java xml字符串如何壓縮

在Java中，可以使用Deflater類來實(shí)現(xiàn)XML字符串的壓縮。以下是一個(gè)簡(jiǎn)單的示例：

import java.util.zip.Deflater;
import java.util.zip.DeflaterOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.nio.charset.StandardCharsets;

public class XmlCompression {

    public static void main(String[] args) throws IOException {
        String xmlString = "<?xml version=\"1.0\" encoding=\"UTF-8\"?><root><element>Content</element></root>";
        byte[] compressedBytes = compressXml(xmlString);
        System.out.println("Compressed XML: " + new String(compressedBytes, StandardCharsets.UTF_8));
    }

    public static byte[] compressXml(String xmlString) throws IOException {
        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
        Deflater deflater = new Deflater(Deflater.BEST_COMPRESSION);
        DeflaterOutputStream deflaterOutputStream = new DeflaterOutputStream(byteArrayOutputStream, deflater);
        deflaterOutputStream.write(xmlString.getBytes(StandardCharsets.UTF_8));
        deflaterOutputStream.close();
        return byteArrayOutputStream.toByteArray();
    }
}

在這個(gè)示例中，我們首先創(chuàng)建了一個(gè)包含XML字符串的ByteArrayOutputStream對(duì)象。然后，我們創(chuàng)建了一個(gè)Deflater對(duì)象，并設(shè)置了壓縮級(jí)別為Deflater.BEST_COMPRESSION。接下來，我們創(chuàng)建了一個(gè)DeflaterOutputStream對(duì)象，將ByteArrayOutputStream和Deflater對(duì)象作為參數(shù)傳遞。最后，我們將XML字符串寫入DeflaterOutputStream，并關(guān)閉流。這將返回一個(gè)壓縮后的字節(jié)數(shù)組。