EasyPoi来为一个单元格设置属性

 easyPoi本来是挺好用的，和一个java实体类关联，操控实体数组就能写出来一个Excel文件,但在实际用途中我们需要为一些特殊的单元格做一些调整，让人看的舒服一些，也更加突出。

 要达到这种效果。先加上maven

 
	  
		  cn.afterturn
		  easypoi-base
		  4.0.0
	  
	  
		  cn.afterturn
		  easypoi-web
		  4.0.0
	  
	  
		  cn.afterturn
		  easypoi-annotation
		  4.0.0
	  
	

首先是easyPoi的工具类，复制粘贴就好。

package com.demo.utils;

import cn.afterturn.easypoi.excel.ExcelExportUtil;
import cn.afterturn.easypoi.excel.ExcelImportUtil;
import cn.afterturn.easypoi.excel.entity.ExportParams;
import cn.afterturn.easypoi.excel.entity.ImportParams;
import cn.afterturn.easypoi.excel.entity.enmus.ExcelType;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.ss.usermodel.Workbook;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.net.URLEncoder;
import java.util.List;
import java.util.Map;
import java.util.NoSuchElementException;

/**
 * 导入导出公用方法
 */
public class PoiUtils {
    public static void exportExcel(List list, String title, String sheetName, Class pojoClass, String fileName, boolean isCreateHeader, HttpServletResponse response) {
        ExportParams exportParams = new ExportParams(title, sheetName);
        exportParams.setCreateHeadRows(isCreateHeader);
        defaultExport(list, pojoClass, fileName, response, exportParams);

    }

    public static void exportExcel(List list, String title, String sheetName, Class pojoClass, String fileName, HttpServletResponse response) {
        defaultExport(list, pojoClass, fileName, response, new ExportParams(title, sheetName));
    }

    public static void exportExcel(List> list, String fileName, HttpServletResponse response) {
        defaultExport(list, fileName, response);
    }

    private static void defaultExport(List list, Class pojoClass, String fileName, HttpServletResponse response, ExportParams exportParams) {
        Workbook workbook = ExcelExportUtil.exportExcel(exportParams, pojoClass, list);
        if (workbook != null) ;
        downLoadExcel(fileName, response, workbook);
    }

    private static void downLoadExcel(String fileName, HttpServletResponse response, Workbook workbook) {
        try {
            response.setCharacterEncoding("UTF-8");
            response.setHeader("content-Type", "application/vnd.ms-excel");
            response.setHeader("Content-Disposition",
                    "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));
            workbook.write(response.getOutputStream());
        } catch (IOException e) {
            throw new RuntimeException(e.getMessage());
        }
    }

    private static void defaultExport(List> list, String fileName, HttpServletResponse response) {
        Workbook workbook = ExcelExportUtil.exportExcel(list, ExcelType.HSSF);
        if (workbook != null) ;
        downLoadExcel(fileName, response, workbook);
    }

    public static  List importExcel(String filePath, Integer titleRows, Integer headerRows, Class pojoClass) {
        if (StringUtils.isBlank(filePath)) {
            return null;
        }
        ImportParams params = new ImportParams();
        params.setTitleRows(titleRows);
        params.setHeadRows(headerRows);
        List list = null;
        try {
            list = ExcelImportUtil.importExcel(new File(filePath), pojoClass, params);
        } catch (NoSuchElementException e) {
            throw new RuntimeException("模板不能为空");
        } catch (Exception e) {
            e.printStackTrace();
            throw new RuntimeException(e.getMessage());
        }
        return list;
    }

    public static  List importExcel(MultipartFile file, Integer titleRows, Integer headerRows, Class pojoClass) {
        if (file == null) {
            return null;
        }
        ImportParams params = new ImportParams();
        params.setTitleRows(titleRows);
        params.setHeadRows(headerRows);
        List list = null;
        try {
            list = ExcelImportUtil.importExcel(file.getInputStream(), pojoClass, params);
        } catch (NoSuchElementException e) {
            throw new RuntimeException("excel文件不能为空");
        } catch (Exception e) {
            throw new RuntimeException(e.getMessage());
        }
        return list;
    }
}

接下来就是我们的实体类,加上注解就能和Excel相互关联了

@Data
public class ApiDto implements Comparable{
    @Excel(name="ID",orderNum = "0")
    private String id;
    @Excel(name="是否成功出发策略",orderNum = "1")
    private String successs;
    @Excel(name = "请求地址", orderNum = "2",width = 30)
    private String url;
    @Excel(name = "参数", orderNum = "3",width = 30)
    private String param;
    @Excel(name = "名称", orderNum = "4",width = 20)
    private String name;
    @Excel(name = "状态", orderNum = "5")
    private String code;
    @Excel(name = "时间", orderNum = "6")
    private String time;
    @Excel(name = "数据", orderNum = "7",width = 100)
    private String data;
    @Excel(name="策略表数量变化",orderNum = "8",width = 10)
    private String columnChange;
}

测试代码

其实就是获取到Cell,Cell就映射这一个单元格，目前也是初探poi，所以就暴力的使用枚举了，以后再看看能不能优化一下。

package com.test;

import cn.afterturn.easypoi.excel.ExcelExportUtil;
import cn.afterturn.easypoi.excel.entity.ExportParams;
import com.demo.vo.ApiDto;
import com.jfinal.log.Log;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.usermodel.Font;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

/**
 * 通用json获取工具
 */
public class Test {


    private final static Log LOG = Log.getLog(Test.class);
    @org.junit.Test
    public void test(){
        List list = new ArrayList<>();
        ApiDto apiDto1 = new ApiDto("1","2","3","4","5","6","186ms","8","9");
        ApiDto apiDto2 = new ApiDto("1","2","3","4","5","6","822ms","8","9");
        ApiDto apiDto3 = new ApiDto("1","2","asd","4","5","6","456ms","8","9");
        list.add(apiDto1);
        list.add(apiDto2);
        list.add(apiDto3);
        //Workbook就是在内存中的Excel对应的对象
        Workbook wb = ExcelExportUtil.exportExcel(new ExportParams("dnc_test","test"),
         ApiDto.class, list);

        //获取到你这个Excel的长和宽
        Sheet sheet = wb.getSheetAt(0);
        Row row = sheet.getRow(0);
        int rowNum = sheet.getLastRowNum();
        int colNum = row.getPhysicalNumberOfCells();
       
        //创建字体对象，注意这不是awt包下的，是poi给我们封装了一个
        Font font = wb.createFont();
        font.setBold(true);
        short index = HSSFColor.HSSFColorPredefined.RED.getIndex();
        font.setColor(index);
        font.setFontHeightInPoints((short) 12);
        font.setFontName("宋体");

        //效率非常低的二次循环遍历
        for (int i = 1; i <= rowNum; i++) {
            row = sheet.getRow(i);
            int j = 0;
            while (j < colNum) {
                //这里我们就获得了Cell对象，对他进行操作就可以了
                Cell cell = row.getCell((short) j);
                String value = row.getCell((short) j).toString();
                value = value.trim();
                if(value.endsWith("ms")){
                    Integer time = Integer.parseInt(value.substring(0,value.length()-2));
                    HSSFCellStyle style = (HSSFCellStyle) wb.createCellStyle();
                    style.setAlignment(HorizontalAlignment.CENTER);
                    style.setFont(font);
                    cell.setCellStyle(style);
                }
                j++;
            }
        }

        //把内存中的Excel写到磁盘中去
        File file = new File("E:/test.xls");
        if(file.exists()){
            file.delete();
        }
        try {
            file.createNewFile();
            FileOutputStream fileOutputStream = new FileOutputStream(file);
            wb.write(fileOutputStream);
            LOG.info("xls文件写入成功，地址:"+file.getAbsolutePath());
            wb.close();
        } catch (IOException e) {
            LOG.info("xls文件写入失败，地址:"+file.getAbsolutePath());
            e.printStackTrace();
        }
    }

}

然后就可以得到一开始的效果了。当然如果你有优化的办法还希望不吝指教，让我们一同进步。