poi小案例

一：pom

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

	<modelVersion>4.0.0</modelVersion>

	<parent>

		<groupId>org.springframework.boot</groupId>

		<artifactId>spring-boot-starter-parent</artifactId>

		<version>2.1.4.RELEASE</version>

		<relativePath/> <!-- lookup parent from repository -->

	</parent>

	<groupId>com.cykj</groupId>

	<artifactId>ycappdemo</artifactId>

	<version>0.0.1-SNAPSHOT</version>

	<name>ycappdemo</name>

	<description>Demo project for Spring Boot</description>

	<properties>

		<java.version>1.8</java.version>

	</properties>

	<dependencies>

		<!--引入web场景-->

		<dependency>

			<groupId>org.springframework.boot</groupId>

			<artifactId>spring-boot-starter-web</artifactId>

		</dependency>

		<!--springboot的jdbc场景启动器-->

		<dependency>

			<groupId>org.springframework.boot</groupId>

			<artifactId>spring-boot-starter-jdbc</artifactId>

		</dependency>

		<!--springboot的mybatis启动器-->

		<dependency>

			<groupId>org.mybatis.spring.boot</groupId>

			<artifactId>mybatis-spring-boot-starter</artifactId>

			<version>2.0.1</version>

		</dependency>

		<!--引入mysql的jar包-->

		<dependency>

			<groupId>mysql</groupId>

			<artifactId>mysql-connector-java</artifactId>

			<version>5.1.30</version>

			<scope>runtime</scope>

		</dependency>

		<!--引入jstl标签库-->

		<dependency>

			<groupId>javax.servlet</groupId>

			<artifactId>jstl</artifactId>

		</dependency>

		<!--添加jsp依赖-->

		<dependency>

			<groupId>org.apache.tomcat.embed</groupId>

			<artifactId>tomcat-embed-jasper</artifactId>

		</dependency>

		<!--引入lombok依赖-->

		<dependency>

			<groupId>org.projectlombok</groupId>

			<artifactId>lombok</artifactId>

			<version>1.16.18</version>

		</dependency>

		<!--热部署-->

		<dependency>

			<groupId>org.springframework.boot</groupId>

			<artifactId>spring-boot-devtools</artifactId>

			<optional>true</optional>

			<scope>true</scope>

		</dependency>

		<!--POI-->

		<dependency>

			<groupId>org.apache.poi</groupId>

			<artifactId>poi</artifactId>

			<version>3.16</version>

		</dependency>

		<dependency>

			<groupId>org.apache.poi</groupId>

			<artifactId>poi-ooxml</artifactId>

			<version>3.14</version>

		</dependency>

		<!--文件上传-->

		<dependency>

			<groupId>commons-fileupload</groupId>

			<artifactId>commons-fileupload</artifactId>

			<version>1.3.1</version>

		</dependency>

		<dependency>

			<groupId>commons-io</groupId>

			<artifactId>commons-io</artifactId>

			<version>2.4</version>

		</dependency>

		<!--springboot的test场景-->

		<dependency>

			<groupId>org.springframework.boot</groupId>

			<artifactId>spring-boot-starter-test</artifactId>

			<scope>test</scope>

		</dependency>

	</dependencies>

	<build>

		<plugins>

			<plugin>

				<groupId>org.springframework.boot</groupId>

				<artifactId>spring-boot-maven-plugin</artifactId>

			</plugin>

		</plugins>

	</build>

</project>

二：application.yml

spring:

  datasource:

    url: jdbc:mysql://127.0.0.1:3306/ycapp

    username: root

    password: root

    driver-class-name: com.mysql.jdbc.Driver

三：application.properties

# 配置默认前缀

spring.mvc.view.prefix=/WEB-INF/view/

# 配置默认后缀

spring.mvc.view.suffix=.jsp

# 对xml中实体对象引用的配置

mybatis.type-aliases-package=com.cykj.ycappdemo.domain

# 指定xml路径，xml在resources目录的位置

mybatis.mapper-locations=classpath:mybatis/*.xml

# mybatis的核心配置文件路径

#mybatis.config-location=

四：domain

package com.cykj.ycappdemo.domain;

import lombok.*;

import lombok.experimental.Accessors;

import java.io.Serializable;

@NoArgsConstructor

@AllArgsConstructor

@Accessors(chain = true)

public @Data  class Machine implements Serializable{

    private Integer id;

    private String cpu;

    private String memory;

    private String rom;

    private String price_gear;

    private String android_version;

    private String brand;

    private String model;

    public Machine(String cpu, String memory, String rom, String price_gear, String android_version, String brand, String model) {

        this.cpu = cpu;

        this.memory = memory;

        this.rom = rom;

        this.price_gear = price_gear;

        this.android_version = android_version;

        this.brand = brand;

        this.model = model;

    }

    /*public static void main(String[] args) {

        Machine machine = new Machine();

        machine.setCpu("1").setMemory("2").setRom("3").setPrice_gear("4");

        System.out.println(machine);

    }*/

}

五：mapper

package com.cykj.ycappdemo.mapper;

import com.cykj.ycappdemo.domain.Machine;

import java.util.List;

public interface MachineMapper {

    public List<Machine> findAllMachine();

    public Boolean addMachine(Machine machine);

//    public Boolean updateMachine(Machine machine);

}

六：mapper.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.cykj.ycappdemo.mapper.MachineMapper">

    <select id="findAllMachine" parameterType="Machine" resultType="Machine">

        SELECT id,cpu,memory,rom,price_gear,android_version,brand,model

        FROM machine_evaluation

    </select>

    <insert id="addMachine" parameterType="machine">

        INSERT INTO machine_evaluation(cpu,memory,rom,price_gear,android_version,brand,model)

        VALUES (#{cpu},#{memory},#{rom},#{price_gear},#{android_version},#{brand},#{model})

    </insert>

    <!--<update id="updateMachine" parameterType="machine">

        UPDATE machine_evaluation SET

    </update>-->

</mapper>

七：service

package com.cykj.ycappdemo.service;

import com.cykj.ycappdemo.domain.Machine;

import org.springframework.web.multipart.MultipartFile;

import javax.crypto.Mac;

import java.util.List;

public interface MachineService {

    public List<Machine> findAll();

    public Boolean add(Machine machine);

    public Boolean batchImport(String fileName, MultipartFile file) throws Exception;

//    public Boolean update(Machine machines);

}

八：serviceImpl

package com.cykj.ycappdemo.service.impl;

import com.cykj.ycappdemo.common.MyException;

import com.cykj.ycappdemo.domain.Machine;

import com.cykj.ycappdemo.mapper.MachineMapper;

import com.cykj.ycappdemo.service.MachineService;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;

import org.apache.poi.ss.usermodel.*;

import org.apache.poi.xssf.usermodel.XSSFWorkbook;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Service;

import org.springframework.transaction.annotation.Transactional;

import org.springframework.web.multipart.MultipartFile;

import java.io.InputStream;

import java.util.ArrayList;

import java.util.List;

@Service

public class MachineServiceImpl implements MachineService {

    @Autowired

    private MachineMapper machineMapper;

    @Override

    public List<Machine> findAll() {

        return machineMapper.findAllMachine();

    }

    @Override

    public Boolean add(Machine machine) {

        return machineMapper.addMachine(machine);

    }

    @Transactional(readOnly = false, rollbackFor = Exception.class)

    @Override

    public Boolean batchImport(String fileName, MultipartFile file) throws Exception {

        boolean notNull = false;

        List<Machine> machineList = new ArrayList<>();

        if (!fileName.matches("^.+\\.(?i)(xls)$") && !fileName.matches("^.+\\.(?i)(xlsx)$")) {

            throw new MyException("上传文件格式不正确");

        }

        boolean isExcel2003 = true;

        if (fileName.matches("^.+\\.(?i)(xlsx)$")) {

            isExcel2003 = false;

        }

        InputStream is = file.getInputStream();

        Workbook wb = null;

        if (isExcel2003) {

            wb = new HSSFWorkbook(is);

        } else {

            wb = new XSSFWorkbook(is);

        }

        Sheet sheet = wb.getSheetAt(0);

        if (sheet != null) {

            notNull = true;

        }

        Machine machine;

        for (int r = 2; r <= sheet.getLastRowNum(); r++) {//r = 2 表示从第三行开始循环 如果你的第三行开始是数据

            Row row = sheet.getRow(r);//通过sheet表单对象得到 行对象

            if (row == null) {

                continue;

            }

            //sheet.getLastRowNum() 的值是 10，所以Excel表中的数据至少是10条；不然报错 NullPointerException

            machine = new Machine();

            /*if (row.getCell(0).getCellType() != 1) {//循环时，得到每一行的单元格进行判断

                throw new MyException("导入失败(第" + (r + 1) + "行,用户名请设为文本格式)");

            }*/

            row.getCell(0).setCellType(Cell.CELL_TYPE_STRING);//得到每一行的 第二个单元格的值

            String cpu = row.getCell(0).getStringCellValue();//得到每一行第一个单元格的值

            if (cpu == null || cpu.isEmpty()) {//判断是否为空

                throw new MyException("导入失败(第" + (r + 1) + "行,cpu未填写)");

            }

            row.getCell(1).setCellType(Cell.CELL_TYPE_STRING);//得到每一行的 第二个单元格的值

            String memory = row.getCell(1).getStringCellValue();

            if (memory == null || memory.isEmpty()) {

                throw new MyException("导入失败(第" + (r + 1) + "行,memory未填写)");

            }

            row.getCell(2).setCellType(Cell.CELL_TYPE_STRING);//得到每一行的 第二个单元格的值

            String rom = row.getCell(2).getStringCellValue();

            if (rom == null || rom.isEmpty()) {

                throw new MyException("导入失败(第" + (r + 1) + "行,rom未填写)");

            }

            row.getCell(3).setCellType(Cell.CELL_TYPE_STRING);//得到每一行的 第二个单元格的值

            String price_gear = row.getCell(3).getStringCellValue();

            if (price_gear == null || price_gear.isEmpty()) {

                throw new MyException("导入失败(第" + (r + 1) + "行,price_gear未填写)");

            }

            row.getCell(4).setCellType(Cell.CELL_TYPE_STRING);//得到每一行的 第二个单元格的值

            String android_version = row.getCell(4).getStringCellValue();

            if (android_version == null || android_version.isEmpty()) {

                throw new MyException("导入失败(第" + (r + 1) + "行,android_version未填写)");

            }

            row.getCell(5).setCellType(Cell.CELL_TYPE_STRING);//得到每一行的 第二个单元格的值

            String brand = row.getCell(5).getStringCellValue();

            if (brand == null || brand.isEmpty()) {

                throw new MyException("导入失败(第" + (r + 1) + "行,brand未填写)");

            }

            String model;

            if(row.getCell(6) == null){

                model = null;

            }else {

                row.getCell(6).setCellType(Cell.CELL_TYPE_STRING);//得到每一行的 第二个单元格的值

                model = row.getCell(6).getStringCellValue();

            }

            /*if (model == null || model.isEmpty()) {

                throw new MyException("导入失败(第" + (r + 1) + "行,model未填写)");

            }*/

            //完整的循环一次 就组成了一个对象

            machine.setCpu(cpu).setMemory(memory).setRom(rom).setPrice_gear(price_gear)

                    .setAndroid_version(android_version).setBrand(brand).setModel(model);

            machineList.add(machine);

        }

        for (Machine machineResord : machineList) {

            machineMapper.addMachine(machineResord);

            /*String name = machineResord.getUsername();

            int cnt = userMapper.selectByName(name);

            if (cnt == 0) {

                userMapper.addUser(userResord);

                System.out.println(" 插入 "+userResord);

            } else {

                userMapper.updateUserByName(userResord);

                System.out.println(" 更新 "+userResord);

            }*/

        }

        return notNull;

    }

}

九：controller

package com.cykj.ycappdemo.controller;

import com.cykj.ycappdemo.domain.Machine;

import com.cykj.ycappdemo.service.MachineService;

import org.apache.poi.hssf.usermodel.HSSFRow;

import org.apache.poi.hssf.usermodel.HSSFSheet;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;

import org.apache.poi.ss.util.CellRangeAddress;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestParam;

import org.springframework.web.bind.annotation.ResponseBody;

import org.springframework.web.bind.annotation.RestController;

import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

import java.io.IOException;

import java.io.OutputStream;

import java.util.ArrayList;

import java.util.List;

@Controller

public class PoiController {

    @Autowired

    private MachineService machineService;

    @RequestMapping(value = "/import")

    public String exImport(@RequestParam(value = "filename")MultipartFile file, HttpSession session) {

        boolean a = false;

        String fileName = file.getOriginalFilename();

        try {

            a = machineService.batchImport(fileName, file);

        } catch (Exception e) {

            e.printStackTrace();

        }

        return "redirect:index";

    }

    @RequestMapping(value = "/export")

    @ResponseBody

    public void export(HttpServletResponse response) throws IOException {

        List<Machine> machineList = machineService.findAll();

        HSSFWorkbook wb = new HSSFWorkbook();

        HSSFSheet sheet = wb.createSheet("machine数据");

        HSSFRow row = null;

        row = sheet.createRow(0);//创建第一个单元格

        row.setHeight((short) (26.25 * 20));

        row.createCell(0).setCellValue("整机评测数据列表");//为第一行单元格设值

        /*为标题设计空间

         * firstRow从第1行开始

         * lastRow从第0行结束

         *

         *从第1个单元格开始

         * 从第3个单元格结束

         */

        CellRangeAddress rowRegion = new CellRangeAddress(0, 0, 0, 6);

        sheet.addMergedRegion(rowRegion);

		/*CellRangeAddress columnRegion = new CellRangeAddress(1,4,0,0);

		sheet.addMergedRegion(columnRegion);*/

        /*

         * 动态获取数据库列 sql语句 select COLUMN_NAME from INFORMATION_SCHEMA.Columns where table_name='user' and table_schema='test'

         * 第一个table_name 表名字

         * 第二个table_name 数据库名称

         * */

        row = sheet.createRow(1);

        row.setHeight((short) (22.50 * 20));//设置行高

        row.createCell(0).setCellValue("cpu");//为第一个单元格设值

        row.createCell(1).setCellValue("memory");//为第二个单元格设值

        row.createCell(2).setCellValue("rom");//为第三个单元格设值

        row.createCell(3).setCellValue("price_gear");//为第三个单元格设值

        row.createCell(4).setCellValue("android_version");//为第三个单元格设值

        row.createCell(5).setCellValue("brand");//为第三个单元格设值

        row.createCell(6).setCellValue("model");//为第三个单元格设值

        for (int i = 0; i < machineList.size(); i++) {

            row = sheet.createRow(i + 2);

            Machine machine = machineList.get(i);

            row.createCell(0).setCellValue(machine.getCpu());

            row.createCell(1).setCellValue(machine.getMemory());

            row.createCell(2).setCellValue(machine.getRom());

            row.createCell(3).setCellValue(machine.getPrice_gear());

            row.createCell(4).setCellValue(machine.getAndroid_version());

            row.createCell(5).setCellValue(machine.getBrand());

            row.createCell(6).setCellValue(machine.getModel());

        }

        sheet.setDefaultRowHeight((short) (16.5 * 20));

        //列宽自适应

        for (int i = 0; i <= 13; i++) {

            sheet.autoSizeColumn(i);

        }

        response.setContentType("application/vnd.ms-excel;charset=utf-8");

        OutputStream os = response.getOutputStream();

        response.setHeader("Content-disposition", "attachment;filename=user.xls");//默认Excel名称

        wb.write(os);

        os.flush();

        os.close();

    }

}

package com.cykj.ycappdemo.controller;

import com.cykj.ycappdemo.domain.Machine;

import com.cykj.ycappdemo.service.MachineService;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Controller;

import org.springframework.ui.Model;

import org.springframework.web.bind.annotation.RequestMapping;

import java.util.List;

@Controller

public class IndexController {

    @Autowired

    private MachineService machineService;

    @RequestMapping("/index")

    public String index(Model model){

        List<Machine> machineList = machineService.findAll();

        model.addAttribute("machineList",machineList);

        return "index";

    }

}

config

package com.cykj.ycappdemo.config;

import org.springframework.beans.factory.annotation.Configurable;

import org.springframework.context.annotation.Bean;

import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;

import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

@Configurable

public class MyWebMvcConfig implements WebMvcConfigurer{

    //  所有的WebMvcConfigurer组件都会一起起作用

    @Bean

    public WebMvcConfigurer webMvcConfigurer(){

        WebMvcConfigurer configurer = new WebMvcConfigurer() {

            @Override

            public void addViewControllers(ViewControllerRegistry registry) {

                registry.addViewController("/").setViewName("index");

            }

        };

        return configurer;

    }

}

myexception

package com.cykj.ycappdemo.common;

public class MyException extends RuntimeException{

    private static final long serialVersionUID = 1L;

    /**

     * 错误编码

     */

    private String errorCode;

    /**

     * 消息是否为属性文件中的Key

     */

    private boolean propertiesKey = true;

    /**

     * 构造一个基本异常.

     *

     * @param message

     *            信息描述

     */

    public MyException(String message)

    {

        super(message);

    }

    /**

     * 构造一个基本异常.

     *

     * @param errorCode

     *            错误编码

     * @param message

     *            信息描述

     */

    public MyException(String errorCode, String message)

    {

        this(errorCode, message, true);

    }

    /**

     * 构造一个基本异常.

     *

     * @param errorCode

     *            错误编码

     * @param message

     *            信息描述

     */

    public MyException(String errorCode, String message, Throwable cause)

    {

        this(errorCode, message, cause, true);

    }

    /**

     * 构造一个基本异常.

     *

     * @param errorCode

     *            错误编码

     * @param message

     *            信息描述

     * @param propertiesKey

     *            消息是否为属性文件中的Key

     */

    public MyException(String errorCode, String message, boolean propertiesKey)

    {

        super(message);

        this.setErrorCode(errorCode);

        this.setPropertiesKey(propertiesKey);

    }

    /**

     * 构造一个基本异常.

     *

     * @param errorCode

     *            错误编码

     * @param message

     *            信息描述

     */

    public MyException(String errorCode, String message, Throwable cause, boolean propertiesKey)

    {

        super(message, cause);

        this.setErrorCode(errorCode);

        this.setPropertiesKey(propertiesKey);

    }

    /**

     * 构造一个基本异常.

     *

     * @param message

     *            信息描述

     * @param cause

     *            根异常类（可以存入任何异常）

     */

    public MyException(String message, Throwable cause)

    {

        super(message, cause);

    }

    public String getErrorCode()

    {

        return errorCode;

    }

    public void setErrorCode(String errorCode)

    {

        this.errorCode = errorCode;

    }

    public boolean isPropertiesKey()

    {

        return propertiesKey;

    }

    public void setPropertiesKey(boolean propertiesKey)

    {

        this.propertiesKey = propertiesKey;

    }

}

<%--

  Created by IntelliJ IDEA.

  User: ligong.zhang

  Date: 2019/4/28

  Time: 15:59

  To change this template use File | Settings | File Templates.

--%>

<%@ page contentType="text/html;charset=UTF-8" language="java" %>

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<html>

<head>

    <title>云测app性能看板主页</title>

    <%-- 支持移动设备优先 --%>

    <meta name="viewport" content="width=device-width, initial-scale=1">

    <%-- 引入css样式 --%>

    <link rel="stylesheet" type="text/css" href="bootstrap/css/bootstrap.min.css">

    <%-- 引入jquery文件 --%>

    <script type="text/javascript" src="bootstrap/js/jquery-1.11.0.min.js"></script>

    <%-- 引入bootstrap.js文件之前必须先引入jquery文件 --%>

    <script type="text/javascript" src="bootstrap/js/bootstrap.js"></script>

</head>

<body>

    <script type="text/javascript">

        alert();

    </script>

    <div class="container">

        <br/><br/>

        <form class="form-inline" id="form_table" action="/import" enctype="multipart/form-data" method="post">

            <div class="form-group">

                <a href="/export" class="btn btn-info">导出</a>

            </div>&nbsp;&nbsp;&nbsp;

            <div class="form-group">

                <input type="submit" class="btn btn-success" value="导入"/>

            </div>

            <div class="form-group">

                <input type="file" class="btn btn-default" name="filename"/>

            </div>

        </form>

        <div class="table-responsive">

              <table class="table table-hover table-striped table-condensed">

                  <thead>

                      <tr>

                          <th>ID</th>

                          <th>CPU</th>

                          <th>MEMORY</th>

                          <th>ROM</th>

                          <th>价格档位</th>

                          <th>安卓版本</th>

                          <th>品牌</th>

                          <th>机型</th>

                      </tr>

                  </thead>

                  <tbody>

                      <c:forEach var="machine" items="${machineList}">

                          <tr >

                              <td>${machine.id}</td>

                              <td class="danger">${machine.cpu}</td>

                              <td>${machine.memory}</td>

                              <td class="warning">${machine.rom}</td>

                              <td >${machine.price_gear}</td>

                              <td class="success">${machine.android_version}</td>

                              <td >${machine.brand}</td>

                              <td class="info">${machine.model}</td>

                          </tr>

                      </c:forEach> &gt;&gt;

                  </tbody>

              </table>

        </div>

    </div>

</body>

</html>

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poi小案例

一：pom

二：application.yml

三：application.properties

四：domain

五：mapper

六：mapper.xml

七：service

八：serviceImpl

九：controller

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