java实现多个文件压缩成压缩包

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

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编程小技巧。

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