1 import java.io.ByteArrayInputStream;
2 import java.io.ByteArrayOutputStream;
3 import java.io.IOException;
4 import java.io.InputStream;
5 import java.util.zip.GZIPInputStream;
6 import java.util.zip.GZIPOutputStream;
7
8 import org.apache.commons.codec.binary.Base64;
9 import org.apache.commons.io.IOUtils;
10
11 /**
12 * 解压压缩工具
13 */
14 public class Gzip {
15
16 public String unzip(String str) {
17 if (str == null || str.length() == 0) {
18 return str;
19 }
20 Base64 base64 = new Base64();
21 byte[] bytes = base64.decode(str);
22 String json = this.uncompress(bytes, "UTF-8");
23 return json;
24 }
25
26 public String zip(String str) {
27 if (str == null || str.length() == 0) {
28 return str;
29 }
30 Base64 base64 = new Base64();
31 byte[] bytes = this.compress(str, "UTF-8");
32 String json = base64.encodeToString(bytes);
33 return json;
34 }
35
36 private byte[] compress(String str, String encoding) {
37 GZIPOutputStream gzip = null;
38 ByteArrayOutputStream out = new ByteArrayOutputStream();
39 IOStreamOperator operator = new IOStreamOperator();
40 try {
41 gzip = new GZIPOutputStream(out);
42 gzip.write(str.getBytes(encoding));
43 gzip.close();
44 }
45 catch (IOException ex) {
46 ex.printStackTrace();
47 }
48 finally {
49 operator.close(null, gzip);
50 }
51 return out.toByteArray();
52 }
53
54 private String uncompress(byte[] bytes, String encoding) {
55 InputStream in = null;
56 GZIPInputStream gi = null;
57 IOStreamOperator operator = new IOStreamOperator();
58 String ret = null;
59 try {
60 in = new ByteArrayInputStream(bytes);
61 gi = new GZIPInputStream(in);
62 ret = IOUtils.toString(gi, encoding);
63 }
64 catch (IOException e) {
65 e.printStackTrace();
66 }
67 finally {
68 operator.close(gi, null);
69 }
70 return ret;
71 }
72 }
