SpringBoot +EasyExcel 实现excel 导出功能一般流程

第一步：SpringBoot 项目添加EasyExcel  相关依赖：

		
		
			com.alibaba
			easyexcel
			1.1.2-beat1
		

第二步：编写EasyExcel 导出excel 的实体对象：

注意：EasyExcel 导出实体对象必须继承com.alibaba.excel.metadata.BaseRowModel 类

import java.io.Serializable;
import java.util.Date;

import com.alibaba.excel.annotation.ExcelProperty;
import com.alibaba.excel.metadata.BaseRowModel;

@SuppressWarnings("serial")
public class XXXExcel extends BaseRowModel implements Serializable {
	@ExcelProperty(value = "用户名称", index = 0)
    private String username;
	@ExcelProperty(value = "IP地址", index = 1)
    private String ipAddress;
	@ExcelProperty(value = "日期", index = 2, format="yyyy-MM-dd")
    private Date createTime;
	@ExcelProperty(value = "日志描述", index = 3)
    private String logDesc;
	public String getUsername() {
		return username;
	}
	public void setUsername(String username) {
		this.username = username;
	}
	public String getIpAddress() {
		return ipAddress;
	}
	public void setIpAddress(String ipAddress) {
		this.ipAddress = ipAddress;
	}
	public Date getCreateTime() {
		return createTime;
	}
	public void setCreateTime(Date createTime) {
		this.createTime = createTime;
	}
	public String getLogDesc() {
		return logDesc;
	}
	public void setLogDesc(String logDesc) {
		this.logDesc = logDesc;
	}
}

第三：SpringMVC 中的Controller 层调用orm框架(jpa\hibernate\mybatis)完成数据查询转换为对应的实体对象，我们再将查询的实体对象转换为EasyExcel 导出的实体对象。

示列代码：

@ApiOperation(httpMethod = "GET", value = "后台日志文件导出功能")
	@RequestMapping(value="/export", method={RequestMethod.GET})
	@ApiImplicitParams({
		@ApiImplicitParam(name = "username", value = "用户名称", required = false, dataType = "String", paramType = "query"),
		@ApiImplicitParam(name = "ipAddress", value = "IP地址", required = false, dataType = "String", paramType = "query"),
		@ApiImplicitParam(name = "page", value = "页码", required = false, dataType = "Integer", paramType = "query"),
		@ApiImplicitParam(name = "limit", value = "页面大小", required = false, dataType = "Integer", paramType = "query") })
	public void fileDownload(HttpServletRequest request, HttpServletResponse response) throws IOException{
		response.setContentType("application/vnd.ms-excel;charset=utf-8");
		response.setHeader("Content-disposition", "attachment;filename=" + URLEncoder.encode("审计日志.xlsx", "UTF8"));
		response.setHeader("FileName", URLEncoder.encode("审计日志.xlsx", "UTF8"));
		// 解析请求参数
		String username = request.getParameter("username");
		String ipAddress = request.getParameter("ipAddress");
		String page = request.getParameter("page");
		String limit = request.getParameter("limit");
		Map params = new HashMap();
		if(!StringUtils.isEmpty(username)){
			params.put("username", username);
		}
		if(!StringUtils.isEmpty(ipAddress)){
			params.put("ipAddress", ipAddress);
		}
		if (!StringUtils.isEmpty(page)) {
			params.put("page", Integer.valueOf(page));
		}
		if (!StringUtils.isEmpty(limit)) {
			params.put("limit", Integer.valueOf(limit));
		}
		// MyBatis 数据查询
		PageParam rb = super.initPageBounds(params);
		PageInfo list = service.selectPageList(params, rb);
		List lists = list.getList(); 
		// 查询实体转换为EasyExcel 导出实体
		List rows = new ArrayList();
		if(!CollectionUtils.isEmpty(lists)){
			lists.stream().forEach(item->{
				XXXRecordExcel excel = new XXXRecordExcel();
				try {
					DateConverter converter = new DateConverter(null);
					converter.setPattern("yyyy-MM-dd");
					ConvertUtils.register(converter, java.util.Date.class);
					BeanUtils.copyProperties(excel, item);
				} catch (Exception e) {
					// TODO Auto-generated catch block
					log.error(e.getMessage());
				}
				rows.add(excel);
			});
		}
		// 输出excel 文件
		downloadExcel(response, XXXRecordExcel.class, rows);

	   
	}
	
	private void downloadExcel(HttpServletResponse response, Class clazz,
			List data) throws IOException {
		OutputStream out = response.getOutputStream();
		ExcelWriter writer = EasyExcelFactory.getWriter(out);
		Sheet sheet = new Sheet(1, 0, clazz);
		writer.write(data, sheet);
		writer.finish();
		out.flush();
	}