POI 导出工具 实例

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

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.net.URLEncoder;
import java.util.List;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class DownLoadListUtils{


    //封装sheel
    public static void setListMapToExcel(List<Map> ListMap, String sheetName, String[] titleArray, String filePath) {
        try {

            //建立工作簿
            HSSFWorkbook workbook = new HSSFWorkbook();
            //设置sheet页面
            HSSFSheet sheet = workbook.createSheet(sheetName);
            sheet.setDefaultColumnWidth(20);//设置所有列的列宽

            //标题
            setRowTitle(sheet, getTitleCellStyle(workbook), titleArray);

            //内容
            setRowContent(sheet, getContentCellStyle(workbook), ListMap);

            File file = createFile(filePath);
            if (file != null) {
                OutputStream output = new FileOutputStream(file);
                workbook.write(output);
                output.close();
                workbook.close();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

    //创建文件
    private static File createFile(String filePath) {
        try {
            File file = new File(filePath);
            File temp = new File(file.getParent());
            if (!temp.exists()) {
                createDir(file.getParent());
            }
            if (!file.exists()) {
                file.createNewFile();
            }
            return file;
        } catch (Exception e) {
            return null;
        }
    }

    //创建目录
    private static Boolean createDir(String dirPath) {
        File dirFile = new File(dirPath);
        return dirFile.mkdirs();
    }

    //设置标题行
    private static void setRowTitle(HSSFSheet sheet, HSSFCellStyle titleCellStyle, String[] titleArray) {

        HSSFRow row1 = sheet.createRow(0);
        // row1.setHeight((short) (19*200));  // 设置行高

        for (int i = 0; i < titleArray.length; i++) {
            HSSFCell cell1= row1.createCell(i);
            cell1.setCellStyle(titleCellStyle);
            cell1.setCellValue(titleArray[i]);
        }

    }

    //设置内容
    private static void setRowContent(HSSFSheet sheet, HSSFCellStyle contentCellStyle, List<Map> listMap) {
        for (int i = 0; i < listMap.size(); i++) {
            HSSFRow row = sheet.createRow(i + 1);
            Map map = listMap.get(i);
            int j = 0;
            for (Object key : map.keySet()) {
                HSSFCell cell = row.createCell(j);
                cell.setCellStyle(contentCellStyle);
                cell.setCellValue(StringISNULLUtil.mapToString(map.get(key)));
                j++;
            }
        }
    }

    //标题样式
    private static HSSFCellStyle getTitleCellStyle(HSSFWorkbook workbook) {
        //标题样式
        HSSFCellStyle titleCellStyle = workbook.createCellStyle();
        HSSFFont titleFont = workbook.createFont(); //标题字体
        titleFont.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD); //加粗
        titleFont.setFontHeightInPoints((short) 12); //字号
        titleCellStyle.setFont(titleFont);
        titleCellStyle.setWrapText(true);//设置自动换行
        titleCellStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER); //水平居中
        titleCellStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER); //垂直居中
        //设置为文本
        HSSFDataFormat dataFormat = workbook.createDataFormat();
        titleCellStyle.setDataFormat(dataFormat.getFormat("@"));
        //设置边框
        titleCellStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN);
        titleCellStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);
        titleCellStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);
        titleCellStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);
        return titleCellStyle;
    }

  }

接着来

    //内容样式
    private static HSSFCellStyle getContentCellStyle(HSSFWorkbook workbook) {
        //内容样式
        HSSFCellStyle contentCellStyle = workbook.createCellStyle();
        HSSFFont contentFont = workbook.createFont(); //标题字体
//            contentFont.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD); //加粗
        contentFont.setFontHeightInPoints((short) 10); //字号
        contentCellStyle.setFont(contentFont);
//            contentCellStyle.setWrapText(true);//设置自动换行
        contentCellStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER); //水平居中
        contentCellStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER); //垂直居中
        //设置为文本
        HSSFDataFormat dataFormat = workbook.createDataFormat();
        contentCellStyle.setDataFormat(dataFormat.getFormat("@"));
        //设置边框
        contentCellStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN);
        contentCellStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);
        contentCellStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);
        contentCellStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);

        return contentCellStyle;
    }


    /**
     * Excel 文件导出流
     * @param request
     * @param response
     * @param filePath
     * @param fileName
     */
    public static void exportExcel(HttpServletRequest request, HttpServletResponse response, String filePath, String fileName ){
        if(filePath.contains("..")){
            throw new RuntimeException("路径不安全!");
        }
        FileInputStream inputStream=null;
        ServletOutputStream outputStream=null;
        try{
            String projectUrl=request.getContextPath();
            response.setContentType("multipart/form-data");
            String regex="[`~!@#$%^&*()\+\=\{}|:"?><\/r\/n]";
            Pattern pa=Pattern.compile(regex);
            Matcher ma=pa.matcher(fileName);
            if(ma.find()){
                fileName=ma.replaceAll("");
            }
            response.setHeader("content-Disposition","atachment;fileName="+ URLEncoder.encode(fileName+".xls","UTF-8"));
            File file=new File(filePath);
            inputStream=new FileInputStream(file);
            outputStream =response.getOutputStream();
            int b=0;
            byte[] buffer=new byte[512];
            while (b !=- 1){
                b=inputStream.read(buffer);
                outputStream.write(buffer,0,b);
            }
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            if(inputStream!=null){
                try{
                    inputStream.close();
                }catch (IOException e){
                    e.printStackTrace();
                }
            }
            if(outputStream !=null){
                try{
                    outputStream.flush();
                    outputStream.close();
                }catch (IOException e){
                    e.printStackTrace();
                }
            }
        }
    }

使用接口: 

请求1:生产文件

/**
 * 查询采集器列表下载文件
 * @param request
 * @param searchPream
 * @return
 */
@RequestMapping("downLoadFindGpresList")
@ResponseBody
public ResultUtil downLoadFindGpresList(HttpServletRequest request, String searchPream) {
    try {

        //封装数据
        Map search =(Map) JSONUtils.parse(searchPream);

        ResultUtil resultUtil = new ResultUtil();

        DbAdminUser adminUser = (DbAdminUser) request.getAttribute("adminUser");
        Map map = new HashMap();

        map.put("searchGpresNo", StringISNULLUtil.mapToString(search.get("searchGpresNo")));
        map.put("searchGpresAddress", StringISNULLUtil.mapToString(search.get("searchGpresAddress")));
        map.put("searchGpresAdminId", StringISNULLUtil.mapToString(search.get("searchGpresAdminId")));

        if(adminUser.getRoleId()==3){
            map.put("adminUserId", adminUser.getId());
        }
        SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'");
        df.setTimeZone(TimeZone.getTimeZone("UTC"));
        SimpleDateFormat dfMy = new SimpleDateFormat("yyyy-MM-dd");

        String createTimeStart = StringISNULLUtil.mapToString(search.get("searchCreateTimeStart"));
        String createTimeEnd = StringISNULLUtil.mapToString(search.get("searchCreateTimeEnd"));

        if (createTimeEnd != null && !"".equals(createTimeEnd)) {
            map.put("searchCreatTimeEnd", dfMy.format(df.parse(createTimeEnd)));
        } else {
            map.put("searchCreatTimeEnd", "");
        }
        if (createTimeStart != null && !"".equals(createTimeStart)) {
            map.put("searchCreatTimeStart", dfMy.format(df.parse(createTimeStart)));
        } else {
            map.put("searchCreatTimeStart", "");
        }

        //分页查询数据
        map.put("page", 0);
        map.put("limit", 10000);
        List<Map > gpresList=gpresService.findGpresList(map);

        //封装标题
        String[] titleArray={"采集器编号","房东","状态","采集时间","创建人","备注","地址","最大连接数"};

        List<Map> mapList=new ArrayList<>(gpresList.size());
        for(Map mapSqlGpresData: gpresList) {
            Map myMap = new LinkedHashMap();
            myMap.put("gpresNo", mapSqlGpresData.get("gpresNo"));
            myMap.put("adminName", mapSqlGpresData.get("adminName"));
            if (StringISNULLUtil.mapToInteger(mapSqlGpresData.get("gpresStatus")) == 0) {
                myMap.put("gpresStatus", "在线");
            } else if (StringISNULLUtil.mapToInteger(mapSqlGpresData.get("gpresStatus")) == 1) {
                myMap.put("gpresStatus", "离线");
            }
            myMap.put("creatTime", new SimpleDateFormat("yyyy-MM-dd hh:mm:ss").format((Date) mapSqlGpresData.get("creatTime")));
            myMap.put("adminNameCreate", mapSqlGpresData.get("adminNameCreate"));
            myMap.put("bz", mapSqlGpresData.get("bz"));
            myMap.put("gpresAddress", mapSqlGpresData.get("gpresAddress"));
            myMap.put("maxNumber", mapSqlGpresData.get("maxNumber"));
            mapList.add(myMap);
        }
        //文件路径
        String separator= File.separator;
        String dateStr=StringISNULLUtil.mapToString(new Date().getTime());
        String fileName="采集器";
        String filePath=pathDir+dateStr+separator+fileName+".xls";

        //封装到Excel里面
        DownLoadListUtils.setListMapToExcel(mapList,fileName,titleArray,filePath);

        //返回参数
        Map  mapRequest=new HashMap();
        mapRequest.put("time",dateStr);
        mapRequest.put("fileName",fileName);
        resultUtil.setCode(0);
        resultUtil.setMsg("查询成功!");
        resultUtil.setData(mapRequest);
        return resultUtil;
    } catch (Exception e) {
        logger.error("查询采集器列表错误: " + e.getMessage());
        return ResultUtil.error("查询失败!");
    }
}

下载流工具2:

import com.hymzwk.moonlight.config.jwt.JwtIgnore;
import com.hymzwk.moonlight.utils.DownLoadListUtils;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;


@Controller
@RequestMapping("sys/downLoad/")
public class DownLoadListController {

    @Value("${pathDir}")
    private String pathDir;

    /**
     * 管理端模板下载
     *
     * @param request
     * @param response
     */
    @RequestMapping("/downLoadFileExcel/{adminUserId}")
    @JwtIgnore
    @ResponseBody
    public void downLoadFileExcel(@PathVariable("adminUserId") String adminUserId, HttpServletRequest request, HttpServletResponse response,String fileName,String time) {
        try {
            String separator= File.separator;
            String filePath=pathDir+time+separator+fileName+".xls";
            DownLoadListUtils.exportExcel(request,response,filePath,fileName);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }


}