JAVA IO字节流读取文件文本

public static void read(String filePath){
    try(FileInputStream file = new FileInputStream(filePath)) {

        StringBuilder sb = new StringBuilder();
        int tem = 0;

        while ((tem=file.read())!=-1){
            sb.append((char) tem);
        }

        System.out.println(sb);

    } catch (FileNotFoundException e) {
        throw new RuntimeException(e);
    } catch (IOException e) {
        throw new RuntimeException(e);
    }
}