1.情景展示
java实现将文件夹进行压缩打包的功能及在线解压功能
2.解决方案
方式一：压缩、解压zip
准备工作：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>
如果不需要日志记录，则可以把log去掉。
导入
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;
压缩成zip
/**
* 文件压缩、解压工具类
*/
public class ZipUtils {
private static final int BUFFER_SIZE = 2 * 1024;
/**
* 是否保留原来的目录结构
* true: 保留目录结构;
* false: 所有文件跑到压缩包根目录下(注意：不保留目录结构可能会出现同名文件,会压缩失败)
*/
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中央仓库-jar下载", "D:\apache-maven-3.5.3\maven中央仓库-jar下载.zip",true);
unZipFiles("D:\\apache-maven-3.5.3\\maven中央仓库-jar下载.zip","D:\apache-maven-3.5.3\maven中央仓库-jar下载");
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 压缩成ZIP
* @param srcDir 压缩 文件/文件夹 路径
* @param outPathFile 压缩 文件/文件夹 输出路径+文件名 D:/xx.zip
* @param isDelSrcFile 是否删除原文件: 压缩前文件
*/
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("需压缩文件或者文件夹不存在");
}
compress(sourceFile, zos, sourceFile.getName());
if(isDelSrcFile){
delDir(srcDir);
}
log.info("原文件:{}. 压缩到:{}完成. 是否删除原文件:{}. 耗时:{}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) {}
}
}
/**
* 递归压缩方法
* @param sourceFile 源文件
* @param zos zip输出流
* @param name 压缩后的名称
*/
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());
}
}
}
}
}
// 删除文件或文件夹以及文件夹下所有文件
public static void delDir(String dirPath) throws IOException {
log.info("删除文件开始:{}.",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("删除文件:{}. 耗时:{}ms. ",dirPath,System.currentTimeMillis()-start);
}catch(Exception e){
log.info("删除文件:{}. 异常:{}. 耗时:{}ms. ",dirPath,e,System.currentTimeMillis()-start);
throw new IOException("删除文件异常.");
}
}
}
将zip进行解压
/**
* 解压文件到指定目录
* @explain
* @param zipPath 压缩包的绝对完整路径
* @param outDir 解压到哪个地方
* @throws IOException
*/
@SuppressWarnings({ "rawtypes", "resource" })
public static void unZipFiles(String zipPath, String outDir) throws IOException {
log.info("文件:{}. 解压路径:{}. 解压开始.",zipPath,outDir);
long start = System.currentTimeMillis();
try{
File zipFile = new File(zipPath);
System.err.println(zipFile.getName());
if(!zipFile.exists()){
throw new IOException("需解压文件不存在.");
}
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);
// 判断路径是否存在,不存在则创建文件路径
File file = new File(outPath.substring(0, outPath.lastIndexOf('/')));
if (!file.exists()) {
file.mkdirs();
}
// 判断文件全路径是否为文件夹,如果是上面已经上传,不需要解压
if (new File(outPath).isDirectory()) {
continue;
}
// 输出文件路径信息
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:{}. 解压路径:{}. 解压完成. 耗时:{}ms. ",zipPath,outDir,System.currentTimeMillis()-start);
}catch(Exception e){
log.info("文件:{}. 解压路径:{}. 解压异常:{}. 耗时:{}ms. ",zipPath,outDir,e,System.currentTimeMillis()-start);
throw new IOException(e);
}
}
测试
public static void main(String[] args) {
try {
// 压缩
toZip("D:\apache-maven-3.5.3\maven中央仓库-jar下载", "D:\apache-maven-3.5.3\maven中央仓库-jar下载.zip",true);
// 解压
//unZipFiles("D:\\apache-maven-3.5.3\\maven中央仓库-jar下载.zip","D:\apache-maven-3.5.3");
} catch (Exception e) {
e.printStackTrace();
}
}
方式二：压缩成zip可设密码
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>支持多层次目录ZIP压缩的工具</li>
* <li>用法 :</li>
* <li>1.普通压缩, Zipper.packageFolder(folder, target);</li>
* <li>2.加密码的压缩 , Zipper.packageFolderWithPassword(folder, target, password);</li>
* <li>参数说明：</li>
* <ol>
* <li>folder 待压缩的目录</li>
* <li>target 目标文件路径</li>
* </ol>
* </ul>
*/
public class Zipper {
/**
* 压缩文件夹
* @expalin 如果已经存在相同的压缩包，则会覆盖之前的压缩包
* @param folder 要打包的文件夹的磁盘路径
* 比如，D:\aa\bb
* @param target 存放打包后的压缩包的磁盘路径
* 构成：路径+压缩包名称.后缀名
* 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();
}
}
}