java gzip 压缩字符串

您可以使用 Java 中的 GZIPOutputStream 类来压缩字符串，示例代码如下：

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;

public class GzipExample {

    public static void main(String[] args) throws IOException {
        String str = "Hello, world!"; // 待压缩字符串

        // 压缩字符串
        byte[] compressed = compress(str);
        System.out.println("Compressed: " + new String(compressed, StandardCharsets.UTF_8));

        // 解压字符串
        String decompressed = decompress(compressed);
        System.out.println("Decompressed: " + decompressed);
    }

    public static byte[] compress(String str) throws IOException {
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        try (GZIPOutputStream gzip = new GZIPOutputStream(out)) {
            gzip.write(str.getBytes(StandardCharsets.UTF_8));
        }
        return out.toByteArray();
    }

    public static String decompress(byte[] compressed) throws IOException {
        ByteArrayInputStream in = new ByteArrayInputStream(compressed);
        try (GZIPInputStream gzip = new GZIPInputStream(in)) {
            byte[] buffer = new byte[1024];
            int len;
            ByteArrayOutputStream out = new ByteArrayOutputStream();
            while ((len = gzip.read(buffer)) > 0) {
                out.write(buffer, 0, len);
            }
            return out.toString(StandardCharsets.UTF_8.name());
        }
    }
}

在上述示例代码中，compress() 方法输入一个字符串，输出一个经过 GZIP 压缩后的字节数组；decompress() 方法输入一个经过 GZIP 压缩的字节数组，输出一个解压后的字符串。