Spring Boot 匯出Excel表格

新增支援


<!--新增匯入/出表格依賴-->
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>3.9</version>
</dependency>


新建Excel實體類

import java.io.Serializable;
import
 
 java.util.List;

public class ExcelData implements Serializable {
    private static final long serialVersionUID = 4444017239100620999L;

    // 表頭
    private List<String> titles;

    // 資料
    private List<List<Object>> rows;

    // 頁簽名稱
    private String name;

    public List<String> getTitles
 
() {
        return titles;
    }

    public void setTitles(List<String> titles) {
        this.titles = titles;
    }

    public List<List<Object>> getRows() {
        return rows;
    }

    public void setRows(List<List<Object>> rows) {
        this.rows = rows;
    }

    public
 
 String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

新增excel工具類

import javax.servlet.http.HttpServletResponse;
import java.awt.*;
import java.io.OutputStream;
import java.util.List;

import com.soft.ssmproject.entity.ExcelData;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.xssf.usermodel.XSSFCellStyle;
import org.apache.poi.xssf.usermodel.XSSFColor;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.apache.poi.xssf.usermodel.extensions.XSSFCellBorder.BorderSide;

import java.awt.Color;
import java.net.URLEncoder;

public class ExcelUtils {
    public static void exportExcel(HttpServletResponse response, String fileName, ExcelData data) throws Exception {
        // 告訴瀏覽器用什麼軟體可以開啟此檔案
        response.setHeader("content-Type", "application/vnd.ms-excel");
        // 下載檔案的預設名稱
        response.setHeader("Content-Disposition", "attachment;filename="+URLEncoder.encode(fileName, "utf-8"));
        exportExcel(data, response.getOutputStream());
    }

    public static void exportExcel(ExcelData data, OutputStream out) throws Exception {

        XSSFWorkbook wb = new XSSFWorkbook();
        try {
            String sheetName = data.getName();
            if (null == sheetName) {
                sheetName = "Sheet1";
            }
            XSSFSheet sheet = wb.createSheet(sheetName);
            writeExcel(wb, sheet, data);

            wb.write(out);
        } catch(Exception e){
            e.printStackTrace();
        }finally{
            //此處需要關閉 wb 變數
            out.close();
        }
    }

    private static void writeExcel(XSSFWorkbook wb, Sheet sheet, ExcelData data) {

        int rowIndex = 0;

        rowIndex = writeTitlesToExcel(wb, sheet, data.getTitles());
        writeRowsToExcel(wb, sheet, data.getRows(), rowIndex);
        autoSizeColumns(sheet, data.getTitles().size() + 1);

    }

    private static int writeTitlesToExcel(XSSFWorkbook wb, Sheet sheet, List<String> titles) {
        int rowIndex = 0;
        int colIndex = 0;

        Font titleFont = wb.createFont();
        titleFont.setFontName("simsun");
        //titleFont.setBoldweight(Short.MAX_VALUE);
        // titleFont.setFontHeightInPoints((short) 14);
        titleFont.setColor(IndexedColors.BLACK.index);

        XSSFCellStyle titleStyle = wb.createCellStyle();
        titleStyle.setAlignment(XSSFCellStyle.ALIGN_CENTER);
        titleStyle.setVerticalAlignment(XSSFCellStyle.VERTICAL_CENTER);
        titleStyle.setFillForegroundColor(new XSSFColor(new Color(182, 184, 192)));
        titleStyle.setFillPattern(XSSFCellStyle.SOLID_FOREGROUND);
        titleStyle.setFont(titleFont);
        setBorder(titleStyle, BorderStyle.THIN, new XSSFColor(new Color(0, 0, 0)));

        Row titleRow = sheet.createRow(rowIndex);
        // titleRow.setHeightInPoints(25);
        colIndex = 0;

        for (String field : titles) {
            Cell cell = titleRow.createCell(colIndex);
            cell.setCellValue(field);
            cell.setCellStyle(titleStyle);
            colIndex++;
        }

        rowIndex++;
        return rowIndex;
    }

    private static int writeRowsToExcel(XSSFWorkbook wb, Sheet sheet, List<List<Object>> rows, int rowIndex) {
        int colIndex = 0;

        Font dataFont = wb.createFont();
        dataFont.setFontName("simsun");
        // dataFont.setFontHeightInPoints((short) 14);
        dataFont.setColor(IndexedColors.BLACK.index);

        XSSFCellStyle dataStyle = wb.createCellStyle();
        dataStyle.setAlignment(XSSFCellStyle.ALIGN_CENTER);
        dataStyle.setVerticalAlignment(XSSFCellStyle.VERTICAL_CENTER);
        dataStyle.setFont(dataFont);
        setBorder(dataStyle, BorderStyle.THIN, new XSSFColor(new Color(0, 0, 0)));

        for (List<Object> rowData : rows) {
            Row dataRow = sheet.createRow(rowIndex);
            // dataRow.setHeightInPoints(25);
            colIndex = 0;

            for (Object cellData : rowData) {
                Cell cell = dataRow.createCell(colIndex);
                if (cellData != null) {
                    cell.setCellValue(cellData.toString());
                } else {
                    cell.setCellValue("");
                }

                cell.setCellStyle(dataStyle);
                colIndex++;
            }
            rowIndex++;
        }
        return rowIndex;
    }

    private static void autoSizeColumns(Sheet sheet, int columnNumber) {

        for (int i = 0; i < columnNumber; i++) {
            int orgWidth = sheet.getColumnWidth(i);
            sheet.autoSizeColumn(i, true);
            int newWidth = (int) (sheet.getColumnWidth(i) + 100);
            if (newWidth > orgWidth) {
                sheet.setColumnWidth(i, newWidth);
            } else {
                sheet.setColumnWidth(i, orgWidth);
            }
        }
    }

    private static void setBorder(XSSFCellStyle style, BorderStyle border, XSSFColor color) {
        style.setBorderTop(border);
        style.setBorderLeft(border);
        style.setBorderRight(border);
        style.setBorderBottom(border);
        style.setBorderColor(BorderSide.TOP, color);
        style.setBorderColor(BorderSide.LEFT, color);
        style.setBorderColor(BorderSide.RIGHT, color);
        style.setBorderColor(BorderSide.BOTTOM, color);
    }
}

# controller層

import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpServletResponse;

import com.soft.ssmproject.entity.ExcelData;
import com.soft.ssmproject.entity.ExcelInfo;
import com.soft.ssmproject.tool.ExcelUtils;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/excel")
public class ExcelController {
     @RequestMapping(value = "/export", method = RequestMethod.POST)
        public void excel(HttpServletResponse response,ExcelInfo excelInfo) throws Exception {
            ExcelData data = new ExcelData();
            data.setName("使用者資訊資料");
            //新增表頭
            List<String> titles = new ArrayList();
            //for(String title: excelInfo.getNames())
            titles.add(excelInfo.getNames()[0]);
            titles.add(excelInfo.getAccount()[0]);
            titles.add(excelInfo.getDept()[0]);
            titles.add(excelInfo.getGender()[0]);
            titles.add(excelInfo.getEmail()[0]);
            data.setTitles(titles);
            //新增列
            List<List<Object>> rows = new ArrayList();
            List<Object> row = null;
           for(int i=1; i<excelInfo.getNames().length;i++){
               row=new ArrayList();
               row.add(excelInfo.getNames()[i]);
               row.add(excelInfo.getAccount()[i]);
               row.add(excelInfo.getDept()[i]);
               row.add(excelInfo.getGender()[i]);
               row.add(excelInfo.getEmail()[i]);
               rows.add(row);

           }

         data.setRows(rows);

            SimpleDateFormat fdate=new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss");
            String fileName=fdate.format(new Date())+".xls";
            ExcelUtils.exportExcel(response, fileName, data);
        }
}