jdk11和jdk1.8 readAllBytes方法

 

File qrFile = new File("./结婚证二维码.png");  

FileInputStream in = new FileInputStream(qrFile);

byte[] imageBuffer = in.readAllBytes(); //jdk11 处理方式

            //@@ jdk1.8处理方式
            byte[] imageBuffer = Files.readAllBytes(Paths.get("结婚证合影.png"));

另外一个例子

1     static String GetFileBase64(String fileName) {
2         try {
3             FileInputStream in = new FileInputStream(fileName);
4 //            byte[] fileBuffer = in.readAllBytes(); //jdk11处理方式
5             byte[] fileBuffer = Files.readAllBytes(Paths.get(fileName));//@@ jdk8处理方式

 

参考

JAVA IO总结：归纳从文件中读取数据的六种方法https://blog.csdn.net/weixin_48182198/article/details/108382025