package Ch01;import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;public class Filecopy { /**
* @param args
*/
public static void main(String[] args) {
File file = new File("D:\\test.txt");
if (!file.exists()) {
try{
file.createNewFile();
}catch(IOException e) {
e.printStackTrace();
}
}
BufferedWriter bw = null;
try{
bw = new BufferedWriter(new FileWriter("D:\\test.txt"));
String line = System.getProperty("line.separator");
bw.write("hello world" +line);
}catch(Exception e){
e.printStackTrace();
} finally {
try{
bw.close();
}catch (Exception ex){
ex.printStackTrace();
}
}
public static void copyFile(String src, String dest){
File srcFile = new File(src);
File destPath = new File(dest);
FileInputStream fis = null;
FileOutputStream fos = null;
try {
File destFile = new File(destPath, srcFile.getName());
destFile.createNewFile();
fis = new FileInputStream("D\\test.txt");
fos = new FileOutputStream("E:");
int bytesRead;
byte[] buf = new byte[4*1024];
while ((bytesRead = fis.read(buf)) != -1) {
fos.write(buf, 0, bytesRead);
}
fos.flush();
}catch (IOException e) {
System.out.println(e);
}finally {
try{
fos.close();
fis.close();
}catch (Exception ex) {
ex.printStackTrace();
}
}
}
}
哪儿错了呢 有没有更简单的方法复制文件呢
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;public class Filecopy { /**
* @param args
*/
public static void main(String[] args) {
File file = new File("D:\\test.txt");
if (!file.exists()) {
try{
file.createNewFile();
}catch(IOException e) {
e.printStackTrace();
}
}
BufferedWriter bw = null;
try{
bw = new BufferedWriter(new FileWriter("D:\\test.txt"));
String line = System.getProperty("line.separator");
bw.write("hello world" +line);
}catch(Exception e){
e.printStackTrace();
} finally {
try{
bw.close();
}catch (Exception ex){
ex.printStackTrace();
}
}
public static void copyFile(String src, String dest){
File srcFile = new File(src);
File destPath = new File(dest);
FileInputStream fis = null;
FileOutputStream fos = null;
try {
File destFile = new File(destPath, srcFile.getName());
destFile.createNewFile();
fis = new FileInputStream("D\\test.txt");
fos = new FileOutputStream("E:");
int bytesRead;
byte[] buf = new byte[4*1024];
while ((bytesRead = fis.read(buf)) != -1) {
fos.write(buf, 0, bytesRead);
}
fos.flush();
}catch (IOException e) {
System.out.println(e);
}finally {
try{
fos.close();
fis.close();
}catch (Exception ex) {
ex.printStackTrace();
}
}
}
}
哪儿错了呢 有没有更简单的方法复制文件呢
**编写一个文件拷贝程序,将文件C:\test1.txt的内容拷贝到C:\test2.txt中
*/
import java.io.*;
class CopyFile{
public static void main(String[] args) {
String file1 = “C:\test1.txt”;
String file2 = “C:\test2.txt”;
int ch = 0 ;
try {
FileInputStream fis = new FileInputStream(file1);
FileOutputStream fos=new FileOutputStream(file2);
while ((ch=fis.read())!=-1)
fos.write(ch);
fis.close();
fos.close();
}
catch (IOException e){
System.out.println(e.toString());
}
}
}当然这样做的前提是,两个文件必须存在
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;public class CopyFile {
public void copy(String srcName, String destName) {
File src = new File(srcName);
if (src == null || !src.isFile()) {
System.out.println("源文件不存在");
return;
}
File dest = new File(destName);
InputStream input = null;
OutputStream out = null;
try {
input = new FileInputStream(src);
out = new FileOutputStream(dest);
byte[] data = new byte[1024 * 512];
int temp = 0;
while ((temp = input.read(data)) != -1) {
out.write(data, 0, temp);
}
out.close();
input.close();
System.out.println("文件复制成功");
} catch (Exception e) {
System.err.println("文件复制失败:" + e.getMessage());
e.printStackTrace();
}
} public static void main(String[] args) {
new CopyFile().copy("./test.txt", "./123.txt");
}
}