标签：
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. <strong>cat</strong>)
* @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("<", 0);
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("<", 0);
}
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;
}
}
标签：
原文地址：http://www.cnblogs.com/zj83142/p/4711319.html
