在上面的示例代码中,readFileToString方法接受文件路径作为参数,并返回文件内容的字符串表示。我们使用BufferedReader逐行读取文件,将每一行添加到StringBuilder中。最后,我们将StringBuilder转换为字符串并返回。 要在main方法中调用readFileToString方法,您需要提供文件的实际路径。请将"path/to/your/file.txt"替换为您要读...
This method ensures that the file is closed when all bytes have been read or an I/O error, or other runtime exception, is thrown. After reading all the bytes, we pass those bytes toStringclass constructor to create a new String. Reading file to byte array PathfilePath=Path.of("c:/tem...
importjava.io.File;importjava.io.FileReader;importjava.io.IOException;publicclassFileToStringExample{publicstaticvoidmain(String[]args){Filefile=newFile("path/to/file.txt");FileReaderfileReader=null;try{fileReader=newFileReader(file);char[]charArray=newchar[(int)file.length()];fileReader.read(charArr...
Learn to read a file to string in Java usingFiles.readString(path)method. This API has been introduced inJava 11. 1. Files.readString() Syntax java.nio.file.Filesclass has two overloaded methods. publicstaticStringreadString(Pathpath)throwsIOExceptionpublicstaticStringreadString(Pathpath,Chars...
Read 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 importjava.nio.file.Path; importjava.nio.file.Paths; importjava.nio.file.Files; importjava.io.IOException; publicclassMain { publicstaticvoidmain(String[] args) ...
@Test void testReadFile4() throws IOException { String fileName = "D:\data\test\newFile3.txt"; // java 11 开始提供的方法,读取文件不能超过2G,与你的内存息息相关 //String s = Files.readString(Paths.get(fileName)); } 5.Files.readAllBytes() 如果你没有JDK11(readAllBytes()始于JDK7),仍...
(FileInputStreamfis=newFileInputStream(source);FileOutputStreamfos=newFileOutputStream(dest)){byte[]buffer=newbyte[1024];intlength;while((length=fis.read(buffer))>0){fos.write(buffer,0,length);}}}publicstaticvoidmain(String[]args)throwsIOException{test_2(newFile("test.txt"),newFile("test...
第一种方式是Scanner,从JDK1.5开始提供的API,特点是可以按行读取、按分割符去读取文件数据,既可以读取String类型,也可以读取Int类型、Long类型等基础数据类型的数据。 @Test void testReadFile1() throws IOException { //文件内容:Hello World|Hello Zimug String fileName = "D:\\data\\test\\newFile4.txt"...
File.getPath(), SecurityManager.checkRead(java.lang.String) FileInputStream public FileInputStream(FileDescriptor fdObj) 使用文件描述符fdObj创建FileInputStream ,该文件描述符表示与文件系统中实际文件的现有连接。 如果有安全管理器,则调用其checkRead方法,并将文件描述符fdObj作为其参数,以查看是否可以读取...
SecurityException, SecurityManager.checkRead(java.lang.String), SecurityManager.checkWrite(java.lang.String) RandomAccessFile public RandomAccessFile(File file, String mode) throws FileNotFoundException 创建随机访问文件流,以读取File参数指定的文件,并可选择写入该文件。 创建一个新的FileDescriptor对象来表...