一、IO流的分类
字符流
Reader
InputStreamReader(节点流)
BufferedReader(处理流)
Writer
OutputStreamWriter(节点流)
BufferedWriter(处理流)
PrintWriter
字节流
InputStream
FileInputStream(节点流)
BufferedInputStream(处理流)
ObjectInputStream(处理流)
PrintStream
OutputStream
FileOutputStream(节点流)
BufferedOutputStream(处理流)
ObjectOutputStream(处理流)
断点处理的流
RandomAccessfile
二、IO流的用法
1、转换流的用法
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2、对象序列化,对象需要实现Serializable接口
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();3、断点的运用
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();}}}4、字节流的用法
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);}}5、缓存字符流的用法
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!!!!!!!!!!!!!!!!!!!!!!!!!!!!!}}总结
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