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()); } } }} |
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
