主要是运用ZipInputStream和ZipOutputStream实现

当中要注意，在文件解压时，ZipEntry中的名字是相对路径

File的方法createNewFile()只能在存在的目录下创建文件,所以在有多层目录时，先要mkdirs来创建目录，然后创建文件

代码如下

import java.io.*;
import java.util.zip.*;
import java.util.*;public class Main  
{private void zip(ZipOutputStream out, File f, String base) throws Exception{if (f.isDirectory()) {File[] files = f.listFiles();base = (base.length() == 0 ? "" : base + "/");for (int i = 0; i < files.length; i++) {zip(out, files[i], base + files[i].getName());}} else {out.putNextEntry(new ZipEntry(base));BufferedInputStream in = new BufferedInputStream(new FileInputStream(f));int c;while ((c = in.read()) != -1) {out.write(c);}in.close();}}private void zip(File inputFileName, String zipFileName) throws Exception{ZipOutputStream out = new ZipOutputStream(new FileOutputStream(zipFileName));zip(out, inputFileName, "");out.close();}//压缩文件，inputFileName表示要压缩的文件（可以为目录）,zipFileName表示压缩后的zip文件public void zip(String inputFileName, String zipFileName) throws Exception{zip(new File(inputFileName), zipFileName);}//解压,zipFileName表示待解压的zip文件，unzipDir表示解压后文件存放目录public void unzip(String zipFileName, String unzipDir) throws Exception{ZipInputStream in = new ZipInputStream(new FileInputStream(zipFileName));ZipEntry entry;while ((entry = in.getNextEntry()) != null) {String fileName = entry.getName();//有层级结构，就先创建目录String tmp;int index = fileName.lastIndexOf('/');if (index != -1) {tmp = fileName.substring(0, index);tmp = unzipDir + "/" + tmp;File f = new File(tmp);f.mkdirs();}//创建文件fileName = unzipDir + "/" + fileName;File file = new File(fileName);file.createNewFile();FileOutputStream out = new FileOutputStream(file);int c;while ((c = in.read()) != -1) {out.write(c);}out.close();}in.close();}public static void main(String[] args){try {String inputFileName = "F:\\test";String zipFileName = "F:\\test.zip";Main test = new Main();test.unzip(zipFileName, inputFileName);}catch (Exception e) {e.printStackTrace();}}
}