文件分割器

来源：互联网发布：depthmap软件说明编辑：程序博客网时间：2024/06/02 11:41

先说说思路吧，就是根据所需要分得份数，使用RandomAccessFile移动指针到指定的位置，然后在分别得写入不同的文件…以此抛砖引玉，希望大家多指点…写的不是很完美吧…很多问题还没有考虑到…

Code:

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FilenameFilter;
import java.io.IOException;
import java.io.RandomAccessFile;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;
/**
* 合并功能
* @author Xueqi
*
*/
public class Combine extends JFrame {
private JLabel jl1 = new JLabel("合并文件的位置: ");
private JLabel jl2 = new JLabel("保存文件的位置: ");
private JTextField t1 = new JTextField(40);
private JTextField t2 = new JTextField(40);
private JButton jb1 = new JButton("选择");
private JButton jb2 = new JButton("选择");
private JButton jb3 = new JButton("合并");
private JPanel p1 = new JPanel();
private JPanel p2 = new JPanel();
private JPanel p3 = new JPanel();
private File openF;//要合并的文件
private String openPath;//要合并文件的路径
private File saveF;//要保存到的文件夹
private String savePath;//路径
long end = 0;
String saveName ;
public Combine() {
super("FileSplitters 合并操作");
t1.setEditable(false);
t2.setEditable(false);
p1.add(jl1);
p1.add(t1);
p1.add(jb1);
p2.add(jl2);
p2.add(t2);
p2.add(jb2);
p3.add(jb3);
this.setResizable(false);
this.setBounds(400, 300, 630, 156);
this.add(p1,BorderLayout.NORTH);
this.add(p2,BorderLayout.CENTER);
this.add(p3,BorderLayout.SOUTH);
this.setVisible(true);
open();
save();
combine();
}
private void combine() {
jb3.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
com(openF);
JOptionPane.showMessageDialog(null, "合并完成！/n保存到：" + savePath + "//" + saveName);
}
});
}
private void save() {
jb2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
JFileChooser chooser = new JFileChooser();
chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
int val = chooser.showSaveDialog(null);
saveF = chooser.getSelectedFile();
if(val == JFileChooser.APPROVE_OPTION) {
savePath = saveF.getAbsolutePath();
t2.setText(savePath);
}
}
});
}
private void open() {
jb1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
JFileChooser chooser = new JFileChooser();
chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
int val = chooser.showOpenDialog(null);
openF = chooser.getSelectedFile();
if(val == JFileChooser.APPROVE_OPTION) {
openPath = openF.getAbsolutePath();
t1.setText(openPath);
}
}
});
}
/**
*
* @param openPath 要合并文件所在的文件夹
* @param savePath 将合并的文件保存的位置
*/
public void com(File openF) {
try {
long off = 0;
RandomAccessFile in = null;
File[] f = openF.listFiles(new FilenameFilter() {
public boolean accept(File dir, String name) {
if (name.endsWith(".tmp")) {
return true;
}
return false;
}
});
int num = f.length;// 获取分成了多少份
System.out.println(num);
for(File e :f) {
System.out.println(e.getName());
}
String[] saveTmp = f[0].getName().split("//.");
saveName = saveTmp[0] + "." + saveTmp[1];
for (int i = 0; i < num; i++) {
in = new RandomAccessFile(f[i], "r");
long begin = off;
off = work(saveName, f[i], savePath, begin);
in.close();
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
public long work(String saveName, File f, String savePath, long begin) {
try {
RandomAccessFile in = new RandomAccessFile(f, "r");
RandomAccessFile out = new RandomAccessFile(savePath + "//" + saveName, "rw");
end += in.length();//获取长度
out.seek(begin);//写入文件指针的偏移
byte[] buff = new byte[1024];
int read = 0;
while((read = in.read(buff)) != -1) {
out.write(buff, 0, read);
}
in.close();
out.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return end;
}
}

Code:

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.RandomAccessFile;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;
/**
* 分割功能
* @author Xueqi
*
*/
public class Partition extends JFrame {
private JLabel jl1 = new JLabel("分割文件的位置: ");
private JLabel jl2 = new JLabel("分割文件的份数: ");
private JLabel jl3 = new JLabel("保存文件的位置: ");
private JButton jb1 = new JButton("选择");
private JButton jb2 = new JButton("选择");
private JButton jb3 = new JButton("分割");
private JTextField t1 = new JTextField(40);
private JTextField t2 = new JTextField(5);
private JTextField t3 = new JTextField(40);
private JPanel p1 = new JPanel();
private JPanel p2 = new JPanel();
private JPanel p3 = new JPanel();
private long length = 0;;//文件的长度
private int num = 0;//份数
private File openF;//要分割的文件
private String openPath;//要分割文件的路径
private String openFileName;
private File saveF;//要保存到的文件夹
private String savePath;//路径
public Partition() {
super("FileSplitters 分割操作");
t1.setEditable(false);
t3.setEditable(false);
p1.add(jl1);
p1.add(t1);
p1.add(jb1);
p2.add(jl3);
p2.add(t3);
p2.add(jb2);
p3.add(jl2);
p3.add(t2);
p3.add(new JLabel(" "));
p3.add(jb3);
this.setResizable(false);
this.setBounds(400, 300, 630, 156);
this.add(p1,BorderLayout.NORTH);
this.add(p2,BorderLayout.CENTER);
this.add(p3,BorderLayout.SOUTH);
this.setVisible(true);
chooser();
save();
splitters();
}
private void splitters() {
jb3.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
num = Integer.parseInt(t2.getText());
work(num);
JOptionPane.showMessageDialog(null, "分割完成！/n保存到：" + savePath + " /n 共" + num + "份");
}
});
}
private void save() {
jb2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
JFileChooser chooser = new JFileChooser();
chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
int val = chooser.showSaveDialog(null);
saveF = chooser.getSelectedFile();
if(val == JFileChooser.APPROVE_OPTION) {/////////////////////////
savePath = saveF.toString();
t3.setText(savePath);
}
}
});
}
private void chooser() {
jb1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
JFileChooser chooser = new JFileChooser();
int val = chooser.showOpenDialog(null);
openF = chooser.getSelectedFile();
if(val == JFileChooser.OPEN_DIALOG) {
openPath = openF.getAbsolutePath();
t1.setText(openPath);
openFileName = openF.getName();
}
}
});
}
public void work(int num) {
try {
RandomAccessFile raf = new RandomAccessFile(openPath, "r");
length = raf.length();
raf.close();
long size = length/num;//每份文件的大小
long endPoint = 0;//读取结束时的位置
//先解决最后一个之前的
for(int i = 0; i< num - 1; i++) {
//结束位置是下一个的起始位置
long begin = endPoint;//开始位置
long endLength = (i+1) * size;//读取到的位置
endPoint = spilt(openPath,savePath,i,begin,endLength);//得到末尾位置
}
//解决最后一份
if(length - endPoint >0) {
spilt(openPath,savePath,num - 1,endPoint,length);
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
*
* @param openFile 分割文件的路径
* @param savefile 保存文件的路径
* @param index 第几号文件
* @param begin 指针的起始位置
* @param end 读取到的位置
*/
public long spilt(String openFile, String saveFile, int index, long begin, long end) {//分割方法
long point = 0;
try {
RandomAccessFile in = new RandomAccessFile(openFile, "r");
RandomAccessFile out = new RandomAccessFile(saveFile + "//" + openFileName + "." + index + ".tmp", "rw");
byte[] buuf = new byte[1024];
int read = 0;
//读取文件移动的指针位置
in.seek(begin);
while((in.getFilePointer() <= end) && (read = in.read(buuf)) != -1) {
out.write(buuf, 0, read);
}
point = in.getFilePointer();
in.close();
out.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return point;
}
}