maven依赖：
<!-- https://mvnrepository.com/artifact/com.github.junrar/junrar -->
<dependency>
    <groupId>com.github.junrar</groupId>
    <artifactId>junrar</artifactId>
    <version>2.0.0</version>
</dependency>

在使用该jar包进行解析时候引发的内存爆满机器卡死，如图：

看源码发现每一次解压都new了一个线程，但是却没有对线程进行管理，改造如下：

代码示例：

private void extractRarFile(InputStream inputStream) {
        UnRarUtils archive = null;
        InputStream is = null;
        try {
            // 解析文件
            archive = new UnRarUtils(inputStream);
            if (archive == null) {
                throw new FileNotFoundException(" not found!");
            }
            if (archive.isEncrypted()) {
                throw new Exception(" is encrypted!");
            }
            List<FileHeader> files = archive.getFileHeaders();
            if (files.size() == 0) {
                return ;
            }

            for (FileHeader fh : files) {
                try (BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(new FileOutputStream("d:\\子文件")))){
                    // 判断子文件是否加密
                    if (fh.isEncrypted()) {
                        continue;
                    }

                    // 获取文件名
                    String fileName;
                    if (StringUtils.isNotBlank(fh.getFileNameW())) {
                        fileName = fh.getFileNameW();
                    } else if (StringUtils.isNotBlank(fh.getFileNameString())) {
                        fileName = fh.getFileNameString();
                    } else {
                        continue;
                    }

                    // 获取子文件字节流
                    is = archive.getInputStream(fh);
                    byte[] bytes = IOUtils.toByteArray(is);
                    if (bytes.length <= 0) {
                        continue;
                    }
                    is.close();
                    
                    // 输出子文件
                    writer.write(new String(bytes));
                    return;
                } catch (Exception e) {
                    throw new RuntimeException("exception");
                } finally {
                    try {
                        if (is != null) {
                            is.close();
                        }
                    } catch (Exception e) {

                    }
                }
            }
            archive.close();
            inputStream.close();
        } catch (Exception e) {

        } finally {
            try {
                if (archive != null) {
                    archive.close();
                }
                if (inputStream != null) {
                    inputStream.close();
                }
            } catch (IOException e) {

            }
        }
        return;
    }