Java IO 流之拷贝（复制）文件

方式一（字符流读写复制文件，仅限文本文件）

  /**
     * 字符流读写复制文件
     *
     * @param src 源文件
     * @param out 目标文件
     */
    public static void FileReaderFileWriter(String src, String out) {
        FileWriter fileWriter = null;
        FileReader fileReader = null;
        try {
            
                
            fileWriter = new FileWriter(out);
            
                
            fileReader = new FileReader(src);

            
            char[] chars = new char[1024];
            
            int num = 0;
            while ((num = fileReader.read(chars)) != -1) {
                fileWriter.write(chars, 0, num);
                fileWriter.flush();
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                fileWriter.close();
                fileReader.close();
            } catch (IOException e) {
                e.printStackTrace();
            }

        }
    }

方式二（字符流缓冲区读写文件-高效，仅限文本文件）

    /**
     * 字符流缓冲区读写文件
     * 效率比较高
     * @param src 源文件
     * @param out 目标文件
     */
    public static void BufferReaderBufferWriter(String src, String out) {
        BufferedWriter bufferedWriter = null;
        BufferedReader bufferedReader = null;
        try {
            bufferedWriter = new BufferedWriter(new FileWriter(out));
            bufferedReader = new BufferedReader(new FileReader(src));

            String line = "";
            while ((line = bufferedReader.readLine()) != null) {
                bufferedWriter.write(line);
                bufferedWriter.newLine();
                bufferedWriter.flush();
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                bufferedWriter.close();
                bufferedReader.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    /**
     * 字节流读写复制文件
     * @param src 源文件
     * @param out 目标文件
     */
    public static void InputStreamOutputStream(String src, String out) {
        FileOutputStream outputStream = null;
        FileInputStream inputStream = null;
        try {
            outputStream = new FileOutputStream(out);
            inputStream = new FileInputStream(src);
            byte[] bytes = new byte[1024];
            int num = 0;
            while ((num = inputStream.read(bytes)) != -1) {
                outputStream.write(bytes, 0, num);
                outputStream.flush();
            }

        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                outputStream.close();
                inputStream.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

    }

方式三（字节流读写复制文件）

  /**
     * 字节流读写复制文件
     * @param src 源文件
     * @param out 目标文件
     */
    public static void InputStreamOutputStream(String src, String out) {
        FileOutputStream outputStream = null;
        FileInputStream inputStream = null;
        try {
            outputStream = new FileOutputStream(out);
            inputStream = new FileInputStream(src);
            byte[] bytes = new byte[1024];
            int num = 0;
            while ((num = inputStream.read(bytes)) != -1) {
                outputStream.write(bytes, 0, num);
                outputStream.flush();
            }

        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                outputStream.close();
                inputStream.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

    }

方式四（字节缓冲流读写复制文件）

    /**
     * 字节缓冲流读写复制文件
     * @param src 源文件
     * @param out 目标文件
     */
    public static void BufferInputStreamBufferOutputStream(String src, String out) {
        BufferedOutputStream bufferedOutputStream = null;
        BufferedInputStream bufferedInputStream = null;
        try {
            bufferedOutputStream = new BufferedOutputStream(new FileOutputStream(out));
            bufferedInputStream = new BufferedInputStream(new FileInputStream(src));
            byte[] bytes = new byte[1024];
            int num = 0;
            while ((num = bufferedInputStream.read(bytes)) != -1) {
                bufferedOutputStream.write(bytes, 0, num);
                bufferedOutputStream.flush();
            }

        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                bufferedOutputStream.close();
                bufferedInputStream.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

    }

运行代码

 public static void main(String args[]) {
        String src = "E:\\kejiang\\IdeaProjects\\JavaProjectTest\\src\\io\\CopyTextFileTest.java";
        String out = "E:\\kejiang\\IdeaProjects\\JavaProjectTest\\src\\io\\CopyTextFileTest_Copy.txt";
        
        
        
        BufferInputStreamBufferOutputStream(src, out);
    }

运行效果