java SpringMVC实现文件压缩，文件下载

Myth丶恋晨 2021-09-24 18:04 433阅读 0赞

文件压缩后，下载

前端代码：

后端代码：

package gov.zhbs.web;
    
    import org.apache.commons.collections4.CollectionUtils;
    import org.apache.commons.compress.archivers.ArchiveException;
    import org.apache.commons.compress.archivers.ArchiveOutputStream;
    import org.apache.commons.compress.archivers.ArchiveStreamFactory;
    import org.apache.commons.compress.archivers.zip.ZipArchiveEntry;
    import org.apache.commons.io.IOUtils;
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestMethod;
    
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import java.io.ByteArrayOutputStream;
    import java.io.IOException;
    import java.io.OutputStream;
    import java.net.URLEncoder;
    import java.util.HashMap;
    import java.util.Map;
    
    
    @Controller
    @RequestMapping("/attachmentUploadBean")
    public class DownloadController {
    
    	private static final String GBK = "GBK";
    
    
    	/**
    	 * 将所有附件打包并下载
    	 * @param session
    	 * @param request
    	 * @param response
    	 * @param attachmentSessionKey
    	 */
    	@RequestMapping(value = "/downloadAttachment", method = RequestMethod.GET)
    	public void downloadAttachment(HttpServletRequest request, HttpServletResponse response, String attachmentSessionKey){
    		//将需要压缩的文件添加到这里
    		Map<String, byte[]> unpackResult = new HashMap<String, byte[]>();
    		byte[]fileDatas1 = null;
    		byte[]fileDatas2 = null;
    		unpackResult.put("照片1.jpg",fileDatas1);
    		unpackResult.put("照片2.jpg",fileDatas2);
    
    		if(CollectionUtils.isNotEmpty(unpackResult.keySet())){
    			// 对文件进行压缩
    			byte[] fileDatas = filePack(unpackResult);
    			try {
    				String mimeType = request.getSession().getServletContext().getMimeType(".zip");
    				if (mimeType == null) {
    					mimeType = "application/octet-stream";
    				}
    				response.setContentType(mimeType);
    				String headerKey = "Content-Disposition";
    				String headerValue = String.format("attachment; filename=\"%s\"", URLEncoder.encode("一键下载附件.zip", "utf-8"));
    				response.setHeader(headerKey, headerValue);
    				response.setHeader("Content-Length", String.valueOf(fileDatas.length));
    				response.getOutputStream().write(fileDatas);
    				response.flushBuffer();
    			} catch (Exception e) {
    				e.printStackTrace();
    			}
    		}
    	}
    
    
    
    
    
    	public static byte[] filePack(Map<String, byte[]> datas){
    		try {
    			ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
    			ArchiveOutputStream out = createOutputStream(byteArrayOutputStream);
    			for (String name : datas.keySet()) {
    				pack(out, datas.get(name), name);
    			}
    			out.close();
    			return byteArrayOutputStream.toByteArray();
    		} catch (Exception e) {
    			e.printStackTrace();
    		}
    		return null;
    	}
    
    
    	private static ArchiveOutputStream createOutputStream(OutputStream out) throws ArchiveException {
    		ArchiveStreamFactory factory = new ArchiveStreamFactory();
    		factory.setEntryEncoding(GBK);
    		return factory.createArchiveOutputStream(ArchiveStreamFactory.ZIP, out);
    	}
    
    
    
    
    	private static void pack(ArchiveOutputStream out, byte[] data, String fileName) {
    		try {
    			// 压缩进zip
    			out.putArchiveEntry(new ZipArchiveEntry(fileName));
    			IOUtils.write(data, out);
    			out.closeArchiveEntry();
    		} catch (IOException e) {
    			e.printStackTrace();
    		}
    	}
    
    	
    	
    
    
    }

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