springBoot中Excel导出

依赖
<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi</artifactId>
    <version>3.10.1</version>
</dependency>

//工具类

package com.sk.springboot.Util;

import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.hssf.util.HSSFColor;

public class ExcelWriteUtil {
    public static HSSFWorkbook getHSSFWorkbook(String sheetName, String []title, String [][]values, HSSFWorkbook wb){
        if(wb == null){
            wb = new HSSFWorkbook();
        }
        HSSFSheet sheet = wb.createSheet(sheetName);
        HSSFRow row = sheet.createRow(0);
        HSSFCellStyle style = wb.createCellStyle();
        HSSFFont font=wb.createFont();
        font.setColor(HSSFColor.BLACK.index);//字体颜色
        font.setFontHeightInPoints((short)12);
        font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);//字体增粗
        style.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 创建一个居中格式
        style.setFont(font);

        HSSFCell cell = null;
        //创建标题
        for(int i=0;i<title.length;i++){
            cell = row.createCell(i);
            cell.setCellValue(title[i]);
            cell.setCellStyle(style);
        }
        //创建内容
        for(int i=0;i<values.length;i++){
            row = sheet.createRow(i + 1);
            for(int j=0;j<values[i].length;j++){
                row.createCell(j).setCellValue(values[i][j]);
            }
        }
        return wb;
    }
}

//测试实现类

package com.sk.springboot.Util;

import com.feibo.shikai.springboot.domain.UserD;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import javax.servlet.http.HttpServletResponse;
import java.io.OutputStream;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;

public class ExcelTest {

    public  void exportExcelApiInterfaceLog(HttpServletResponse response) {
        String filename = "ExcelName.xls";
        try {
            this.setResponseHeader(response,filename);
            HSSFWorkbook wb=this.writeExcel();
            OutputStream os = response.getOutputStream();
            wb.write(os);
            os.flush();
            os.close();
        } catch (Exception e) {
           e.printStackTrace();
        }
    }
    public void setResponseHeader(HttpServletResponse response, String fileName) {
        try {
            response.setContentType("application/force-download");
            response.setHeader("Content-Disposition", "attachment;filename="+  URLEncoder.encode(fileName, "UTF-8"));
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }
    public  HSSFWorkbook writeExcel(){
//需要写入的实体类，此处我模拟一个实体类
        UserD u =new UserD();
        u.setId(1L);
        u.setName("sk");
        u.setPwd("123");
        u.setAccount("234");

        List userList = new ArrayList();
        userList.add(u);

        String sheetName="ExcelSheet-Name";
        String[][] values = new String[userList.size()][];
        String[] titles = null;
        titles= new String[]{"id","name","pwd","account"};
            for (int i = 0; i <userList.size() ; i++) {
                values[i] = new String[titles.length];
                //将对象内容转换成string
                UserD obj = (UserD) userList.get(i);
                values[i][0] = obj.getId().toString();
                values[i][1] = obj.getName();
                values[i][2] = obj.getPwd();
                values[i][3] = obj.getAccount();
            }
        HSSFWorkbook wb=ExcelWriteUtil.getHSSFWorkbook(sheetName,titles,values,null);
        return wb;
    }

}