Android 解压缩功能

主要用到zip：

1 import java.util.Enumeration;
2 import java.util.zip.CRC32;
3 import java.util.zip.CheckedOutputStream;
4 import java.util.zip.ZipEntry;
5 import java.util.zip.ZipFile;
6 import java.util.zip.ZipOutputStream;

解压文件：

 1 /**
 2      * 解压缩功能. 将zipPath文件 解压到folderPath目录下.
 3      *
 4      * @param zipFile zip文件
 5      * @param destDir 解压到的文件路径
 6      * @throws java.io.IOException
 7      */
 8     public static void upZipFile(File zipFile, String destDir) {
 9         File pathFile = new File(destDir + "/");
10         if (!pathFile.exists()) {
11             pathFile.mkdirs();
12         }
13
14         try {
15             ZipFile zip = new ZipFile(zipFile);
16
17             for (Enumeration<?> entries = zip.entries(); entries.hasMoreElements(); ) {
18                 ZipEntry entry = (ZipEntry) entries.nextElement();
19                 String zipEntryName = entry.getName();
20
21                 InputStream in = zip.getInputStream(entry);
22                 String outPath = (destDir + "/" + zipEntryName).replaceAll("\\*", "/");
23
24                 // 判断路径是否存在,不存在则创建文件路径
25                 File file = new File(outPath.substring(0, outPath.lastIndexOf(‘/‘)));
26                 if (!file.exists()) {
27                     file.mkdirs();
28                 }
29                 // 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
30                 if (new File(outPath).isDirectory()) {
31                     continue;
32                 }
33                 // 输出文件路径信息
34                 System.out.println(outPath);
35
36                 OutputStream out = new FileOutputStream(outPath);
37                 byte[] buf1 = new byte[1024];
38                 int len;
39                 while ((len = in.read(buf1)) > 0) {
40                     out.write(buf1, 0, len);
41                 }
42                 in.close();
43                 out.close();
44             }
45         } catch (IOException e) {
46             e.printStackTrace();
47         }
48     }

压缩文件：

（1）首先要声明个压缩类：

 1 public static class ZipCompressor {
 2         static final int BUFFER = 1024 * 128;
 3
 4         private File zipFile;
 5
 6         public ZipCompressor(String pathName) {
 7             zipFile = new File(pathName);
 8         }
 9
10         public void compress(String srcPathName) {
11             File file = new File(srcPathName);
12             if (!file.exists())
13                 throw new RuntimeException(srcPathName + "不存在！");
14             try {
15                 FileOutputStream fileOutputStream = new FileOutputStream(zipFile);
16                 CheckedOutputStream cos = new CheckedOutputStream(fileOutputStream, new CRC32());
17                 ZipOutputStream out = new ZipOutputStream(cos);
18                 String basedir = "";
19                 compress(file, out, basedir);
20                 out.close();
21             } catch (Exception e) {
22                 throw new RuntimeException(e);
23             }
24         }
25
26         private void compress(File file, ZipOutputStream out, String basedir) {
27             /* 判断是目录还是文件 */
28             if (file.isDirectory()) {
29                 System.out.println("压缩：" + basedir + file.getName());
30                 this.compressDirectory(file, out, basedir);
31             } else {
32                 System.out.println("压缩：" + basedir + file.getName());
33                 this.compressFile(file, out, basedir);
34             }
35         }
36
37         /** 压缩一个目录 */
38         private void compressDirectory(File dir, ZipOutputStream out, String basedir) {
39             if (!dir.exists())
40                 return;
41
42             File[] files = dir.listFiles();
43             for (int i = 0; i < files.length; i++) {
44                 /* 递归 */
45                 compress(files[i], out, basedir + dir.getName() + "/");
46             }
47         }
48
49         /** 压缩一个文件 */
50         private void compressFile(File file, ZipOutputStream out, String basedir) {
51             if (!file.exists()) {
52                 return;
53             }
54             try {
55                 BufferedInputStream bis = new BufferedInputStream(new FileInputStream(file));
56                 ZipEntry entry = new ZipEntry(basedir + file.getName());
57                 out.putNextEntry(entry);
58                 int count;
59                 byte data[] = new byte[BUFFER];
60                 while ((count = bis.read(data, 0, BUFFER)) != -1) {
61                     out.write(data, 0, count);
62                 }
63                 bis.close();
64             } catch (Exception e) {
65                 throw new RuntimeException(e);
66             }
67         }
68     }

压缩类使用：

1 public static void compress(String srcPathName, String zipPathName) {
2     ZipCompressor zipCompressor = new ZipCompressor(zipPathName);
3     zipCompresspr.compress(srcPathName);
4 }