android zip压缩base64解密加密

import android.util.Base64;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipOutputStream;

/**
* 所有Util的集合
*/
public class Utils {

/**
* 使用zip进行压缩
*
* @param str 压缩前的文本
* @return 返回压缩后的文本
*/
public static final String zip(String str) {
if (str == null)
return null;
byte[] compressed;
ByteArrayOutputStream out = null;
ZipOutputStream zout = null;
String compressedStr = null;
try {
out = new ByteArrayOutputStream();
zout = new ZipOutputStream(out);
zout.putNextEntry(new ZipEntry("0"));
zout.write(str.getBytes("utf-8"));
zout.closeEntry();
compressed = out.toByteArray();
//compressedStr = new sun.misc.BASE64Encoder().encodeBuffer(compressed);//base64解密(java写法)
compressedStr = Base64.encodeToString(compressed, Base64.NO_WRAP);//base64解密(android写法)
} catch (IOException e) {
} finally {
compressed = null;
if (zout != null) {
try {
zout.close();
} catch (IOException e) {
}
}
if (out != null) {
try {
out.close();
} catch (IOException e) {
}
}
}
return compressedStr;
}

/**
* 使用zip进行解压缩
*
* @param compressedStr 压缩后的文本
* @return 解压后的字符串
*/
public static final String unzip(String compressedStr) {
if (compressedStr == null) {
return null;
}

ByteArrayOutputStream out = null;
ByteArrayInputStream in = null;
ZipInputStream zin = null;
String decompressed = null;
try {
//byte[] compressed = new sun.misc.BASE64Decoder().decodeBuffer(compressedStr);//base64加密(java写法)
byte[] compressed = Base64.decode(compressedStr,Base64.DEFAULT);//base64加密(android写法)
out = new ByteArrayOutputStream();
in = new ByteArrayInputStream(compressed);
zin = new ZipInputStream(in);
zin.getNextEntry();
byte[] buffer = new byte[1024];
int offset = -1;
while ((offset = zin.read(buffer)) != -1) {
out.write(buffer, 0, offset);
}
decompressed = out.toString();
} catch (IOException e) {
decompressed = null;
} finally {
if (zin != null) {
try {
zin.close();
} catch (IOException e) {
}
}
if (in != null) {
try {
in.close();
} catch (IOException e) {
}
}
if (out != null) {
try {
out.close();
} catch (IOException e) {
}
}
}
return decompressed;
}

}