Java FileReader和FileWriter示例

FileReader和FileWriter分别是用于读写字符文件的便捷类。 FileReader和FileWriter类都使用系统的默认编码。

以下示例显示了FileReader和FileWriter的用法。

文件：FileReaderWriterExample.java –

package com.yiibai.tutorial.io;  import java.io.File; import java.io.FileReader; import java.io.FileWriter; import java.io.IOException;  /**  * @author yiibai  */ public class FileReaderWriterExample {     public static void main(String[] args) {         File file = new File("file.txt");          /* Writing File Using FileWriter */         FileWriter fileWriter = null;         try {             fileWriter = new FileWriter(file);             fileWriter.write("This is an example of using");             fileWriter.write(" FileReader and ");             fileWriter.write(" FileWriter. ");         } catch (IOException e) {             e.printStackTrace();         } finally {             try {                 if (fileWriter != null) {                     fileWriter.close();                 }             } catch (Exception e) {                 e.printStackTrace();             }         }          /* Reading File Using FileReader */         FileReader fileReader = null;         try {             fileReader=new FileReader(file);             char ch[]=new char[20];             int i=0;             while((i=fileReader.read(ch))!=-1){                 System.out.println(new String(ch,0,i));             }         } catch (IOException e) {             e.printStackTrace();         }finally {             try {                 if (fileReader != null) {                     fileReader.close();                 }             } catch (IOException e) {                 e.printStackTrace();             }         }     } } 

执行上面示例代码，得到以下结果：

This is an example o f using FileReader a nd  FileWriter.