base64與文件轉換

#base64引入

這裏使用的是maven

<dependency>
    <groupId>commons-codec</groupId>
    <artifactId>commons-codec</artifactId>
    <version>1.10</version>
</dependency>

#base64與String轉換

@RequestMapping(value="/base64TextTest")
    public static void base64TextTest() throws IOException {
        final Base64 base64 = new Base64();
        final String text = "test";
        final byte[] textByte = text.getBytes("UTF-8");
        //編碼
        final String encodedText = base64.encodeToString(textByte);
        System.out.println(encodedText);
        //解碼
        System.out.println(new String(base64.decode(encodedText), "UTF-8"));
    }

#base64與文件轉換

@RequestMapping(value="/base64FileTest")
    public static void base64FileTest() throws IOException {
        String base64String = null;
        InputStream in = null;
        final Base64 base64 = new Base64();
        String fileName = "D:/data/20191217145156.png";
        File file = new File(fileName);
        in = new FileInputStream(file);
        byte[] bytes=new byte[(int)file.length()];
        in.read(bytes);
　　　　　
        base64String = base64.encodeToString(bytes);
        System.out.println(base64String);

        File file2 = null;
        //建立文件目錄
        String filePath="D:/data1";
//        String filePath=request.getSession().getServletContext().getRealPath("images/"); 
        File  dir=new File(filePath);
        if (!dir.exists() && !dir.isDirectory()) {
            dir.mkdirs();
        }
        BufferedOutputStream bos = null;
        java.io.FileOutputStream fos = null;
        String fileName2 = "new_file.png";
        try {
            byte[] bytes1 = Base64.decodeBase64(base64String);
            file=new File(filePath+"/"+fileName2);
            fos = new java.io.FileOutputStream(file);
            bos = new BufferedOutputStream(fos);
            bos.write(bytes1);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (bos != null) {
                try {
                    bos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (fos != null) {
                try {
                    fos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }