本文实例为大家分享了java实现多个文件压缩的具体代码，供大家参考，具体内容如下
需要用到的ant.jar
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package util;
import java.io.bufferedinputstream;
import java.io.bufferedoutputstream;
import java.io.file;
import java.io.fileinputstream;
import java.io.fileoutputstream;
import java.io.inputstream;
import java.io.outputstream;
import java.util.arraylist;
import java.util.enumeration;
import java.util.list;
import java.util.zip.zipentry;
import java.util.zip.zipfile;
import java.util.zip.zipoutputstream;
public class ziptools {
public static final string zip_filename = ""; //需要解压缩的文件名
public static final string zip_dir = ""; //需要压缩的文件夹
public static final string un_zip_dir = ""; //要解压的文件目录
public static final int buffer = 1024 ; //缓存大小
public static void zipfile(string basedir,string filename) throws exception{
list filelist=getsubfiles(new file(basedir));
zipoutputstream zos=new zipoutputstream(new fileoutputstream(filename));
zipentry ze=null;
byte[] buf=new byte[buffer];
int readlen=0;
for(int i = 0; i <filelist.size(); i++) {
file f=(file)filelist.get(i);
ze=new zipentry(getabsfilename(basedir, f));
ze.setsize(f.length());
ze.settime(f.lastmodified());
zos.putnextentry(ze);
inputstream is=new bufferedinputstream(new fileinputstream(f));
while ((readlen=is.read(buf, 0, buffer))!=-1) {
zos.write(buf, 0, readlen);
}
is.close();
}
zos.close();
}
private static string getabsfilename(string basedir, file realfilename){
file real=realfilename;
file base=new file(basedir);
string ret=real.getname();
while (true) {
real=real.getparentfile();
if(real==null)
break;
if(real.equals(base))
break;
else
ret=real.getname()+"/"+ret;
}
return ret;
}
private static list getsubfiles(file basedir){
list ret=new arraylist();
file[] tmp=basedir.listfiles();
for (int i = 0; i <tmp.length; i++) {
if(tmp[i].isfile())
ret.add(tmp[i]);
if(tmp[i].isdirectory())
ret.addall(getsubfiles(tmp[i]));
}
return ret;
}
public static void upzipfile() throws exception{
zipfile zfile=new zipfile(zip_filename);
enumeration zlist=zfile.entries();
zipentry ze=null;
byte[] buf=new byte[1024];
while(zlist.hasmoreelements()){
ze=(zipentry)zlist.nextelement();
if(ze.isdirectory()){
file f=new file(zip_dir+ze.getname());
f.mkdir();
continue;
}
outputstream os=new bufferedoutputstream(new fileoutputstream(getrealfilename(zip_dir, ze.getname())));
inputstream is=new bufferedinputstream(zfile.getinputstream(ze));
int readlen=0;
while ((readlen=is.read(buf, 0, 1024))!=-1) {
os.write(buf, 0, readlen);
}
is.close();
os.close();
}
zfile.close();
}
public static file getrealfilename(string basedir, string absfilename){
string[] dirs=absfilename.split("/");
file ret=new file(basedir);
if(dirs.length>1){
for (int i = 0; i < dirs.length-1;i++) {
ret=new file(ret, dirs[i]);
}
if(!ret.exists())
ret.mkdirs();
ret=new file(ret, dirs[dirs.length-1]);
return ret;
}
return ret;
}
public static void deletedirfile(string path){
file file=new file(path);
if(file.isdirectory()){ //如果是目录，先递归删除
string[] list=file.list();
for(int i=0;i<list.length;i++){
deletedirfile(path+"\\"+list[i]); //先删除目录下的文件
}
}
file.delete();
}
public static string newfolder(string dir){
java.io.file myfilepath=new java.io.file(dir);
if(myfilepath.isdirectory()){}else{
myfilepath.mkdirs();
}
return dir;
}
public static string getfilenames(string path){
file file = new file(path); // get file list where the path has
file[] array = file.listfiles(); // 获得文件列表
string pdfnames="";
for(int i=0;i<array.length;i++){
if(array[i].isfile()){
if(array[i].getname().endswith(".pdf")){ //获得pdf文件名称
pdfnames+=array[i].getname().substring(0,array[i].getname().length()-4)+",";
}
}
}
if(pdfnames.length()>0){
pdfnames.substring(0,pdfnames.length()-1);
}
return pdfnames;
}
public static void copyfile(string oldpath, string newpath) {
try {
int bytesum = 0;
int byteread = 0;
file oldfile = new file(oldpath);
if (oldfile.exists()) { //文件存在时
inputstream instream = new fileinputstream(oldpath); //读入原文件
fileoutputstream fs = new fileoutputstream(newpath);
byte[] buffer = new byte[1444];
while ( (byteread = instream.read(buffer)) != -1) {
bytesum += byteread; //字节数文件大小
fs.write(buffer, 0, byteread);
}
instream.close();
}
}
catch (exception e) {
system.out.println("copy file error!");
e.printstacktrace();
}
}
public static boolean fileexist(string filenames,string pdfname){
boolean flag=false;
if(!"".equals(filenames)){
string[] namearr=filenames.split(",");
for(int i=0;i<namearr.length;i++){
if(pdfname.equals(namearr[i])){ //如果文件名相同则执行拷贝操作(拷贝到zip目录准备打包)
flag=true;
break;
}
}
}
return flag;
}
public static void deletefileanddir(string path){
file file = new file(path);
file[] array = file.listfiles();
for(int i=0;i<array.length;i++){
if(array[i].isfile()){
array[i].delete();
}else if(array[i].isdirectory()){
deletedirfile(array[i].getpath());
}
}
}
}
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以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/NFA_YY/article/details/73613406