利用字节流拷贝文件public void copy(File sourceFile, File targetDir) {	//	FileInputStreamfileInputStream = null;	FileOutputStreamfileOutputStream = null;	fileInputStream= new FileInputStream(sourceFile);	FiletargetFile = new File(targetDir,sourceFile.getName());	fileOutputStream= new FileOutputStream(targetFile);	byte[]b = new byte[1024];	intlen = 0;	while((len= fileInputStream.read(b)) != -1) {		fileOutputStream.write(b, 0, len);	}}

publicstatic void main(String[] args) throws IOException {	//缓存字符流实现写入文件	InputStreamin = System.in;	Readerreader = new InputStreamReader(in);	BufferedReaderbr = new BufferedReader(reader);	BufferedWriterbw = new BufferedWriter(new FileWriter(new File("src/1.txt")));	Strings="";	while((s=br.readLine())!=null) {		bw.write(s);		bw.newLine();		bw.flush();		//字符流千万不要忘了flush!!!!!!!!!!!!!!!!!!!!!!!!!!!!!	}}