java spring mvc jsp excel 导入

pom文件添加

<!-- poi jar 解析excel -->
<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi-ooxml</artifactId>
    <version>3.12</version>
</dependency>
<dependency>
    <groupId>commons-fileupload</groupId>
    artifactId>commons-fileupload</artifactId>
</dependency>

spring配置

    <!-- 文件上传表单的视图解析器 -->
    <bean id="multipartResolver"
        class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
    </bean>

jsp页面代码

<button name="importBtn" class="btn btn-primary addExcelBtn" type="button"><i class="fa fa-file-excel-o"></i> 批量导入</button>
......
<!-- excel上传 -->
<form class="fileForm" method="post" enctype="multipart/form-data">
    <input type="file" name="uploadFile" style="display:none;"/>
</form>

js代码

$(".addExcelBtn").unbind('click');
    $(".addExcelBtn").click(function() {
        $(".import").unbind('click');
        $(".import").click(function() {
            $('input[type="file"][name="uploadFile"]').click();
        });

        $('input[type="file"]').unbind("change");
        $('input[type="file"]').change(function () {
            uploadFile();
            $('input[type="file"][name="uploadFile"]').val("");
        });
    });

function uploadFile() {
    var fileName = $('input[type="file"][name="uploadFile"]').val();
    if (fileName === '') {
        frameModal.hitModal("请选择文件");
        return;
    }
    var fileType = (fileName.substring(fileName
            .lastIndexOf(".") + 1, fileName.length))
            .toLowerCase();
    if (fileType !== 'xls' && fileType !== 'xlsx') {
        frameModal.hitModal("文件格式不正确，excel文件！");
        return;
    }

    $(".fileForm").ajaxSubmit({
        dataType : "json",
        data: {'1': 1},
        type: "POST",
        url: 'url',
        success : function(data, textStatus) {
            console.log(data);
        },
        error: function () {
            frameModal.hitModal('操作失败');
        }
    });
};

controller代码

@RequestMapping(value = "/uploadExcel.action", method = RequestMethod.POST)
    @ResponseBody
    public ResponseVo uploadExcel(HttpServletRequest request) {
        // 创建一个通用的多部分解析器
        CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(
                request.getSession().getServletContext());
        // 判断 request 是否有文件上传,即多部分请求
        if (multipartResolver.isMultipart(request)) {
            // 转换成多部分request
            MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest) request;
            MultipartFile file = multiRequest.getFile("uploadFile");
            try {
                //excelUtil工具类
                List<String[]> res = ExcelUtil.readExcel(file);
                if (res != null && res.size() > 0) {
                    //存库或者其他处理逻辑
                }
            } catch (IOException e) {

            }
        }

        return null;
    }

excelUtil工具类

import java.io.FileNotFoundException;  
import java.io.IOException;  
import java.io.InputStream;  
import java.text.DecimalFormat;
import java.util.ArrayList;  
import java.util.List;  

import org.apache.log4j.Logger;  
import org.apache.poi.hssf.usermodel.HSSFWorkbook;  
import org.apache.poi.ss.usermodel.Cell;  
import org.apache.poi.ss.usermodel.Row;  
import org.apache.poi.ss.usermodel.Sheet;  
import org.apache.poi.ss.usermodel.Workbook;  
import org.apache.poi.xssf.usermodel.XSSFWorkbook;  
import org.springframework.web.multipart.MultipartFile; 

/** 
* @ClassName: ExcelUtil 
* @Description: Excel导入导出工具类
*/
public class ExcelUtil {

    private static Logger logger  = Logger.getLogger(ExcelUtil.class);  
    private final static String xls = "xls";  
    private final static String xlsx = "xlsx";  

    /** 
     * 读入excel文件，解析后返回 
     * @param file 
     * @throws IOException  
     */  
    public static List<String[]> readExcel(MultipartFile file) throws IOException{  
        //检查文件  
        checkFile(file);  
        //获得Workbook工作薄对象  
        Workbook workbook = getWorkBook(file);  
        //创建返回对象，把每行中的值作为一个数组，所有行作为一个集合返回  
        List<String[]> list = new ArrayList<String[]>();  
        if(workbook != null){  
            for(int sheetNum = 0;sheetNum < workbook.getNumberOfSheets();sheetNum++){  
                //获得当前sheet工作表  
                Sheet sheet = workbook.getSheetAt(sheetNum);  
                if(sheet == null){  
                    continue;  
                }  
                //获得当前sheet的开始行  
                int firstRowNum  = sheet.getFirstRowNum();  
                //获得当前sheet的结束行  
                int lastRowNum = sheet.getLastRowNum();  
                //循环除了第一行的所有行  
                //for(int rowNum = firstRowNum+1;rowNum <= lastRowNum;rowNum++){  
                int firstColumn = 0;
                for(int rowNum = firstRowNum;rowNum <= lastRowNum;rowNum++){  
                    //获得当前行  
                    Row row = sheet.getRow(rowNum);  
                    if(row == null){  
                        continue;  
                    }  
                    //获得当前行的开始列  
                    //int firstCellNum = row.getFirstCellNum();  
                    int firstCellNum =  0;
                    //获得当前行的列数  
                    int lastCellNum = row.getPhysicalNumberOfCells();
                    if (rowNum == firstRowNum) {
                        firstColumn = lastCellNum;
                    }
                    String[] cells = new String[firstColumn];  
                    //循环当前行  
                    for(int cellNum = firstCellNum; cellNum < firstColumn;cellNum++){  
                        Cell cell = row.getCell(cellNum);  
                        cells[cellNum] = getCellValue(cell);  
                    }  
                    list.add(cells);  
                }  
            }  
            workbook.close();  
        }  
        return list;  
    }  
    public static void checkFile(MultipartFile file) throws IOException{  
        //判断文件是否存在  
        if(null == file){  
            logger.error("文件不存在！");  
            throw new FileNotFoundException("文件不存在！");  
        }  
        //获得文件名  
        String fileName = file.getOriginalFilename();  
        //判断文件是否是excel文件  
        if(!fileName.endsWith(xls) && !fileName.endsWith(xlsx)){  
            logger.error(fileName + "不是excel文件");  
            throw new IOException(fileName + "不是excel文件");  
        }  
    }  
    public static Workbook getWorkBook(MultipartFile file) {  
        //获得文件名  
        String fileName = file.getOriginalFilename();  
        //创建Workbook工作薄对象，表示整个excel  
        Workbook workbook = null;  
        try {  
            //获取excel文件的io流  
            InputStream is = file.getInputStream();  
            //根据文件后缀名不同(xls和xlsx)获得不同的Workbook实现类对象  
            if(fileName.endsWith(xls)){  
                //2003  
                workbook = new HSSFWorkbook(is);  
            }else if(fileName.endsWith(xlsx)){  
                //2007  
                workbook = new XSSFWorkbook(is);  
            }  
        } catch (IOException e) {  
            logger.info(e.getMessage());  
        }  
        return workbook;  
    }  
    public static String getCellValue(Cell cell){ 
        DecimalFormat df = new DecimalFormat("#"); 
        String cellValue = "";  
        if(cell == null){  
            return "";  
        }  
        //把数字当成String来读，避免出现1读成1.0的情况  

        if(cell.getCellType() == Cell.CELL_TYPE_NUMERIC){  
            cell.setCellType(Cell.CELL_TYPE_STRING);  
        }  

        //判断数据的类型  
        switch (cell.getCellType()){  
            case Cell.CELL_TYPE_NUMERIC: //数字  
                //cellValue = String.valueOf(cell.getNumericCellValue());  
                //double c = cell.getNumericCellValue();
                //cellValue = df.format(c);
                //BigDecimal big = new BigDecimal(cell.getNumericCellValue());
                double c = cell.getNumericCellValue();
                cellValue = df.format(c);
                break;  
            case Cell.CELL_TYPE_STRING: //字符串  
                //cellValue = String.valueOf(cell.getStringCellValue());  
                cellValue = cell.getStringCellValue().toString();
                break;  
            case Cell.CELL_TYPE_BOOLEAN: //Boolean  
                cellValue = String.valueOf(cell.getBooleanCellValue());  
                break;  
            case Cell.CELL_TYPE_FORMULA: //公式  
                cellValue = String.valueOf(cell.getCellFormula());  
                break;  
            case Cell.CELL_TYPE_BLANK: //空值   
                cellValue = "";  
                break;  
            case Cell.CELL_TYPE_ERROR: //故障  
                cellValue = "非法字符";  
                break;  
            default:  
                cellValue = "未知类型";  
                break;  
        }  
        return cellValue;  
    }  
}

注意：
1.excel中如果有长数字如果在getCellValue时不把类型转换为字符串类型，可能会导致数字损失精度
2.工具类原方法中解析excel是根据每行中的列数去获取，修改了工具类，如果列获取不到数值，就返回空。