java利用jxl实现Excel导入功能

本次项目实践基于Spring+SpringMvc+MyBatis框架，简单实现了Excel模板导出、和Excel批量导入的功能。实现过程如下：、

1、maven导入所需jar包

        <dependency>
            <groupId>net.sourceforge.jexcelapi</groupId>
            <artifactId>jxl</artifactId>
            <version>2.6.12</version>
        </dependency>

2、创建Excel导出模板

import java.io.OutputStream;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.springframework.web.servlet.view.document.AbstractExcelView;

public class CommodityTypeImportModelExcel extends AbstractExcelView {

    @Override
    protected void buildExcelDocument(Map<String, Object> map, HSSFWorkbook workBook, HttpServletRequest request,
            HttpServletResponse response) throws Exception {
        HSSFSheet sheet = workBook.createSheet("Sheet1");
        sheet.setDefaultColumnWidth(20);
        HSSFCell cell00 = getCell(sheet, 0, 0);
        setText(cell00, "商品类型名称");
        HSSFCell cell01 = getCell(sheet, 0, 1);
        setText(cell01, "上级类型");
        HSSFCell cell02 = getCell(sheet, 0, 2);
        setText(cell02, "级别");

        String filename = new String("商品类型模板.xls".getBytes("utf-8"), "iso8859-1");
        response.setHeader("Content-Type", "application/octet-stream");
        response.setHeader("Content-disposition", "attachment;filename=" + filename);
        OutputStream ouputStream = response.getOutputStream();
        workBook.write(ouputStream);
        ouputStream.flush();
        ouputStream.close();
    }
}

3、controller端实现模板导出

　　 @RequestMapping(value = "/testTypeExcelExport", method = RequestMethod.GET)
    public ModelAndView testTypeExcelExport(HttpServletRequest request, ModelMap model) {
        CommodityTypeImportModelExcel commodityTypeImportModelExcel = new CommodityTypeImportModelExcel();
        return new ModelAndView(commodityTypeImportModelExcel);
    }

4、在Html添加模板导出控件

 <a id="downloadTypeModel">商品类型字典模板下载</a>

<script type="text/javascript">
$(document).ready(function(){
    $("#downloadTypeModel").on("click",function(){
        location.href ="${pageContext.request.contextPath}/shop/testTypeExcelExport";
    });
});
</script>

5、创建需要导入Excel的实体

import java.util.Date;

public class CommodityTypeDicEntity {

    private Integer id;

    private String typeName;

    private String pName;

    private String level;

    private Date createTime;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getTypeName() {
        return typeName;
    }

    public void setTypeName(String typeName) {
        this.typeName = typeName;
    }

    public String getpName() {
        return pName;
    }

    public void setpName(String pName) {
        this.pName = pName;
    }

    public String getLevel() {
        return level;
    }

    public void setLevel(String level) {
        this.level = level;
    }

    public Date getCreateTime() {
        return createTime;
    }

    public void setCreateTime(Date createTime) {
        this.createTime = createTime;
    }

}

6、Server层利用JXL获取Excel是数据并将数据添加到List中，返回

import jxl.Sheet;
      import jxl.Workbook;

  /**
     * 利用JXL获取Excel数据并将数据添加到List
     * @param file
     * @return
     */
    public List<CommodityTypeDicEntity> getAllTypeByExcel(MultipartFile file){
        List<CommodityTypeDicEntity> list=new ArrayList<CommodityTypeDicEntity>();
        try {
            Workbook rwb=Workbook.getWorkbook(file.getInputStream());
            Sheet rs=rwb.getSheet("Sheet1");//或者rwb.getSheet(0)
            //校验
            if(null==rs){
                //throw new Exception("表格不存在！");
                return null;
            }
            int clos=rs.getColumns();//得到所有的列
            int rows=rs.getRows();//得到所有的行

            for (int i = 1; i < rows; i++) {
                for (int j = 0; j < clos; j++) {
                    //第一个是列数，第二个是行数
                    String typeName=rs.getCell(j++, i).getContents();//默认最左边编号也算一列 所以这里得j++
                    String pName=rs.getCell(j++, i).getContents();
                    String level=rs.getCell(j++, i).getContents();

                    CommodityTypeDicEntity commodityTypeDicEntity = new CommodityTypeDicEntity();
                    commodityTypeDicEntity.setTypeName(typeName);
                    commodityTypeDicEntity.setpName(pName);
                    commodityTypeDicEntity.setLevel(level);
                    commodityTypeDicEntity.setCreateTime(new Date());
                    list.add(commodityTypeDicEntity);
                }
            }

        } catch (Exception e) {
            // TODO Auto-generated catch block
            //e.printStackTrace();
            logger.error("解析Excel出错",e);
        } finally {
            try {
                file.getInputStream().close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                //e.printStackTrace();
                logger.error("文件流关闭出错",e);
            }
        }
        return list;

    }

7、Dao层添加批量插入方法及清空数据方法

     /**
     * 批量插入商品类型
     * @param listInsert
     * @return
     */
    int createCommodityTypeDicList(List<CommodityTypeDicEntity> listInsert);

    /**
     * 清空商品类型
     * @return
     */
    int deleteCommodityTypeDic();

对应Mapping中：

 <insert id="createCommodityTypeDicList" parameterType="java.util.List">
    INSERT INTO shell_commodity_type_dic
    <trim prefix="(" suffix=")" suffixOverrides=",">
    type_name,p_name,level,create_time,
    </trim>
    VALUES
    <foreach collection="list" item="item" index="index" separator=",">
    <trim prefix="(" suffix=")" suffixOverrides=",">
        #{item.typeName,jdbcType=VARCHAR},
        #{item.pName,jdbcType=VARCHAR},
        #{item.level,jdbcType=VARCHAR},
        #{item.createTime,jdbcType=TIMESTAMP},
    </trim>
    </foreach>
 </insert>

 <delete id="deleteCommodityTypeDic" parameterType="int">
        delete from shell_commodity_type_dic
 </delete>

8、Server层加入Excel导入及数据清空

   /**
     *
     * @param commodityDics
     * @return
     */
    public Map<String, Object> saveCommodityTypeDic(List<CommodityTypeDicEntity> commodityTypeDics) {
        //清空商品类型
        commodityDao.deleteCommodityTypeDic();

        Map<String, Object> resultMap = new HashMap<String, Object>();
        int count = 0;
        count = commodityDao.createCommodityTypeDicList(commodityTypeDics);

        if(count == commodityTypeDics.size()){
            resultMap.put("resultCode", "0");
            resultMap.put("resultMsg", "成功导入"+count+"条数据!");
            return resultMap;
        }else{
            resultMap.put("resultCode", "103");
            resultMap.put("resultMsg", "导入失败，请检查导入数据是否正确。");
            return resultMap;
        }
    }

9、controller端实现Excel批量导入

    @RequestMapping(value = "/testTypeExcelImport", method = RequestMethod.POST)
    @ResponseBody
    public Map<String, Object> testTypeExcelImport(HttpServletRequest request, ModelMap model) throws Exception {
        Map<String, Object> resultMap = new HashMap<String, Object>();
        MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
        MultipartFile file = multipartRequest.getFile("commodityTypeExcel");
        if(file.isEmpty()){
            resultMap.put("resultCode", "101");
            resultMap.put("resultMsg", "导入失败，文件为空，请检查。");
            return resultMap;
        }
        List<CommodityTypeDicEntity> commodityTypeDics = commodityService.getAllTypeByExcel(file);
        if(commodityTypeDics.size()==0){
            resultMap.put("resultCode", "102");
            resultMap.put("resultMsg", "导入失败，数据不存在，请检查导入信息。");
            return resultMap;
        }
        resultMap = commodityService.saveCommodityTypeDic(commodityTypeDics);
        return resultMap;
    }

10、Html添加批量导入控件

<a id="batchTypeImport">商品类型字典批量导入</a>
<form id="uploadCommodityTypeExcel" style="display:none" name="uploadCommodityTypeExcel" method="post" enctype="multipart/form-data" >
<input type="file" style="display:none" name="commodityTypeExcel" id="commodityTypeExcel" onChange="uploadType()"/>
<input type="submit" style="display:none" id="commodityTypeExcelSubmit">
</form>

对应Js部分

<script type="text/javascript">
$(document).ready(function(){
    // 使用 jQuery异步提交表单
    $('#commodityTypeExcelSubmit').click(function() {
             var file = $("#commodityTypeExcel").val();
             if (file == "") {
                 alert("请选择要上传的文件");
                 return false;
             } else {
                 //检验文件类型是否正确
                 var exec = (/[.]/.exec(file)) ? /[^.]+$/.exec(file.toLowerCase()) : '';
                 if (exec != "xls") {
                     alert("文件格式不对，请上传Excel文件!(扩展名xls)");
                     return false;
                 }
             }
            $('#uploadCommodityTypeExcel').ajaxSubmit({
                url:'${pageContext.request.contextPath}/shop/testTypeExcel',
                data:$('#uploadCommodityTypeExcel').serialize(),
                type:"POST",
                beforeSend:function()
                {
                    ajaxbg.show();
                },
                success:function(msg)
                {
                    ajaxbg.hide();
                    alert(msg.resultMsg);
                },
                error:function(){
                    ajaxbg.hide();
                    alert("导入失败!");
                }
            });
            return false;
        });
});

function uploadType(){
   $("#commodityTypeExcelSubmit").click();
}
</script>

自此利用JXl进行批量导入的功能基本完成。

需要注意的点：在第【9】如果出现MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;报错，无法被成功转换，则需要确认：

1、首先在servlet.xml里是否进行了配置（SpringMVC封装了commons-fileupload上传组件）

<bean id="multipartResolver"
        class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <property name="maxUploadSize" value="31457280" />
        <property name="maxInMemorySize" value="4096" />
    </bean>

2、需要检查一下form表单是否有这个属性enctype="multipart/form-data"，对比第【10】步。

3、是否以提交方式进行的导入请求，对比第【10】步中的js部分。

$('#uploadCommodityTypeExcel').ajaxSubmit，这个比较关键。

页面在批量导入时需要在页面上出现“正在导入。。。”遮罩效果的，请参考：http://www.cnblogs.com/conswin/p/7251341.html