file和multipartfile相互转化及其poi提取图片

红太狼 2022-11-19 07:54 266阅读 0赞

### 文章目录 ###

*  一，poi导入excel时提取图片
 *  二，byte数组和MultipartFile户转
 *  三，file转MultipartFile
 *  四，解压zip包

# 一，poi导入excel时提取图片 #

上传的excel

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDAwMTk2NQ_size_16_color_FFFFFF_t_70][]

FileInputStream fs = (FileInputStream) file1.getInputStream();
                HSSFWorkbook workbook = null;
                if (".xls".equals(suffix)) { 
                    workbook = new HSSFWorkbook(fs);
                } else if (".xlsx".equals(suffix)) { 
                    workbook = (HSSFWorkbook) WorkbookFactory.create(fs);
                }
                ...

//基本信息
            HSSFSheet sheet_jbxx = (HSSFSheet) workbook.getSheetAt(3);
            import_jbxx(sheet_jbxx,fileName, uuid,request);

//获取头像
                List<HSSFShape> list = sheet_jbxx.getDrawingPatriarch().getChildren();
                SAttachmentFile attachmentFile = null;
                for (HSSFShape shape : list) { 
                    if (shape instanceof HSSFPicture) { 
                        HSSFPicture picture = (HSSFPicture) shape;
                        HSSFClientAnchor cAnchor = (HSSFClientAnchor) picture.getAnchor();
                        HSSFPictureData pdata = picture.getPictureData();
                        //获取第几行
                        HSSFClientAnchor anchor = (HSSFClientAnchor) shape.getAnchor();
                        //获取行编号
                        int row = anchor.getRow2();
                        //获取列编号
                        int col = anchor.getCol2();
                        if(row!=1&&row==6&&col==4){ 
                            //文件字节数组
                            byte[] data = pdata.getData();
                            InputStream inputStream = new ByteArrayInputStream(data);
                            MultipartFile file = new MockMultipartFile("test.jpg","test.jpg",ContentType.APPLICATION_OCTET_STREAM.toString(), inputStream);
                            String path="rygl/picture";
                            attachmentFile = fileManagerService.uploadFile(file,path);
                        }else if(row!=1&&(row!=6||col!=4)){ 
                            isshow=true;
                            jgMsg.append("文件名："+fileName+"，提示：照片读取失败，请在指定单元格内放置照片！；\r\n");
                        }
    
                    }
                }
                if(attachmentFile!=null){ 
                    a01.setZdyxa0106(attachmentFile.getFid());
                }

其中有一个byte数组转为MultipartFile的过程

# 二，byte数组和MultipartFile户转 #

> MultipartFile转化为byte数组  
> byte\[\] imgBytes = multipartFile.getBytes();

byte数组转化为MultipartFile

转换中我们会使用MockMultipartFile这个类，所有要引用相应包。

<dependency>
                       <groupId>org.springframework</groupId>
                       <artifactId>spring-test</artifactId>
                       <version>RELEASE</version>
                    </dependency>

byte[] testFile = new byte[1024];
    InputStream inputStream = new ByteArrayInputStream(testFile);
    MultipartFile file = new MockMultipartFile(ContentType.APPLICATION_OCTET_STREAM.toString(), inputStream);

# 三，file转MultipartFile #

引入以下依赖

<dependency>
        <groupId>commons-fileupload</groupId>
        <artifactId>commons-fileupload</artifactId>
        <version>1.3.1</version>
    </dependency>

public class FileUtil { 
        public MultipartFile fileToMultipartFile(File file) { 
            FileItem fileItem = createFileItem(file);
            MultipartFile multipartFile = new CommonsMultipartFile(fileItem);
            return multipartFile;
        }
        private static FileItem createFileItem(File file) { 
            FileItemFactory factory = new DiskFileItemFactory(16, null);
            FileItem item = factory.createItem("textField", "text/plain", true, file.getName());
            int bytesRead = 0;
            byte[] buffer = new byte[8192];
            try { 
                FileInputStream fis = new FileInputStream(file);
                OutputStream os = item.getOutputStream();
                while ((bytesRead = fis.read(buffer, 0, 8192)) != -1) { 
                    os.write(buffer, 0, bytesRead);
                }
                os.close();
                fis.close();
            } catch (IOException e) { 
                e.printStackTrace();
            }
            return item;
        }
    }

注意：导入的是org.apache.commons下的包

# 四，解压zip包 #

private void unzipAndImportExcels(MultipartFile file,HttpServletRequest request) throws IOException, InvalidFormatException, ParseException { 
            //存放解压后的文件目录
            String destDirPath="D:\\工作\\北软工具和工作文件\\冬奥人员信息导入数据材料\\test\\";
            File tempDir=new File(destDirPath);
            //初始化临时目录
            FileUtils.cleanDirectory(tempDir);
            File file1 = new File(destDirPath+file.getOriginalFilename());
    
            FileUtils.copyInputStreamToFile(file.getInputStream(), file1);
            ZipFile zipFile=new ZipFile(file1, Charset.forName("GBK"));
            Enumeration<?> entries = zipFile.entries();
            while (entries.hasMoreElements()) { 
                ZipEntry entry = (ZipEntry) entries.nextElement();
                // 如果是文件夹，就创建个文件夹
                if (entry.isDirectory()) { 
                    String dirPath = destDirPath + File.separator + entry.getName();
                    File dir = new File(dirPath);
                    dir.mkdirs();
                }else{ 
                    // 如果是文件，就先创建一个文件，然后用io流把内容copy过去
                    File targetFile = new File(destDirPath + File.separator + entry.getName());
                    // 保证这个文件的父文件夹必须要存在
                    if (!targetFile.getParentFile().exists()) { 
                        targetFile.getParentFile().mkdirs();
                    }
                    targetFile.createNewFile();
                    // 将压缩文件内容写入到这个文件中
                    InputStream is = zipFile.getInputStream(entry);
                    FileOutputStream fos = new FileOutputStream(targetFile);
                    int len;
                    byte[] buf = new byte[1024];
                    while ((len = is.read(buf)) != -1) { 
                        fos.write(buf, 0, len);
                    }
                    // 关流顺序，先打开的后关闭
                    fos.close();
                    is.close();
    
                }
            }
            zipFile.close();
            //删除压缩包
            FileUtils.forceDelete(file1);
    }

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