ZipToFile.java

package com.pps.utils;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipException;
import java.util.zip.ZipFile;
import java.util.zip.ZipInputStream;
/** 
 * 解压ZIP压缩文件到指定的目录 
 * @author jiangqq 
 * @since 2013-9 8:57:18 
 */  
public final class ZipToFile {  
    /** 
     * 缓存区大小默认20480 
     */  
    private final static int FILE_BUFFER_SIZE = 20480;  
      
    private ZipToFile() {  
          
    }       
    /** 
     * 将指定目录的ZIP压缩文件解压到指定的目录 
     * @param zipFilePath       ZIP压缩文件的路径 
     * @param zipFileName       ZIP压缩文件名字 
     * @param targetFileDir     ZIP压缩文件要解压到的目录 
     * @return flag             布尔返回值 
     */  
    public static boolean unzip(String zipFilePath, String zipFileName, String targetFileDir){  
        boolean flag = false;  
        //1.判断压缩文件是否存在，以及里面的内容是否为空  
        File file = null;           //压缩文件(带路径)  
        ZipFile zipFile = null;  
        file = new File(zipFilePath + "/" + zipFileName);  
        System.out.println(">>>>>>解压文件【" + zipFilePath + "/" + zipFileName + "】到【" + targetFileDir + "】目录下<<<<<<");  
        if(false == file.exists()) {  
            System.out.println(">>>>>>压缩文件【" + zipFilePath + "/" + zipFileName + "】不存在<<<<<<");  
            return false;  
        } else if(0 == file.length()) {  
            System.out.println(">>>>>>压缩文件【" + zipFilePath + "/" + zipFileName + "】大小为0不需要解压<<<<<<");  
            return false;  
        } else {  
            //2.开始解压ZIP压缩文件的处理  
            byte[] buf = new byte[FILE_BUFFER_SIZE];  
            int readSize = -1;  
            ZipInputStream zis = null;  
            FileOutputStream fos = null;  
            try {  
                // 检查是否是zip文件  
                zipFile = new ZipFile(file);  
                zipFile.close();  
                // 判断目标目录是否存在，不存在则创建  
                File newdir = new File(targetFileDir);  
                if (false == newdir.exists()) {  
                    newdir.mkdirs();  
                    newdir = null;  
                }  
                zis = new ZipInputStream(new FileInputStream(file));  
                ZipEntry zipEntry = zis.getNextEntry();  
                // 开始对压缩包内文件进行处理  
                while (null != zipEntry) {  
                    String zipEntryName = zipEntry.getName().replace('\\', '/');  
                    //判断zipEntry是否为目录，如果是，则创建  
                    if(zipEntry.isDirectory()) {  
                        int indexNumber = zipEntryName.lastIndexOf('/');  
                        File entryDirs = new File(targetFileDir + "/" + zipEntryName.substring(0, indexNumber));  
                        entryDirs.mkdirs();  
                        entryDirs = null;  
                    } else {  
                        try {  
                            fos = new FileOutputStream(targetFileDir + "/" + zipEntryName);  
                            while ((readSize = zis.read(buf, 0, FILE_BUFFER_SIZE)) != -1) {  
                                fos.write(buf, 0, readSize);  
                            }  
                        } catch (Exception e) {  
                            e.printStackTrace();  
                            throw new RuntimeException(e.getCause());   
                        } finally {  
                            try {  
                                if (null != fos) {  
                                    fos.close();  
                                }  
                            } catch (IOException e) {  
                                e.printStackTrace();  
                                throw new RuntimeException(e.getCause());   
                            }  
                        }  
                    }  
                    zipEntry = zis.getNextEntry();  
                }  
                flag = true;  
            } catch (ZipException e) {  
                e.printStackTrace();  
                throw new RuntimeException(e.getCause());   
            } catch (IOException e) {  
                e.printStackTrace();  
                throw new RuntimeException(e.getCause());   
            } finally {  
                try {  
                    if (null != zis) {  
                        zis.close();  
                    }  
                    if (null != fos) {  
                        fos.close();  
                    }  
                } catch (IOException e) {  
                    e.printStackTrace();  
                    throw new RuntimeException(e.getCause());   
                }  
            }  
        }  
        return flag;  
    }  
  
    /** 
     * 测试用的Main方法 
     */  
    public static void main(String[] args) {  
        String zipFilePath = "C:\\home";  
        String zipFileName = "141.xml.zip";  
        String targetFileDir = "C:\\home\\141.xml";  
        boolean flag = ZipToFile.unzip(zipFilePath, zipFileName, targetFileDir);  
        if(flag) {  
            System.out.println(">>>>>>解压成功<<<<<<");  
        } else {  
            System.out.println(">>>>>>解压失败<<<<<<");  
        }  
    }  
  
}