java base64压缩_Base64和Zip数据压缩与解压

压缩图片数据，解压图片数据

public class TestZCompress {

public static void main(String[] args) {

try {

File file = new File("D://haha.jpg");

if (file.exists()) {

InputStream in = new FileInputStream("D://haha.jpg");

byte[] buf = new byte[in.available()];

in.read(buf);

in.close();

String data = Base64.encode(ZipUtil.compress2(buf));

byte[] b = ZipUtil.decompress2(Base64.decode(data));

for (int i = 0; i < b.length; ++i) {

if (b[i] < 0) {// 调整异常数据

b[i] += 256;

}

}

String imgFilePath = "D://xixi.jpg";// 新生成的图片

OutputStream out = new FileOutputStream(imgFilePath);

out.write(b);

out.flush();

out.close();

}

} catch (Exception e) {

e.printStackTrace();

System.out.println(e.toString());

}

}

}

压缩字符串，解压字符串

String str = "http://xxxxxxxxxxxxxxxx";

String compressStr = Base64.encode(ZipUtil.compress(str));

System.out.println(compressStr);

String deCompressStr = ZipUtil.decompress(Base64.decode(compressStr));

System.out.println(deCompressStr);

-----------------------------------Base64--------------------------------------------

import java.io.ByteArrayOutputStream;

import java.io.IOException;

import java.io.OutputStream;

import java.util.Vector;

public class Base64 {

private static final char[] legalChars =

"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"

.toCharArray();

@SuppressWarnings("unchecked")

private static Vector nodes = new Vector();

/**

* Split string into multiple strings

*

* @param original

*            Original string

* @param separator

*            Separator string in original string

* @return Splitted string array

*/

public static String[] split(String original, String separator) {

nodes.removeAllElements();

// Parse nodes into vector

int index = original.indexOf(separator);

while (index >= 0) {

nodes.addElement(original.substring(0, index));

original = original.substring(index + separator.length());

index = original.indexOf(separator);

}

// Get the last node

nodes.addElement(original);

// Create splitted string array

String[] result = new String[nodes.size()];

if (nodes.size() > 0) {

for (int loop = 0; loop < nodes.size(); loop++) {

result[loop] = (String) nodes.elementAt(loop);

}

}

return result;

}

/*

* Replace all instances of a String in a String. @param s String to alter.

* @param f String to look for. @param r String to replace it with, or null

* to just remove it.

*/

public static String replace(String s, String f, String r) {

if (s == null) {

return s;

}

if (f == null) {

return s;

}

if (r == null) {

r = "";

}

int index01 = s.indexOf(f);

while (index01 != -1) {

s = s.substring(0, index01) + r + s.substring(index01 + f.length());

index01 += r.length();

index01 = s.indexOf(f, index01);

}

return s;

}

/**

* Method removes HTML tags from given string.

*

* @param text

*            Input parameter containing HTML tags (eg. cat)

* @return String without HTML tags (eg. cat)

*/

public static String removeHtml(String text) {

try {

int idx = text.indexOf("

if (idx == -1) {

return text;

}

String plainText = "";

String htmlText = text;

int htmlStartIndex = htmlText.indexOf("

if (htmlStartIndex == -1) {

return text;

} while (htmlStartIndex >= 0) {

plainText += htmlText.substring(0, htmlStartIndex);

int htmlEndIndex = htmlText.indexOf(">", htmlStartIndex);

htmlText = htmlText.substring(htmlEndIndex + 1);

htmlStartIndex = htmlText.indexOf("

}

plainText = plainText.trim();

return plainText;

} catch (Exception e) {

System.err.println("Error while removing HTML: " + e.toString());

return text;

}

}

/** Base64 encode the given data */

public static String encode(byte[] data) {

int start = 0;

int len = data.length;

StringBuffer buf = new StringBuffer(data.length * 3 / 2);

int end = len - 3;

int i = start;

int n = 0;

while (i <= end) {

int d = ((((int) data[i]) & 0x0ff) << 16)

| ((((int) data[i + 1]) & 0x0ff) << 8)

| (((int) data[i + 2]) & 0x0ff);

buf.append(legalChars[(d >> 18) & 63]);

buf.append(legalChars[(d >> 12) & 63]);

buf.append(legalChars[(d >> 6) & 63]);

buf.append(legalChars[d & 63]);

i += 3;

if (n++ >= 14) {

n = 0;

buf.append(" ");

}

}

if (i == start + len - 2) {

int d = ((((int) data[i]) & 0x0ff) << 16)

| ((((int) data[i + 1]) & 255) << 8);

buf.append(legalChars[(d >> 18) & 63]);

buf.append(legalChars[(d >> 12) & 63]);

buf.append(legalChars[(d >> 6) & 63]);

buf.append("=");

} else if (i == start + len - 1) {

int d = (((int) data[i]) & 0x0ff) << 16;

buf.append(legalChars[(d >> 18) & 63]);

buf.append(legalChars[(d >> 12) & 63]);

buf.append("==");

}

return buf.toString();

}

private static int decode(char c) {

if (c >= 'A' && c <= 'Z') {

return ((int) c) - 65;

} else if (c >= 'a' && c <= 'z') {

return ((int) c) - 97 + 26;

} else if (c >= '0' && c <= '9') {

return ((int) c) - 48 + 26 + 26;

} else {

switch (c) {

case '+':

return 62;

case '/':

return 63;

case '=':

return 0;

default:

throw new RuntimeException("unexpected code: " + c);

}

}

}

/**

* Decodes the given Base64 encoded String to a new byte array. The byte

* array holding the decoded data is returned.

*/

public static byte[] decode(String s) {

ByteArrayOutputStream bos = new ByteArrayOutputStream();

try {

decode(s, bos);

} catch (IOException e) {

throw new RuntimeException();

}

byte[] decodedBytes = bos.toByteArray();

try {

bos.close();

bos = null;

} catch (IOException ex) {

System.err.println("Error while decoding BASE64: " + ex.toString());

}

return decodedBytes;

}

private static void decode(String s, OutputStream os) throws IOException {

int i = 0;

int len = s.length();

while (true) {

while (i < len && s.charAt(i) <= ' ') {

i++;

}

if (i == len) {

break;

}

int tri = (decode(s.charAt(i)) << 18)

+ (decode(s.charAt(i + 1)) << 12)

+ (decode(s.charAt(i + 2)) << 6)

+ (decode(s.charAt(i + 3)));

os.write((tri >> 16) & 255);

if (s.charAt(i + 2) == '=') {

break;

}

os.write((tri >> 8) & 255);

if (s.charAt(i + 3) == '=') {

break;

}

os.write(tri & 255);

i += 4;

}

}

}

--------------------------------------ZipUtil--------------------------------------------

public class ZipUtil {

/**

* 压缩字符串为 byte[] 储存可以使用new sun.misc.BASE64Encoder().encodeBuffer(byte[] b)方法

* 保存为字符串

*

* @param str

*            压缩前的文本

* @return

*/

public static final byte[] compress(String str) {

if (str == null)

return null;

byte[] compressed;

ByteArrayOutputStream out = null;

ZipOutputStream zout = null;

try {

out = new ByteArrayOutputStream();

zout = new ZipOutputStream(out);

zout.putNextEntry(new ZipEntry("0"));

zout.write(str.getBytes());

zout.closeEntry();

compressed = out.toByteArray();

} catch (IOException e) {

compressed = null;

} finally {

if (zout != null) {

try {

zout.close();

} catch (IOException e) {

}

}

if (out != null) {

try {

out.close();

} catch (IOException e) {

}

}

}

return compressed;

}

/**

* 将压缩后的 byte[] 数据解压缩

*

* @param compressed

*            压缩后的 byte[] 数据

* @return 解压后的字符串

*/

public static final String decompress(byte[] compressed) {

if (compressed == null)

return null;

ByteArrayOutputStream out = null;

ByteArrayInputStream in = null;

ZipInputStream zin = null;

String decompressed;

try {

out = new ByteArrayOutputStream();

in = new ByteArrayInputStream(compressed);

zin = new ZipInputStream(in);

ZipEntry entry = 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;

}

//解压byte[]返回byte[]

public static final byte[] decompress2(byte[] compressed) {

if (compressed == null)

return null;

ByteArrayOutputStream out = null;

ByteArrayInputStream in = null;

ZipInputStream zin = null;

byte[] decompressed;

try {

out = new ByteArrayOutputStream();

in = new ByteArrayInputStream(compressed);

zin = new ZipInputStream(in);

ZipEntry entry = zin.getNextEntry();

byte[] buffer = new byte[1024];

int offset = -1;

while ((offset = zin.read(buffer)) != -1) {

out.write(buffer, 0, offset);

}

decompressed = out.toByteArray();

} 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;

}

//压缩byte[] 返回byte[]

public static final byte[] compress2(byte[] str) {

if (str == null)

return null;

byte[] compressed;

ByteArrayOutputStream out = null;

ZipOutputStream zout = null;

try {

out = new ByteArrayOutputStream();

zout = new ZipOutputStream(out);

zout.putNextEntry(new ZipEntry("0"));

zout.write(str);

zout.closeEntry();

compressed = out.toByteArray();

} catch (IOException e) {

compressed = null;

} finally {

if (zout != null) {

try {

zout.close();

} catch (IOException e) {

}

}

if (out != null) {

try {

out.close();

} catch (IOException e) {

}

}

}

return compressed;

}

}