Java POI 实现Excel相同数据同一颜色，不同数据颜色交替显示

目录

• 1、效果图
• 2、具体代码实现
  • excel 读取工具类
  • excel写入和测试类

1、效果图

2、具体代码实现

excel 读取工具类

package utils;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
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;
/**
 * excel读写工具类 */
public class POIUtil2 {
    private static Logger logger  = Logger.getLogger(POIUtil2.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(File 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++){
                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();
                    //获得当前行的列数
                    int lastCellNum = row.getPhysicalNumberOfCells();
                    String[] cells = new String[row.getPhysicalNumberOfCells()];
                    //循环当前行
                    for(int cellNum = firstCellNum; cellNum < lastCellNum;cellNum++){
                        Cell cell = row.getCell(cellNum);
                        cells[cellNum] = getCellValue(cell);
                    }
                    list.add(cells);
                }
            }
            workbook.close();
        }
        return list;
    }
    public static void checkFile(File 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.getName();
        //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(File file) {
        //获得文件名
        String fileName = file.getName();
        //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 = new FileInputStream(file);
            //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){
        String cellValue = "";
        if(cell == null){
            return cellValue;
        }
        //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());
                break;
            case Cell.CELL_TYPE_STRING: //字符串
                cellValue = String.valueOf(cell.getStringCellValue());
                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;
    }
}

excel写入和测试类

package test;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFCellStyle;
import org.apache.poi.xssf.usermodel.XSSFFont;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.junit.Test;

import pojo.ReadEntity;
import utils.POIUtil2;

public class readTest {

	@Test
	public void test() {
		try {
			// 创建一个Excel对象
			XSSFWorkbook wb = new XSSFWorkbook();
			// 创建表单Sheet对象
			XSSFSheet sheet = wb.createSheet();
			XSSFCellStyle style = null;
			XSSFCellStyle style1 = getCellStyle(wb, HSSFColor.GREEN.index);
			XSSFCellStyle style2 = getCellStyle(wb, HSSFColor.LIGHT_YELLOW.index);
			XSSFCellStyle style3 = getCellStyle(wb, HSSFColor.SKY_BLUE.index);
			XSSFCellStyle style4 = getCellStyle(wb, HSSFColor.LIGHT_ORANGE.index);

			sheet.setColumnWidth(0, 10000); //设置第一列列宽:
			sheet.setColumnWidth(1, 10000); //设置第二列列宽:
			sheet.setColumnWidth(2, 10000); //设置列宽:
			sheet.setColumnWidth(3, 10000); //设置列宽:
			sheet.setColumnWidth(4, 10000); //设置列宽:

			int count = 0;
			int rowNum = 0; //行

			Map<String, List<ReadEntity>> map = getData();
			for (Entry<String, List<ReadEntity>> entry : map.entrySet()) {
				//判断相同数据用同一种背景颜色，四种背景颜色交替显示
				if (count % 4 == 0) {
					style = style1;
				} else if (count % 4 == 1) {
					style = style2;
				} else if (count % 3 == 2) {
					style = style3;
				} else {
					style = style4;
				}
				List<ReadEntity> value = entry.getValue();
				for (ReadEntity temp : value) {
					//创建行
					XSSFRow row = sheet.createRow(rowNum);
//					创建单元格，此处设置了5列
					XSSFCell cell1 = row.createCell(0);
					cell1.setCellValue(temp.getTableName());
					cell1.setCellStyle(style);
					XSSFCell cell2 = row.createCell(1);
					cell2.setCellValue(temp.getTableRemark());
					cell2.setCellStyle(style);
					XSSFCell cell3 = row.createCell(2);
					cell3.setCellValue(temp.getField());
					cell3.setCellStyle(style);
					XSSFCell cell4 = row.createCell(3);
					cell4.setCellValue(temp.getFieldRemark());
					cell4.setCellStyle(style);
					XSSFCell cell5 = row.createCell(4);
					cell5.setCellValue(temp.getFieldType());
					cell5.setCellStyle(style);
					rowNum++;
				}
				count++;
			}
			//写出数据文件
			File file = new File("D:/table2.xlsx");
			if (!file.exists()) {
				file.createNewFile();
			}
			// 输出文件
			FileOutputStream output = new FileOutputStream(file);
			wb.write(output);
			output.flush();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	/**
	 * 获取本地导入数据
	 * @return
	 * @throws IOException
	 */
	private Map<String, List<ReadEntity>> getData() throws IOException {
		File file = new File("D:/table.xlsx");
		List<String[]> list = POIUtil2.readExcel(file);
		Map<String, List<ReadEntity>> map = new LinkedHashMap<>();
		Set<String> set = new HashSet<>();
		List<ReadEntity> entites = null;
		for (String[] strArr : list) {
			if (set.add(strArr[0])) {
				entites = new ArrayList<>();
				map.put(strArr[0], entites);
			}
			ReadEntity entity = new ReadEntity();
			entity.setTableName(strArr[0]);
			entity.setTableRemark(strArr[1]);
			entity.setField(strArr[2]);
			entity.setFieldRemark(strArr[3]);
			entity.setFieldType(strArr[4]);
			entites.add(entity);
		}
		return map;
	}

	/**
	 * 得到不同颜色的style样式
	 * @param wb
	 * @param color
	 * @return
	 */
	public XSSFCellStyle getCellStyle(XSSFWorkbook wb, Short color) {
		XSSFCellStyle style = wb.createCellStyle();
		//注意这两个属性同时设置才能起作用
//		style.setFillForegroundColor(color);// 设置背景色
//		style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
		style.setFillForegroundColor(color);// 设置背景色
		style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);

		style.setBorderBottom(HSSFCellStyle.BORDER_THIN); // 下边框
		style.setBorderLeft(HSSFCellStyle.BORDER_THIN);// 左边框
		style.setBorderTop(HSSFCellStyle.BORDER_THIN);// 上边框
		style.setBorderRight(HSSFCellStyle.BORDER_THIN);// 右边框
//		style.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 居中

		XSSFFont font = wb.createFont();
		font.setFontName("仿宋_GB2312");
//		font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);// 粗体显示
		font.setFontHeightInPoints((short) 12); // 字体大小
		style.setFont(font);// 选择需要用到的字体格式
		return style;
	}

}