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java easyPOI实现导出一对多数据

2023-12-06 08:49:36 作者：Xiao5xiao122

这篇文章主要为大家详细介绍了java如何利用easyPOI实现导出一对多数据,并且可以设置边框、字体和字体大小,感兴趣的小伙伴可以跟随小编一起学习一下

java easyPOI导出一对多数据，设置边框，字体，字体大小

需求总是千奇百怪，解决的方式也可以是多种多样。

今天碰到导出excel是一对多结构的，以往导出的数据都是一条一条的，所以采用的是比较方便简单的方法easyExcel，今天猛然碰到一对多导出虽然用easyExcel也可以，但是相对比较麻烦，没有easyPOI快捷，之前有自己写过导出excel一个表格一个表格画，但是太麻烦。今天正好需求不急，就慢慢研究用easypoi导出，写出通用方法，以后遇到类似的就好办多了，直接调方法。废话不多说，先上效果图：

首先是实体中设置：

public class YjwzStockInVO extends TYjwzStockIn implements Serializable {
	//注意：needMerge = true 必加，不然合并的单元格，边框不会合并，需要导出的实体加@Excel注解，不需要导出的字段加@ExcelIgnore注解排除
    @Excel(needMerge = true,name = "状态名称")
    @ApiModelProperty(value = "状态名称")
    private String ztmc;

    @Excel(needMerge = true,name = "一级品类")
    @ApiModelProperty(value = "一级物资名称")
    private String wzOnemc;

    @Excel(needMerge = true,name = "二级品类")
    @ApiModelProperty(value = "二级物资名称")
    private String wzTwomc;

    @Excel(needMerge = true,name = "三级品类")
    @ApiModelProperty(value = "三级物资名称")
    private String wzThreemc;

    @Excel(needMerge = true,name = "四级品类")
    @ApiModelProperty(value = "四级物资名称")
    private String wzRourmc;

    @Excel(needMerge = true,name = "数据来源")
    @ApiModelProperty(value = "数据来源：1：市应急平台，2：人工新增")
    @DataBindDict(sourceField = "#sjly", sourceFieldCombination = "sjly")
    private String sjlymc;

    @ExcelCollection(name = "应急物资明细")
    @ApiModelProperty(value = "应急物资详情")
    private List<YjwzStockInDtlVO> dtlList;
}

子类：

public class YjwzStockInDtlVO extends TYjwzStockInDtl implements Serializable {

    @Excel(name = "单据类型")
    @ApiModelProperty(value = "单据类型：1：采购入库，2：调拨入库")
    @DataBindDict(sourceField = "#djlx", sourceFieldCombination = "lx")
    private String djlxmc;

    @Excel(name = "入库质检")
    @ApiModelProperty(value = "入库质检：1：已检验入库，2：未检验入库")
    @DataBindDict(sourceField = "#rkzj", sourceFieldCombination = "zjlx")
    private String rkzjmc;

    @Excel(name = "质检结果")
    @ApiModelProperty(value = "质检结果：1：合格，2：不合格")
    @DataBindDict(sourceField = "#zjjg", sourceFieldCombination = "zjjg")
    private String zjjgmc;

    @Excel(name = "存储期单位")
    @ApiModelProperty(value = "存储期单位：1：年，2：月")
    @DataBindDict(sourceField = "#ccqdw", sourceFieldCombination = "ccqdw")
    private String ccqdwmc;
}

然后是工具类准备：

1）首先是设置字体样式的工具类：

package com.sydata.zt.common.excel;
import cn.afterturn.easypoi.excel.entity.params.ExcelExportEntity;
import cn.afterturn.easypoi.excel.entity.params.ExcelForEachParams;
import cn.afterturn.easypoi.excel.export.styler.IExcelExportStyler;
import org.apache.poi.ss.usermodel.*;
/**
 * @Author xx
 * @Date 2023/12/5 17:37
 * @Description: poi导出excel样式设置工具
 * @Version 1.0
 */
public class ExcelStyleUtil implements IExcelExportStyler {
    private static final short STRING_FORMAT = (short) BuiltinFormats.getBuiltinFormat("TEXT");
    private static final short FONT_SIZE_TEN = 9;
    private static final short FONT_SIZE_ELEVEN = 10;
    private static final short FONT_SIZE_TWELVE = 10;
    /**
     * 大标题样式
     */
    private CellStyle headerStyle;
    /**
     * 每列标题样式
     */
    private CellStyle titleStyle;
    /**
     * 数据行样式
     */
    private CellStyle styles;
    public ExcelStyleUtil(Workbook workbook){
        this.init(workbook);
    }
    /**
     * 初始化样式
     * @param workbook
     */
    private void init(Workbook workbook) {
        this.headerStyle = initHeaderStyle(workbook);
        this.titleStyle = initTitleStyle(workbook);
        this.styles = initStyles(workbook);
    }
    /**
     * 初始化大标题样式
     *
     * @param workbook
     * @return
     */
    private CellStyle initHeaderStyle(Workbook workbook) {
        CellStyle style = getBaseCellStyle(workbook);
        style.setFont(getFont(workbook,FONT_SIZE_ELEVEN,Boolean.TRUE));
        return style;
    }
    /**
     * 初始化小标题样式
     * @param workbook
     * @return
     */
    private CellStyle initTitleStyle(Workbook workbook) {
        CellStyle style = getBaseCellStyle(workbook);
        style.setFont(getFont(workbook,FONT_SIZE_ELEVEN,Boolean.TRUE));
        return style;
    }
    /**
     * 数据行样式
     * @param workbook
     * @return
     */
    private CellStyle initStyles(Workbook workbook) {
        CellStyle style = getBaseCellStyle(workbook);
        style.setDataFormat(STRING_FORMAT);
        return style;
    }
    /**
     * 大标题样式
     * @param color
     * @return
     */
    @Override
    public CellStyle getHeaderStyle(short color) {
        return headerStyle;
    }
    /**
     * 每列标题样式
     * @param color
     * @return
     */
    @Override
    public CellStyle getTitleStyle(short color) {
        return titleStyle;
    }
    /**
     * 数据行样式
     * @param b
     * @param excelExportEntity
     * @return
     */
    @Override
    public CellStyle getStyles(boolean b, ExcelExportEntity excelExportEntity) {
        return styles;
    }
    /**
     * 获取行样式方法
     * @param cell
     * @param i
     * @param entity
     * @param o
     * @param o1
     * @return
     */
    @Override
    public CellStyle getStyles(Cell cell, int i, ExcelExportEntity entity, Object o, Object o1) {
        return getStyles(true,entity);
    }
    @Override
    public CellStyle getTemplateStyles(boolean b, ExcelForEachParams excelForEachParams) {
        return null;
    }
    /**
     * 基础样式
     * @param workbook
     * @return
     */
    private CellStyle getBaseCellStyle(Workbook workbook) {
        CellStyle style = workbook.createCellStyle();
        //下边框
        style.setBorderBottom(BorderStyle.THIN);
        //左边框
        style.setBorderLeft(BorderStyle.THIN);
        //右边框
        style.setBorderRight(BorderStyle.THIN);
        //上边框
        style.setBorderTop(BorderStyle.THIN);
        //水平居中
        style.setAlignment(HorizontalAlignment.CENTER);
        //上下居中
        style.setVerticalAlignment(VerticalAlignment.CENTER);
        //设置自动换行
        style.setWrapText(Boolean.TRUE);
        return style;
    }
    /**
     * 字体样式
     * @param workbook
     * @param size
     * @param isBold
     * @return
     */
    private Font getFont(Workbook workbook,short size,boolean isBold){
        Font font = workbook.createFont();
        //字体大小
        font.setFontHeightInPoints(size);
        //字体是否加粗
        font.setBold(isBold);
        //设置字体
//        font.setFontName("");
        return font;
    }
}

2）然后导出excel工具类

package com.sydata.zt.common.excel;
import cn.afterturn.easypoi.excel.ExcelExportUtil;
import cn.afterturn.easypoi.excel.entity.ExportParams;
import cn.afterturn.easypoi.excel.entity.enmus.ExcelType;
import com.alibaba.excel.util.ListUtils;
import com.alibaba.excel.write.metadata.style.WriteCellStyle;
import com.alibaba.excel.write.metadata.style.WriteFont;
import com.alibaba.excel.write.style.HorizontalCellStyleStrategy;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.ss.formula.functions.T;
import org.apache.poi.ss.usermodel.BorderStyle;
import org.apache.poi.ss.usermodel.HorizontalAlignment;
import org.apache.poi.ss.usermodel.VerticalAlignment;
import org.apache.poi.ss.usermodel.Workbook;
import org.springframework.util.CollectionUtils;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.lang.reflect.Method;
import java.net.URLEncoder;
import java.util.*;
/**
 * @author hm
 * @date 2023/3/14 17:33
 */
public class EasyExcelGeneralUtil {
    /**
     * 设置response编码
     */
    public static void setResponseContentType(HttpServletResponse response, String fileName) throws UnsupportedEncodingException {
        response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
        response.setCharacterEncoding("utf-8");
        response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "utf-8") + ".xlsx");
        response.setHeader("Access-Control-Expose-Headers", "Content-Disposition");
    }
    public static void exportExcelByEasyPoi(HttpServletResponse response, String fileName, List<Object> vos, Class<?> classType) throws IOException {
        ExportParams exportParams = new ExportParams();
        // 设置sheet得名称
        exportParams.setSheetName(fileName);
        //设置边框，字体，字体大小
        exportParams.setStyle(ExcelStyleUtil.class);
        Map<String, Object> map = new HashMap<>();
        // title的参数为ExportParams类型，目前仅仅在ExportParams中设置了sheetName
        map.put("title", exportParams);
        // 模版导出对应得实体类型的class文件
        map.put("entity", classType);
        // sheet中要填充得数据
        map.put("data", vos);
        List<Map<String, Object>> sheetsList = new ArrayList<>();
        sheetsList.add(map);
        //创建excel文件的方法
        Workbook workbook = ExcelExportUtil.exportExcel(sheetsList, ExcelType.HSSF);
        //通过response输出流直接输入给客户端
        ServletOutputStream outputStream = response.getOutputStream();
        workbook.write(outputStream);
        outputStream.flush();
        outputStream.close();
    }
}

准备工作已完成，接下来就可以愉快的导出了：

@SneakyThrows
    @PostMapping("/export")
    @ApiOperation(value = "导出")
    public void export(HttpServletRequest request, HttpServletResponse response,@RequestBody YjwzStockInDTO yjwzStockInDTO){
        request.getSession();
        String fileName = "文件名称";
        EasyExcelGeneralUtil.setResponseContentType(response,fileName);
		//设置的分页最多能导出10000条数据
        yjwzStockInDTO.setPageNum(1);
        yjwzStockInDTO.setPageSize(10000);
		//查库得到需要导出的数据
        List<Object> vos = (List<Object>) stockInService.page(yjwzStockInDTO).getRows();
        EasyExcelGeneralUtil.exportExcelByEasyPoi(response,fileName,vos,YjwzStockInVO.class);
    }

好了，完整的过程就是这样了，直接掉接口导出就可以了。

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java easyPOI实现导出一对多数据

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