java将数据库里的数据导出到excel（转）

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

 <dependency>
     <groupId>org.apache.poigroupId>
     <artifactId>poiartifactId>
     <version>3.8version>
     <exclusions>
         <exclusion>
             <artifactId>commons-codecartifactId>
             <groupId>commons-codecgroupId>
         exclusion>
     exclusions>
 dependency>
 <dependency>
     <groupId>org.apache.poigroupId>
     <artifactId>poi-ooxmlartifactId>
     <version>3.8version>
 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

 <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

 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)

 /**
  * @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

 /**
  * @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 userlList = userService.getUserForExcel(user);
         ExportExcel ee= new ExportExcel();
         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

 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 getUserDeviceForExcel(User user);

 }

6,service实现层代码

 /**
  * @author  李光光(编码小王子)
  * @date 2015年12月29日 下午3:43:08
  * @Email [email protected]
  * @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 getUserDeviceForExcel(User user) {
         List 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

 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 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:

 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>
     <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>

     <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>

     <bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
         <property name="dataSource" ref="dynamicDataSource"/>
     bean>

     <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

   xml version="1.0" encoding="UTF-8"?>
 >
 <mapper namespace="XXX .UserDao">


     <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:

 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   [email protected]
  * @date    2016年7月18日 下午9:03:29
  * @version 1.0
  */
 public class ExportExcel {
     public void exportExcel(String[] headers,Collection 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 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();
             }
         }
     }

 }