上传excel，修改数据库信息状态(foreach单个修改)(一)

@TOC

先决条件

本人导入的Excel文件为这样，具体格式可按需求改变

所涉及的数据库

商品表

g_id	name	image_url	state
10000	中信银行信用卡	…/zhongxin.jpg	1
10001	广发银行信用卡	…/guangfa.jpg	1

客户表

c_id	created_time	check_time	c_name	c_tel	parent_id	state	close	g_id	del
1201	2019-03-03		张三丰	13188888888	738	0	0	10001	0

员工表（省略）

代码内容 ，完整实现过程

1.Maven 配置

<dependency>
			<groupId>commons-fileupload</groupId>
			<artifactId>commons-fileupload</artifactId>
			<version>1.2.1</version>
		</dependency>

控制层 controller

    /*
	 * 批量添加银行数据导入
	 */
	@ResponseBody
	@RequestMapping(value = "BankDataUpload.do", produces = "application/text; charset=utf-8")
	public String BankDataUpload(HttpServletRequest request, HttpServletResponse response) {
		String str = null;
		try {
		   //调用service 里BankDataUpload(request, response) 方法
			str = sysUploadServiceimpl.BankDataUpload(request, response);
		} catch (Exception e) {
			e.printStackTrace();
		}
		return str;
	}

实现类 里对应的BankDataUpload(request, response);方法

/*
	 * 导入银行回馈的数据，并修改客户的状态 client status=1
	 */
	@Override
	public String BankDataUpload(HttpServletRequest request, HttpServletResponse response) throws Exception {	
		MultipartResolver resolver = new CommonsMultipartResolver(request.getSession().getServletContext());
		MultipartHttpServletRequest multipartRequest = resolver.resolveMultipart(request);
		MultipartFile file = multipartRequest.getFile("upfile");
		if (file.isEmpty()) {
			try {
				throw new Exception("文件不存在！");
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
		InputStream in = null;
		try {
			in = file.getInputStream();
		} catch (IOException e) {
			e.printStackTrace();
		}
		List<List<Object>> listob = null;
		try {
			listob = new ExcelUtil().getBankListByExcel(in, file.getOriginalFilename());
		} catch (Exception e) {
			e.printStackTrace();
		}
		System.out.println("将商品名字，id查出，保存在map中，避免以后重复查询");
		Map<String, Integer> mapofgid = new HashMap<String, Integer>();
		 try {
			 List<Goodsmanage> list=dao.getGoodsName();
			 for (Goodsmanage goodsmanage : list) {
				Integer  gId=goodsmanage.getgId();
				String name=goodsmanage.getName();
				mapofgid.put(name, gId);
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		String data = null;
		// 该处可调用service相应方法进行数据保存到数据库中，现只对数据进行修改
		for (int i = 0; i < listob.size(); i++) {
			List<Object> lo = listob.get(i);
			Client vo = new Client();
			//获取Excel表格里的第一列数据
			String createdTime = String.valueOf(lo.get(0));
			createdTime = createdTime.substring(0, 10);
			vo.setCreatedTime(createdTime);
			String checkTime = String.valueOf(lo.get(1));
			checkTime = checkTime.substring(0, 10);
			vo.setCheckTime(checkTime);
			String cName = (String.valueOf(lo.get(2)));
			cName = cName.substring(0, cName.length() - 2);
			cName = cName + '%';
			vo.setcName(cName);	
			String cTel = (String.valueOf(lo.get(3)));
			cTel = cTel.replace("****", "%");
			vo.setcTel(cTel);
			String gname=(String) lo.get(4);
			Integer gId= mapofgid.get(gname);     //与mapofgid里的key比对，获取对应的value值
			vo.setgId(gId);
			
			System.out.println(vo.toString());
			try {
				boolean Result = dao.UpdateBankDatas(vo);
				if (!Result) {
					System.out.println("___________________________修改失败____________________");
				}
			} catch (Exception e) {
				System.out.println("修改异常");
				e.printStackTrace();
			}
		}
		data = "文件导入成功！";
		return data;
	}

这里参考了一篇博客 https://blog.csdn.net/Marvel__Dead/article/details/71746976 讲的是一些非常原理的内容

sql语句

<update id="UpdateBankDatas" parameterType="cn.CBHApp.entity.Client">
		UPDATE client SET
		check_time=#{checkTime} ,state=1 WHERE  g_id=#{gId} and  created_time=#{createdTime} and
		c_name like #{cName} and c_tel LIKE #{cTel} 
	</update>

工具类 ExcelUtil

这里借鉴了一篇博客 https://blog.csdn.net/qq_37880968/article/details/83038412

import java.io.IOException;  
import java.io.InputStream;  
import java.math.BigDecimal;
 
import java.text.SimpleDateFormat;  
import java.util.ArrayList;  
import java.util.Date;
import java.util.List;  
  
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
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;  
  
  
public class ExcelUtil {  
      
    private final static String excel2003L =".xls";    //2003- 版本的excel  
    private final static String excel2007U =".xlsx";   //2007+ 版本的excel  
      
    /** 
     * 描述：获取IO流中的数据，组装成List<List<Object>>对象 
     * @param in,fileName 
     * @return 
     * @throws IOException  
     */  
    public  List<List<Object>> getBankListByExcel(InputStream in,String fileName) throws Exception{  
        List<List<Object>> list = null;  
          
        //创建Excel工作薄  
        Workbook work = this.getWorkbook(in,fileName);  
        if(null == work){  
            throw new Exception("创建Excel工作薄为空！");  
        }  
        Sheet sheet = null;  //页数
        Row row = null;  //行数
        Cell cell = null;  //列数
        
        list = new ArrayList<List<Object>>();  
        //遍历Excel中所有的sheet  
        // 将最大的列数记录下来
        int lastCellNum = 0;
        for (int i = 0; i < work.getNumberOfSheets(); i++) {  
            sheet = work.getSheetAt(i);  
            if(sheet==null){continue;}  
              
            //遍历当前sheet中的所有行  
            for (int j = sheet.getFirstRowNum(); j <= sheet.getLastRowNum(); j++) {  
                row = sheet.getRow(j);  
                if(row==null||row.getFirstCellNum()==j){continue;}  
                  
                //遍历所有的列  
                List<Object> li = new ArrayList<Object>(); 
                // 比较当前行的列数跟表的最大的列数
                if (j == sheet.getFirstRowNum()) {
                	// 将第一行的列数设为最大
                	lastCellNum = row.getLastCellNum();
				}else {
					lastCellNum = lastCellNum > row.getLastCellNum() ? lastCellNum : row.getLastCellNum(); 
				}
                for (int y = row.getFirstCellNum(); y < lastCellNum; y++) {  
                    cell = row.getCell(y);  
                    li.add(this.getValue(cell));  
                } 
                list.add(li);  
            }  
        }  
 
        return list;  
        
    }  
      
    /** 
     * 描述：根据文件后缀，自适应上传文件的版本  
     * @param inStr,fileName 
     * @return 
     * @throws Exception 
     */  
    public  Workbook getWorkbook(InputStream inStr,String fileName) throws Exception{  
        Workbook wb = null;  
        String fileType = fileName.substring(fileName.lastIndexOf("."));  
        if(excel2003L.equals(fileType)){  
            wb = new HSSFWorkbook(inStr);  //2003-  
        }else if(excel2007U.equals(fileType)){  
            wb = new XSSFWorkbook(inStr);  //2007+  
        }else{  
            throw new Exception("解析的文件格式有误！");  
        }  
        return wb;  
    }  
  
    /** 
     * 描述：对表格中数值进行格式化 
     * @param cell 
     * @return 
     */  
  //解决excel类型问题，获得数值  
    public  String getValue(Cell cell) {  
        String value = "";  
        if(null==cell){  
            return value;  
        }  
        switch (cell.getCellType()) {  
        //数值型  
        case Cell.CELL_TYPE_NUMERIC:  
            if (HSSFDateUtil.isCellDateFormatted(cell)) {  
                //如果是date类型则 ，获取该cell的date值  
                Date date = HSSFDateUtil.getJavaDate(cell.getNumericCellValue()); 
				// 根据自己的实际情况，excel表中的时间格式是yyyy-MM-dd HH:mm:ss还是yyyy-MM-dd，或者其他类型
                SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
                // 由于方法的返回值类型为String，这里将Date类型转为String，便于统一返回数据 
                value = format.format(date);;  
            }else {// 纯数字  
                BigDecimal big=new BigDecimal(cell.getNumericCellValue());  
                value = big.toString();  
                //解决1234.0  去掉后面的.0  
                if(null!=value&&!"".equals(value.trim())){  
                     String[] item = value.split("[.]");  
                     if(1<item.length&&"0".equals(item[1])){  
                         value=item[0];  
                     }  
                }  
            }  
            break;  
            //字符串类型   
        case Cell.CELL_TYPE_STRING:  
            value = cell.getStringCellValue().toString();  
            break;  
        // 公式类型  
        case Cell.CELL_TYPE_FORMULA:  
            //读公式计算值  
            value = String.valueOf(cell.getNumericCellValue());  
            if (value.equals("NaN")) {// 如果获取的数据值为非法值,则转换为获取字符串  
                value = cell.getStringCellValue().toString();  
            }  
            break;  
        // 布尔类型  
        case Cell.CELL_TYPE_BOOLEAN:  
            value = " "+ cell.getBooleanCellValue();  
            break;   
        default:  
            value = cell.getStringCellValue().toString();  
    }  
    if("null".endsWith(value.trim())){  
        value="";  
    }  
  return value;  
    }  
}