Java上传Excel并解析

1.上传：

public String uploadFile(CommonsMultipartFile file,String uploadPath,String realUploadPath){
        InputStream is = null;
        OutputStream os = null;
        Calendar calendar = Calendar.getInstance();//获取时间
        long excelName = calendar.getTime().getTime();  

        try {
            is = file.getInputStream();
            String des = realUploadPath + "/"+Long.toString(excelName)+file.getOriginalFilename();
            os = new FileOutputStream(des);  

            byte[] buffer = new byte[1024];
            int len = 0;  

            while((len = is.read(buffer))>0){
                os.write(buffer);
            }  

        } catch (Exception e) {
            e.printStackTrace();
        }finally{
            if(is!=null){
                try{
                    is.close();
                }catch (Exception e2){
                    e2.printStackTrace();
                }
            }  

            if(os!=null){
                try{
                    os.close();
                }catch (Exception e2){
                    e2.printStackTrace();
                }
            }
        }
        //返回路径
        return uploadPath + "/"+Long.toString(excelName)+file.getOriginalFilename();
    }  

2.解析：

常用的Excel解析方式有两种JXL,POI

jxl用起来相对简单，但只支持Excel2003版本，也就是说jxl无法解析.xlsx的Excel文件，而POI会识别Excel版本进行解析，所以大部分人更倾向于POI

jxl使用时需要在项目中导入jxl.jar包

poi需要导入

poi-3.14-20160307.jar

poi-ooxml-3.14-20160307.jar

poi-ooxml-schemas-3.14-20160307.jar

commons-io-1.4.jar

commons-fileupload-1.2.1.jar

2.1   JXL解析代码：

    public String readExcel(CommonsMultipartFile file,HttpServletRequest request)throws IOException, WriteException{  

            StringBuffer sb = new StringBuffer();//将读取的内容存入StringBUffer中
            try {
                Workbook book = Workbook.getWorkbook(file.getInputStream());
                try{
                    Sheet sheet = book.getSheet(0);
                    for(int i = 0 ; i < 3 ; i++){//i表示行数
                        for(int j = 0 ; j < 4 ; j++){//j表示列数
                            sb.append(sheet.getCell(j, i).getContents()+"\t");
                        }
                        sb.append("\n");
                    }
                    System.out.println(sb);
                }finally{
                    if(book != null){
                        book.close();
                    }
                }
            } catch (BiffException e) {
                System.err.println(e+"");
            } catch (IOException e) {
                System.err.println(e+"文件读取错误");
            }
            return "";
        }  

2.2   POI解析代码：

 private POIFSFileSystem fs;
   private HSSFWorkbook wb;
   private HSSFSheet sheet;
   private HSSFRow row;
   /*读取标题excel第一行内容*/
public String[] readExcelTitle(InputStream is) {
       try {
           fs = new POIFSFileSystem(is);
           wb = new HSSFWorkbook(fs);
       } catch (IOException e) {
           e.printStackTrace();
       }
       sheet = wb.getSheetAt(0);
       row = sheet.getRow(0);
       // 标题总列数
       int colNum = row.getPhysicalNumberOfCells();
       System.out.println("colNum:" + colNum);
       String[] title = new String[colNum];
       for (int i = 0; i < colNum; i++) {
           //title[i] = getStringCellValue(row.getCell((short) i));
           title[i] = getCellFormatValue(row.getCell((short) i));
       }
       return title;
   }
/*读取内容*/
 public void readExcelContent(InputStream is) {
       Map<Integer, ModelCourse> content = new HashMap<Integer, ModelCourse>();
       ModelCourse model=new ModelCourse();
       try {
           fs = new POIFSFileSystem(is);
           wb = new HSSFWorkbook(fs);
       } catch (IOException e) {
           e.printStackTrace();
       }
       sheet = wb.getSheetAt(0);
       // 得到总行数
       int rowNum = sheet.getLastRowNum();
       row = sheet.getRow(0);
       int colNum = row.getPhysicalNumberOfCells();  

       // 正文内容从第二行开始,第一行为表头的标题
       for (int i = 1; i <=rowNum; i++) {
           row = sheet.getRow(i);
           int j = 0;  

           while (j < colNum) {  

            if(j==1){
                model.setCourse_id(getCellFormatValue(row.getCell((short) j)));
            }
            else if(j==2){
                model.setCourse_name(getCellFormatValue(row.getCell((short) j)));
            }
            else if(j==3){
                model.setCourse_time(getCellFormatValue(row.getCell((short) j)));
            }
            else if(j==4){
                model.setCourse_place(getCellFormatValue(row.getCell((short) j)));
            }
               j++;  

           }
           content.put(i, model);
           addCourse(model);
       }
   }