Java实现ZIP解压功能
1.引入依赖
<dependency><groupId>org.apache.ant</groupId>
<artifactId>ant</artifactId>
<version>1.9.6</version>
</dependency>
2.Java代码
public class ZipUtils {private static Logger logger = LoggerFactory.getLogger(ZipUtils.class);
/**
*ZIP文件解压操作类
* @param path 解压的ZIP源文件路径 必须
* @param goalPath 解压的目标文件夹路径 非必须
* @param perFileName 解压文件的文件名前缀 非必须
* @return 返回解压图片和图片路径
* @throws Exception
*/
public static HashMap<String,String> unZip(String path, String goalPath, String perFileName) throws Exception{
int count = -1;
int index = -1;
String savePath = "";
InputStream in = null;
FileOutputStream fos = null;
BufferedOutputStream bos = null;
String goal_fileName ="";
int bufLength = 1024;
byte[] b = null;
HashMap<String,String> fileNameMap = new HashMap<String, String>();
try {
logger.debug("--解压缩文件:"+path);
ZipFile localFile = new ZipFile(path);
Enumeration<?> entries = localFile.getEntries();
while(entries.hasMoreElements()){
byte[] buf = new byte[bufLength];
ZipEntry tmpEntry = (ZipEntry) entries.nextElement();
String fileName = tmpEntry.getName();
// 得到文件的扩展名
String file_ext_name = fileName.substring(fileName.lastIndexOf(".") + 1);
if(file_ext_name.equals("jpg")||file_ext_name.equals("jpeg")||file_ext_name.equals("png")||file_ext_name.equals("gif")
||file_ext_name.equals("bmp")){
// 设置文件解压缩目标文件夹
if(goalPath!=null&&goalPath.length()!=0){
savePath = goalPath+ "/";
}else{
savePath = path.substring(0, path.lastIndexOf(".")) + "/";
}
File unZipFile = new File(savePath);
if(!unZipFile.exists()){
unZipFile.mkdir();
logger.debug("--解压缩输出目标文件夹不存在,创建目标文件夹"+savePath);
}
// 组装解压的目标文件
if(perFileName!=null&&perFileName.length()!=0){
goal_fileName = perFileName+"_"+fileName;
}else{
goal_fileName = fileName;
}
// 上传的图片格式
fileName = savePath + goal_fileName;
logger.debug("--解压文件:"+fileName);
File file = new File(fileName);
file.createNewFile();
in = localFile.getInputStream(tmpEntry);
fos = new FileOutputStream(file);
bos = new BufferedOutputStream(fos,bufLength);
while((count = in.read(buf))>-1){
bos.write(buf,0,count);
}
fileNameMap.put(goal_fileName,fileName);
bos.flush();
// 关闭资源
closeResource(bos,fos,in);
// 如果是gif格式的图片,则生成临时gif文件,并获取gif图片的第一帧
if (file_ext_name.trim().equals("gif")|| file_ext_name.trim().equals("GIF")) {
logger.debug("####上传的图片格式为:file_ext_name:"+file_ext_name);
// 临时文件夹
String tmpUrl = goalPath + "/gifTmp";
File gifTmpFiles = new File(tmpUrl);
if (!gifTmpFiles.exists()) {
gifTmpFiles.mkdirs();
}
// 临时gif图片
File gifTmpFile = new File(tmpUrl, goal_fileName);
File gifLocalFile = new File(fileName);
FileUtil.copyFile(gifLocalFile, gifTmpFile);
// 获取gif图片的第一帧
try{
b = ImageUtils.returnGifFirstByte(gifTmpFile.getAbsolutePath());
}catch (Exception e){
logger.error("--获取gif图片的第一帧失败",e);
throw new Exception(e);
}
// 删除临时gif图片
logger.debug("####删除GIF文件临时文件:gifTmpFile:"+gifTmpFile.getAbsolutePath());
gifTmpFile.delete();
logger.debug("####删除GIF本地解压文件:gifLocalFile:"+gifLocalFile.getAbsolutePath());
//删除原始本地GIF图片
gifLocalFile.delete();
// 保存原图片
if (b == null || b.length <= 0) {
logger.error("GIF文件为空,解压失败!"+fileName);
throw new Exception("gif fail");
}else{
fileName = fileName.substring(0,fileName.lastIndexOf("."))+".jpg";
logger.debug("####GIF文件转换为本地JPG文件:fileName:"+fileName);
FileOutputStream out = new FileOutputStream(fileName);
out.write(b);
out.close();
}
}
fileNameMap.put(goal_fileName,fileName);
}else{
logger.error("#####文件格式不合法,拒绝解压缩!fileName:"+fileName);
}
}
// 删除解压缩文件
Util.delUrlLocalFile(path);
try {
if(localFile!=null){
localFile.close();
}
} catch (IOException e) {
logger.error("localFile关闭失败!",e);
localFile.close();
}
} catch (Exception e) {
logger.error("zip文件解压失败!",e);
throw new Exception(e);
}
return fileNameMap;
}
public static void closeResource(BufferedOutputStream bos,FileOutputStream fos,InputStream in){
try{
if(bos!=null){
bos.close();
}
}catch(Exception e){
logger.error("BufferedOutputStream关闭失败!",e);
}
try{
if(fos!=null){
fos.close();
}
}catch(Exception e){
logger.error("FileOutputStream关闭失败!",e);
}
try{
if(in!=null){
in.close();
}
}catch(Exception e){
logger.error("inputstream关闭失败!",e);
}
}
}
由于涉及的业务是图片的打包文件,代码仅写了图片文件的解压。
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