本示例说明了如何使用读取&复制一个文件的内容到另一个文件。FileStreams类的write方法。
import java.io.*; public class Main { public static void main(String[] args) throws Exception { BufferedWriter out1 = new BufferedWriter(new FileWriter("srcfile")); out1.write("string to be copied\n"); out1.close(); InputStream in = new FileInputStream(new File("srcfile")); OutputStream out = new FileOutputStream(new File("destnfile")); byte[] buf = new byte[1024]; int len; while ((len = in.read(buf)) > 0) { out.write(buf, 0, len); } in.close(); out.close(); BufferedReader in1 = new BufferedReader(new FileReader("destnfile")); String str; while ((str = in1.readLine()) != null) { System.out.println(str); } in.close(); } }
上面的代码示例将产生以下结果。
string to be copied
以下是在Java中将一个文件复制到另一个文件中的另一个简单示例
import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; public class CopyExample { public static void main(String[] args) { FileInputStream ins = null; FileOutputStream outs = null; try { File infile =new File("C:\\Users\\nhooo7\\Desktop\\abc.txt"); File outfile =new File("C:\\Users\\nhooo7\\Desktop\\bbc.txt"); ins = new FileInputStream(infile); outs = new FileOutputStream(outfile); byte[] buffer = new byte[1024]; int length; while ((length = ins.read(buffer)) > 0) { outs.write(buffer, 0, length); } ins.close(); outs.close(); System.out.println("File copied successfully!!"); } catch(IOException ioe) { ioe.printStackTrace(); } } }
上面的代码示例将产生以下结果。
File copied successfully!!