如何用Java把一个文本中指定信息复制到另一个文本中

如何用Java把一个文本中指定信息复制到另一个文本中

JTextField t1 = new JTextField();
JTextField t2 = new JTextField();

t2.setText(t1.getText());

import java.io.bufferedreader; import java.io.bufferedwriter; import java.io.file; import java.io.fileinputstream; import java.io.fileoutputstream; import java.io.inputstreamreader; import java.io.outputstreamwriter; public class replacetext { public static void main(string[] args ) throws exception { file source = new file("d:/abc.txt"); bufferedreader in = new bufferedreader(new inputstreamreader(new fileinputstream(source))); file desc = new file("d:/a.txt"); bufferedwriter out = new bufferedwriter(new outputstreamwriter(new fileoutputstream(desc))); string str = null; while ((str = in.readline()) != null) { out.write(str + "\r\n"); } out.close(); in.close(); } }

你好: 从A读取到B中: import java.io.*; public class IoDemo{     public static void main(String[] args)throws Exception{         String str = "";         File file1 = new File("D:\\A.txt");         File file2 = new File("D:\\B.txt");         BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(file1),"UTF-8"));         //读取         while (br.read()!=-1) { str += br.readLine(); }         br.close();         br = new BufferedReader(new FileReader(file2));         str += br.readLine();         br.readLine();         //写入         BufferedWriter bw = new BufferedWriter(new FileWriter(file2));         bw.write(str);         bw.close();     } }

public static void copy() throws Exception{ FileInputStream fis = new FileInputStream("目录"); byte [] b = new byte[1024]; int n; FileOutputStream fos = new FileOutputStream("目标位置"); while((n=fis.read(b))!=-1){ fos.write(b, 0, n); } fos.close(); fis.close(); }