java将字符串压缩很短成字符串并能解压缩还原的工具类

可以使用Java中的GZIP进行字符串的压缩和解压缩，以下是示例代码：

将字符串压缩为短字符串：

import java.io.*;
import java.util.Base64;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;

public class GzipUtils {

    public static String compress(String str) throws IOException {
        if (str == null || str.length() == 0) {
            return str;
        }
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        GZIPOutputStream gzip = new GZIPOutputStream(out);
        gzip.write(str.getBytes());
        gzip.close();
        return Base64.getEncoder().encodeToString(out.toByteArray());
    }

    public static String uncompress(String compressedStr) throws IOException {
        if (compressedStr == null || compressedStr.length() == 0) {
            return compressedStr;
        }
        byte[] compressed = Base64.getDecoder().decode(compressedStr);
        ByteArrayInputStream in = new ByteArrayInputStream(compressed);
        GZIPInputStream gzip = new GZIPInputStream(in);
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        byte[] buffer = new byte[1024];
        int len;
        while ((len = gzip.read(buffer)) > 0) {
            out.write(buffer, 0, len);
        }
        gzip.close();
        out.close();
        return out.toString();
    }
}

使用示例：

String originalString = "Hello, World!";
String compressedString = GzipUtils.compress(originalString);
String decompressedString = GzipUtils.uncompress(compressedString);
System.out.println(originalString.equals(decompressedString)); // true

注意：压缩后的字符串长度取决于原始字符串的内容和长度，不一定一定能够压缩得很短。