java导出excel通用工具(POI,类注解形式)-编程知识

通过给类定义注解(设置名称，设置kv转换值)，然后利用设置的名称和传入的数据进行导出。

只需要在项目添加两个工具类就可以实现excel导出功能。

1、单sheet

步骤：1、根据业务需求定义导出的类，并设置表头名称。
2、调用工具类

定义类：

@Data
public class ScDetailsReviewExcelVo {//年份@ExcelIO(value = "年份")private String examineYear;/**考核批次*/@ExcelIO(value = "考核批次")private String batchName;//姓名@ExcelIO(value = "姓名")private String realname;//科室@ExcelIO(value = "科室")private String departName;/**考核总分*/@ExcelIO(value = "考核总分")private String examineScore;/**个人能力得分*/@ExcelIO(value = "个人能力得分")private String personnelScore;/**工作业绩得分*/@ExcelIO(value = "工作业绩得分")private String postScore;/**额外工作得分*/@ExcelIO(value = "额外工作得分")private String otherScore;/**状态*/@ExcelIO(value = "状态",kv="0-未提交;1-已完成;2-已退回;3-已归档")private Integer userState;
}

调用方式：

    @Overridepublic void exprotExcel(HttpServletResponse response, ScDetailsReview scDetailsReview) {//获取数据List<ScDetailsReviewExcelVo> list=scDetailsReviewMapper.selectForExcel(scDetailsReview);//调用工具ExcelUtil<ScDetailsReviewExcelVo> excelVoExcelUtil=new ExcelUtil<>(ScDetailsReviewExcelVo.class);//导出数据excelVoExcelUtil.getExcel(list,response,"打分");}

2、多sheet

        步骤：1、定义大类作为参数对象。
                   2、在大类中设置List子类，且各List对应各sheet页数据，设置List泛型中的属性为其注
                        解表头名称（下列例子中只展示了一个大类和其中的一个子类）
                   3、使用工具类进行调用。

定义的类：

@Data
public class ScPerformanceForChildExcelVo {//个人能力private List<ScPersonalDetailedExcelVo> scPersonalDetailedExcelVoList=new ArrayList<>();//工作业绩private List<ScPostDetailedExcelVo> scPostDetailedExcelVoList=new ArrayList<>();//额外private List<ScOtherDetailedExcelVo> scOtherDetailedExcelVoList=new ArrayList<>();}

@Data
public class ScPersonalDetailedExcelVo {/**类别*/@ExcelIO(value = "类别")private String category;/**考评指标*/@ExcelIO(value = "考评指标")private String assessmentIndex;/**考评要点*/@ExcelIO(value = "考评要点")private String keyPoint;/**评分参考细则*/@ExcelIO(value = "评分参考细则")private String detailedRules;/**总分分值*/@ExcelIO(value = "总分分值")private String ruleScore;/**得分*/@ExcelIO(value = "得分")private String personnelUserScore;
}

调用方式：

    @Overridepublic void exprotExcel(HttpServletResponse response, ScDetailsReview scDetailsReview) {//个人能力List<ScPersonalDetailedExcelVo> personalDetailedExcelVoList= scPersonalDetailedService.selectExcel(scDetailsReview);//工作业绩List<ScPostDetailedExcelVo> scPostDetailedExcelVoList= scPostDetailedService.selectExcel(scDetailsReview);//额外List<ScOtherDetailedExcelVo> scOtherDetailedExcelVoList= scOtherDetailedService.selectExcel(scDetailsReview);ScPerformanceForChildExcelVo scPerformanceForChildExcelVo=new ScPerformanceForChildExcelVo();scPerformanceForChildExcelVo.setScPersonalDetailedExcelVoList(personalDetailedExcelVoList);scPerformanceForChildExcelVo.setScPostDetailedExcelVoList(scPostDetailedExcelVoList);scPerformanceForChildExcelVo.setScOtherDetailedExcelVoList(scOtherDetailedExcelVoList);ExcelUtil<ScPerformanceForChildExcelVo> scPerformanceForChildExcelVoExcelUtil=new ExcelUtil<>(ScPerformanceForChildExcelVo.class);scPerformanceForChildExcelVoExcelUtil.getExcels(scPerformanceForChildExcelVo,response);}

3、工具类

注解类：

package org.jeecg.utils;import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;@Target(ElementType.FIELD)
@Retention(RetentionPolicy.RUNTIME)
public @interface ExcelIO {/** 字段名称 */String value();/** 导出映射，格式如：0-未知;1-男;2-女 */String kv() default "";
}

ExcelUtil：

package org.jeecg.utils;import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.lang.reflect.Field;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;public class ExcelUtil<T> {//泛型public Class<T> clazz;public Workbook workbook;//sheet对象public Sheet sheet;//标题行总列数private Integer tableNames;//样式集合private Map<String,CellStyle> styleMap=new HashMap<>();//需要导出字段private List<Field> fieldList=new ArrayList<>();public ExcelUtil(Class<T> clazz){this.clazz = clazz;}//创建样式private void setStyleMap(){CellStyle style = workbook.createCellStyle();style.setAlignment(HorizontalAlignment.CENTER);style.setVerticalAlignment(VerticalAlignment.CENTER);Font titleFont = workbook.createFont();titleFont.setFontName("宋体");titleFont.setFontHeightInPoints((short) 9);titleFont.setBold(true);style.setFont(titleFont);style.setWrapText(true);//标题样式styleMap.put("title", style);}//设置单元格宽度private void setWidth(Sheet sheet,Integer colNum){for (int i = 0; i < colNum; i++) {sheet.autoSizeColumn(i);
//            int columnWidth = sheet.getColumnWidth(i);
//            sheet.setColumnWidth(colNum,Math.min(sheet.getColumnWidth(i)+1000,15*256));}}//创建表头private void setTableName(Class clazz,Sheet sheet,Integer rowNum){//创建标题List<String> tiltes=new ArrayList<>();Field[] fields = clazz.getDeclaredFields();for (Field field : fields) {//获取字段属性ExcelIO annotation = field.getAnnotation(ExcelIO.class);if(null!=annotation){String value = annotation.value();//需要的标题tiltes.add(value);//需要的字段fieldList.add(field);}}//写入标题tableNames=tiltes.size();Row row = sheet.createRow(rowNum);for (int i = 0; i < tableNames; i++) {Cell cell = row.createCell(i);cell.setCellValue(tiltes.get(i));cell.setCellStyle(styleMap.get("title"));}}//创建标题行private void setTilte(String tilte){//创建标题Row row = sheet.createRow(0);Cell cell = row.createCell(0);cell.setCellValue(tilte);cell.setCellStyle(styleMap.get("title"));//合并sheet.addMergedRegion(new CellRangeAddress(0,0,0,tableNames-1));}//写入数据private void setData(List<T> data,Integer rowNum){for (Object datum : data) {Row row = sheet.createRow(rowNum);rowNum++;for (Integer integer = 0; integer < tableNames; integer++) {Cell cell = row.createCell(integer);Field field = fieldList.get(integer);cell.setCellValue(changeValue(field,datum));}}}//写入数据private void setDataForChildeSheet(List<Object> data,Sheet sheet,Integer rowNum){for (Object datum : data) {Row row = sheet.createRow(rowNum);rowNum++;for (Integer integer = 0; integer < tableNames; integer++) {Cell cell = row.createCell(integer);Field field = fieldList.get(integer);cell.setCellValue(changeValue(field,datum));}}}//有需要转换的值private String changeValue(Field field,Object data){try {field.setAccessible(true);String filed = null==field.get(data)?"":field.get(data).toString();if(null==filed){return "";}ExcelIO annotation = field.getAnnotation(ExcelIO.class);if(null!=annotation){String value = annotation.kv();if(null==value || "".equals(value)){return filed;}String[] split = value.split(";");for (String s : split) {String[] split1 = s.split("-");if(split1.length>=2){if(split1[0].equals(filed)){return split1[1];}}}}return "";} catch (IllegalAccessException e) {return "";}}//多sheet页其中一个private void setSheetData(Sheet sheet1, Class<?> genericClass, List<Object> o) {//创建标题setTableName(genericClass,sheet1,0);//写数据setDataForChildeSheet(o,sheet1,1);//设置宽度setWidth(sheet1,tableNames);//清除存在的数据fieldList.clear();tableNames=0;}//导出excelpublic void getExcel(List<T> data, HttpServletResponse response,String name){response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");response.setCharacterEncoding("utf-8");// 创建一个新的工作薄workbook = new XSSFWorkbook();// 创建一个工作表sheet = workbook.createSheet("Sheet1");//初始化样式setStyleMap();//创建表头setTableName(clazz,sheet,1);//创建标题setTilte(name);//写入数据setData(data,2);//设置宽度setWidth(sheet,tableNames);//返回给前端try {workbook.write(response.getOutputStream());} catch (IOException e) {throw new RuntimeException(e);}}//导出多个sheet页,传入的data的内部是多个list，list泛型就是各个sheet的数据，且泛型需要用excle注解进行设置public void getExcels(T data, HttpServletResponse response){response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");response.setCharacterEncoding("utf-8");// 创建一个新的工作薄workbook = new XSSFWorkbook();//初始化样式setStyleMap();//获取子类class对象Field[] declaredFields = clazz.getDeclaredFields();Integer i=0;for (Field declaredField : declaredFields) {Type genericType = declaredField.getGenericType();if (genericType instanceof ParameterizedType) {ParameterizedType parameterizedType = (ParameterizedType) genericType;Type[] typeArguments = parameterizedType.getActualTypeArguments();if (typeArguments.length > 0) {//子类class对象Class<?> genericClass = (Class<?>) typeArguments[0];try {declaredField.setAccessible(true);//获取子类数据List<Object> o = (List)declaredField.get(data);if(null!=o && o.size()>0){// 创建子工作表Sheet sheet1 = workbook.createSheet("Sheet"+i);i++;//为子工作表赋值setSheetData(sheet1,genericClass,o);}} catch (IllegalAccessException e) {return;}}}}//返回给前端try {workbook.write(response.getOutputStream());} catch (IOException e) {throw new RuntimeException(e);}}}