1.情景展示
java實現將文件夾進行壓縮打包的功能及在線解壓功能
2.解決方案
方式一：壓縮、解壓zip
准備工作：slf4j-api.jar
<!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-api -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.25</version>
</dependency>
如果不需要日志記錄，則可以把log去掉。
導入
import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.nio.charset.Charset; import java.util.Enumeration; import java.util.zip.ZipEntry; import java.util.zip.ZipFile; import java.util.zip.ZipOutputStream; import org.slf4j.Logger; import org.slf4j.LoggerFactory;
壓縮成zip
/**
* 文件壓縮、解壓工具類
*/
public class ZipUtils {
private static final int BUFFER_SIZE = 2 * 1024;
/**
* 是否保留原來的目錄結構
* true: 保留目錄結構;
* false: 所有文件跑到壓縮包根目錄下(注意：不保留目錄結構可能會出現同名文件,會壓縮失敗)
*/
private static final boolean KeepDirStructure = true;
private static final Logger log = LoggerFactory.getLogger(ZipUtils.class);
public static void main(String[] args) {
try {
// toZip("D:\\apache-maven-3.5.3\\maven中央倉庫-jar下載", "D:\\apache-maven-3.5.3\\maven中央倉庫-jar下載.zip",true);
unZipFiles("D:\\\\apache-maven-3.5.3\\\\maven中央倉庫-jar下載.zip","D:\\apache-maven-3.5.3\\maven中央倉庫-jar下載");
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 壓縮成ZIP
* @param srcDir 壓縮 文件/文件夾 路徑
* @param outPathFile 壓縮 文件/文件夾 輸出路徑+文件名 D:/xx.zip
* @param isDelSrcFile 是否刪除原文件: 壓縮前文件
*/
public static void toZip(String srcDir, String outPathFile,boolean isDelSrcFile) throws Exception {
long start = System.currentTimeMillis();
FileOutputStream out = null;
ZipOutputStream zos = null;
try {
out = new FileOutputStream(new File(outPathFile));
zos = new ZipOutputStream(out);
File sourceFile = new File(srcDir);
if(!sourceFile.exists()){
throw new Exception("需壓縮文件或者文件夾不存在");
}
compress(sourceFile, zos, sourceFile.getName());
if(isDelSrcFile){
delDir(srcDir);
}
log.info("原文件:{}. 壓縮到:{}完成. 是否刪除原文件:{}. 耗時:{}ms. ",srcDir,outPathFile,isDelSrcFile,System.currentTimeMillis()-start);
} catch (Exception e) {
log.error("zip error from ZipUtils: {}. ",e.getMessage());
throw new Exception("zip error from ZipUtils");
} finally {
try {
if (zos != null) {zos.close();}
if (out != null) {out.close();}
} catch (Exception e) {}
}
}
/**
* 遞歸壓縮方法
* @param sourceFile 源文件
* @param zos zip輸出流
* @param name 壓縮后的名稱
*/
private static void compress(File sourceFile, ZipOutputStream zos, String name)
throws Exception {
byte[] buf = new byte[BUFFER_SIZE];
if (sourceFile.isFile()) {
zos.putNextEntry(new ZipEntry(name));
int len;
FileInputStream in = new FileInputStream(sourceFile);
while ((len = in.read(buf)) != -1) {
zos.write(buf, 0, len);
}
zos.closeEntry();
in.close();
} else {
File[] listFiles = sourceFile.listFiles();
if (listFiles == null || listFiles.length == 0) {
if (KeepDirStructure) {
zos.putNextEntry(new ZipEntry(name + "/"));
zos.closeEntry();
}
} else {
for (File file : listFiles) {
if (KeepDirStructure) {
compress(file, zos, name + "/" + file.getName());
} else {
compress(file, zos, file.getName());
}
}
}
}
}
// 刪除文件或文件夾以及文件夾下所有文件
public static void delDir(String dirPath) throws IOException {
log.info("刪除文件開始:{}.",dirPath);
long start = System.currentTimeMillis();
try{
File dirFile = new File(dirPath);
if (!dirFile.exists()) {
return;
}
if (dirFile.isFile()) {
dirFile.delete();
return;
}
File[] files = dirFile.listFiles();
if(files==null){
return;
}
for (int i = 0; i < files.length; i++) {
delDir(files[i].toString());
}
dirFile.delete();
log.info("刪除文件:{}. 耗時:{}ms. ",dirPath,System.currentTimeMillis()-start);
}catch(Exception e){
log.info("刪除文件:{}. 異常:{}. 耗時:{}ms. ",dirPath,e,System.currentTimeMillis()-start);
throw new IOException("刪除文件異常.");
}
}
}
將zip進行解壓
/**
* 解壓文件到指定目錄
* @explain
* @param zipPath 壓縮包的絕對完整路徑
* @param outDir 解壓到哪個地方
* @throws IOException
*/
@SuppressWarnings({ "rawtypes", "resource" })
public static void unZipFiles(String zipPath, String outDir) throws IOException {
log.info("文件:{}. 解壓路徑:{}. 解壓開始.",zipPath,outDir);
long start = System.currentTimeMillis();
try{
File zipFile = new File(zipPath);
System.err.println(zipFile.getName());
if(!zipFile.exists()){
throw new IOException("需解壓文件不存在.");
}
File pathFile = new File(outDir);
if (!pathFile.exists()) {
pathFile.mkdirs();
}
ZipFile zip = new ZipFile(zipFile, Charset.forName("GBK"));
for (Enumeration entries = zip.entries(); entries.hasMoreElements();) {
ZipEntry entry = (ZipEntry) entries.nextElement();
String zipEntryName = entry.getName();
System.err.println(zipEntryName);
InputStream in = zip.getInputStream(entry);
String outPath = (outDir + File.separator + zipEntryName).replaceAll("\\*", "/");
System.err.println(outPath);
// 判斷路徑是否存在,不存在則創建文件路徑
File file = new File(outPath.substring(0, outPath.lastIndexOf('/')));
if (!file.exists()) {
file.mkdirs();
}
// 判斷文件全路徑是否為文件夾,如果是上面已經上傳,不需要解壓
if (new File(outPath).isDirectory()) {
continue;
}
// 輸出文件路徑信息
OutputStream out = new FileOutputStream(outPath);
byte[] buf1 = new byte[1024];
int len;
while ((len = in.read(buf1)) > 0) {
out.write(buf1, 0, len);
}
in.close();
out.close();
}
log.info("文件:{}. 解壓路徑:{}. 解壓完成. 耗時:{}ms. ",zipPath,outDir,System.currentTimeMillis()-start);
}catch(Exception e){
log.info("文件:{}. 解壓路徑:{}. 解壓異常:{}. 耗時:{}ms. ",zipPath,outDir,e,System.currentTimeMillis()-start);
throw new IOException(e);
}
}
測試
public static void main(String[] args) {
try {
// 壓縮
toZip("D:\\apache-maven-3.5.3\\maven中央倉庫-jar下載", "D:\\apache-maven-3.5.3\\maven中央倉庫-jar下載.zip",true);
// 解壓
//unZipFiles("D:\\\\apache-maven-3.5.3\\\\maven中央倉庫-jar下載.zip","D:\\apache-maven-3.5.3");
} catch (Exception e) {
e.printStackTrace();
}
}
方式二：壓縮成zip可設密碼
所需jar包：zip4j_1.3.1.jar
package base.web.tools;
import java.io.FileNotFoundException;
import org.apache.commons.lang.StringUtils;
import net.lingala.zip4j.core.ZipFile;
import net.lingala.zip4j.exception.ZipException;
import net.lingala.zip4j.model.ZipParameters;
import net.lingala.zip4j.util.Zip4jConstants;
/**
* <ul>
* <li>支持多層次目錄ZIP壓縮的工具</li>
* <li>用法 :</li>
* <li>1.普通壓縮, Zipper.packageFolder(folder, target);</li>
* <li>2.加密碼的壓縮 , Zipper.packageFolderWithPassword(folder, target, password);</li>
* <li>參數說明：</li>
* <ol>
* <li>folder 待壓縮的目錄</li>
* <li>target 目標文件路徑</li>
* </ol>
* </ul>
*/
public class Zipper {
/**
* 壓縮文件夾
* @expalin 如果已經存在相同的壓縮包，則會覆蓋之前的壓縮包
* @param folder 要打包的文件夾的磁盤路徑
* 比如，D:\\aa\\bb
* @param target 存放打包后的壓縮包的磁盤路徑
* 構成：路徑+壓縮包名稱.后綴名
* 比如，D:\\aa\\bb.zip
* @throws ZipException
*/
public static void packageFolder(String folder, String target) throws ZipException {
packageFolderWithPassword(folder, target, null);
}
public static void packageFolderWithPassword(String folder, String target, String password) throws ZipException{
ZipFile zip = new ZipFile(target);
ZipParameters parameters = new ZipParameters();
parameters.setCompressionMethod(Zip4jConstants.COMP_DEFLATE);
parameters.setCompressionLevel(Zip4jConstants.DEFLATE_LEVEL_NORMAL);
// 加密
if(StringUtils.isNotBlank(password)){
parameters.setEncryptFiles(true);
parameters.setEncryptionMethod(Zip4jConstants.ENC_METHOD_STANDARD);
parameters.setPassword(password);
}
zip.addFolder(folder, parameters);
}
public static void main(String[] args) throws FileNotFoundException {
try {
packageFolder("D:\\aa\\bb", "D:\\aa\\bb.zip");
} catch (ZipException e) {
e.printStackTrace();
}
}
}