java将数据库里的数据导出到excel

项目中很多都会用到将数据导出到excel,然后对数据进行整理分析,在之前的项目中,多处用到此功能,也走了很多弯路,从一开始的tableExcel到现在的poi,从一开始用HSSFWorkbook

再到XSSFWorkbook,一步步优化,废话少说,直接开始.

项目框架

1,后台:spring+springmvc+mybatis

2,前台: bootstrap+jQuery+ajax

3,项目管理:maven

说明.excel处理函数需要引入poi的jar包,在pom.xml引入一下代码

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<!-- POI -->

<dependency>

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

<artifactId>poi</artifactId>

<version>3.8</version>

<exclusions>

<exclusion>

<artifactId>commons-codec</artifactId>

<groupId>commons-codec</groupId>

</exclusion>

</exclusions>

</dependency>

<dependency>

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

<artifactId>poi-ooxml</artifactId>

<version>3.8</version>

</dependency>

别的框架大体上也是可以的,只需稍微调整,如有问题,大家可留言讨论

实现的功能说明:将数据库中的人员信息(姓名.年龄,电话)导出到excel

具体代码如下

1,前台html代码

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<span>

<label>姓名：</label>

<input id="name" placeholder="请输入姓名" type="text">

</span>

<span>

<label>性别：</label>

<select id="sex" style="height: 24px;width: 163px;">

<option value="">请选择性别</option>

<option value="1">男</option>

<option value="2">女</option>

</select>

</span>

<span>

<label>年龄：</label>

<input id="age" placeholder="请输入年龄" type="text">

</span>

<button class="btn" id="deviceExport">导出</button>

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

前台页面效果图



2,js代码

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var User = function(){

this.init = function(){

// 用于导出excel

$("#userExport").click(function() {

var url = '/user/export/';

location.href = url + "?queryJson="+JSON.stringify(user.acquireInquireData());

});

};

//获取查询条件

this.acquireInquireData = function(){

var inquireCondition = {

name:$('#name').val(),//名称

sex: $('#sex').val(),//性别

age: $('#age').val(),//年龄

};

return inquireCondition;

};

}

var user;

$(function(){

user = new User();

user.init();

});

3,domain的user实体类(该实体类如果作为最终导出结果的实体类,则该类的字段必须与需要导出的字段保持一致,且与导出列表的顺序也得保持一致)

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/**

* @author 李光光(编码小王子)

* @QQ 826331692

* @date 2016年11月7日 下午2:57:03

* @version 1.0

*/

public class User {

private String name;

private String sex;

private String age;

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public String getSex() {

return sex;

}

public void setSex(String sex) {

this.sex = sex;

}

public String getAge() {

return age;

}

public void setAge(String age) {

this.age = age;

}

}

4,controller层代码

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/**

* @author 李光光(编码小王子)

* @date 2015年12月29日 下午4:04:00

* @qq 826331692

* @version 1.0

* @return

*/

@Controller

@RequestMapping("/user")

public class UserController {

@Autowired

private UserService userService;

/**

* 用于导出excel的查询结果

* @param queryJson

* @return

*/

@RequestMapping("/export")

public void export(HttpServletRequest request, HttpServletResponse response,

@RequestParam(value = "queryJson") String queryJson) {

User user = JSON.parseObject(queryJson, User.class);

List<User> userlList = userService.getUserForExcel(user);

ExportExcel<User> ee= new ExportExcel<User>();

String[] headers = { "序号", "姓名", "性别", "年龄" };

String fileName = "用户信息表";

ee.exportExcel(headers,userlList,fileName,response);

}

}

5,service层代码

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public interface UserService {

/**

* 根据查询条件查询出所有的记录,不用分页,用于excel导出功能

* @param userDeviceVo

* @return

*/

public List<User> getUserDeviceForExcel(User user);

}

6,service实现层代码

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/**

* @author 李光光(编码小王子)

* @date 2015年12月29日 下午3:43:08

* @Email 826331692@qq.com

* @version 1.0

* @return

*/

@service

public class UserServiceImpl implements UserService {

@Autowired

private UserDao userDao;

/**

* 根据查询条件查询出所有的记录,不用分页,用于excel导出功能

* @param userDeviceVo

* @return

*/

@Override

public List<User> getUserDeviceForExcel(User user) {

List<User> list = userDao.getUserForExcel(user);

Integer order;

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

order = i + 1;

list.get(i).setOrder(order.toString());

if (list.get(i).getSex().equals("1")) {

list.get(i).setSex("男");

} else {

list.get(i).setSex("女");

}

}

return list;

}

}

6dao层代码

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public interface UserDao {

/**

* 根据查询条件查询出所有的记录,不用分页,用于excel导出功能

* @param userDeviceVo

* @return

*/

List<User> getUserForExcel(User user);

}

需要在配置文件中加载UserDao的信息,否则无法找到UserDao,配置如下:

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

<beans xmlns="http://www.springframework.org/schema/beans"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

<bean id="dataSource" destroy-method="close" class="org.apache.commons.dbcp.BasicDataSource">

<property name="driverClassName">

<value>${DB_MSSQL_DRIVER}</value>

</property>

<property name="url">

<value>${DB_MSSQL_URL}</value>

</property>

<property name="username">

<value>${DB_MSSQL_USER}</value>

</property>

<property name="password">

<value>${DB_MSSQL_PW}</value>

</property>

<property name="maxActive">

<value>${maxActive}</value>

</property>

<property name="maxIdle">

<value>${maxIdle}</value>

</property>

<property name="minIdle">

<value>${minIdle}</value>

</property>

<property name="maxWait">

<value>${maxWait}</value>

</property>

<property name="timeBetweenEvictionRunsMillis">

<value>${timeBetweenEvictionRunsMillis}</value>

</property>

<property name="minEvictableIdleTimeMillis">

<value>${minEvictableIdleTimeMillis}</value>

</property>

<property name="testWhileIdle">

<value>${testWhileIdle}</value>

</property>

<property name="testOnReturn" value="true" />

<property name="testOnBorrow" value="true"/>

<property name="validationQuery">

<value>${validationQuery}</value>

</property>

<property name="removeAbandoned">

<value>${removeAbandoned}</value>

</property>

<property name="removeAbandonedTimeout">

<value>${removeAbandonedTimeout}</value>

</property>

</bean><!-- org.mybatis.spring.SqlSessionFactoryBean-->

<bean id="dataSourceCms" destroy-method="close" class="org.apache.commons.dbcp.BasicDataSource">

<property name="driverClassName">

<value>${DB_MSSQL_CMS_DRIVER}</value>

</property>

<property name="url">

<value>${DB_MSSQL_CMS_URL}</value>

</property>

<property name="username">

<value>${DB_MSSQL_CMS_USER}</value>

</property>

<property name="password">

<value>${DB_MSSQL_CMS_PW}</value>

</property>

<property name="maxActive">

<value>${maxActive}</value>

</property>

<property name="maxIdle">

<value>${maxIdle}</value>

</property>

<property name="minIdle">

<value>${minIdle}</value>

</property>

<property name="maxWait">

<value>${maxWait}</value>

</property>

<property name="timeBetweenEvictionRunsMillis">

<value>${timeBetweenEvictionRunsMillis}</value>

</property>

<property name="minEvictableIdleTimeMillis">

<value>${minEvictableIdleTimeMillis}</value>

</property>

<property name="testWhileIdle">

<value>${testWhileIdle}</value>

</property>

<property name="testOnReturn" value="true" />

<property name="testOnBorrow" value="true"/>

<property name="validationQuery">

<value>${validationQuery}</value>

</property>

<property name="removeAbandoned">

<value>${removeAbandoned}</value>

</property>

<property name="removeAbandonedTimeout">

<value>${removeAbandonedTimeout}</value>

</property>

</bean>

<!-- 编写spring 配置文件的配置多数源映射关系 -->

<bean class="com.jd.iapp.utils.DynamicDataSource" id="dynamicDataSource">

<property name="targetDataSources">

<map key-type="java.lang.String">

<entry value-ref="dataSource" key="dataSource"></entry>

<entry value-ref="dataSourceCms" key="dataSourceCms"></entry>

</map>

</property>

<property name="defaultTargetDataSource" ref="dataSource">

</property>

</bean>

<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">

<property name="dataSource" ref="dynamicDataSource" />

<property name="configLocation" value="classpath:spring/sqlMapConfig.xml"></property>

</bean>

<!-- 事务管理器 -->

<bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">

<property name="dataSource" ref="dynamicDataSource"/>

</bean>

<!-- 用户表 -->

<bean id="userDao" class="org.mybatis.spring.mapper.MapperFactoryBean">

<property name="mapperInterface" value="com.jd.xe.web.dao.UserDao" />

<property name="sqlSessionFactory" ref="sqlSessionFactory" />

</bean>

</beans>

7mybatis代码

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<?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="XXX .UserDao">

<!--根据查询条件查询出所有的记录,不用分页,用于excel导出功能 -->

<select id="getUserForExcel" parameterType="User" resultType="User">

select name,sex,age

from juser_table

where 1=1 and

<if test="name != null and name !=''">and name=#{name}</if>

<if test="sex != null and sex !=''">and sex=#{sex}</if>

<if test="age != null and age !=''">and age=#{age}</if>

</select>

</mapper>

8,重头戏来了,将List数据写入到excel的代码如下:

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package com.jd.xe.web.service.userDevice;

import java.io.BufferedOutputStream;

import java.lang.reflect.Field;

import java.lang.reflect.Method;

import java.util.Collection;

import java.util.Date;

import java.util.Iterator;

import javax.servlet.http.HttpServletResponse;

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

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

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

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

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

import com.jd.xe.web.utils.DateUtil;

/**

* @author 李光光(编码小王子)

* @Email 826331692@qq.com

* @date 2016年7月18日 下午9:03:29

* @version 1.0

*/

public class ExportExcel<T> {

public void exportExcel(String[] headers,Collection<T> dataset, String fileName,HttpServletResponse response) {

// 声明一个工作薄

XSSFWorkbook workbook = new XSSFWorkbook();

// 生成一个表格

XSSFSheet sheet = workbook.createSheet(fileName);

// 设置表格默认列宽度为15个字节

sheet.setDefaultColumnWidth((short) 20);

// 产生表格标题行

XSSFRow row = sheet.createRow(0);

for (short i = 0; i < headers.length; i++) {

XSSFCell cell = row.createCell(i);

XSSFRichTextString text = new XSSFRichTextString(headers[i]);

cell.setCellValue(text);

}

try {

// 遍历集合数据，产生数据行

Iterator<T> it = dataset.iterator();

int index = 0;

while (it.hasNext()) {

index++;

row = sheet.createRow(index);

T t = (T) it.next();

// 利用反射，根据javabean属性的先后顺序，动态调用getXxx()方法得到属性值

Field[] fields = t.getClass().getDeclaredFields();

for (short i = 0; i < headers.length; i++) {

XSSFCell cell = row.createCell(i);

Field field = fields[i];

String fieldName = field.getName();

String getMethodName = "get" + fieldName.substring(0, 1).toUpperCase() + fieldName.substring(1);

Class tCls = t.getClass();

Method getMethod = tCls.getMethod(getMethodName, new Class[] {});

Object value = getMethod.invoke(t, new Object[] {});

// 判断值的类型后进行强制类型转换

String textValue = null;

// 其它数据类型都当作字符串简单处理

if(value != null && value != ""){

textValue = value.toString();

}

if (textValue != null) {

XSSFRichTextString richString = new XSSFRichTextString(textValue);

cell.setCellValue(richString);

}

}

}

getExportedFile(workbook, fileName,response);

} catch (Exception e) {

e.printStackTrace();

}

}

/**

*

* 方法说明: 指定路径下生成EXCEL文件

* @return

*/

public void getExportedFile(XSSFWorkbook workbook, String name,HttpServletResponse response) throws Exception {

BufferedOutputStream fos = null;

try {

String fileName = name + ".xlsx";

response.setContentType("application/x-msdownload");

response.setHeader("Content-Disposition", "attachment;filename=" + new String( fileName.getBytes("gb2312"), "ISO8859-1" ));

fos = new BufferedOutputStream(response.getOutputStream());

workbook.write(fos);

} catch (Exception e) {

e.printStackTrace();

} finally {

if (fos != null) {

fos.close();

}

}

}

}

至此整个代码已经完成了,如有什么不明白的地方,可以评论,我会及时回复大家,着急的话也可以QQ:826331692联系我,互相学习,共同进步.