SpringMvc 上传excel（注解和非注解两种方式）

本文转自：http://blog.csdn.net/forever_insist/article/details/51146024

1、第一种方式：

A:JSP页面：

<form name="importForm" action="${ctx }/service/userService/BatchImport.do" method="post" enctype="multipart/form-data">

请选择上传所需文件：<input type="file" id="theFile" name="theFile" /><br/>
<input  type="submit" value="提交"/>
</form>

B: Controller 层

@Controller
@RequestMapping("/service/userService")
public class LoadUserServiceAction  {

    @Reference
    UserHelper userHelper;
    @Reference
    ClassHelper classHelper;
    @Reference
    InstitutionHelper institutionHelper;

    @RequestMapping("/BatchImport")
    public void BatchImport(HttpServletRequest request, HttpServletResponse response)
            throws Exception {
        response.setContentType("application/json");
        response.setCharacterEncoding("utf-8");
        PrintWriter pw = null;
        request.setCharacterEncoding("utf-8");
        int roleID = NumberUtils.toInt(request.getParameter("role"));
        int organID = NumberUtils.toInt(request.getParameter("organ"));
        //是否忽略警告
        boolean ignoreWarning = BooleanUtils.toBoolean(request.getParameter("ignore"));
        MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
        MultipartFile importFile = multipartRequest.getFile("theFile");
            try {
            JSONObject json = new JSONObject();
            json.put("needConfirm", false);
            pw = response.getWriter();
            if(importFile == null){
                json.put("error", "未读取到文件");
                pw.print(json.toString());
            }else{
                Workbook workbook = null;
                String fileName = importFile.getOriginalFilename();
                if(StringUtils.isNotBlank(fileName)){
                    String[] strArr = fileName.split("\\.");
                    if(strArr != null && strArr.length > 0){
                        if("xls".equals(strArr[strArr.length - 1])){
                            workbook = new HSSFWorkbook(importFile.getInputStream());
                        } else if("xlsx".equals(strArr[strArr.length - 1])){
                            workbook = new XSSFWorkbook(importFile.getInputStream());
                        } else {
                            json.put("error", "无法读取的文件格式");
                            pw.print(json.toString());
                        }
                    }
                }

                StringBuilder errorReason = new StringBuilder();
                if(organID < 0){
                    json.put("error", "读取不到正确的机构id");
                    pw.print(json.toString());
                }
                List<Object[]> objsArrList = readExcel(workbook, organID, roleID);
                boolean needConfirm = checkData(objsArrList, roleID, errorReason);
                if(errorReason.length() > 0 && 
                        ( (needConfirm && ! ignoreWarning) || !needConfirm )){
                    json.put("needConfirm", needConfirm);
                    json.put("error", errorReason.toString().replaceAll("\\[|]", ""));
                    pw.print(json.toString());
                }
                userHelper.saveUserObjects(objsArrList);
                pw.print("success");
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if(pw != null){
                pw.flush();
                pw.close();
            }
        }
     }
     /**
     * 检查数据
     * @param objsArrList 对象数组 
     * @param errorReason 错误原因
     */
    private boolean checkData(List<Object[]> objsArrList, int roleID, StringBuilder errorReason){
        //这是省略了检验数据的代码。。。。
    }
/**
     * 读取excel并且形成对象
     * @param workbook 工作簿对象
     * @return
     */
    private List<Object[]> readExcel(Workbook workbook, int organID, int roleID){
        List<Object[]> objsArr = new ArrayList<Object[]>();
        //得到工作簿开始解析数据
        Sheet sheet = workbook.getSheetAt(0);
        //处理数据
    }
}

2、采用注解的方式接受jsp传过来的文件

A: jsp 页面不变
B: Controller 层
其实和上面差不多 主要的区别就是在方法里添加了参数，该参数采用注解的方式，前提条件是要求参数名和jsp中的文件的name值必须一致，否则得到的是null；
具体代码：

   @Controller
@RequestMapping("/service/userService")
public class LoadUserServiceAction  {

    @Reference
    UserHelper userHelper;
    @Reference
    ClassHelper classHelper;
    @Reference
    InstitutionHelper institutionHelper;

    @RequestMapping("/BatchImport")
    public void BatchImport(MultipartFile theFile,HttpServletRequest request, HttpServletResponse response)
            throws Exception {
        response.setContentType("application/json");
        response.setCharacterEncoding("utf-8");
        PrintWriter pw = null;
        request.setCharacterEncoding("utf-8");
        int roleID = NumberUtils.toInt(request.getParameter("role"));
        int organID = NumberUtils.toInt(request.getParameter("organ"));
        //是否忽略警告
        boolean ignoreWarning = BooleanUtils.toBoolean(request.getParameter("ignore"));
        //theFile拿到的就是该文件，然后进行相应的操作
        //和上面的一样
    }
} 

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