StringCompressUtils.java

package javax.utils;import java.io.ByteArrayInputStream;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.util.zip.GZIPInputStream;import java.util.zip.GZIPOutputStream;import java.util.zip.ZipEntry;import java.util.zip.ZipInputStream;import java.util.zip.ZipOutputStream;import org.apache.commons.codec.binary.Base64;/** * Java 字符串压缩工具 *  * @author Logan * @version 1.0.0 * */public class StringCompressUtils {    /**     * 使用gzip进行压缩     *      * @param str 压缩前的文本     * @return 返回压缩后的文本     * @throws IOException 有异常时抛出，由调用者捕获处理     */    public static String gzip(String str) throws IOException {        if (str == null || str.isEmpty()) {            return str;        }        ByteArrayOutputStream out = new ByteArrayOutputStream();        try (                GZIPOutputStream gzip = new GZIPOutputStream(out);        ) {            gzip.write(str.getBytes());        }        return Base64.encodeBase64String(out.toByteArray());    }    /**     * 使用gzip进行解压缩     *      * @param compressedStr 压缩字符串     * @return 解压字符串     * @throws IOException 有异常时抛出，由调用者捕获处理     */    public static String gunzip(String compressedStr) throws IOException {        if (compressedStr == null || compressedStr.isEmpty()) {            return compressedStr;        }        byte[] compressed = Base64.decodeBase64(compressedStr);        ByteArrayOutputStream out = new ByteArrayOutputStream();        ByteArrayInputStream in = new ByteArrayInputStream(compressed);        try (                GZIPInputStream ginzip = new GZIPInputStream(in);        ) {            byte[] buffer = new byte[4096];            int len = -1;            while ((len = ginzip.read(buffer)) != -1) {                out.write(buffer, 0, len);            }        }        return out.toString();    }    /**     * 使用zip进行压缩     *      * @param str 压缩前的文本     * @return 返回压缩后的文本     * @throws IOException 有异常时抛出，由调用者捕获处理     */    public static String zip(String str) throws IOException {        if (null == str || str.isEmpty()) {            return str;        }        ByteArrayOutputStream out = new ByteArrayOutputStream();        try (                ZipOutputStream zout = new ZipOutputStream(out);        ) {            zout.putNextEntry(new ZipEntry("0"));            zout.write(str.getBytes());            zout.closeEntry();        }        return Base64.encodeBase64String(out.toByteArray());    }    /**     * 使用zip进行解压缩     *      * @param compressed 压缩后的文本     * @return 解压后的字符串     * @throws IOException 有异常时抛出，由调用者捕获处理     */    public static final String unzip(String compressedStr) throws IOException {        if (null == compressedStr || compressedStr.isEmpty()) {            return compressedStr;        }        byte[] compressed = Base64.decodeBase64(compressedStr);        ByteArrayOutputStream out = new ByteArrayOutputStream();        ByteArrayInputStream in = new ByteArrayInputStream(compressed);        try (                ZipInputStream zin = new ZipInputStream(in);        ) {            zin.getNextEntry();            byte[] buffer = new byte[4096];            int len = -1;            while ((len = zin.read(buffer)) != -1) {                out.write(buffer, 0, len);            }        }        return out.toString();    }}