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
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。
