[JAVA] 자바 파일카피 / 자바 파일복사 / java copy file (191205 수정)

FileInputStream inputStream = new FileInputStream( origin_file );         
FileOutputStream outputStream = new FileOutputStream( new_file );
     
FileChannel fcin =  inputStream.getChannel();
FileChannel fcout = outputStream.getChannel();
     
long size = fcin.size();
fcin.transferTo(0, size, fcout);
     
fcout.close();
fcin.close();
     
outputStream.close();
inputStream.close();

public boolean copyFile(File originFile, File newFile) throws Exception {
        boolean bCopied = false;
        
        if (originFile == null) {
            System.err.println(“originFile == null”);
            return false;
        }
        
        if (newFile == null) {
            System.err.println(“newFile == null”);
            return false;
        }
        
        FileInputStream inputStream = null;
        FileOutputStream outputStream = null;
        FileChannel fcin = null;
        FileChannel fcout = null;
        
        try {
            // 원본파일이 반드시 존재해야 복사 가능하다.
            if (!originFile.exists()) {
                System.err.println(“!originFile.exists()”);
                return false;
            }
            
            // newFile 의 parentDir(부모 폴더)가 반드시 존재해야 한다. 존재하지 않을 경우 만들어줘야 함.
            boolean mkdir = makeParentDir(newFile.getAbsolutePath());
            if (!mkdir) {
                return false;
            }
            
            inputStream = new FileInputStream(originFile);
            outputStream = new FileOutputStream(newFile);
            
            fcin = inputStream.getChannel();
            fcout = outputStream.getChannel();

            long size = fcin.size();
            fcin.transferTo(0, size, fcout);
            
            bCopied = true;
            
        } catch (Exception e) {
            throw e;

        } finally {
            try {
                if (fcout != null) {
                    fcout.close();
                }
            } catch (Exception e) {
                // ignore
            } finally {
                fcout = null;
            }
            
            try {
                if (fcin != null) {
                    fcin.close();
                }
            } catch (Exception e) {
                // ignore
            } finally {
                fcin = null;
            }
            
            try {
                if (outputStream != null) {
                    outputStream.close();
                }
            } catch (Exception e) {
                // ignore
            } finally {
                outputStream = null;
            }
            
            try {
                if (inputStream != null) {
                    inputStream.close();
                }
            } catch (Exception e) {
                // ignore
            } finally {
                inputStream = null;
            }
        }
        
        return bCopied;
    }
    
    
    /**
     * 특정 파일패스의 부모 폴더가 없을 경우 만든다.
     *
     * @param filePath
     * @return
     */
    private boolean makeParentDir(String filePath) {
        boolean bResult = false;
        
        if (filePath == null || filePath.trim().length() == 0) {
            System.err.println(“makeParentDir : filePath == null || filePath.length() == 0”);
            return false;

        } else {
            filePath = filePath.trim();
        }

        // 역슬래시를 슬래시로 모두 변경
        if (filePath.indexOf(“\\“) > -1) {
            filePath = filePath.replace(“\\“, “/“);
        }

        // 슬래시 2개를 슬래시 1개로 모두 변경
        while (filePath.indexOf(“//”) > -1) {
            filePath = filePath.replace(“//”, “/”);
        }

        // 필요한 디렉토리 만들기
        int lastSlashPos = filePath.lastIndexOf(“/”);

        if (lastSlashPos > -1) {
            File d = new File(filePath.substring(0, lastSlashPos));
            if (d.exists()) {
                // 폴더 존재하면 생성할 필요없다.
                bResult = true;
            } else {
                bResult = d.mkdirs();
            }

        } else {
            System.err.println(“makeParentDir : lastSlashPos not exists”);
            return false;
        }

        return bResult;
    }