由于需要将一个较大的参数值 进行数据库存储，而存储后在进行读取时会由于该表的存储量很大，这个值会导致加大IO

我们在JAVA中能否使用一个比较高压缩的方式或进行编码、加密也可，或者某种手段将这个字符串的长度进行压缩

下面是我的实现方法：

1 压缩方法源码

/**

* 使用gzip进行压缩

* @param primStr

* @return

*/

public static String gzip(String primStr) {

if (primStr == null || primStr.length() == 0) {

return primStr;

}

ByteArrayOutputStream out = new ByteArrayOutputStream();

GZIPOutputStream gzip = null;

try {

gzip = new GZIPOutputStream(out);

gzip.write(primStr.getBytes());

} catch (IOException e) {

e.printStackTrace();

} finally {

if (gzip != null) {

try {

gzip.close();

} catch (IOException e) {

e.printStackTrace();

}

}

}

return new sun.misc.BASE64Encoder().encode(out.toByteArray());

}

/**

* 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());

zout.closeEntry();

compressed = out.toByteArray();

compressedStr = new sun.misc.BASE64Encoder()

.encodeBuffer(compressed);

} 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 compressedStr;

}

2 解压方法源码

/**

* 使用gzip进行解压缩

* @param compressedStr

* @return

*/

public static String gunzip(String compressedStr) {

if (compressedStr == null) {

return null;

}

ByteArrayOutputStream out = new ByteArrayOutputStream();

ByteArrayInputStream in = null;

GZIPInputStream ginzip = null;

byte[] compressed = null;

String decompressed = null;

try {

compressed = new sun.misc.BASE64Decoder()

.decodeBuffer(compressedStr);

in = new ByteArrayInputStream(compressed);

ginzip = new GZIPInputStream(in);

byte[] buffer = new byte[1024];

int offset = -1;

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

out.write(buffer, 0, offset);

}

decompressed = out.toString();

} catch (IOException e) {

e.printStackTrace();

} finally {

if (ginzip != null) {

try {

ginzip.close();

} catch (IOException e) {

}

}

if (in != null) {

try {

in.close();

} catch (IOException e) {

}

}

if (out != null) {

try {

out.close();

} catch (IOException e) {

}

}

}

return decompressed;

}

/**

* 使用zip进行解压缩

* @param compressed 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);

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;

}

3 测试方法

/**

* 测试方法

* @param args

*/

public static void main(String[] args) {

StringBuilder sb = new StringBuilder();

for (int i = 0; i < 1000; i++) {

// 长度为2000的一个字符串

sb.append("ab");

}

String jiaStr = gzip(sb.toString());

System.out.println(jiaStr);

String jieStr = gunzip(jiaStr);

System.out.println(jieStr);

}

请大家多多关注我的头条号，谢谢大家。