添加依赖 pom.xml
<!-- 导出表格依赖 -->
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.13</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>3.13</version>
</dependency>
<!-- mybatis-plus依赖 -->
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>3.1.1</version>
</dependency>
<!-- 数据库连接依赖 -->
<dependency>
<groupId>com.sdsvs.finsvc</groupId>
<artifactId>mysql-connector</artifactId>
<version>1.1</version>
</dependency>
<!-- lombok依赖 -->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
配置文件配置 application.yml
#端口号
server:
port: 8080
##数据库的配置信息
spring:
datasource:
url: jdbc:mysql://localhost:3306/user?serverTimezone=UTC&?useUnicode=true&characterEncoding=utf8 #自己的 数据库 名称
username: root
password: root
driver-class-name: com.mysql.jdbc.Driver
mybatis:
#开启驼峰命名法
configuration:
map-underscore-to-camel-case: true
mybatis-plus:
# xml地址
mapper-locations: classpath:mapper/*Mapper.xml
# 实体扫描,多个package用逗号或者分号分隔
type-aliases-package: com.niuben.entity #自己的实体类地址
configuration:
# 这个配置会将执行的sql打印出来,在开发或测试的时候可以用
log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
Excel工具类 ExcelUtils
package com.niuben.utils;
import com.niuben.model.ExcelData;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFCellStyle;
import org.apache.poi.xssf.usermodel.XSSFColor;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.apache.poi.xssf.usermodel.extensions.XSSFCellBorder.BorderSide;
import javax.servlet.http.HttpServletResponse;
import java.awt.Color;
import java.io.OutputStream;
import java.net.URLEncoder;
import java.util.List;
/**
* @author: NiuBen
* @date: Created in 2019/12/15 19:48
* @description:
*/
public class ExcelUtils {
/**
* 使用浏览器选择路径下载
* @param response
* @param fileName
* @param data
* @throws Exception
*/
public static void exportExcel(HttpServletResponse response, String fileName, ExcelData data) throws Exception {
// 告诉浏览器用什么软件可以打开此文件
response.setHeader("content-Type", "application/vnd.ms-excel");
// 下载文件的默认名称
response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName + ".xlsx", "utf-8"));
exportExcel(data, response.getOutputStream());
}
private static int exportExcel(ExcelData data, OutputStream out) throws Exception {
XSSFWorkbook wb = new XSSFWorkbook();
int rowIndex = 0;
try {
String sheetName = data.getName();
if (null == sheetName) {
sheetName = "Sheet1";
}
XSSFSheet sheet = wb.createSheet(sheetName);
rowIndex = writeExcel(wb, sheet, data);
wb.write(out);
} catch (Exception e) {
e.printStackTrace();
} finally {
//此处需要关闭 wb 变量
out.close();
}
return rowIndex;
}
/**
* 表显示字段
* @param wb
* @param sheet
* @param data
* @return
*/
private static int writeExcel(XSSFWorkbook wb, Sheet sheet, ExcelData data) {
int rowIndex = 0;
rowIndex = writeTitlesToExcel(wb, sheet, data.getTitles());
rowIndex = writeRowsToExcel(wb, sheet, data.getRows(), rowIndex);
autoSizeColumns(sheet, data.getTitles().size() + 1);
return rowIndex;
}
/**
* 设置表头
*
* @param wb
* @param sheet
* @param titles
* @return
*/
private static int writeTitlesToExcel(XSSFWorkbook wb, Sheet sheet, List<String> titles) {
int rowIndex = 0;
int colIndex = 0;
Font titleFont = wb.createFont();
//设置字体
titleFont.setFontName("simsun");
//设置粗体
titleFont.setBoldweight(Short.MAX_VALUE);
//设置字号
titleFont.setFontHeightInPoints((short) 14);
//设置颜色
titleFont.setColor(IndexedColors.BLACK.index);
XSSFCellStyle titleStyle = wb.createCellStyle();
//水平居中
titleStyle.setAlignment(XSSFCellStyle.ALIGN_CENTER);
//垂直居中
titleStyle.setVerticalAlignment(XSSFCellStyle.VERTICAL_CENTER);
//设置图案颜色
titleStyle.setFillForegroundColor(new XSSFColor(new Color(182, 184, 192)));
//设置图案样式
titleStyle.setFillPattern(XSSFCellStyle.SOLID_FOREGROUND);
titleStyle.setFont(titleFont);
setBorder(titleStyle, BorderStyle.THIN, new XSSFColor(new Color(0, 0, 0)));
Row titleRow = sheet.createRow(rowIndex);
titleRow.setHeightInPoints(25);
colIndex = 0;
for (String field : titles) {
Cell cell = titleRow.createCell(colIndex);
cell.setCellValue(field);
cell.setCellStyle(titleStyle);
colIndex++;
}
rowIndex++;
return rowIndex;
}
/**
* 设置内容
*
* @param wb
* @param sheet
* @param rows
* @param rowIndex
* @return
*/
private static int writeRowsToExcel(XSSFWorkbook wb, Sheet sheet, List<List<Object>> rows, int rowIndex) {
int colIndex;
Font dataFont = wb.createFont();
dataFont.setFontName("simsun");
dataFont.setFontHeightInPoints((short) 14);
dataFont.setColor(IndexedColors.BLACK.index);
XSSFCellStyle dataStyle = wb.createCellStyle();
dataStyle.setAlignment(XSSFCellStyle.ALIGN_CENTER);
dataStyle.setVerticalAlignment(XSSFCellStyle.VERTICAL_CENTER);
dataStyle.setFont(dataFont);
setBorder(dataStyle, BorderStyle.THIN, new XSSFColor(new Color(0, 0, 0)));
for (List<Object> rowData : rows) {
Row dataRow = sheet.createRow(rowIndex);
dataRow.setHeightInPoints(25);
colIndex = 0;
for (Object cellData : rowData) {
Cell cell = dataRow.createCell(colIndex);
if (cellData != null) {
cell.setCellValue(cellData.toString());
} else {
cell.setCellValue("");
}
cell.setCellStyle(dataStyle);
colIndex++;
}
rowIndex++;
}
return rowIndex;
}
/**
* 自动调整列宽
*
* @param sheet
* @param columnNumber
*/
private static void autoSizeColumns(Sheet sheet, int columnNumber) {
for (int i = 0; i < columnNumber; i++) {
int orgWidth = sheet.getColumnWidth(i);
sheet.autoSizeColumn(i, true);
int newWidth = (int) (sheet.getColumnWidth(i) + 100);
if (newWidth > orgWidth) {
sheet.setColumnWidth(i, newWidth);
} else {
sheet.setColumnWidth(i, orgWidth);
}
}
}
/**
* 设置边框
*
* @param style
* @param border
* @param color
*/
private static void setBorder(XSSFCellStyle style, BorderStyle border, XSSFColor color) {
style.setBorderTop(border);
style.setBorderLeft(border);
style.setBorderRight(border);
style.setBorderBottom(border);
style.setBorderColor(BorderSide.TOP, color);
style.setBorderColor(BorderSide.LEFT, color);
style.setBorderColor(BorderSide.RIGHT, color);
style.setBorderColor(BorderSide.BOTTOM, color);
}
}
创建实体类 UserInfo
package com.niuben.entity;
import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.Data;
import lombok.EqualsAndHashCode;
import lombok.experimental.Accessors;
/**
* @author: NiuBen
* @date: Created in 2019/12/15 19:59
* @description:
*/
@Data
@EqualsAndHashCode(callSuper = false)
@Accessors(chain = true)
@TableName(value = "userInfo")
public class UserInfo {
@TableId(value = "ID", type = IdType.AUTO)
private Integer id;
@TableField("userName")
private String userName;
@TableField("password")
private String password;
}
创建mapper层 UserInfoMapper
package com.niuben.mapper;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.niuben.entity.UserInfo;
import org.apache.ibatis.annotations.Mapper;
@Mapper
public interface UserInfoMapper extends BaseMapper<UserInfo> {
}
在rescurces下创建 mapper/UserInfoMapper.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.niuben.mapper.UserInfo">
</mapper>
创建service层 UserInfoService
package com.niuben.service;
import com.baomidou.mybatisplus.extension.service.IService;
import com.niuben.entity.UserInfo;
public interface UserInfoService extends IService<UserInfo> {
}
创建Impl层 UserInfoServiceImpl
package com.niuben.service.impl;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.niuben.entity.UserInfo;
import com.niuben.mapper.UserInfoMapper;
import com.niuben.service.UserInfoService;
import org.springframework.stereotype.Service;
/**
* @author: NiuBen
* @date: Created in 2019/12/15 20:05
* @description:
*/
@Service
public class UserInfoServiceImpl extends ServiceImpl<UserInfoMapper,UserInfo> implements UserInfoService {
}
创建表格model封装表格数据 ExcelData
package com.niuben.model;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import java.io.Serializable;
import java.util.List;
/**
* @author: NiuBen
* @date: Created in 2019/12/15 19:47
* @description:
*/
@Data
@AllArgsConstructor
@NoArgsConstructor
public class ExcelData implements Serializable {
private static final long serialVersionUID = 6133772627258154184L;
/**
* 表头
*/
private List<String> titles;
/**
* 数据
*/
private List<List<Object>> rows;
/**
* 页签名称
*/
private String name;
}
创建controller层 ExcelController
package com.niuben.controller;
import com.niuben.entity.UserInfo;
import com.niuben.model.ExcelData;
import com.niuben.service.impl.UserInfoServiceImpl;
import com.niuben.utils.ExcelUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import javax.servlet.http.HttpServletResponse;
import java.util.ArrayList;
import java.util.List;
/**
* @author: NiuBen
* @date: Created in 2019/12/15 19:51
* @description:
*/
@Controller
@RequestMapping("/excel")
public class ExcelController {
@Autowired
UserInfoServiceImpl userInfoService;
@RequestMapping("/exportExcel")
public void test2(HttpServletResponse response){
List<UserInfo> list = userInfoService.list();
ExcelData data = new ExcelData();
// 设置sheet页名
data.setName("hello");
List<String> titles = new ArrayList();
titles.add("ID");
titles.add("用户名");
titles.add("密码");
data.setTitles(titles);
List<List<Object>> rows = new ArrayList();
for(int i = 0, length = list.size();i<length;i++){
UserInfo userInfo = list.get(i);
List<Object> row = new ArrayList();
row.add(userInfo.getId());
row.add(userInfo.getUserName());
row.add(userInfo.getPassword());
rows.add(row);
}
data.setRows(rows);
try{
ExcelUtils.exportExcel(response,"表格名称",data);
}catch (Exception e){
e.printStackTrace();
}
}
}