File qrFile = new File("./結婚證二維碼.png"); FileInputStream in = new FileInputStream(qrFile); byte[] imageBuffer = in.readAllBytes(); //jdk11 處理方式 //@@ jdk1.8處理方式 byte[] imageBuffer = Files.readAllBytes(Paths.get("結婚證合影.png"));
另外一個例子
1 static String GetFileBase64(String fileName) { 2 try { 3 FileInputStream in = new FileInputStream(fileName); 4 // byte[] fileBuffer = in.readAllBytes(); //jdk11處理方式 5 byte[] fileBuffer = Files.readAllBytes(Paths.get(fileName));//@@ jdk8處理方式
參考
JAVA IO總結:歸納從文件中讀取數據的六種方法https://blog.csdn.net/weixin_48182198/article/details/108382025