POI导入Excel

今天是POI对excel导入导出时，出现了一些问题，因为excel的文件格式众多：

项目中对.xls格式是支持的，但是现在有了.xlsx格式，项目就会报出异常：

 NoClassDefFoundError: org/apache/poi/ss/usermodel/AutoFilt

搞了很久最后怀疑poi-ooxml和poi的兼容性问题,最后在pom文件中对poi依赖进行了修改，由：

		<dependency>
			<groupId>org.apache.poigroupId>
			<artifactId>poi-ooxmlartifactId>
			<version>3.7version>
		dependency>
		<dependency>
			<groupId>org.apache.poigroupId>
			<artifactId>poiartifactId>
			<version>3.6version>
		dependency>

改成了：

		<dependency>
			<groupId>org.apache.poigroupId>
			<artifactId>poi-ooxmlartifactId>
			<version>3.7version>
		dependency>
		<dependency>
			<groupId>org.apache.poigroupId>
			<artifactId>poiartifactId>
			<version>3.7version>
		dependency>

没错，只是把两个依赖的version改为一样，问题解决。

附上Java项目如何导入excel项目级实现：

首先controller层：

    @RequestMapping(value = "/importExcel", method = RequestMethod.POST)
    public Object importExcel(@RequestParam("excel") MultipartFile file, HttpServletRequest request, HttpServletResponse response){
        return svc.importExcel(file);
    }

Service层对file进行处理：

	/**
	 * 文件导入
	 * @param file
	 * @return
	 */
	@SuppressWarnings("unchecked")
	@Transactional
	public Map<String, Object> importExcel(MultipartFile file){
		// 判断文件是否为空
		if (file.isEmpty()){
			return comnSvc.invalidMessage("importNullExcel");
		}
		// 判断文件类型是否为excel
		String type = file.getContentType();
		if (!("application/vnd.ms-excel".equals(type) || "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet".equals(type))){
			return comnSvc.invalidMessage("fileTyleError");
		}
		//excel的头部
		String[] header = {"a", "b", "c","d","e","f","g","h"};
		//解析excel
		Map<String, Object> excelResult = excelImportSvc.getInfoFromFile(file, header, 3,null);
		int status = Integer.parseInt(String.valueOf(excelResult.get("status")));
		//为0则出现错误
		if (status == 0) return excelResult;
		List<List<Map<String, Object>>> resultList = (List<List<Map<String, Object>>>)excelResult.get("data");
		//得到sheet为0页的数据
		List<Map<String, Object>> rjzList = resultList.get(0);
		
		return null;

	}

这里用到了导入工具类ExcelImportService：

package com.inspur.ykj.service;

import java.io.IOException;
import java.io.InputStream;
import java.text.DateFormat;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.poi.ss.usermodel.*;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;

@Service
public class ExcelImportService {
    @Autowired
    CommonService commonServ;
    
    /**
     * 
     * 读取excel
     *
     * @param file
     * @param header 对应excel的表头,存放到map中的key
     * @param startReadRow 开始读取的行号
     * @param from 预留字段,添加个性化需求
     * @return
     */
    public Map<String,Object>  getInfoFromFile(MultipartFile file,String[] header,int startReadRow,String from) {
        Map<String,Object> result = new HashMap<>();
        //解析文件
        InputStream inputStream = null;
        Workbook excel = null;
        try {
            inputStream = file.getInputStream();
            excel = WorkbookFactory.create(inputStream);
            Sheet sheet = null;
            sheet = excel.getSheetAt(0);
            if (sheet.getLastRowNum() < startReadRow-1){
                
                return commonServ.invalidMessage("emptyTemplet");
            }
            Cell cell = null;
            List<List<Map<String,String>>> sheetList = new ArrayList<>();
            List<Map<String, String>> resultList = new ArrayList<Map<String, String>>();
            for (int rowIndex = startReadRow-1; rowIndex <= sheet.getLastRowNum(); rowIndex++) {
                Row row = sheet.getRow(rowIndex);
                if (row == null){
                    break;
                }
                Map<String, String> rowMap = new HashMap<String, String>();
                for (int columnIndex = 0; columnIndex < header.length; columnIndex++) {
                	String value = "";
                    cell = row.getCell(columnIndex);
                    if (cell != null) {
                        switch (cell.getCellType()) {
                            case Cell.CELL_TYPE_STRING:// 1-字符串
                                value = cell.getStringCellValue();
                                break;
                            case Cell.CELL_TYPE_NUMERIC:// 0-数值
                                // 如果格式为数值,自定义格式输出
                                if(DateUtil.isCellDateFormatted(cell)){
                                    Date date = cell.getDateCellValue();
                                    DateFormat formater = new SimpleDateFormat("yyyyMMdd");
                                    value = formater.format(date);
                                }else {
                                    DecimalFormat df = new DecimalFormat("#.##");
                                    value = df.format(cell.getNumericCellValue());
                                }
                                break;
                            case Cell.CELL_TYPE_BOOLEAN: // 4-布尔
                                // 导入时如果为BOOLEAN型 自定义格式输出
                                value = (cell.getBooleanCellValue() ? "Y" : "N");
                                break;
                            case Cell.CELL_TYPE_FORMULA:// 2-公式
                            	try {
                            		value = String.valueOf(cell.getStringCellValue());
                            	} catch (IllegalStateException e) {
                            		value = String.valueOf(cell.getNumericCellValue());
                            	}
                            	break;
                                // 导入时如果为公式生成的数据则无值
                            case Cell.CELL_TYPE_BLANK: // 3-空格
                            case Cell.CELL_TYPE_ERROR: // 5-错误
                            	value = String.valueOf(cell.getStringCellValue());
                                break;
                            default:
                                break;
                        }
                    }

                    if(!header[columnIndex].equals(""))
                        rowMap.put(header[columnIndex], value);
                }
                //循环放入的这一行的map是否全是空，如果全是空则不放
                for(String str:rowMap.values()){
                	if (!(str==null||str.length()==0)) {
                		resultList.add(rowMap);
                		break;
                	}
                }
            }
            sheetList.add(resultList);

            result.put("status", 1);
            result.put("data", sheetList);

        }catch (Exception e){
            e.printStackTrace();
           return commonServ.invalidMessage("tempeleteError");
        }finally {
            try {
                inputStream.close();
            }catch (IOException e){
                e.printStackTrace();
            }
        }

        return result;
    }

}

最后附上office对应的Content-Type：

.doc     application/msword
.dot     application/msword
.docx    application/vnd.openxmlformats-officedocument.wordprocessingml.document
.dotx    application/vnd.openxmlformats-officedocument.wordprocessingml.template
.docm    application/vnd.ms-word.document.macroEnabled.12
.dotm    application/vnd.ms-word.template.macroEnabled.12
.xls     application/vnd.ms-excel
.xlt     application/vnd.ms-excel
.xla     application/vnd.ms-excel
.xlsx    application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
.xltx    application/vnd.openxmlformats-officedocument.spreadsheetml.template
.xlsm    application/vnd.ms-excel.sheet.macroEnabled.12
.xltm    application/vnd.ms-excel.template.macroEnabled.12
.xlam    application/vnd.ms-excel.addin.macroEnabled.12
.xlsb    application/vnd.ms-excel.sheet.binary.macroEnabled.12
.ppt     application/vnd.ms-powerpoint
.pot     application/vnd.ms-powerpoint
.pps     application/vnd.ms-powerpoint
.ppa     application/vnd.ms-powerpoint
.pptx    application/vnd.openxmlformats-officedocument.presentationml.presentation
.potx    application/vnd.openxmlformats-officedocument.presentationml.template
.ppsx    application/vnd.openxmlformats-officedocument.presentationml.slideshow
.ppam    application/vnd.ms-powerpoint.addin.macroEnabled.12
.pptm    application/vnd.ms-powerpoint.presentation.macroEnabled.12
.potm    application/vnd.ms-powerpoint.presentation.macroEnabled.12
.ppsm    application/vnd.ms-powerpoint.slideshow.macroEnabled.12

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