easyExcell

easyexcell准备工作

用到的实体类

@Data
@AllArgsConstructor
@NoArgsConstructor
public class Teacher {private String name;private int age;private int weight;private String address;
}

导入相关依赖，此处只给easyexcell的依赖

 <!-- easyexcel依赖 --><dependency><groupId>com.alibaba</groupId><artifactId>easyexcel</artifactId><version>3.0.5</version></dependency>

导出测试

    @Testvoid test11() {Teacher t1 = new Teacher("1", 11, 22, "zz");Teacher t2 = new Teacher("2", 22, 33, "aa");Teacher t3 = new Teacher("3", 33, 25, "vv");Teacher t4 = new Teacher("4", 28, 11, "aa");Teacher t5 = new Teacher("1", 22, 11, "zz");Teacher t6 = new Teacher("1", 22, 11, "zz");//拿到的数据（真实情况是从db拿数据）ArrayList<Teacher> teachers = Lists.newArrayList(t1, t2, t3, t4, t5, t6);//1.xlsx为导出文件名字，应封装传参进行设置EasyExcel.write("D://1.xlsx")//excell表头，即实体类的属性名，在实体类注解定义的.head(Teacher.class)//导出格式，xlsx为07版excell文件后缀.excelType(ExcelTypeEnum.XLSX)//设置excell第一页sheet名称.sheet("老师信息")//设置标题，合并头行单元格，此处没用到
//              .registerWriteHandler(自定义处理器)//设置写信息从第几行开始
//              .relativeHeadRowIndex(2)//自定义表格策略.registerWriteHandler(createTableStyle())//设置列宽.registerWriteHandler(new SimpleColumnWidthStyleStrategy(20))//设置表头行高，内容行高.registerWriteHandler(new SimpleRowHeightStyleStrategy((short)20,(short)20))//导出数据源.doWrite(teachers);}/*** 自定义表格策略*/public static WriteHandler createTableStyle() {// 头的策略*************************************WriteCellStyle headWriteCellStyle = new WriteCellStyle();// 背景headWriteCellStyle.setFillForegroundColor(IndexedColors.WHITE.getIndex());// 表头边框:底边框,右边框,左边框,顶边框headWriteCellStyle.setBorderBottom(BorderStyle.THIN);headWriteCellStyle.setBorderRight(BorderStyle.THIN);headWriteCellStyle.setBorderLeft(BorderStyle.THIN);headWriteCellStyle.setBorderTop(BorderStyle.THIN);// 表头边框颜色:底边框颜色,右边框颜色,左边框颜色,顶边框颜色headWriteCellStyle.setBottomBorderColor(IndexedColors.LIGHT_CORNFLOWER_BLUE.index);headWriteCellStyle.setRightBorderColor(IndexedColors.LIGHT_CORNFLOWER_BLUE.index);headWriteCellStyle.setLeftBorderColor(IndexedColors.LIGHT_CORNFLOWER_BLUE.index);headWriteCellStyle.setTopBorderColor(IndexedColors.LIGHT_CORNFLOWER_BLUE.index);// 字体策略*************************************WriteFont headWriteFont = new WriteFont();// 表头字体大小headWriteFont.setFontHeightInPoints((short) 10);// 字体样式headWriteFont.setFontName("等线");// 默认关闭字体加粗 falseheadWriteFont.setBold(false);headWriteCellStyle.setWriteFont(headWriteFont);// 内容的策略WriteCellStyle contentWriteCellStyle = new WriteCellStyle();// 这里需要指定 FillPatternType 为FillPatternType.SOLID_FOREGROUND 不然无法显示背景颜色.头默认了 FillPatternType所以可以不指定contentWriteCellStyle.setFillPatternType(FillPatternType.SOLID_FOREGROUND);// 背景颜色contentWriteCellStyle.setFillForegroundColor(IndexedColors.WHITE.index);// 内容策略*************************************WriteFont contentWriteFont = new WriteFont();// 内容 字体大小contentWriteFont.setFontHeightInPoints((short) 10);// 内容 字体样式contentWriteFont.setFontName("等线");// 内容 默认关闭字体加粗 falsecontentWriteFont.setBold(false);contentWriteCellStyle.setWriteFont(contentWriteFont);// 内容 水平对齐居中contentWriteCellStyle.setHorizontalAlignment(HorizontalAlignment.LEFT);// 内容 垂直对齐居中contentWriteCellStyle.setVerticalAlignment(VerticalAlignment.CENTER);// 边框样式*************************************// 底边框,右边框,左边框,顶边框contentWriteCellStyle.setBorderBottom(BorderStyle.THIN);contentWriteCellStyle.setBorderRight(BorderStyle.THIN);contentWriteCellStyle.setBorderLeft(BorderStyle.THIN);contentWriteCellStyle.setBorderTop(BorderStyle.THIN);// 底边框颜色,右边框颜色,左边框颜色,顶边框颜色contentWriteCellStyle.setBottomBorderColor(IndexedColors.LIGHT_CORNFLOWER_BLUE.index);contentWriteCellStyle.setRightBorderColor(IndexedColors.LIGHT_CORNFLOWER_BLUE.index);contentWriteCellStyle.setLeftBorderColor(IndexedColors.LIGHT_CORNFLOWER_BLUE.index);contentWriteCellStyle.setTopBorderColor(IndexedColors.LIGHT_CORNFLOWER_BLUE.index);// 自动换行 默认关闭 falsecontentWriteCellStyle.setWrapped(false);// 文本收缩至合适 默认关闭 falsecontentWriteCellStyle.setShrinkToFit(false);// 这个策略是 头是头的样式 内容是内容的样式 其他的策略可以自己实现HorizontalCellStyleStrategy horizontalCellStyleStrategy =new HorizontalCellStyleStrategy(headWriteCellStyle, contentWriteCellStyle);return horizontalCellStyleStrategy;}

导入测试

@Service
public class TeacherImport {public static void test() throws FileNotFoundException {//每一条数据的载体Teacher teacher = new Teacher();//拿到文件File file = new File("D://1.xlsx");//获取文件输入流FileInputStream fo = new FileInputStream(file);//读取文件ExcelReader build = EasyExcelFactory.read(fo)//按照实体类去读.head(Teacher.class)//导入需要自定义监听器.registerReadListener(new EasyExcelReadUtils.TeacherListener(teacher)).build();//读取第一个sheetReadSheet readSheet = EasyExcelFactory.readSheet(0).build();build.read(readSheet);}public void insertMatnrGroup(List<Teacher> teacherList, Teacher teacher, Set<String> matnrSet, Map<String, String> errorFieldNameMap) {//业务处理,一般就是存到数据库，这里就直接打印了teacherList.stream().forEach(item->{System.out.println(item.toString());});}
}

其中用到的自定义监听器

package com.example.utils;import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.metadata.data.ReadCellData;
import com.alibaba.excel.read.listener.ReadListener;
import com.alibaba.excel.util.ListUtils;
import com.example.entity.Teacher;
import com.example.examples.TeacherImport;
import com.google.common.collect.Sets;import javax.annotation.Resource;
import java.util.*;public class EasyExcelReadUtils {/*** 组合零件维护监听器 matnrGroup*/public static class TeacherListener implements ReadListener<Teacher> {@Resourceprivate TeacherImport excelBll = SpringUtil.getBean(TeacherImport.class);/*** 每隔5条存储数据库，实际使用中可以100条，然后清理list ，方便内存回收*/private static final int BATCH_COUNT = 100;/*** 缓存的数据*/private List<Teacher> teacherList = ListUtils.newArrayListWithExpectedSize(BATCH_COUNT);//全局set(业务需要，可不写)private Set<String> matnrSet = Sets.newHashSet();//存储异常信息（同上）Map<String, String> errorFieldNameMap = new HashMap<>(16);/****/private Teacher teacher;/*** 如果使用了spring,请使用这个构造方法。每次创建Listener的时候需要把spring管理的类传进来** @param*/public TeacherListener(Teacher teacher) {this.teacher = teacher;}@Overridepublic void invokeHead(Map<Integer, ReadCellData<?>> headMap, AnalysisContext context) {
//            List<String> list=new ArrayList<>();
//            list.add(SysConstants.MATNR_FIELD);
//            templateValid(headMap,list);}/*** 这个每一条数据解析都会来调用** @param teacher    one row value. Is is same as {@link AnalysisContext#readRowHolder()}* @param context*/@Overridepublic void invoke(Teacher teacher, AnalysisContext context) {teacherList.add(teacher);// 达到BATCH_COUNT了，需要去存储一次数据库，防止数据几万条数据在内存，容易OOMif (teacherList.size() >= BATCH_COUNT) {saveData();// 存储完成清理 listteacherList = ListUtils.newArrayListWithExpectedSize(BATCH_COUNT);}}/*** 所有数据解析完成了 都会来调用** @param context*/@Overridepublic void doAfterAllAnalysed(AnalysisContext context) {// 这里也要保存数据，确保最后遗留的数据也存储到数据库saveData();}/*** 加上存储数据库*/private void saveData() {excelBll.insertMatnrGroup(teacherList,teacher,matnrSet,errorFieldNameMap);}}
}

监听器中用到的SpringUtil类

package com.example.utils;import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;@Component
class SpringUtil implements ApplicationContextAware {private static ApplicationContext applicationContext;@Overridepublic void setApplicationContext(ApplicationContext applicationContext) throws BeansException {SpringUtil.applicationContext = applicationContext;}/*** 通过class获取Bean** @param clazz class* @param <T>   泛型* @return bean*/public static <T> T getBean(Class<T> clazz) {return applicationContext.getBean(clazz);}
}

测试一下

 @Testvoid test13(){try {TeacherImport.test();} catch (FileNotFoundException e) {e.printStackTrace();}//打印结果//Teacher(name=1, age=11, weight=22, address=zz)//Teacher(name=2, age=22, weight=33, address=aa)//Teacher(name=3, age=33, weight=25, address=vv)//Teacher(name=4, age=28, weight=11, address=aa)//Teacher(name=1, age=22, weight=11, address=zz)//Teacher(name=1, age=22, weight=11, address=zz)}

其中要注意的是每次insert业务处理拿到的list不是全部数据，是定义的batch条数据，类似分页

多sheet导出

用到的实体类

import com.alibaba.excel.annotation.ExcelIgnore;
import com.alibaba.excel.annotation.ExcelProperty;
import com.alibaba.excel.annotation.write.style.ColumnWidth;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;@Data
@AllArgsConstructor
@NoArgsConstructor
public class Teacher {//    @ExcelIgnore  此注释为导出时忽略本字段
//    @ColumnWidth(value = 40) 此注释可单独设置本字段单元格的宽度,高度也类似，自行百度@ExcelProperty(value = "姓名")private String name;@ExcelProperty(value = "年龄")private int age;@ExcelProperty(value = "体重")private int weight;@ExcelProperty(value = "地址")private String address;
}

import com.alibaba.excel.annotation.ExcelProperty;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;@Data
@AllArgsConstructor
@NoArgsConstructor
public class Student {@ExcelProperty(value = "姓名")private String name;@ExcelProperty(value = "年龄")private int age;@ExcelProperty(value = "成绩")private int score;@ExcelProperty(value = "班级")private String classNumber;
}

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;import java.util.List;@Data
@NoArgsConstructor
@AllArgsConstructor
public class AllData {private List<Teacher> teacherList;private List<Student> studentsList;
}

导出测试（其中自定义策略在上面单sheet导出里）

@Testvoid test14(){//获得数据,真实环境应该从数据库读//创建一个AllData，其中两个属性分别是老师list和学生listAllData allData = new AllData();//捏造几条老师数据Teacher t1 = new Teacher("1", 11, 22, "zz");Teacher t2 = new Teacher("2", 22, 33, "aa");Teacher t3 = new Teacher("3", 33, 25, "vv");Teacher t4 = new Teacher("4", 28, 11, "aa");Teacher t5 = new Teacher("1", 22, 11, "zz");Teacher t6 = new Teacher("1", 22, 11, "zz");ArrayList<Teacher> teachers = Lists.newArrayList(t1, t2, t3, t4, t5, t6);//捏造几条学生数据Student s1 = new Student("11",11,342,"一班");Student s2 = new Student("22",22,314,"二班");Student s3 = new Student("33",33,421,"三班");Student s4 = new Student("44",44,521,"四班");Student s5 = new Student("55",55,123,"五班");Student s6 = new Student("66",66,234,"六班");ArrayList<Student> students = Lists.newArrayList(s1, s2, s3, s4, s5, s6);//放进alldata里面allData.setTeacherList(teachers);allData.setStudentsList(students);//1.xlsx为导出文件名字，应封装传参进行设置ExcelWriter excelWriter = EasyExcel.write("D://2.xlsx")//导出格式，xlsx为07版excell文件后缀.excelType(ExcelTypeEnum.XLSX)//设置写信息从第几行开始.relativeHeadRowIndex(1)//自定义表格策略.registerWriteHandler(createTableStyle())//设置列宽.registerWriteHandler(new SimpleColumnWidthStyleStrategy(20))//设置表头行高，内容行高.registerWriteHandler(new SimpleRowHeightStyleStrategy((short) 20, (short) 20)).build();excelWriter.write(allData.getTeacherList(), EasyExcel.writerSheet(0,"老师信息").head(Teacher.class).build()).write(allData.getStudentsList(), EasyExcel.writerSheet(1,"学生信息").head(Student.class).build());excelWriter.finish();}

效果

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easyExcell

easyexcell准备工作

导出测试

多sheet导出

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