Java后台实现浏览器一键导出下载zip压缩包

public abstract class FileComponent {
  /**
   * Description:  递归创建文件夹，或者文件 
   */
  public void mkFile(){
    throw new UnsupportedOperationException();
  }

  /**
   * Description:  获取文件输入路径 
   */
  public String getInPath(){
    throw new UnsupportedOperationException();
  }
  /**
   * Description:  获取文件输出路径
   */
  public String getOutPath(){
    throw new UnsupportedOperationException();
  }
  /**
   * Description:  对于文件夹来说是可以add其他文件夹或者文件
   */
  public void add(FileComponent fileComponent){
    throw new UnsupportedOperationException();
  }
}

public class ZipFileItem extends FileComponent{
  //输入文件的路径
  String inPath;
  //输出文件的路径
  String outPath;
  //子节点文件信息
  List<FileComponent> fileComponents = new ArrayList<FileComponent>();

  //inPath 可以为null
  public ZipFileItem(String outPath){
      this.outPath =outPath;
  }
  //压缩文件的源目录路径和压缩好的目标位置
  public ZipFileItem(String inPath,String outPath){
    this.inPath =inPath;
    this.outPath =outPath;
  }
  public void add(FileComponent fileComponent){
    fileComponents.add(fileComponent);
  }

  public void remove(FileComponent fileComponent){
    fileComponents.remove(fileComponent);
  }
  @Override
  public String getInPath(){
    return inPath;
  }
  @Override
  public String getOutPath(){
    return outPath;
  }
  @Override
  public void mkFile(){
    FileUtils.createFile(inPath, outPath);
    Iterator<FileComponent> iterator = fileComponents.iterator();
    //如果是文件夹，那么还可以迭代文件及对象中的具体文件对象
    while (iterator.hasNext()) {
      FileComponent fileComponent = iterator.next();
      fileComponent.mkFile();
    }
  }
}

public class ConferenceFileUtils {
  /**
   * Description:  根据文件的绝对路径，在绝对的输出路径进行创建文件
   * @param inPath  输入路径，如果是要根据已有的文件来创建，那么一定要传
   * @param outPath  输出路径，如果是目录则不用
   */
  public static void createFile(String inPath,String outPath){
    File fileIn = new File(inPath);
    File fileOut = new File(outPath);
      //如果目标文件已存在，则忽略，如果文件不存在 。则进行创建
      if (!fileOut.exists()) {

        int lastSeparator = outPath.lastIndexOf(File.separator);
        String lastPart = outPath.substring(lastSeparator);
        //如果不是文件夹,则创建文件
        if (lastPart.lastIndexOf(".")!=-1) {
          LoggerUtil.info("----------making concreteFile--------"+outPath);
          FileInputStream in = null;
          FileOutputStream out = null;
          File directory = null; 
              try {
                directory = new File(outPath.substring(0, lastSeparator+1));
                directory.mkdirs();
                out=new FileOutputStream(fileOut);
                //如果源文件存在
                if (fileIn.exists()) {
                  in=new FileInputStream(fileIn); 
                  int len; 
                  byte[] buf=new byte[10240]; 
                  while((len=in.read(buf))>0){ 
                    out.write(buf,0,len); 
                  } 
                  out.close(); 
                  in.close(); 
                  in = null;
                }
              } catch (IOException e) {
                System.err.println("creating file failed!", e);
              }
        }
        //如果是文件夹则创建文件夹，如果父类文件夹不存在，那么也创建
          else {
           System.err.println("----------making directory--------"+outPath);
            fileOut.mkdirs();
          }
      }

  }
  //递归删除文件夹以及文件
  public static boolean deleteDir(File dir) {
    if (dir.isDirectory()) {
      String[] children = dir.list();
      //递归删除目录中的子目录
      for (int i=0; i<children.length; i++) {
        boolean success = deleteDir(new File(dir, children[i]));
        if (!success) {
          return false;
        }
      }
    }
    // 目录此时为空，可以删除
    return dir.delete();
  }
  // 输出文件对象到输出流
    public static void outputFile(File file, HttpServletResponse response) throws IOException {
    OutputStream out=null;
    FileInputStream in=null;
    try {
    byte[] src = new byte[1024];
     out = response.getOutputStream();
     in = new FileInputStream(file);
    int len=0;
    while ((len = in.read(src)) > 0) {
      out.write(src, 0, len);
    }
    out.flush();
    out.close();
    in.close();
    } catch (IOException e) {
      throw new IOException(e);
    }finally{
      if(null!=out){
        FortifyUtil.commonReleasedResource(out);
      }
      if(null!=in){
        FortifyUtil.commonReleasedResource(in);
      }
    }

  }
}

public class exportMaterialToZipTemplate {

  @Resource
  private EnrichFileLevelsService enrichFileLevelsService;
  //根目录文件夹名称 or 下载浏览器文件名
  private String downloadZipName;
  //根目录地址
  private String savePath = "d:\\tempFile";
  //根目录路径
  private String superRootPath;
  //根目录对象
  private FileComponent superRoot;
  //业务参数DTO
  private ExportAllTheMaterialDTO paramDTO;
  //response
  private HttpServletResponse response;

  public exportMaterialToZipTemplate(ExportAllTheMaterialDTO paramDTO,EnrichFileLevelsService enrichFileLevelsService,HttpServletResponse response) {
    this.downloadZipName = paramDTO.getDownloadZipName();
    this.paramDTO = paramDTO;
    this.response = response;
    this.enrichFileLevelsService = enrichFileLevelsService;
    this.superRootPath =savePath+File.separator+downloadZipName;
    this.superRoot = new ZipFileItem(superRootPath); 
  }  

  //1.封装根目录
  private void enrichFileLevels(){
    enrichFileLevelsService.enrichFileLevels(superRoot,superRootPath,paramDTO);
  }
  //2.生成文件目录层级，即创建所有的文件（包括文件夹）
  private void createAllTheFiles(){
    if (null!=superRoot) {
      superRoot.mkFile();
    }
  }
  //3.生成文件层级后后再压缩后下载到浏览器
  private void compressAndDownload() {
    File srcFile = new File(FortifyUtil.filterFileName(superRootPath));
    String targetFilePath = savePath+File.separator+srcFile.getName()+".zip";
    File targetFile = new File(FortifyUtil.filterFileName(targetFilePath));
    ZipFileUtil.zipFiles(srcFile,targetFile);
    try {
      //压缩文件临时路径
      String downFileName = downloadZipName+".zip";
      response.reset();
      // 定义输出类型
      response.setContentType("application/octet-stream");
      response.setHeader("content-disposition", "attachment;filename="
          + new String(downFileName.getBytes("GBK"), "ISO-8859-1")
          + ";size=" + targetFile.length());
      OutputFileUtil.outputFile(targetFile, response);
      // 删除临时存放的文件夹
      if (srcFile.exists()) {
        ConferenceFileUtils.deleteDir(srcFile);
      }
      //删除临时的压缩包
      if (targetFile.exists()) {
        targetFile.delete();
      }
    } catch (IOException e) {
      DevLog.error(e.getMessage());
    }
  }
  //一键导出,外观模式
  public void export() {
    enrichFileLevels();
    createAllTheFiles();
    compressAndDownload();
  }
}

public interface EnrichFileLevelsService {
  public void enrichFileLevels(FileComponent superRoot,String superRootPath,ExportAllTheMaterialDTO paramDTO);
}