在本人工作的过程中,遇到了形形色色的问题。当时琢磨了好久才琢磨出这样的总结,贴出来供大家参考参考。以下观点仅代表本人在工作过程中的观点,望大家能够共同讨论,查漏补缺。
由于工作需要,最近公司需要我来通过从数据库中导出表中的数据,然后将数据导出成Excel表格的性格。由于需要作出不同统计的操作,但是却要求导出成一个Excel文档,而不是多个文档。而在网上形形色色的资料中,似乎还没有找到一个Excel文档中导出多张工作表。因此,将我自己写的贴出来让大家参考参考。
首先我们来明确一下需求(表名以及表结构为虚构,大家需要针对自己的需求进行修改):
1、导出Employee表中的数据,其中Employee表中的数据格式为:
Long id
String username;
int sex
int age
String height
String weight
String ts (入职时间)
2、在一个Excel文档中需要统计出两种数据。一种为全部Employee的数据。一种为入职时间在本周的数据
所谓代码未动,jar包先行。我们首先需要的就是导入我们的jar包。
传送门:http://download.csdn.net/detail/a2279860a/9791283
注意:在这里我只提供apache的poi包,就是用于Java操作Excel的所需包,而不提供连接数据库的jar包。因此切勿忘记导入jar包时操作数据库需要导入相关的jar包
那么导入了jar包之后,我们就可以开始写我们的代码了!
首先我们需要定义一个UserinfoData类,用于封装查询到的数据
public class UserinfoData {
private String email;
private int sex;
private String age;
private String height;
private String weight;
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public int getSex() {
return sex;
}
public void setSex(int sex) {
this.sex = sex;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
public String getHeight() {
return height;
}
public void setHeight(String height) {
this.height = height;
}
public String getWeight() {
return weight;
}
public void setWeight(String weight) {
this.weight = weight;
}
}
这里可能就会有人疑惑了,Student表中不是有一个ts字段吗,怎么定义的UserinfoData中没有ts呢?
其实很简单啊,因为这样简单的操作不需要使用到框架那么高大上复杂的东西,使用简单的jdbc就行了,因此不必字段跟表中列相对应的。
创建好了封装对象之后,我们就需要通过查询数据库获取到相应的数据了。
import java.sql.DriverManager;
import java.util.ArrayList;
import java.util.List;
import org.junit.Test;
import com.mysql.jdbc.Connection;
import com.mysql.jdbc.PreparedStatement;
import com.mysql.jdbc.ResultSet;
/**
* 导出数据库中的数据到Excel中
* @author 昆仑山神
*
*/
public class ExportExcelTest_poi {
@Test
public void testExcelExport() throws Exception {
String DRIVER = "com.mysql.jdbc.Driver";
String URL = "jdbc:mysql:///test?useUnicode=true&characterEncoding=UTF-8";
String USERNAME = "xxxx";
String USERPASSWORD = "xxxx";
List oneWeek = DateUtil.getOneWeek();// 获取一周时间
String sqlAll = "SELECT * FROM t_userinfo"; // 查询总用户数据
String sqlWeek = "SELECT * FROM t_userinfo WHERE ts BETWEEN '"+oneWeek.get(0)+"' AND '"+oneWeek.get(6)+ "'"; // 查询本周新增用户数据
// 连接数据库
Class.forName(DRIVER);
//声明对象
Connection conn = null;
PreparedStatement ps = null;
ResultSet rs = null;
PreparedStatement psWeek = null;
ResultSet rsWeek = null;
try {
conn = (Connection) DriverManager.getConnection(URL,USERNAME,USERPASSWORD);
ps = (PreparedStatement) conn.prepareStatement(sqlAll);
rs = (ResultSet) ps.executeQuery();
List userinfoDataList = new ArrayList();
while(rs.next()){
UserinfoData userinfoData = new UserinfoData();
userinfoData.setEmail(rs.getString("username"));
userinfoData.setSex(rs.getInt("sexCode"));
userinfoData.setAge(rs.getString("birthday"));
userinfoData.setHeight(rs.getString("height"));
userinfoData.setWeight(rs.getString("weight"));
userinfoDataList.add(userinfoData);
}
System.out.println(userinfoDataList.size());
psWeek = (PreparedStatement) conn.prepareStatement(sqlWeek);
rsWeek = (ResultSet) psWeek.executeQuery();
List userinfoDataListWeek = new ArrayList();
while(rsWeek.next()){
UserinfoData userinfoData = new UserinfoData();
userinfoData.setEmail(rsWeek.getString("username"));
userinfoData.setSex(rsWeek.getInt("sexCode"));
userinfoData.setAge(rsWeek.getString("birthday"));
userinfoData.setHeight(rsWeek.getString("height"));
userinfoData.setWeight(rsWeek.getString("weight"));
userinfoDataListWeek.add(userinfoData);
}
System.out.println(userinfoDataListWeek.size());
// 导出文件
CreateExcelUtil.createExcel(userinfoDataList, userinfoDataListWeek);
} catch (Exception e) {
e.printStackTrace();
}finally{
//关闭连接
try {
if(rs != null){
rs.close();
}
} catch (Exception e2) {
e2.printStackTrace();
}finally{
try {
if(ps != null){
ps.close();
}
} catch (Exception e3) {
e3.printStackTrace();
}finally{
try {
if(conn != null){
conn.close();
}
} catch (Exception e4) {
e4.printStackTrace();
}
}
}
}
}
}
因为我们需要获取到本周的数据,因此需要对时间进行解析,因此我们额外的写了一个工具类。
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.List;
public class DateUtil {
private static final int FIRST_DAY = Calendar.MONDAY;
public static List getOneWeek(){
List weekList = new ArrayList();
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Calendar calendar = Calendar.getInstance();
setToFirstDay(calendar);
for (int i = 0; i < 7; i++) {
if(i == 0){
calendar.set(Calendar.HOUR_OF_DAY, 0);
calendar.set(Calendar.MINUTE, 0);
calendar.set(Calendar.SECOND, 0);
}else if(i == 6){
calendar.set(Calendar.HOUR_OF_DAY, 23);
calendar.set(Calendar.MINUTE, 59);
calendar.set(Calendar.SECOND, 59);
}
weekList.add(dateFormat.format(calendar.getTime()));
calendar.add(Calendar.DATE, 1);
}
return weekList;
}
private static void setToFirstDay(Calendar calendar) {
while (calendar.get(Calendar.DAY_OF_WEEK) != FIRST_DAY) {
calendar.add(Calendar.DATE, -1);
}
}
}
最后的重头戏就是我们的生成文件的程序了:
import java.io.FileOutputStream;
import java.util.List;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
/**
* 导出数据库中的数据到Excel中
* @author 昆仑山神
*
*/
@SuppressWarnings("deprecation")
public class CreateSimpleExcelToDisk
{
public static boolean createExcel(List userinfoDataListAll, List userinfoDataListWeek) throws Exception{
try {
if(userinfoDataListAll != null && userinfoDataListAll.size() > 0){
// 创建一个webbook,对应一个Excel文件
HSSFWorkbook wb = new HSSFWorkbook();
// 在webbook中添加多个sheet,对应Excel文件中的sheet
HSSFSheet sheetAll = wb.createSheet("总用户表");
// 设置格式,设置表头居中
HSSFCellStyle style = wb.createCellStyle();
style.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 创建一个居中格式
// 在sheet中添加表头第0行,显示总用户数
HSSFRow rowAllHead = sheetAll.createRow((int) 0);
HSSFCell cellAllHead = rowAllHead.createCell((short) 0);
cellAllHead.setCellValue("总用户数: " + userinfoDataListAll.size());
cellAllHead.setCellStyle(style);
//总用户表
HSSFRow rowAll = sheetAll.createRow((int) 1);
HSSFCell cellAll = rowAll.createCell((short) 0);
//设置列名以及格式(与传入的List集合中的对象的字段相一致)
cellAll.setCellValue("邮箱");
cellAll.setCellStyle(style);
cellAll = rowAll.createCell((short) 1);
cellAll.setCellValue("性别");
cellAll.setCellStyle(style);
cellAll = rowAll.createCell((short) 2);
cellAll.setCellValue("年龄");
cellAll.setCellStyle(style);
cellAll = rowAll.createCell((short) 3);
cellAll.setCellValue("身高");
cellAll.setCellStyle(style);
cellAll = rowAll.createCell((short) 4);
cellAll.setCellValue("体重");
cellAll.setCellStyle(style);
// 写入实体数据
for (int i = 0; i < userinfoDataListAll.size(); i++)
{
rowAll = sheetAll.createRow((int) i + 2);
UserinfoData ud = (UserinfoData) userinfoDataListAll.get(i);
// 创建单元格,并设置值
rowAll.createCell((short) 0).setCellValue(ud.getEmail());
rowAll.createCell((short) 1).setCellValue(ud.getSex() == 1 ? "男" : "女");
rowAll.createCell((short) 2).setCellValue(ud.getAge());
rowAll.createCell((short) 3).setCellValue(ud.getHeight());
rowAll.createCell((short) 4).setCellValue(ud.getWeight());
}
//自动调整总用户表列宽
sheetAll.autoSizeColumn((short)0);
sheetAll.autoSizeColumn((short)1);
sheetAll.autoSizeColumn((short)2);
sheetAll.autoSizeColumn((short)3);
sheetAll.autoSizeColumn((short)4);
//本周新增用户表
HSSFSheet sheetWeek = wb.createSheet("本周新增用户表");
// 在sheet中添加表头第0行,显示本周增加用户数
HSSFRow rowWeekHead = sheetWeek.createRow((int) 0);
HSSFCell cellWeekHead = rowWeekHead.createCell((short) 0);
cellWeekHead.setCellValue("本周新增用户数: " + userinfoDataListWeek.size());
cellWeekHead.setCellStyle(style);
HSSFRow rowWeek = sheetWeek.createRow((int) 1);
HSSFCell cellWeek = rowWeek.createCell((short) 0);
//设置列名以及格式(与传入的List集合中的对象的字段相一致)
cellWeek.setCellValue("邮箱");
cellWeek.setCellStyle(style);
cellWeek = rowWeek.createCell((short) 1);
cellWeek.setCellValue("性别");
cellWeek.setCellStyle(style);
cellWeek = rowWeek.createCell((short) 2);
cellWeek.setCellValue("年龄");
cellWeek.setCellStyle(style);
cellWeek = rowWeek.createCell((short) 3);
cellWeek.setCellValue("身高");
cellWeek.setCellStyle(style);
cellWeek = rowWeek.createCell((short) 4);
cellWeek.setCellValue("体重");
cellWeek.setCellStyle(style);
if(userinfoDataListWeek != null && userinfoDataListWeek.size() > 0){
// 写入实体数据
for (int i = 0; i < userinfoDataListWeek.size(); i++)
{
rowWeek = sheetWeek.createRow((int) i + 2);
UserinfoData ud = (UserinfoData) userinfoDataListWeek.get(i);
// 创建单元格,并设置值
rowWeek.createCell((short) 0).setCellValue(ud.getEmail());
rowWeek.createCell((short) 1).setCellValue(ud.getSex() == 1 ? "男" : "女");
rowWeek.createCell((short) 2).setCellValue(ud.getAge());
rowWeek.createCell((short) 3).setCellValue(ud.getHeight());
rowWeek.createCell((short) 4).setCellValue(ud.getWeight());
}
}
//自动调整本周新增用户表列宽
sheetWeek.autoSizeColumn((short)0);
sheetWeek.autoSizeColumn((short)1);
sheetWeek.autoSizeColumn((short)2);
sheetWeek.autoSizeColumn((short)3);
sheetWeek.autoSizeColumn((short)4);
// 将文件存到指定位置
FileOutputStream fout = new FileOutputStream("E:/test.xls");
wb.write(fout);
fout.close();
return true;
}else{
return false;
}
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
}
这样,我们就能够导出相关的数据出来啦!!导出来的文件大致样子是这样滴!
这里写图片描述
这里写图片描述
如果大家还有什么更加简便的方式,欢迎大家在评论区留言!