提供用于读取,写入和复制文件的实用程序方法.这些方法适用于InputStream,OutputStream,Reader和Writer.
以下是 org.apache.commons的声明. io.IOUtils Class :
public class IOUtils extends Object
为输入/输出操作提供静态实用程序方法.
toXXX() : 从流中读取数据.
write() : 将数据写入流.
copy() : 将所有数据复制到流到另一个流.
contentEquals : 比较两个流的内容.
这是我们需要解析的输入文件 :
Welcome to TutorialsPoint. Simply Easy Learning.
IOTester.java
import java.io.BufferedReader; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import org.apache.commons.io.IOUtils; public class IOTester { public static void main(String[] args) { try { //Using BufferedReader readUsingTraditionalWay(); //Using IOUtils readUsingIOUtils(); } catch(IOException e) { System.out.println(e.getMessage()); } } //reading a file using buffered reader line by line public static void readUsingTraditionalWay() throws IOException { try(BufferedReader bufferReader = new BufferedReader( new InputStreamReader( new FileInputStream("input.txt") ) )) { String line; while( ( line = bufferReader.readLine() ) != null ) { System.out.println( line ); } } } //reading a file using IOUtils in one go public static void readUsingIOUtils() throws IOException { try(InputStream in = new FileInputStream("input.txt")) { System.out.println( IOUtils.toString( in , "UTF-8") ); } } }
它将打印以下内容结果.
Welcome to TutorialsPoint. Simply Easy Learning. Welcome to TutorialsPoint. Simply Easy Learning.