Java 后端 Excel导出

1.在pom.xml中添加依赖

<!-- 导出excel https://mvnrepository.com/artifact/org.apache.poi/poi -->
		<dependency>
			<groupId>org.apache.poi</groupId>
			<artifactId>poi</artifactId>
			<version>3.6</version>
		</dependency>

2.添加excel表生成工具类ExcelUtil.java

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;

public class ExcelUtil {

	/**
     * 导出Excel
     * @param sheetName sheet名称
     * @param title 标题
     * @param values 内容
     * @param wb HSSFWorkbook对象
     * @return
     */
    public static HSSFWorkbook getHSSFWorkbook(String sheetName,String []title,String [][]values, HSSFWorkbook wb){
 
    	
        //创建一个HSSFWorkbook，对应一个Excel文件
        if(wb == null){
            wb = new HSSFWorkbook();
        }
        //在workbook中添加一个sheet,对应Excel文件中的sheet
        HSSFSheet sheet = wb.createSheet(sheetName);
        //设置列宽
        sheet.setColumnWidth(0, 20 * 330);
        sheet.setColumnWidth(1, 20 * 130);
        sheet.setColumnWidth(2, 20 * 400);
        sheet.setColumnWidth(3, 20 * 400);
        sheet.setColumnWidth(4, 20 * 400);
        sheet.setColumnWidth(5, 20 * 330);
        sheet.setColumnWidth(6, 20 * 400);
        sheet.setColumnWidth(7, 20 * 800);

        // 第三步，在sheet中添加表头第0行,注意老版本poi对Excel的行数列数有限制
        HSSFRow row = sheet.createRow(0);

        // 第四步，创建单元格，并设置值表头 设置表头居中
        HSSFCellStyle style = wb.createCellStyle();
        style.setAlignment(HSSFCellStyle.ALIGN_LEFT); // 创建一个居中格式

        //声明列对象
        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++){
                //将内容按顺序赋给对应的列对象
                row.createCell(j).setCellValue(values[i][j]);
            }
        }
        return wb;
    }

}

3.数据转换类DeviceExportBuilder.java

package com.cloudthings.maintenance.utils.export;

import java.util.ArrayList;
import java.util.List;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.aspectj.weaver.ast.And;

import com.cloudthings.maintenance.device.model.DeviceQueryModel;

public class DeviceExportBuilder {
	private static String[] titles = { "设备SN号", "设备类型", "签约单位", "项目名称", "梯号", "注册代码", "所在地区", "详细地址" };

	/**
	 * 对外接口 构建Excel表
	 * 
	 * @param datas
	 * @param areas
	 * @param searchKey
	 */
	public static HSSFWorkbook buildExcel(List<DeviceQueryModel> datas, List<Area> areas, String searchKey) {
		List<DeviceExportModel> eds = getContent(datas, areas);
		
		// excel文件名
		String fileName = "[" + searchKey + "]设备表.xls";

		// sheet名
		String sheetName = "设备";
		String[][] content = new String[eds.size()][titles.length];
		if (eds.size() > 0)
			for (int i = 0; i < eds.size(); i++) {
				content[i][0] = eds.get(i).getSn();
				content[i][1] = eds.get(i).getDevTypeStr();
				content[i][2] = eds.get(i).getBuyCompanyName();
				content[i][3] = eds.get(i).getProjectName();
				content[i][4] = eds.get(i).getEvOrder();
				content[i][5] = eds.get(i).getRegCode();
				content[i][6] = eds.get(i).getCountyName();
				content[i][7] = eds.get(i).getProjectAddress();
			}
		// 创建HSSFWorkbook
		return ExcelUtil.getHSSFWorkbook(sheetName, titles, content, null);
	}

	// 构建导出列表的数据
	private static List<DeviceExportModel> getContent(List<DeviceQueryModel> datas, List<Area> areas) {
		List<DeviceExportModel> exportModels = new ArrayList<DeviceExportBuilder.DeviceExportModel>();
		if (datas != null && datas.size() > 0) {
			for (DeviceQueryModel resModel : datas) {
				DeviceExportModel expModel = new DeviceExportModel(resModel.getSn(), resModel.getDeviceType(),
						resModel.getBuyCompanyName(), resModel.getProjectName(), resModel.getEvOrder(),
						resModel.getRegCode(),
						getCountyNameById(resModel.getProvince(), resModel.getCity(), resModel.getCountry(), areas),
						resModel.getAddress());
				exportModels.add(expModel);
			}
		}
		return exportModels;
	}

	// 获取区域信息
	private static String getCountyNameById(Long proId, Long cityId, Long countyId, List<Area> areas) {
		if (proId == null || cityId == null || countyId == null) {
			return "";
		}
		String proStr = "", cityStr = "", countyStr = "";
		for (Area area : areas) {
			if (proId.longValue() == area.getUuid().longValue()) {
				proStr = area.getAreaName();
			}
			if (cityId.longValue() == area.getUuid().longValue()) {
				cityStr = area.getAreaName();
			}
			if (countyId.longValue() == area.getUuid().longValue()) {
				countyStr = area.getAreaName();
			}
		}
		return (proStr + cityStr + countyStr).trim();
	}

	public static class DeviceExportModel {
		private String sn;
		private String devTypeStr;// （1.Nano、2.mix）
		private String buyCompanyName;// 签约公司名称
		private String projectName;
		private String evOrder;
		private String regCode;
		private String countyName;// 所在县,区域 如：四川省成都市天府新区
		private String projectAddress;

		public DeviceExportModel() {
			super();
		}

		public DeviceExportModel(String sn, Integer deviceType, String buyCompanyName, String projectName,
				String evOrder, String regCode, String countyName, String projectAddress) {
			super();
			this.sn = sn == null ? "" : sn;
			this.devTypeStr = (deviceType == null) ? "" : ((deviceType == 1) ? "Nano" : (deviceType == 2 ? "Mix" : ""));
			this.buyCompanyName = buyCompanyName == null ? "" : buyCompanyName;
			this.projectName = projectName == null ? "" : projectName;
			this.evOrder = evOrder == null ? "" : evOrder;
			this.regCode = regCode == null ? "" : regCode;
			this.countyName = countyName == null ? "" : countyName;
			this.projectAddress = projectAddress == null ? "" : projectAddress;
		}
		

		@Override
		public String toString() {
			return "DeviceExportModel [sn=" + sn + ", devTypeStr=" + devTypeStr + ", buyCompanyName=" + buyCompanyName
					+ ", projectName=" + projectName + ", evOrder=" + evOrder + ", regCode=" + regCode + ", countyName="
					+ countyName + ", projectAddress=" + projectAddress + "]";
		}

		public String getSn() {
			return sn;
		}

		public void setSn(String sn) {
			this.sn = sn;
		}

		public String getDevTypeStr() {
			return devTypeStr;
		}

		public void setDevTypeStr(Integer deviceType) {// （1.Nano、2.mix）
			this.devTypeStr = (deviceType == null) ? "" : ((deviceType == 1) ? "Nano" : (deviceType == 2 ? "Mix" : ""));
		}

		public String getBuyCompanyName() {
			return buyCompanyName;
		}

		public void setBuyCompanyName(String buyCompanyName) {
			this.buyCompanyName = buyCompanyName;
		}

		public String getProjectName() {
			return projectName;
		}

		public void setProjectName(String projectName) {
			this.projectName = projectName;
		}

		public String getEvOrder() {
			return evOrder;
		}

		public void setEvOrder(String evOrder) {
			this.evOrder = evOrder;
		}

		public String getRegCode() {
			return regCode;
		}

		public void setRegCode(String regCode) {
			this.regCode = regCode;
		}

		public String getCountyName() {
			return countyName;
		}

		public void setCountyName(String countyName) {
			this.countyName = countyName;
		}

		public String getProjectAddress() {
			return projectAddress;
		}

		public void setProjectAddress(String projectAddress) {
			this.projectAddress = projectAddress;
		}
	}
}

4.在controller中调用

/**
	 * 设备导出
	 * 
	 * @param vo
	 * @return
	 */
	@ApiOperation(value = "设备导出", notes = "设备导出", httpMethod = "GET", produces = MediaType.APPLICATION_JSON_VALUE)
	@RequestMapping(value = "/export", method = RequestMethod.GET)
	@ResponseBody
	@Transactional
	public String deviceExport(HttpServletResponse response,@ModelAttribute("page") PageVO page,
			@ApiParam(required = false, name = "deviceType", value = "设备类型（1报警设备、2多媒体设备）") @RequestParam(value = "deviceType", required = false) Integer deviceType,
			@ApiParam(required = true, name = "projectName", value = "项目名称") @RequestParam(value = "projectName", required = false) String projectName,
			@ApiParam(required = false, name = "buyCompanyName", value = "购买者名字") @RequestParam(value = "buyCompanyName", required = false) String buyCompanyName,			
			@ApiParam(required = false, name = "onlineStatus", value = "在线状态,1：在线，2：离线") @RequestParam(value = "onlineStatus", required = false) Integer onlineStatus) {
		//TokenUtils.checkToken(getToken());
		DeviceQueryModel qm = new DeviceQueryModel();
		page.setPage(1);
		page.setPageSize(100000);
		qm.setPage(buildPage(page));
		qm.setCode(code);
		qm.setPhone(phone);
		qm.setDeviceType(deviceType);
		qm.setEvOrder(evOrder);
		qm.setSn(sn);
		qm.setIsBind(isBind);
		qm.setWtCode(wtCode);
		qm.setProjectName(projectName);
		qm.setBuyCompanyName(buyCompanyName);
		qm.setRegCode(regCode);
		qm.setProvince(province);
		qm.setCity(city);
		qm.setCountry(country);
		if (onlineStatus != null && (onlineStatus.intValue() > Indicator.DEVICE_ONLINE_NO.getCode()
				|| onlineStatus.intValue() < Indicator.DEVICE_ONLINE_YES.getCode())) {
			onlineStatus = Indicator.DEVICE_ONLINE_NO.getCode();
		}
		qm.setOnlineStatus(onlineStatus);
		if(projectName==null||projectName=="") {
			throw new DeviceException(ExceptionStatusDevice.PARAMAS_NEED);
		}
		Page<DeviceQueryModel> deviceModelPage = deviceService.getAdminListByPage(qm);
		String searchKey = projectName;//前端控制只能搜索项目来导出 ，这里默认是搜索的项目名称项目
		List<Area> areas = deviceService.getAreas();
		//将数据处理成excel返回实体
		HSSFWorkbook book = DeviceExportBuilder.buildExcel(deviceModelPage.getResult(), areas, searchKey);
		try {
			//设置返回头
//            response.setHeader("Content-Disposition", "attachment;fileName=" + URLEncoder.encode(searchKey+"设备列表.xls","UTF-8"));
			//处理Mac保存文件名乱码问题
            response.setHeader("Content-Disposition", "attachment;fileName=" + new String((searchKey+"设备列表.xls").getBytes("UTF-8"), "iso-8859-1"));
			OutputStream os = response.getOutputStream();
			book.write(os);
			os.flush();
			os.close();
		} catch (Exception e) {
	       e.printStackTrace();
	       return "Exception";
		}
		return "SUCCESS";
	}

导出Excel效果：