通过BufferedReader的readLine()遍历或者lines()获取Stream后进行流处理,都可以用BufferedReader完成文件内容的遍历读取,上面在程序代码和注释里我们演示了两种遍历BufferedReader的方法。
public boolean processLine(String line) throws IOException { String newLine = ""; //file中的 line数据格式:name,age,address -> NAME,AGE,ADDRESS, String[] contents = line.split(","); for (int i=0;i newLine.concat(contents[i].toLowerCase()); } lines.add(newLine); //将处理后的数...
reader=newInputStreamReader(newFileInputStream(fileName));//读入多个字符到字符数组中,charread为一次读取字符数while((charread = reader.read(tempchars)) != -1) {//同样屏蔽掉\r不显示if((charread ==tempchars.length)&& (tempchars[tempchars.length - 1] != '\r')) { System.out.print(temp...
String currentLine = reader.readLine(); reader.close(); assertEquals(expected_value, currentLine); } Note that readLine() will return null when the end of the file is reached. 3. Read with Scanner Next, let’s use a Scanner to read from the File – the file contains: 1 Hello world ...
PathfilePath=Paths.get("c:/temp","data.txt");List<String>lines=Files.readAllLines(filePath);for(Stringline:lines){System.out.println(line);} 4. Reading a File Line by Line usingFileReader[Legacy] Till Java 7, we could read a file usingFileReaderin various ways. This has been mentioned...
Read all lines from a file. 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. Bytes from the file are decoded into characters using the specified charset. This method recognizes the following as line terminato...
从上面看出,readLine()是调用了read(char[] cbuf, int off, int len) 来读取数据,后面再根据"/r"或"/n"来进行数据处理。 在Java I/O书上也说了: public String readLine() throws IOException This method returns a string that contains a line of text from a text file. /r, /n, and /r/n ...
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 复制 importjava.io.BufferedReader;importjava.io.FileReader;importjava.io.IOException;publicclassReadFileToString{publicstati...
Opens a file, returning an input stream to read from the file. static OutputStream newOutputStream(Path path, OpenOption... options) Opens or creates a file, returning an output stream that may be used to write bytes to the file. static boolean notExists(Path path, LinkOption... options...
publicclassReadFileLineByLineUsingBufferedReader{publicstaticvoidmain(String[]args){BufferedReaderreader;try{reader=newBufferedReader(newFileReader("sample.txt"));Stringline=reader.readLine();while(line!=null){System.out.println(line);// read next lineline=reader.readLine();}reader.close();}catch(...