用Java简单实现文件分割与合并
2005-04-06 19:52
1006 查看
主要应用IO的RandomAccessFile(听说断点续传也是用它实现)
import java.io.*;
class Fen{
String fileName;
int size;
Fen(String fileName,String size){
this.fileName = fileName;
this.size = Integer.parseInt(size)*1024;
}
public void cut()throws Exception{
int maxx = 0;
File inFile = new File(fileName);
int fileLength = (int)inFile.length(); //取得文件的大小
int value; //取得要分割的个数
RandomAccessFile inn = new RandomAccessFile(inFile,"r");//打开要分割的文件
value = fileLength/size;
int i=0;
int j=0;
//根据要分割的数目输出文件
for (;j<value;j++){
File outFile = new File(inFile.getName()+j+"zzii");
RandomAccessFile outt= new RandomAccessFile(outFile,"rw");
maxx+=size;
for (;i<maxx;i++){
outt.write(inn.read());
}
outt.close();
}
File outFile = new File(inFile.getName()+j+"zzii");
RandomAccessFile outt= new RandomAccessFile(outFile,"rw");
for(;i<fileLength;i++){
outt.write(inn.read());
}
outt.close();
inn.close();
}
}
class He{
String fileName;
String filterName;
He(String fileName,String filterName){
this.fileName = fileName;
this.filterName = filterName;
}
public void unite()throws Exception{
String [] tt;
File inFile = new File("."); //在当前目录下的文件
File outFile = new File(fileName); //取得输出名
RandomAccessFile outt= new RandomAccessFile(outFile,"rw");
//取得符合条件的文件名
tt = inFile.list(new FilenameFilter(){
public boolean accept(File dir,String name){
String rr = new File(name).toString();
return rr.endsWith(filterName);
}
});
//打印出取得的文件名
for (int i = 0;i<tt.length;i++){
System.out.println(tt[i]);
}
//打开所有的文件再写入到一个文件里
for(int i=0;i<tt.length;i++){
inFile = new File(tt[i]);
RandomAccessFile inn= new RandomAccessFile(inFile,"r");
int c;
while((c=inn.read())!=-1)
outt.write(c);
}
outt.close();
}
}
public class test{
public static void main(final String [] args)throws Exception{
if(args.length==0){
print();
return;
}
if(args[0].equals("-c")){
Fen cutt = new Fen(args[1],args[2]);
cutt.cut();
}
else if (args[0].equals("-r")){
He hee = new He(args[1],args[2]);
hee.unite();
}
else
print();
}
public static void print(){
System.out.println("usage:/n分: java test -c file1 size(单位为K)/n合 java test -r file2 zzii(我设置的方便标识)");
}
}
import java.io.*;
class Fen{
String fileName;
int size;
Fen(String fileName,String size){
this.fileName = fileName;
this.size = Integer.parseInt(size)*1024;
}
public void cut()throws Exception{
int maxx = 0;
File inFile = new File(fileName);
int fileLength = (int)inFile.length(); //取得文件的大小
int value; //取得要分割的个数
RandomAccessFile inn = new RandomAccessFile(inFile,"r");//打开要分割的文件
value = fileLength/size;
int i=0;
int j=0;
//根据要分割的数目输出文件
for (;j<value;j++){
File outFile = new File(inFile.getName()+j+"zzii");
RandomAccessFile outt= new RandomAccessFile(outFile,"rw");
maxx+=size;
for (;i<maxx;i++){
outt.write(inn.read());
}
outt.close();
}
File outFile = new File(inFile.getName()+j+"zzii");
RandomAccessFile outt= new RandomAccessFile(outFile,"rw");
for(;i<fileLength;i++){
outt.write(inn.read());
}
outt.close();
inn.close();
}
}
class He{
String fileName;
String filterName;
He(String fileName,String filterName){
this.fileName = fileName;
this.filterName = filterName;
}
public void unite()throws Exception{
String [] tt;
File inFile = new File("."); //在当前目录下的文件
File outFile = new File(fileName); //取得输出名
RandomAccessFile outt= new RandomAccessFile(outFile,"rw");
//取得符合条件的文件名
tt = inFile.list(new FilenameFilter(){
public boolean accept(File dir,String name){
String rr = new File(name).toString();
return rr.endsWith(filterName);
}
});
//打印出取得的文件名
for (int i = 0;i<tt.length;i++){
System.out.println(tt[i]);
}
//打开所有的文件再写入到一个文件里
for(int i=0;i<tt.length;i++){
inFile = new File(tt[i]);
RandomAccessFile inn= new RandomAccessFile(inFile,"r");
int c;
while((c=inn.read())!=-1)
outt.write(c);
}
outt.close();
}
}
public class test{
public static void main(final String [] args)throws Exception{
if(args.length==0){
print();
return;
}
if(args[0].equals("-c")){
Fen cutt = new Fen(args[1],args[2]);
cutt.cut();
}
else if (args[0].equals("-r")){
He hee = new He(args[1],args[2]);
hee.unite();
}
else
print();
}
public static void print(){
System.out.println("usage:/n分: java test -c file1 size(单位为K)/n合 java test -r file2 zzii(我设置的方便标识)");
}
}
相关文章推荐
- 用Java简单实现文件分割与合并
- JAVA 实现文件分割与合并
- Java 实现大文件的分割与合并
- 用Java实现文件分割/合并操作
- 文件的分割与合并(Java实现)
- Java 实现文件分割,合并功能
- 用java实现大文件分割与合并
- 在Java中实现文件的分割与合并
- java实现文件的分割与合并
- 用Java实现文件分割/合并操作
- Java实现文件分割和文件合并实例
- 用Java实现大文件的分割与合并
- Java中使用IO流实现大文件的分割与合并
- Java 使用IO流实现大文件的分割与合并实例详解
- 用java实现大文件分割、排序、合并
- java实现大文件分割与合并的实例代码
- 用java对文件进行分割与合并
- JAVA 清理垃圾文件简单实现
- java 实现切割文件和合并文件的功能
- Java将文件分割为多个子文件再将子文件合并成原始文件的示例