File操作-InputStreamReader/Writer

前面所举例的InputStream，OutputStream，是针对字节流进行操作的；FileReader，FileWriter是针对字符流进行操作的。另外在写入的时候并未提供编码格式，极易造成中文乱码。

InputStreamReader/OutputStreamWriter，为字节流与字符流的转换提供了途径

@Test    public void testInputStreamReader(){        BufferedReader br = null;        BufferedWriter bw = null;        try {            File file = new File("test1.txt");            File file1 = new File("test2.txt");            InputStream in  = new FileInputStream(file);            InputStreamReader iReader = new InputStreamReader(in, "UTF-8");            OutputStream out = new FileOutputStream(file1);            OutputStreamWriter osw = new OutputStreamWriter(out, "UTF-8");            br = new BufferedReader(iReader);            bw = new BufferedWriter(osw);            byte[] c = new byte[1024];            int len;            while((len = br.read())!= -1){                System.out.println("ASCII："+len+","+"vlaue :"+(char)len);                bw.write(len);            }            /*读入到字符数组*///          char[] c = new char[1024];//          int len;//          while((len = br.read(c))!= -1){//              System.out.println("字符长度："+len);//              String str = new String(c, 0, len);//              System.out.print(str);//              bw.write(c, 0, len);//          }            /*每次读取一行*///          String str;//          while((str = br.readLine()) != null){//              System.out.println(str);//              bw.write(str + "\n");////                bw.newLine();//              bw.flush();//          }        }catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }finally{            if(bw != null){                try {                    bw.close();                } catch (IOException e) {                    // TODO Auto-generated catch block                    e.printStackTrace();                }            }            if(br != null){                try {                    br.close();                } catch (IOException e) {                    // TODO Auto-generated catch block                    e.printStackTrace();                }            }        }    }