1. 创建字符输入流对象 → public FileReader (File file) 或者 public FileReader (String pathname) 细节:如果文件不存在,就直接报错 2. 读取数据 public int read () → 读取数据,读到末尾返回 -1 public int read (char[] buffer) → 读取多个数据,读到末尾返回 -1 细节:①字符流的底层是字节流,空参...
How to read ini file using Java import java.io.BufferedReader; import java.io.FileReader; import java.io.IOException; import java.util.HashMap; import java.util.Properties; public class iniReader { protected HashMap<String, Properties> sections = new HashMap<String, Properties>(); private tra...
packagecom.journaldev.readfileslinebyline;importjava.io.BufferedReader;importjava.io.FileReader;importjava.io.IOException;publicclassReadFileLineByLineUsingBufferedReader{publicstaticvoidmain(String[]args){BufferedReaderreader;try{reader=newBufferedReader(newFileReader("sample.txt"));Stringline=reader.readLine...
BufferedReader reader = new BufferedReader(new FileReader(file)); String currentLine = reader.readLine(); reader.close(); assertEquals(expected_value, currentLine); } Note thatreadLine()will returnnullwhen the end of the file is reached. 5. Reading from a File Using Java NIO In JDK7, the...
Main.java import java.io.BufferedReader; import java.io.FileReader; import java.io.IOException; import java.nio.charset.StandardCharsets; void main() throws IOException { var fileName = "src/main/resources/thermopylae.txt"; try (BufferedReader br = new BufferedReader( new FileReader(fileName, ...
Till Java 7, we could read a file usingFileReaderin various ways. This has been mentioned for reference only, and shall not be used in Java 8 or later, as it provides no additional benefit for this usecase. Filefile=newFile("c:/temp/data.txt");try(FileReaderfr=newFileReader(file);Buf...
If you are still not using java 7 or later, then useBufferedReaderclass. It’sreadLine()method reads the file one line at a time and return the content. 代码语言:javascript 代码运行次数:0 复制 Cloud Studio代码运行 importjava.io.BufferedReader;importjava.io.FileReader;importjava.io.IOException...
Note: In order to run this file, you should have a file named input.txt in your current working directory. Example 2: Java Program to Read File Using BufferedReader import java.io.FileReader; import java.io.BufferedReader; class Main { public static void main(String[] args) { // Creates...
import java.io.FileReader; import java.io.IOException; /** * Read contents of a File line by line using BufferedReader * www.tutorialkart.com */ public class Example { public static void main(String args[]){ String filename = "samplefile.txt"; ...
(newFileReader("C:\\Users\\91911\\Desktop\\test.txt"));22//第一种读取文件方式23System.out.println("Reading the file using readLine() method: ");24String contentLine ;25List<String> arr1 =newArrayList<>();26while((contentLine = br.readLine()) !=null) {27//contentLine = br....