一、IO流的分類
字符流
Reader
InputStreamReader（節(jié)點(diǎn)流）
BufferedReader（處理流）
Writer
OutputStreamWriter（節(jié)點(diǎn)流）
BufferedWriter（處理流）
PrintWriter
字節(jié)流
InputStream
FileInputStream（節(jié)點(diǎn)流）
BufferedInputStream（處理流）
ObjectInputStream（處理流）
PrintStream
OutputStream
FileOutputStream（節(jié)點(diǎn)流）
BufferedOutputStream（處理流）
ObjectOutputStream（處理流）
斷點(diǎn)處理的流
RandomAccessfile
二、IO流的用法
1、轉(zhuǎn)換流的用法
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FileInputStream in = new FileInputStream(newFile("")); Readerreader = new InputStreamReader(in);//字節(jié)轉(zhuǎn)字符 FileOutputStreamout = new FileOutputStream(newFile("")); Writer writer = new OutputStreamWriter(out);//字符轉(zhuǎn)字節(jié) |
2、對(duì)象序列化,對(duì)象需要實(shí)現(xiàn)Serializable接口
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FileOutputStreamfileOutputStream = new FileOutputStream("C:\\Users\\lx\\Desktop\\Record.txt");ObjectOutputStreamobjectOutputStream = new ObjectOutputStream(fileOutputStream);objectOutputStream.writeObject(object);//向指定文件寫入對(duì)象objectobjectOutputStream.close();FileInputStreamfileInputStream = new FileInputStream("C:\\Users\\lx\\Desktop\\Record.txt");ObjectInputStreamobjectInputStream = new ObjectInputStream(fileInputStream);object = objectInputStream.readObject();//讀取得到對(duì)象objectfileInputStream . lose(); |
3、斷點(diǎn)的運(yùn)用
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public class Copy extends Thread{ //可以利用多線程實(shí)現(xiàn)拷貝 longstart; longend; Filesorce; Filetargetdir; publicCopy() { } publicCopy(longstart,long end, File sorce, File targetdir) { //利用構(gòu)造方法傳遞需要拷貝的長度，拷貝開始位置，以及目標(biāo)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(); //獲取斷點(diǎn)位置 if(seek== end){ break; } } targetRaf.close(); souceRaf.close(); } catch (IOException e) { e.printStackTrace(); } }} |
4、字節(jié)流的用法
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public class Test_InputStream { //利用字節(jié)流獲取文本文件內(nèi)容，但是容易出現(xiàn)問題 /* //可能出現(xiàn)int長度越界 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); }*/ //可能出現(xiàn)亂碼 public static void main(String[] args) throws IOException { File file = new File("C:\\Users\\lx\\Desktop\\test\\33.txt"); InputStream inputStream = new FileInputStream(file); //統(tǒng)計(jì)每次讀取的實(shí)際長度 int len = 0; //聲明每次讀取1024個(gè)字節(jié) 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()); }}//利用字節(jié)流拷貝文件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、緩存字符流的用法
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publicstatic void main(String[] args) throws IOException { //緩存字符流實(shí)現(xiàn)寫入文件 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(); //字符流千萬不要忘了flush!!!!!!!!!!!!!!!!!!!!!!!!!!!!! }} |
總結(jié)
以上就是本文關(guān)于Java IO流相關(guān)知識(shí)代碼解析的全部內(nèi)容，希望對(duì)大家有所幫助。感興趣的朋友可以繼續(xù)參閱本站其他相關(guān)專題，如有不足之處，歡迎留言指出。感謝朋友們對(duì)本站的支持！
原文鏈接：http://blog.csdn.net/qq_24065713/article/details/76407833
