SSM MySql数据导出到Excel

语言：java

框架：SSM

工程：maven

工具类：ExcelUtils.java

工具类下载地址：https://download.csdn.net/download/ledzcl/10234291

备注：本下载地址来源CSDN的dedzcl的博客（链接：https://blog.csdn.net/ledzcl/article/details/79222737）

仅此备忘

一、工具类下载完成后直接放到maven工程里，我放到了util包下

二、pom中添加jar包依赖关系

<!-- https://mvnrepository.com/artifact/org.apache.poi/poi -->
<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi</artifactId>
    <version>3.9</version>
</dependency>

jar包下载地址：https://mvnrepository.com/artifact/org.apache.poi/poi

三、controller层添加requestMapper

@ResponseBody
	@RequestMapping("/allExcel")
	public void AllExcel(HttpServletResponse res) {
		try {
			ServletOutputStream out = res.getOutputStream();
			res.setContentType("application/vnd.ms-excel");
			res.setHeader("Content-disposition", "attachment;filename=" + new SimpleDateFormat("yyyy/MM/dd HH:mm:ss").format(new Date())+URLEncoder.encode("全部", "UTF-8") + ".xls");
			Collection<Object[]> collection=new ArrayList<>();
			//
			List<Mess> allList = mService.getDownloadAll();
//			System.out.println(allList);
			for(Mess mess:allList) {
				Object[] os=new Object[20];
				os[0]=mess.getNumber();
				os[1]=mess.getSname();
				os[2]=mess.getIdcard();
				os[3]=mess.getSex();
				os[4]=mess.getBirthdate();
				os[5]=mess.getNation();
				os[6]=mess.getNativeplace();
				os[7]=mess.getHomeadress();
				os[8]=mess.getSgs();
				os[9]=mess.getSgc();
				os[10]=mess.getScadre();
				os[11]=mess.getDsfirst();
				os[12]=mess.getDssecound();
				os[13]=mess.getDsthird();
				os[14]=mess.getPname();
				os[15]=mess.getRelationship();
				os[16]=mess.getUnit();
				os[17]=mess.getDuty();
				os[18]=mess.getPhonenumber();
				os[19]=mess.getPaiwei();
				collection.add(os);
			}
			//
			String[] columnNames=new String[] {
				"编号","姓名","身份证号","性别","出身日期","民族","户口所在地","家庭住址","毕业学校","毕业班级",
				"曾任课表明","第一心仪学校","第二心仪学校","第三心仪学校","家长姓名","与学生关系","单位","职务","联系方式","是否参加派位"
			};
			int[] columnIndexs=new int[] {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19};
			ExcelUtils.export(collection, "全部学生", columnNames, columnIndexs, 100, out);
			out.flush();
			out.close();
		}catch(Exception e) {
			e.printStackTrace();
		}
	}

解释：

（1）调用工具类中的ExcelUtils.export();便可完成Excel的生成及下载

（2）HttpServletResponse须要设置content type为res.setContentType("application/vnd.ms-excel");

（3）防止中文乱码URLEncoder.encode("全部", "UTF-8")

（4）Collection<Object[]>故须要把service层返回的list转成object放入到Collection<Object[]>中

（5）columnNames和columnIndexs及Collection<Object[]>中的Object[]三者为一一对应关系

（6）最后别忘了out.flush();和out.close();

结束...