Android解压sd卡里面Zip压缩文件

来源：互联网发布：编曲软件排名编辑：程序博客网时间：2024/06/12 01:03

1.权限 <uses-permission Android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> 写SD卡的权限非常重要。

2.直接使用这个类就好了。

package com.example.testdemo;import java.io.File;import java.io.BufferedOutputStream;import java.io.BufferedInputStream;import java.io.FileOutputStream;import java.io.FileInputStream;import java.util.zip.ZipEntry;import java.util.zip.ZipInputStream;import java.util.zip.ZipOutputStream;/** * 该类实现文件夹压缩成zip文件和zip文件解压 * @author Administrator * */public class Zip{     private ZipInputStream  zipIn;      //解压Zip     private ZipOutputStream zipOut;     //压缩Zip     private ZipEntry        zipEntry;     private static int      bufSize;    //size of bytes     private byte[]          buf;     private int             readedBytes;          public Zip(){         this(512);     }     public Zip(int bufSize){         this.bufSize = bufSize;         this.buf = new byte[this.bufSize];     }          //压缩文件夹内的文件     public void doZip(String zipDirectory){//zipDirectoryPath:需要压缩的文件夹名         File file;         File zipDir;         zipDir = new File(zipDirectory);         String zipFileName = zipDirectory + ".zip";//压缩后生成的zip文件名         try{             this.zipOut = new ZipOutputStream(new BufferedOutputStream(new FileOutputStream(zipFileName)));             handleDir(zipDir , this.zipOut);             this.zipOut.close();         }catch(Exception ioe){             ioe.printStackTrace();         }     }     //由doZip调用,递归完成目录文件读取    private void handleDir(File dir , ZipOutputStream zipOut)throws Exception{         FileInputStream fileIn;         File[] files;         files = dir.listFiles();         if(files.length == 0){//如果目录为空,则单独创建之.             //ZipEntry的isDirectory()方法中,目录以"/"结尾.             this.zipOut.putNextEntry(new ZipEntry(dir.toString() + "/"));             this.zipOut.closeEntry();         }         else{//如果目录不为空,则分别处理目录和文件.             for(File fileName : files){                 if(fileName.isDirectory()){                     handleDir(fileName , this.zipOut);                 }                 else{                     fileIn = new FileInputStream(fileName);                    String name=dir.getName();                    //生成的压缩包存放在原目录下                    this.zipOut.putNextEntry(new ZipEntry(name+"/"+fileName.getName().toString()));                                        //此方法存放在该项目目录下                    //this.zipOut.putNextEntry(new ZipEntry(fileName.toString()));                    while((this.readedBytes=fileIn.read(this.buf))>0){                        this.zipOut.write(this.buf , 0 , this.readedBytes);                    }                    this.zipOut.closeEntry();                 }             }         }     }     //解压指定zip文件     public void unZip(String unZipfileName){//unZipfileName需要解压的zip文件名         FileOutputStream fileOut;         File file;         String f=unZipfileName.substring(0, unZipfileName.length()-4);        File ff=new File(f);        try{             this.zipIn = new ZipInputStream (new             BufferedInputStream(new FileInputStream(unZipfileName)));             while((this.zipEntry = this.zipIn.getNextEntry()) != null){                 file = new File(this.zipEntry.getName());                 if(this.zipEntry.isDirectory()){                     file.mkdirs();                 }                 else{                     //如果指定文件的目录不存在,则创建之.                     File parent = file.getParentFile();                     if(!parent.exists()){                         parent.mkdirs();                     }                     if(!ff.exists()){                    ff.mkdir();                    }                    fileOut = new FileOutputStream(f+"/"+file.getName());                                         //fileOut = new FileOutputStream(file); 此方法存放到该项目目录下                    while(( this.readedBytes = this.zipIn.read(this.buf) ) > 0){                         fileOut.write(this.buf , 0 , this.readedBytes );                     }                     fileOut.close();                 }                                this.zipIn.closeEntry();            }        }catch(Exception ioe){            ioe.printStackTrace();         }    }     //设置缓冲区大小     public void setBufSize(int bufSize){         this.bufSize = bufSize;     }     //测试Zip类     public static void main(String[] args)throws Exception{         Zip zip=new Zip();        zip.doZip("d:\\1234");        zip.unZip("d:\\1234.zip");    } }

3.引用这个类中的方法：

Zip zip = new Zip();Toast.makeText(getApplicationContext(), "ok", 0).show();zip.unZip(Environment.getExternalStorageDirectory()+"/1234.zip");

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