在实际项目开发中,对于Excel的导入导出还是很常见的需求,比如说将数据根据模板批量导入到数据库中,以及将数据库中的数据批量导出陈Excel的形式
现有需求: 根据检索条件查询列表并将结果导出到excel
Easypoi文档:https://easypoi.mydoc.io/#text_186900
EasyPoi的主要特点
1.设计精巧,使用简单
2.接口丰富,扩展简单
3.默认值多,write less do more
4.spring mvc支持,web导出可以简单明了
实现过程
1.创建一个Spring Boot项目
快速生成链接:start.spring.io
2.引入EasyPoi的pom依赖
<!--EasyPoi导入导出-->
<dependency>
<groupId>cn.afterturn</groupId>
<artifactId>easypoi-base</artifactId>
<version>4.3.0</version>
</dependency>
<dependency>
<groupId>cn.afterturn</groupId>
<artifactId>easypoi-web</artifactId>
<version>4.3.0</version>
</dependency>
<dependency>
<groupId>cn.afterturn</groupId>
<artifactId>easypoi-annotation</artifactId>
<version>4.3.0</version>
</dependency>
- easypoi-base 导入导出的工具包,可以完成Excel导出,导入,Word的导出,Excel的导出功能
- easypoi-web 耦合了spring-mvc 基于AbstractView,极大的简化spring-mvc下的导出功能
- easypoi-annotation 基础注解包,作用与实体对象上,拆分后方便maven多工程的依赖管理
sax 导入使用xercesImpl这个包(这个包可能造成奇怪的问题哈),word导出使用poi-scratchpad,都作为可选包了
pom.xml中的所有依赖:
<dependencies>
<!-- 导入web支持:SpringMVC开发支持,Servlet相关的程序 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!-- mybatis相关的依赖 -->
<!--mybatis-plus自动的维护了mybatis以及mybatis-spring的依赖,
在springboot中这三者不能同时的出现,避免版本的冲突,表示:跳进过这个坑-->
<!--mybatis-plus-->
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>3.4.3</version>
</dependency>
<!--mysql驱动-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<!-- alibaba的druid数据库连接池 -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.20</version>
</dependency>
<!-- alibaba的druid数据库连接池 -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>1.1.20</version>
</dependency>
<!--swagger2依赖-->
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger2</artifactId>
<version>2.9.2</version>
<!--排除自身的依赖1.5.20版本-->
<exclusions>
<exclusion>
<groupId>io.swagger</groupId>
<artifactId>swagger-models</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger-ui</artifactId>
<version>2.9.2</version>
</dependency>
<!--此版本解决 example="" 造成的 空字符串""无法转成Number 问题-->
<dependency>
<groupId>io.swagger</groupId>
<artifactId>swagger-models</artifactId>
<version>1.5.21</version>
</dependency>
<!--EasyPoi导入导出-->
<dependency>
<groupId>cn.afterturn</groupId>
<artifactId>easypoi-base</artifactId>
<version>4.3.0</version>
</dependency>
<dependency>
<groupId>cn.afterturn</groupId>
<artifactId>easypoi-web</artifactId>
<version>4.3.0</version>
</dependency>
<dependency>
<groupId>cn.afterturn</groupId>
<artifactId>easypoi-annotation</artifactId>
<version>4.3.0</version>
</dependency>
<!--fastjson-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.71</version>
</dependency>
</dependencies>
3.编写excel工具类
package com.example.easypoiexceldemo.utils;
import cn.afterturn.easypoi.excel.ExcelExportUtil;
import cn.afterturn.easypoi.excel.entity.ExportParams;
import cn.afterturn.easypoi.excel.entity.enmus.ExcelType;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.ss.usermodel.Workbook;
import org.springframework.beans.BeanUtils;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.net.URLEncoder;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Date;
import java.util.List;
public class ExcelUtils {
public static void exportExcel(HttpServletResponse response, String fileName, Collection<?> list, Class<?> pojoClass) throws IOException {
if (StringUtils.isBlank(fileName)) {
//当前日期
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
fileName = df.format(new Date());
}
Workbook workbook = ExcelExportUtil.exportExcel(new ExportParams(fileName, fileName, ExcelType.HSSF), pojoClass, list);
response.setCharacterEncoding("UTF-8");
response.setHeader("content-Type", "application/vnd.ms-excel");
response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8") + ".xls");
ServletOutputStream out = response.getOutputStream();
workbook.write(out);
out.flush();
}
public static void exportExcelToTarget(HttpServletResponse response, String fileName, Collection<?> sourceList, Class<?> targetClass) throws Exception {
List targetList = new ArrayList<>(sourceList.size());
for (Object source : sourceList) {
Object target = targetClass.newInstance();
BeanUtils.copyProperties(source, target);
targetList.add(target);
}
exportExcel(response, fileName, targetList, targetClass);
}
public static void exportExcel(HttpServletResponse response, String title, String sheetName, String fileName, Collection<?> list, Class<?> pojoClass) throws IOException {
if (StringUtils.isBlank(fileName)) {
//当前日期
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
fileName = df.format(new Date());
}
Workbook workbook = ExcelExportUtil.exportExcel(new ExportParams(title, sheetName, ExcelType.HSSF), pojoClass, list);
response.setCharacterEncoding("UTF-8");
response.setHeader("content-Type", "application/vnd.ms-excel");
response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8") + ".xls");
ServletOutputStream out = response.getOutputStream();
workbook.write(out);
out.flush();
}
}
4.在实体类上加注解@Excel
我这边使用了lombok。getter setter和构造方法通过注解 @Data @AllArgsConstructor进行添加,不使用lombok也可手动添加。
要导出的数据可在实体类对应属性上方加**@Excel()注解
**。可定义导出列的名称、宽度,以及性别可区分化(一般数据库中存储的性别为1和2),日期格式化等等。
package com.example.easypoiexceldemo.excel;
import cn.afterturn.easypoi.excel.annotation.Excel;
import lombok.Data;
import java.util.Date;
@Data
public class ProductExcel {
@Excel(name = "商品id")
private Integer product_id;
@Excel(name="商品")
private String title;
@Excel(name="商品副")
private String sub_title;
@Excel(name="商品售价")
private Double sale_price;
@Excel(name="创建者")
private Integer create_by;
@Excel(name="创建时间", format = "yyyy-MM-dd")
private Date create_time;
@Excel(name="修改时间", format = "yyyy-MM-dd")
private Date update_time;
@Excel(name="修改者id")
private Integer update_by;
}
@Excel 作用到filed上面,是对Excel一列的一个描述
@Excel 的属性介绍:
5.Controller
@GetMapping("/excel")
@ApiOperation("根据检索条件查询列表,导出excel")
public void export( HttpServletResponse response) throws IOException {
//根据条件检索列表
QueryWrapper<Product> queryWrapper = new QueryWrapper();
//根据条件检索商品列表
List<Map<String, Object>> list = productService.selectList(queryWrapper);
//将List<Map<String, Object>>结果集转换成List<ProductExcel>
List<ProductExcel> productList = MapToEntity.setList(list,ProductExcel.class);
//导出excel
ExcelUtils.exportExcel(response,null,productList, ProductExcel.class);
}
setList方法为工具类,用于将List<Map<String, Object>>结果集转换成List
MapToEntity工具类:
package com.example.easypoiexceldemo.utils;
import org.apache.commons.lang3.StringUtils;
import java.lang.reflect.Field;
import java.math.BigDecimal;
import java.text.ParseException;
import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Map;
public class MapToEntity {
public static <T> List<T> setList(final List<Map<String, Object>> srcList, Class<T> clazz) {
List<T> list = new ArrayList<>();
for (int i=0;i<srcList.size();i++){
try {
T t = clazz.newInstance();
Field[] fields = t.getClass().getDeclaredFields();
for (Field field : fields) {
if (!"serialVersionUID".equals(field.getName())) {
//设置对象的访问权限,保证对private的属性的访问
field.setAccessible(true);
//读取配置转换字段名,并从map中取出数据
Object v = srcList.get(i).get(field.getName());
field.set(t, convert(v, field.getType()));
}
}
list.add(t);
} catch (Exception ex) {
ex.toString();
}
};
return list;
}
private static <T> T convert(Object obj, Class<T> type) throws ParseException {
if (obj != null && StringUtils.isNotBlank(obj.toString())) {
if (type.equals(String.class)) {
return (T) obj.toString();
} else if (type.equals(BigDecimal.class)) {
return (T) new BigDecimal(obj.toString());
}else if(type.equals(Double.class)){
return (T) Double.valueOf(obj.toString());
}else if(type.equals(Integer.class)){
return (T) Integer.valueOf(obj.toString());
}else if(type.equals(Date.class)){
if(obj!=null){
String timeStr = String.valueOf(obj);
String s[] = timeStr.split("T");
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
return (T) sdf.parse(s[0]+" "+s[1]);
}else{
return null;
}
}
else{
//其他类型转换
return (T) obj.toString();
}
}
return null;
}
}
6.启动项目,进行测试
项目启动成功后,在浏览器中输入 http://localhost:8083/product/excel,进行访问:
打开导出的excel文档:
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