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private static void fileCopy1(File from, File to){        InputStream in = null;        OutputStream out = null;        try{            //定义高效字节流            in = new BufferedInputStream(new FileInputStream(from));            out = new BufferedOutputStream(new FileOutputStream(to));            //传输            int b = 0;            while((b = in.read())!=-1){                out.write(b);            }        }catch(Exception e){            e.printStackTrace();        }finally{            try{                assert in != null;                in.close();                assert out != null;                out.close();            }catch(Exception e){                e.printStackTrace();            }finally{                in = null;                out = null;            }        }    }    // 使用字符流复制，只能复制文本文件    private static void fileCopy2(File from,File to){        Reader r = null;        Writer w= null;        try{            r = new BufferedReader(new FileReader(from));            w = new BufferedWriter(new FileWriter(to));            int b = 0;            while((b = r.read())!=-1){                w.write(b);            }        }catch(Exception e){            e.printStackTrace();        }finally{            try{                assert r != null;                r.close();                assert w != null;                w.close();            }catch(Exception e){                e.printStackTrace();            }finally{                r = null;                w = null;            }        }    }

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