一. 自己實現(xiàn)byte數(shù)組拷貝

public class Base64Util {

	// base64圖片 存儲的byte數(shù)組
    private byte[] baseByte= new byte[0];
    
    public static void main(String[] args) {
        Base64Util base64Util = new Base64Util();
        base64Util.base64Encoding();
    }

    private   void base64Encoding(){
        try {
            // 從本地resource目錄下獲取圖片
            ClassPathResource classPathResource = new ClassPathResource("/images/e88b27550495d06a041a7854fcd07b8c.jpg");
            // base64圖片前綴
            String pre = "data:image/jpg;base64,";
            // 讀取圖片
            FileInputStream fileInputStream = new FileInputStream(classPathResource.getFile());
            // 讀取字節(jié)長度
            int len = 0;
            // baseByte數(shù)組的容量
            int capacity = 0;
            byte [] bytes = new byte[1024];
            while ((len = fileInputStream.read(bytes)) != -1){
            	// 對原數(shù)組進行拷貝擴容
                baseByte= Arrays.copyOf(baseByte, len + capacity);
                // 將新數(shù)據(jù)拷貝到新擴容的數(shù)組
                System.arraycopy(bytes, 0, baseByte, capacity, len);
                // 數(shù)據(jù)容量增加
                capacity += len;
            }
            // 獲取base64編碼器
            Base64.Encoder encoder = Base64.getEncoder();
            // 將字節(jié)數(shù)組轉換base64
            String encodeToString = encoder.encodeToString(baseByte);
            System.out.println("======>>>>>>：" + pre + encodeToString);
            fileInputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

二. 使用ByteArrayOutputStream

public class Base64Util {
    
    public static void main(String[] args) {
        Base64Util base64Util = new Base64Util();
        base64Util.base64Encoding();
    }

    private   void base64Encoding(){
        try {
            // 從本地resource目錄下獲取圖片
            ClassPathResource classPathResource = new ClassPathResource("/images/e88b27550495d06a041a7854fcd07b8c.jpg");
            // base64圖片前綴
            String pre = "data:image/jpg;base64,";
            // 讀取圖片
            FileInputStream fileInputStream = new FileInputStream(classPathResource.getFile());
            // 讀取字節(jié)長度
            int len = 0;
            byte [] bytes = new byte[1024];
            while ((len = fileInputStream.read(bytes)) != -1){
            	// 存儲讀取的字節(jié)數(shù)組
				data.write(bytes, 0, len);
            }
            // 獲取字節(jié)數(shù)組
            byte[] baseByte = data.toByteArray();
            // 獲取base64編碼器
            Base64.Encoder encoder = Base64.getEncoder();
            // 將字節(jié)數(shù)組轉換base64
            String encodeToString = encoder.encodeToString(baseByte);
            System.out.println("======>>>>>>：" + pre + encodeToString);
            fileInputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

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