注解到处excel

package com.cxy.domain.poi;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.FIELD)
public @interface ExcelAttribute {
    /** 对应的列名称 */
    String name() default "";

    /** excel列的索引 */
    int sort();

    /** 字段类型对应的格式 */
    String format() default "";
        }

package com.ihrm.common.poi;

import com.ihrm.domain.poi.ExcelAttribute;
import lombok.Getter;
import lombok.Setter;
import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
import org.apache.poi.ss.formula.functions.T;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Field;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;

/**
 * 导出Excel工具类
 *      基于模板打印的方式导出：
 */
@Getter
@Setter
public class ExcelExportUtil<T> {

    private int rowIndex;       //写入数据的起始行
    private int styleIndex;     //需要提取的样式所在的行号
    private Class clazz;        //对象的字节码
    private Field fields[];     //对象中的所有属性

    public ExcelExportUtil(Class clazz,int rowIndex,int styleIndex) {
        this.clazz = clazz;
        this.rowIndex = rowIndex;
        this.styleIndex = styleIndex;
        fields = clazz.getDeclaredFields();
    }

    /**
     * 基于注解导出
             参数：
                response：
                InputStream:模板的输入流
                objs：数据
                fileName：生成的文件名
     *
     */
    public void export(HttpServletResponse response,InputStream is, List<T> objs,String fileName) throws Exception {

        //1.根据模板创建工作簿
        XSSFWorkbook workbook = new XSSFWorkbook(is);
        //2.读取工作表
        Sheet sheet = workbook.getSheetAt(0);
        //3.提取公共的样式
        CellStyle[] styles = getTemplateStyles(sheet.getRow(styleIndex));
        //4.根据数据创建每一行和每一个单元格的数据2
        AtomicInteger datasAi = new AtomicInteger(rowIndex); //数字
        for (T t : objs) {
            //datasAi.getAndIncrement()  ：获取数字，并++    i++
            Row row = sheet.createRow(datasAi.getAndIncrement());
            for(int i=0;i<styles.length;i++) {
                Cell cell = row.createCell(i);
                cell.setCellStyle(styles[i]);
                for (Field field : fields) {
                    if(field.isAnnotationPresent(ExcelAttribute.class)){
                        field.setAccessible(true);
                        ExcelAttribute ea = field.getAnnotation(ExcelAttribute.class);
                        if(i == ea.sort()) {
                            if(field.get(t) != null) {
                                cell.setCellValue(field.get(t).toString());
                            }
                        }
                    }
                }
            }
        }
        fileName = URLEncoder.encode(fileName, "UTF-8");
        response.setContentType("application/octet-stream");
        response.setHeader("content-disposition", "attachment;filename=" + new String(fileName.getBytes("ISO8859-1")));
        response.setHeader("filename", fileName);
        workbook.write(response.getOutputStream());
    }

    public CellStyle[] getTemplateStyles(Row row) {
        CellStyle [] styles = new CellStyle[row.getLastCellNum()];
        for(int i=0;i<row.getLastCellNum();i++) {
            styles[i] = row.getCell(i).getCellStyle();
        }
        return styles;
    }
}

package com.ihrm.common.poi;

import com.ihrm.domain.poi.ExcelAttribute;
import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
import org.apache.poi.ss.format.CellFormat;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.DateUtil;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

import java.io.FileInputStream;
import java.io.InputStream;
import java.lang.reflect.Field;
import java.math.BigDecimal;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;


public class ExcelImportUtil<T> {
 
    private Class clazz;
    private  Field fields[];
 
    public ExcelImportUtil(Class clazz) {
        this.clazz = clazz;
        fields = clazz.getDeclaredFields();
    }
 
    /**
     * 基于注解读取excel
     */
    public List<T> readExcel(InputStream is, int rowIndex,int cellIndex) {
        List<T> list = new ArrayList<T>();
        T entity = null;
        try {
            XSSFWorkbook workbook = new XSSFWorkbook(is);
            Sheet sheet = workbook.getSheetAt(0);
            // 不准确
            int rowLength = sheet.getLastRowNum();

            System.out.println(sheet.getLastRowNum());
            for (int rowNum = rowIndex; rowNum <= sheet.getLastRowNum(); rowNum++) {
                Row row = sheet.getRow(rowNum);
                entity = (T) clazz.newInstance();
                System.out.println(row.getLastCellNum());
                for (int j = cellIndex; j < row.getLastCellNum(); j++) {
                    Cell cell = row.getCell(j);
                    for (Field field : fields) {
                        if(field.isAnnotationPresent(ExcelAttribute.class)){
                            field.setAccessible(true);
                            ExcelAttribute ea = field.getAnnotation(ExcelAttribute.class);
                            if(j == ea.sort()) {
                                field.set(entity, covertAttrType(field, cell));
                            }
                        }
                    }
                }
                list.add(entity);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return list;
    }
 

    /**
     * 类型转换 将cell 单元格格式转为 字段类型
     */
    private Object covertAttrType(Field field, Cell cell) throws Exception {
        String fieldType = field.getType().getSimpleName();
        if ("String".equals(fieldType)) {
            return getValue(cell);
        }else if ("Date".equals(fieldType)) {
            return new SimpleDateFormat("yyyy-MM-dd hh:mm:ss").parse(getValue(cell)) ;
        }else if ("int".equals(fieldType) || "Integer".equals(fieldType)) {
            return Integer.parseInt(getValue(cell));
        }else if ("double".equals(fieldType) || "Double".equals(fieldType)) {
            return Double.parseDouble(getValue(cell));
        }else {
            return null;
        }
    }
 
 
    /**
     * 格式转为String
     * @param cell
     * @return
     */
    public String getValue(Cell cell) {
        if (cell == null) {
            return "";
        }
        switch (cell.getCellType()) {
            case STRING:
                return cell.getRichStringCellValue().getString().trim();
            case NUMERIC:
                if (DateUtil.isCellDateFormatted(cell)) {
                    Date dt = DateUtil.getJavaDate(cell.getNumericCellValue());
                    return new SimpleDateFormat("yyyy-MM-dd hh:mm:ss").format(dt);
                } else {
                    // 防止数值变成科学计数法
                    String strCell = "";
                    Double num = cell.getNumericCellValue();
                    BigDecimal bd = new BigDecimal(num.toString());
                    if (bd != null) {
                        strCell = bd.toPlainString();
                    }
                    // 去除 浮点型 自动加的 .0
                    if (strCell.endsWith(".0")) {
                        strCell = strCell.substring(0, strCell.indexOf("."));
                    }
                    return strCell;
                }
            case BOOLEAN:
                return String.valueOf(cell.getBooleanCellValue());
            default:
                return "";
        }
    }
}

package com.ihrm.common.utils;

import org.apache.poi.ss.usermodel.Workbook;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;

public class DownloadUtils {
    public void download(ByteArrayOutputStream byteArrayOutputStream, HttpServletResponse response, String returnName) throws IOException {
        response.setContentType("application/octet-stream");
        returnName = response.encodeURL(new String(returnName.getBytes(),"iso8859-1"));            //保存的文件名,必须和页面编码一致,否则乱码
        response.addHeader("content-disposition","attachment;filename=" + returnName);
        response.setContentLength(byteArrayOutputStream.size());
        ServletOutputStream outputstream = response.getOutputStream();    //取得输出流
        byteArrayOutputStream.writeTo(outputstream);                    //写到输出流
        byteArrayOutputStream.close();                                    //关闭
        outputstream.flush();                                            //刷数据
    }
}

  @RequestMapping(value = "/export/{month}", method = RequestMethod.GET)
    public void export(@PathVariable String month) throws Exception {
        //1.获取报表数据
        List<EmployeeReportResult> list = userCompanyPersonalService.findByReport(companyId,month);
        //2.构造Excel
        //创建工作簿
        //SXSSFWorkbook : 百万数据报表
        //Workbook wb = new XSSFWorkbook();
        SXSSFWorkbook wb = new SXSSFWorkbook(100); //阈值，内存中的对象数量最大数量
        //构造sheet
        Sheet sheet = wb.createSheet();
        //创建行
        //标题
        String [] titles = "编号,姓名,手机,最高学历,国家地区,护照号,籍贯,生日,属相,入职时间,离职类型,离职原因,离职时间".split(",");
        //处理标题
        Resource resource = new ClassPathResource("excel-template/hr-demo.xlsx");
        Row row = sheet.createRow(0);

        int titleIndex=0;
        for (String title : titles) {
            Cell cell = row.createCell(titleIndex++);
            cell.setCellValue(title);
        }

        int rowIndex = 1;
        Cell cell=null;
        for(int i=0;i<10000;i++){
        for (EmployeeReportResult employeeReportResult : list) {
            row = sheet.createRow(rowIndex++);
            // 编号,
            cell = row.createCell(0);
            cell.setCellValue(employeeReportResult.getUserId());
            // 姓名,
            cell = row.createCell(1);
            cell.setCellValue(employeeReportResult.getUsername());
            // 手机,
            cell = row.createCell(2);
            cell.setCellValue(employeeReportResult.getMobile());
            // 最高学历,
            cell = row.createCell(3);
            cell.setCellValue(employeeReportResult.getTheHighestDegreeOfEducation());
            // 国家地区,
            cell = row.createCell(4);
            cell.setCellValue(employeeReportResult.getNationalArea());
            // 护照号,
            cell = row.createCell(5);
            cell.setCellValue(employeeReportResult.getPassportNo());
            // 籍贯,
            cell = row.createCell(6);
            cell.setCellValue(employeeReportResult.getNativePlace());
            // 生日,
            cell = row.createCell(7);
            cell.setCellValue(employeeReportResult.getBirthday());
            // 属相,
            cell = row.createCell(8);
            cell.setCellValue(employeeReportResult.getZodiac());
            // 入职时间,
            cell = row.createCell(9);
            cell.setCellValue(employeeReportResult.getTimeOfEntry());
            // 离职类型,
            cell = row.createCell(10);
            cell.setCellValue(employeeReportResult.getTypeOfTurnover());
            // 离职原因,
            cell = row.createCell(11);
            cell.setCellValue(employeeReportResult.getReasonsForLeaving());
            // 离职时间
            cell = row.createCell(12);
            cell.setCellValue(employeeReportResult.getResignationTime());
        }
        }
        //3.完成下载
        ByteArrayOutputStream os = new ByteArrayOutputStream();
        wb.write(os);
        new DownloadUtils().download(os,response,month+"人事报表.xlsx");
    }

    /**
     * 采用模板打印的形式完成报表生成
     *      模板
     *  参数：
     *      年月-月（2018-02%）
     *
     *      sxssf对象不支持模板打印
     */
//    @RequestMapping(value = "/export/{month}", method = RequestMethod.GET)
//    public void export(@PathVariable String month) throws Exception {
//        //1.获取报表数据
//        List<EmployeeReportResult> list = userCompanyPersonalService.findByReport(companyId,month);
//
//        //2.加载模板
//        Resource resource = new ClassPathResource("excel-template/hr-demo.xlsx");
//        FileInputStream fis = new FileInputStream(resource.getFile());
//
//        //3.通过工具类完成下载
////        new ExcelExportUtil(EmployeeReportResult.class,2,2).
////                export(response,fis,list,month+"人事报表.xlsx");
//
//
//        //3.根据模板创建工作簿
//        Workbook wb = new XSSFWorkbook(fis);
//        //4.读取工作表
//        Sheet sheet = wb.getSheetAt(0);
//        //5.抽取公共样式
//        Row row = sheet.getRow(2);
//        CellStyle styles [] = new CellStyle[row.getLastCellNum()];
//        for(int i=0;i<row.getLastCellNum();i++) {
//            Cell cell = row.getCell(i);
//            styles[i] = cell.getCellStyle();
//        }
//        //6.构造单元格
//        int rowIndex = 2;
//        Cell cell=null;
//        for(int i=0;i<10000;i++) {
//            for (EmployeeReportResult employeeReportResult : list) {
//                row = sheet.createRow(rowIndex++);
//                // 编号,
//                cell = row.createCell(0);
//                cell.setCellValue(employeeReportResult.getUserId());
//                cell.setCellStyle(styles[0]);
//                // 姓名,
//                cell = row.createCell(1);
//                cell.setCellValue(employeeReportResult.getUsername());
//                cell.setCellStyle(styles[1]);
//                // 手机,
//                cell = row.createCell(2);
//                cell.setCellValue(employeeReportResult.getMobile());
//                cell.setCellStyle(styles[2]);
//                // 最高学历,
//                cell = row.createCell(3);
//                cell.setCellValue(employeeReportResult.getTheHighestDegreeOfEducation());
//                cell.setCellStyle(styles[3]);
//                // 国家地区,
//                cell = row.createCell(4);
//                cell.setCellValue(employeeReportResult.getNationalArea());
//                cell.setCellStyle(styles[4]);
//                // 护照号,
//                cell = row.createCell(5);
//                cell.setCellValue(employeeReportResult.getPassportNo());
//                cell.setCellStyle(styles[5]);
//                // 籍贯,
//                cell = row.createCell(6);
//                cell.setCellValue(employeeReportResult.getNativePlace());
//                cell.setCellStyle(styles[6]);
//                // 生日,
//                cell = row.createCell(7);
//                cell.setCellValue(employeeReportResult.getBirthday());
//                cell.setCellStyle(styles[7]);
//                // 属相,
//                cell = row.createCell(8);
//                cell.setCellValue(employeeReportResult.getZodiac());
//                cell.setCellStyle(styles[8]);
//                // 入职时间,
//                cell = row.createCell(9);
//                cell.setCellValue(employeeReportResult.getTimeOfEntry());
//                cell.setCellStyle(styles[9]);
//                // 离职类型,
//                cell = row.createCell(10);
//                cell.setCellValue(employeeReportResult.getTypeOfTurnover());
//                cell.setCellStyle(styles[10]);
//                // 离职原因,
//                cell = row.createCell(11);
//                cell.setCellValue(employeeReportResult.getReasonsForLeaving());
//                cell.setCellStyle(styles[11]);
//                // 离职时间
//                cell = row.createCell(12);
//                cell.setCellValue(employeeReportResult.getResignationTime());
//                cell.setCellStyle(styles[12]);
//            }
//        }
//        //7.下载
//        //3.完成下载
//        ByteArrayOutputStream os = new ByteArrayOutputStream();
//        wb.write(os);
//        new DownloadUtils().download(os,response,month+"人事报表.xlsx");
//    }
}