java实现多个文件压缩成压缩包

时间:2022-09-12 13:04:58

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