public class ReadFile_Files_ReadAllBytes { public static void main(String [] pArgs) throws IOException { String fileName = "c:\\temp\\sample-1GB.txt"; File file = new File(fileName); byte [] fileBytes = Files.r
readUsingBufferedReader(fileName, StandardCharsets.UTF_8); //使用FileReader读取,没有编码支持,效率不高 readUsingFileReader(fileName); } private static void readUsingFileReader(String fileName) throws IOException { File file = new File(fileName); FileReader fr = new FileReader(file); BufferedReader...
public class ReadFile_Files_ReadAllBytes { public static void main(String [] pArgs) throws IOException { String fileName = "c:\\temp\\sample-10KB.txt"; File file = new File(fileName); byte [] fileBytes = Files.readAllBytes(file.toPath()); char singleChar; for(byte b : fileBytes) ...
Reads all the bytes from a file. The method ensures that the file is closed when all bytes have been read or an I/O error, or other runtime exception, is thrown. Note that this method is intended for simple cases where it is convenient to read all bytes into a byte array. It is...
showfile(i.getAbsolutePath(),ext); }else{ if(i.getName().endsWith(ext)){ System.out.println(i.getName()); } } } } } }文件的读取和写入(字节流)对于read(byte[]),返回的结果len,内部应该是这样判断的,首先判断读取的最后一个字节是不是-1,如果不是返回len为插入bytes数据的个数(并不是...
(1)输入流使用实现类Class FileInputStream abstract intread() Reads the next byte of data from the input stream.(每次读一个字节,读取失败返回-1) intread(byte[] b) Reads some number of bytes from the input stream and stores them into the buffer arrayb.(使用字节数组读取,返回读取长度,读取失...
TheFiles.readAllBytesmethod reads all the bytes from a file. It ensures that the file is closed when all bytes have been read. Main.java import java.io.IOException; import java.nio.file.Files; import java.nio.file.Paths; void main() throws IOException { ...
publicstaticvoidreadFileByFiles(String pathname){ Pathpath=Paths.get(pathname); try{ /* * 使用readAllLines的时候,小文件可以很快读取. * 那么更大的文件,读取的肯定会爆了。 */ //List<String> lines = Files.readAllLines(path); byte[] bytes = Files.readAllBytes(path); ...
1、此方法是从输入流中读取一个数据的字节,通俗点讲,即每调用一次read方法,从FileInputStream中读取一个字节。 2、返回下一个数据字节,如果已达到文件末尾,返回-1,这点除看难以理解,通过代码测试理解不难。 3、如果没有输入可用,则此方法将阻塞。这不用多解释,大家在学习的时候,用到的Scannner sc = new Sca...
FileReaderis meant for reading streams of characters. For reading streams of raw bytes, consider using aFileInputStream. Since: JDK1.1 See Also: InputStreamReader,FileInputStream Field Summary Fields inherited from class java.io.Reader lock