SpringBoot匯入匯出資料實現方法詳解

2022-12-03 14:01:21

今天給大家帶來的是一個 SpringBoot匯入匯出資料

首先我們先建立專案注意：建立SpringBoot專案時一定要聯網不然會報錯

專案建立好後我們首先對 application.yml 進行編譯

server:
port: 8081
# mysql
spring:
datasource:
driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://127.0.0.1:3306/dvd?characterEncoding=utf-8&&severTimezone=utc
username: root
password: root
thymeleaf:
mode: HTML5
cache: false
suffix: .html
prefix: classpath:/
mybatis:
mapperLocations: classpath:mapper/**/*.xml
configuration:
map-underscore-to-camel-case: true
pagehelper:
helper-dialect: mysql
offset-as-page-num: true
params: count=countSql
reasonable: true
row-bounds-with-count: true
support-methods-arguments: true

注意：在：後一定要空格，這是他的語法，不空格就會執行報錯

接下來我們進行對專案的構建建立好如下幾個包可根據自己實際需要建立其他的工具包之類的

mapper：用於存放dao層介面

pojo：用於存放實體類

service：用於存放service層介面，以及service層實現類

controller：用於存放controller控制層

接下來我們開始編寫程式碼

首先是實體類

package com.bdqn.springbootexcel.pojo;
import lombok.Data;
import java.io.Serializable;
import java.util.List;
@Data
public class ExcelData implements Serializable{
    //檔名稱
    private String fileName;
    //表頭資料
    private String[] head;
    //資料
    private List<String[]> data;
}

然後是service層

package com.bdqn.springbootexcel.service;
import com.bdqn.springbootexcel.pojo.User;
import org.apache.ibatis.annotations.Select;
import javax.servlet.http.HttpServletResponse;
import java.util.List;
public interface ExcelService {
    Boolean exportExcel(HttpServletResponse response, String fileName, Integer pageNum, Integer pageSize);
    Boolean importExcel(String fileName);
    List<User> find();
}

package com.bdqn.springbootexcel.service;
import com.bdqn.springbootexcel.mapper.UserMapper;
import com.bdqn.springbootexcel.pojo.ExcelData;
import com.bdqn.springbootexcel.pojo.User;
import com.bdqn.springbootexcel.util.ExcelUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import javax.servlet.http.HttpServletResponse;
import java.util.ArrayList;
import java.util.List;
@Slf4j
@Service
public class ExcelServiceImpl implements ExcelService {
    @Autowired
    private UserMapper userMapper;
    @Override
    public Boolean exportExcel(HttpServletResponse response, String fileName, Integer pageNum, Integer pageSize) {
        log.info("匯出資料開始。。。。。。");
        //查詢資料並賦值給ExcelData
        List<User> userList = userMapper.find();
        List<String[]> list = new ArrayList<String[]>();
        for (User user : userList) {
            String[] arrs = new String[userList.size()];
            arrs[0] = String.valueOf(user.getId());
            arrs[1] = String.valueOf(user.getName());
            arrs[2] = String.valueOf(user.getAge());
            arrs[3] = String.valueOf(user.getSex());
            list.add(arrs);
        }
        //表頭賦值
        String[] head = {"序列", "名字", "年齡", "性別"};
        ExcelData data = new ExcelData();
        data.setHead(head);
        data.setData(list);
        data.setFileName(fileName);
        //實現匯出
        try {
            ExcelUtil.exportExcel(response, data);
            log.info("匯出資料結束。。。。。。");
            return true;
        } catch (Exception e) {
            log.info("匯出資料失敗。。。。。。");
            return false;
        }
    }
    @Override
    public Boolean importExcel(String fileName) {
        log.info("匯入資料開始。。。。。。");
        try {
            List<Object[]> list = ExcelUtil.importExcel(fileName);
            System.out.println(list.toString());
            for (int i = 0; i < list.size(); i++) {
                User user = new User();
                user.setName((String) list.get(i)[0]);
                user.setAge((String) list.get(i)[1]);
                user.setSex((String) list.get(i)[2]);
                userMapper.add(user);
            }
            log.info("匯入資料結束。。。。。。");
            return true;
        } catch (Exception e) {
            log.info("匯入資料失敗。。。。。。");
            e.printStackTrace();
        }
        return false;
    }
    @Override
    public List<User> find() {
        return userMapper.find();
    }
}

工具類

package com.bdqn.springbootexcel.util;
import com.bdqn.springbootexcel.pojo.ExcelData;
import com.bdqn.springbootexcel.pojo.User;
import lombok.extern.slf4j.Slf4j;
import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.ss.usermodel.*;
import javax.servlet.http.HttpServletResponse;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
import static org.apache.poi.ss.usermodel.CellType.*;
@Slf4j
public class ExcelUtil {
    public static void exportExcel(HttpServletResponse response, ExcelData data) {
        log.info("匯出解析開始，fileName:{}",data.getFileName());
        try {
            //範例化HSSFWorkbook
            HSSFWorkbook workbook = new HSSFWorkbook();
            //建立一個Excel表單，引數為sheet的名字
            HSSFSheet sheet = workbook.createSheet("sheet");
            //設定表頭
            setTitle(workbook, sheet, data.getHead());
            //設定單元格並賦值
            setData(sheet, data.getData());
            //設定瀏覽器下載
            setBrowser(response, workbook, data.getFileName());
            log.info("匯出解析成功!");
        } catch (Exception e) {
            log.info("匯出解析失敗!");
            e.printStackTrace();
        }
    }
    private static void setTitle(HSSFWorkbook workbook, HSSFSheet sheet, String[] str) {
        try {
            HSSFRow row = sheet.createRow(0);
            //設定列寬，setColumnWidth的第二個引數要乘以256，這個引數的單位是1/256個字元寬度
            for (int i = 0; i <= str.length; i++) {
                sheet.setColumnWidth(i, 15 * 256);
            }
            //設定為居中加粗,格式化時間格式
            HSSFCellStyle style = workbook.createCellStyle();
            HSSFFont font = workbook.createFont();
            font.setBold(true);
            style.setFont(font);
            style.setDataFormat(HSSFDataFormat.getBuiltinFormat("m/d/yy h:mm"));
            //建立表頭名稱
            HSSFCell cell;
            for (int j = 0; j < str.length; j++) {
                cell = row.createCell(j);
                cell.setCellValue(str[j]);
                cell.setCellStyle(style);
            }
        } catch (Exception e) {
            log.info("匯出時設定表頭失敗！");
            e.printStackTrace();
        }
    }
    private static void setData(HSSFSheet sheet, List<String[]> data) {
        try{
            int rowNum = 1;
            for (int i = 0; i < data.size(); i++) {
                HSSFRow row = sheet.createRow(rowNum);
                for (int j = 0; j < data.get(i).length; j++) {
                    row.createCell(j).setCellValue(data.get(i)[j]);
                }
                rowNum++;
            }
            log.info("表格賦值成功！");
        }catch (Exception e){
            log.info("表格賦值失敗！");
            e.printStackTrace();
        }
    }
    private static void setBrowser(HttpServletResponse response, HSSFWorkbook workbook, String fileName) {
        try {
            //清空response
            response.reset();
            //設定response的Header
            response.addHeader("Content-Disposition", "attachment;filename=" + fileName);
            OutputStream os = new BufferedOutputStream(response.getOutputStream());
            response.setContentType("application/vnd.ms-excel;charset=gb2312");
            //將excel寫入到輸出流中
            workbook.write(os);
            os.flush();
            os.close();
            log.info("設定瀏覽器下載成功！");
        } catch (Exception e) {
            log.info("設定瀏覽器下載失敗！");
            e.printStackTrace();
        }
    }
    public static List<Object[]> importExcel(String fileName) {
        log.info("匯入解析開始，fileName:{}",fileName);
        try {
            List<Object[]> list = new ArrayList<>();
            InputStream inputStream = new FileInputStream(fileName);
            Workbook workbook = WorkbookFactory.create(inputStream);
            Sheet sheet = workbook.getSheetAt(0);
            //獲取sheet的行數
            int rows = sheet.getPhysicalNumberOfRows();
            for (int i = 0; i < rows; i++) {
                //過濾表頭行
                if (i == 0) {
                    continue;
                }
                //獲取當前行的資料
                Row row = sheet.getRow(i);
                Object[] objects = new Object[row.getPhysicalNumberOfCells()];
                int index = 0;
                for (Cell cell : row) {
                    if (cell.getCellType().equals(NUMERIC)) {
                        objects[index] = (int) cell.getNumericCellValue();
                    }
                    if (cell.getCellType().equals(STRING)) {
                        objects[index] = cell.getStringCellValue();
                    }
                    if (cell.getCellType().equals(BOOLEAN)) {
                        objects[index] = cell.getBooleanCellValue();
                    }
                    if (cell.getCellType().equals(ERROR)) {
                        objects[index] = cell.getErrorCellValue();
                    }
                    index++;
                }
                list.add(objects);
            }
            log.info("匯入檔案解析成功！");
            return list;
        }catch (Exception e){
            log.info("匯入檔案解析失敗！");
            e.printStackTrace();
        }
        return null;
    }
    //測試匯入
    public static void main(String[] args) {
        try {
            String fileName = "G:/test.xlsx";
            List<Object[]> list = importExcel(fileName);
            for (int i = 0; i < list.size(); i++) {
                User user = new User();
                user.setName((String) list.get(i)[0]);
                user.setAge((String) list.get(i)[1]);
                user.setSex((String) list.get(i)[2]);
                System.out.println(user.toString());
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

最後是controller層

package com.bdqn.springbootexcel.controller;
import com.bdqn.springbootexcel.pojo.User;
import com.bdqn.springbootexcel.service.ExcelService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
import javax.servlet.http.HttpServletResponse;
import java.util.List;
@Slf4j
@RestController
public class ExcelController {
    @Autowired
    private ExcelService excelService;
    @GetMapping("/export")
    public String exportExcel(HttpServletResponse response, String fileName, Integer pageNum, Integer pageSize) {
        fileName = "test.xlsx";
        if (fileName == null || "".equals(fileName)) {
            return "檔名不能為空！";
        } else {
            if (fileName.endsWith("xls") || fileName.endsWith("xlsx")) {
                Boolean isOk = excelService.exportExcel(response, fileName, 1, 10);
                if (isOk) {
                    return "匯出成功！";
                } else {
                    return "匯出失敗！";
                }
            }
            return "檔案格式有誤！";
        }
    }
    @GetMapping("/import")
    public String importExcel(String fileName) {
        fileName = "G:/test.xlsx";
        if (fileName == null && "".equals(fileName)) {
            return "檔名不能為空！";
        } else {
            if (fileName.endsWith("xls") || fileName.endsWith("xlsx")) {
                Boolean isOk = excelService.importExcel(fileName);
                if (isOk) {
                    return "匯入成功！";
                } else {
                    return "匯入失敗！";
                }
            }
            return "檔案格式錯誤！";
        }
    }
    //餅狀圖的資料查詢
    //@ResponseBody
    @RequestMapping("/pojos_bing")
    public List<User> gotoIndex() {
        List<User> pojos = excelService.find();
        return pojos;
    }
}

到現在為止我們的後端程式碼就已經完全搞定了，前端頁面如下

寫了一個簡單前端用於測試

index.html

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <div align="center">
        <a th:href="@{'/export'}" rel="external nofollow" >匯出</a>
        <a th:href="@{'/import'}" rel="external nofollow" >匯入</a>
    </div>
</body>
</html>

當我們點選匯出按鈕時瀏覽器會自動下載

當我們點選匯入按鈕時會往資料庫中新增表格資料

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SpringBoot匯入匯出資料實現方法詳解

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