java使用7z对文件压缩可以使文件大小被压缩的很小，便于对文件的归档处理，使用apache的commons-compress可以实现文件的7z解压缩功能

1.压缩

/**
 * 7z文件压缩
 *
 * @param inputFile  待压缩文件夹/文件名
 * @param outputFile 生成的压缩包名字
 */
public static void compress7z(String inputFile, String outputFile) {
    log.info("开始7z压缩本地路径{}的相关日志到{}压缩文件中", inputFile, outputFile);
    StopWatch watch = new StopWatch();
    watch.start("7z压缩");
    SevenZOutputFile outArchive = null;
    try {
        File input = new File(inputFile);
        if (!input.exists()) {
            throw new RuntimeException(input.getPath() + "待压缩文件不存在");
        }
        File output = new File(outputFile);
        outArchive = new SevenZOutputFile(output);
        // 递归压缩
        compress(outArchive, input, null);
    } catch (Exception e) {
        log.error("7z文件压缩出现异常源路径{},目标路径{}", inputFile, outputFile, e);
        throw new RuntimeException("7z文件压缩出现异常");
    } finally {
        // 关闭
        closeSevenZOutputFile(outArchive);
    }

    watch.stop();
    log.info("结束7z压缩本地路径{}的相关日志到{}压缩文件中,耗时{}ms", inputFile, outputFile, watch.getTotalTimeMillis());
}

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2.解压

/**
 * 7z文件解压
 *
 * @param inputFile   待解压文件名
 * @param destDirPath 解压路径
 */
public static void unCompress7z(String inputFile, String destDirPath) throws Exception {
    StopWatch watch = new StopWatch();
    watch.start("7z解缩");
    // 获取当前压缩文件
    File srcFile = new File(inputFile);
    // 判断源文件是否存在
    if (!srcFile.exists()) {
        throw new Exception(srcFile.getPath() + "所指文件不存在");
    }
    // 开始解压
    SevenZFile zIn = new SevenZFile(srcFile);
    SevenZArchiveEntry entry = null;
    File file = null;
    while ((entry = zIn.getNextEntry()) != null) {
        if (!entry.isDirectory()) {
            file = new File(destDirPath, entry.getName());
            if (!file.exists()) {
                // 创建此文件的上级目录
                new File(file.getParent()).mkdirs();
            }
            OutputStream out = new FileOutputStream(file);
            BufferedOutputStream bos = new BufferedOutputStream(out);
            int len = -1;
            byte[] buf = new byte[1024];
            while ((len = zIn.read(buf)) != -1) {
                bos.write(buf, 0, len);
            }
            // 关流顺序，先打开的后关闭
            bos.close();
            out.close();
        }
    }

    watch.stop();
    log.info("结束7z解压,耗时{}ms", watch.getTotalTimeMillis());

}

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3.测试

package com.common.util.sevenz.controller;

import com.common.util.sevenz.SevenZipUtil;
import org.apache.commons.lang3.StringUtils;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.net.URLEncoder;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

/**
 * @author
 * @Describe 功能描述
 * @date
 */
@RestController
public class SevenzTestController {

    String srcPath = "C:\\Users\\kinson\\Desktop\\7zTest";
    String dest7zFilePath = "C:\\Users\\kinson\\Desktop\\7zTest.7z";

    String destPath = "C:\\Users\\kinson\\Desktop\\un7z";

    @RequestMapping(value = "compress7z")
    public void compress7z(HttpServletResponse response, String type) throws IOException {
        if (StringUtils.isEmpty(type)) {
            // 浏览器响应
            // 浏览器响应返回
            response.reset();
            // 设置response的header，response为HttpServletResponse接收输出流
            response.setContentType("application/octet-stream");
            String sevenzFileName = "7zFile-" + LocalDateTime.now().format(DateTimeFormatter.ofPattern(
                    "yyyyMMddHHmmss")) + ".7z";
            response.setHeader("Content-Disposition", "attachment; filename=" + URLEncoder.encode(sevenzFileName, "UTF-8"));

            // 压缩为7z
            SevenZipUtil.compress7z(srcPath, dest7zFilePath);
            // 将压缩好的7z响应给浏览器
            File file = new File(dest7zFilePath);
            if (null != file && file.isFile()) {
                ServletOutputStream os = response.getOutputStream();
                FileInputStream fis = new FileInputStream(file);
                BufferedInputStream bis = new BufferedInputStream(fis);
                int len = -1;
                // 将源文件写入到输出流
                byte[] buf = new byte[1024];
                while ((len = bis.read(buf)) != -1) {
                    os.write(buf, 0, len);
                }

                bis.close();
                fis.close();
                os.close();
            }
        } else {
            // 写到目标文件
            SevenZipUtil.compress7z(srcPath, dest7zFilePath);
        }
    }

    @RequestMapping(value = "unCompress7z")
    public void unCompress7z() throws Exception {
        // 解压
        SevenZipUtil.unCompress7z(dest7zFilePath, destPath);
    }
}

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完整代码见 SevenZipUtil