java实现单个文件压缩成zip文件前后端实现

问题描述：

一个文件上传后，下载时如果不是压缩文件需要把一个文件打包成zip文件返回给前端；下载时如果是压缩文件直接返回给前端

问题解决：

传入源文件的路径，返回打包后文件的路径

1.java实现FileService层

public String zipFile(String path) throws FileNotFoundException {
    	File file = new File(path);
    	File zipfile = new File(COURSE_META_DOC_SUBDIR,file.getName().substring( 0 , file.getName().lastIndexOf("."))+".zip");
        System.out.println("zip path"+zipfile.getAbsolutePath());
        ZipOutputStream zipOut = new ZipOutputStream(new FileOutputStream(zipfile));
        FileInputStream input = new FileInputStream(file);
        int temp = 0;
		try {
			zipOut.putNextEntry(new ZipEntry(file.getName()));
			while(( temp = input.read())!= -1) {
				zipOut.write(temp);
			}
		} catch (IOException e) {
			System.out.println("error1");
		}finally {
			try {
				input.close();
				zipOut.close();
				//file.delete();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				System.out.println("error2");
			}
		}	
		return zipfile.getAbsolutePath();
		
    }

2.具体业务层CourseService层

如果文件名的后缀不是zip或rar，将他压缩；如果是，直接读取文件。最后以二进制流返回给controlll

public byte[] getFile(String path) throws IOException {
		File file = null;
		
		if (fileService.getSuffix(path) != "zip" || fileService.getSuffix(path) != "rar") {
			String zipPath = fileService.zipFile(path);
			System.out.println("current file path " + path);
			file = new File(zipPath);
			// 把文件压缩成zip
		} else {
			file = new File(path);
		}
		if (!file.exists())
			throw new BusinessException(String.format("课程附件路径'%s'对应的文件不存在", path), ErrorCode.E00001);
		byte[] bb = FileUtils.readFileToByteArray(file);
		return bb;

	}

3.controller层

@RequestMapping(value = COURSE_API + "/file", method = GET)
    @ResponseBody 
    public byte[] getAccessory(@RequestParam String path) throws IOException {	
    	return service.getFile(path);		
    }

4.前端js

使用自定义文件导出函数导出文件

 function downloadFile(){
            courseDao.getFile(vm.course.accessory, function (response) {
                var name = vm.course.accessory.substring(vm.course.accessory.lastIndexOf("\\")+1,vm.course.accessory.length);
                FileExport.export(response,
                    "application/force-download;",
                    name);
            });
        }