JAVA.io讀寫文件的方法

//讀取文件(字節(jié)流)
    InputStream in = new FileInputStream("d:\\1.txt");
    //寫入相應(yīng)的文件
    OutputStream out = new FileOutputStream("d:\\2.txt");
    //讀取數(shù)據(jù)
    //一次性取多少字節(jié)
    byte[] bytes = new byte[2048];
    //接受讀取的內(nèi)容(n就代表的相關(guān)數(shù)據(jù)，只不過(guò)是數(shù)字的形式)
    int n = -1;
    //循環(huán)取出數(shù)據(jù)
    while ((n = in.read(bytes,0,bytes.length)) != -1) {
      //轉(zhuǎn)換成字符串
      String str = new String(bytes,0,n,"GBK"); #這里可以實(shí)現(xiàn)字節(jié)到字符串的轉(zhuǎn)換，比較實(shí)用
      System.out.println(str);
      //寫入相關(guān)文件
      out.write(bytes, 0, n);
    }
    //關(guān)閉流
    in.close();
    out.close();

//讀取文件(緩存字節(jié)流)
    BufferedInputStream in = new BufferedInputStream(new FileInputStream("d:\\1.txt"));
    //寫入相應(yīng)的文件
    BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream("d:\\2.txt"));
    //讀取數(shù)據(jù)
    //一次性取多少字節(jié)
    byte[] bytes = new byte[2048];
    //接受讀取的內(nèi)容(n就代表的相關(guān)數(shù)據(jù)，只不過(guò)是數(shù)字的形式)
    int n = -1;
    //循環(huán)取出數(shù)據(jù)
    while ((n = in.read(bytes,0,bytes.length)) != -1) {
      //轉(zhuǎn)換成字符串
      String str = new String(bytes,0,n,"GBK");
      System.out.println(str);
      //寫入相關(guān)文件
      out.write(bytes, 0, n);
    }
    //清楚緩存
    out.flush();
    //關(guān)閉流
    in.close();
    out.close();

//讀取文件(字節(jié)流)
    InputStreamReader in = new InputStreamReader(new FileInputStream("d:\\1.txt"),"GBK");
    //寫入相應(yīng)的文件
    OutputStreamWriter out = new OutputStreamWriter(new FileOutputStream("d:\\2.txt"));
    //讀取數(shù)據(jù)
    //循環(huán)取出數(shù)據(jù)
    byte[] bytes = new byte[1024];
    int len = -1;
    while ((len = in.read()) != -1) {
      System.out.println(len);
      //寫入相關(guān)文件
      out.write(len);
    }
    //清楚緩存
    out.flush();
    //關(guān)閉流
    in.close();
    out.close();

//讀取文件(字符流)
    BufferedReader in = new BufferedReader(new InputStreamReader(new FileInputStream("d:\\1.txt"),"GBK"));#這里主要是涉及中文
    //BufferedReader in = new BufferedReader(new FileReader("d:\\1.txt")));
    //寫入相應(yīng)的文件
    BufferedWriter out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream("d:\\2.txt"),"GBK"));
    //BufferedWriter out = new BufferedWriter(new FileWriter("d:\\2.txt"))；
    //讀取數(shù)據(jù)
    //循環(huán)取出數(shù)據(jù)
    String str = null;
    while ((str = in.readLine()) != null) {
      System.out.println(str);
      //寫入相關(guān)文件
      out.write(str);
      out.newLine();
    }
    
    //清楚緩存
    out.flush();
    //關(guān)閉流
    in.close();
    out.close();

//讀取文件(字節(jié)流)
    Reader in = new InputStreamReader(new FileInputStream("d:\\1.txt"),"GBK");
    //寫入相應(yīng)的文件
    PrintWriter out = new PrintWriter(new FileWriter("d:\\2.txt"));
    //讀取數(shù)據(jù)
    //循環(huán)取出數(shù)據(jù)
    byte[] bytes = new byte[1024];
    int len = -1;
    while ((len = in.read()) != -1) {
      System.out.println(len);
      //寫入相關(guān)文件
      out.write(len);
    }
    //清楚緩存
    out.flush();
    //關(guān)閉流
    in.close();
    out.close();