最近导入excel出现这个问题，日期格式都是Thu Jan 04 00:00:00 CST 1900，转换为日期都从1900年开始。从网上找到了答案，特此记录：
先贴出关键代码：
本来日期是这么取得
输出为：Thu Jan 04 00:00:00 CST 1900这种格式
存入数据库为：
现在改为
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
输出为：Mon Dec 31 00:00:00 CST 2018这种格式，
存入数据库为 
下面为我测试的完整代码，用mybatis测试入库的
其中有两个，一个导入一个导出，入口为info.lumanman.poi.main下的两个类ExportExcel：导出，ImportExcel：导入
pom.xml jar包依赖
<!-- mybatis包 -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.4.6</version>
</dependency>
<!-- mysql驱动包 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.39</version>
</dependency>
<!--poi包 -->
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml-schemas</artifactId>
<version>3.10-FINAL</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>3.10-FINAL</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.10-FINAL</version>
</dependency>目录结构
文件从上而下：
package info.lumanman.poi.dao;
import java.util.List;
import info.lumanman.poi.po.Student;
public interface StudentDao {
int addStudent(List<Student> studentList);
Student getStudentList();
}
package info.lumanman.poi.main;
import java.io.InputStream;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import info.lumanman.poi.po.Student;
import info.lumanman.poi.util.ExportExcelUtil;
import info.lumanman.poi.util.ImportExcelUtil;
public class ExportExcel {
public static void main(String[] args) throws Exception {
String resource="mybatis-config.xml";
InputStream inputStream=Resources.getResourceAsStream(resource);
//加载mybatis-config.xml配置文件，并创建SqlSessionFactory对象
SqlSessionFactory sessionFactory=new SqlSessionFactoryBuilder().build(inputStream);
//创建sqlSession对象
SqlSession session=sessionFactory.openSession();
try {
//执行selece语句，将resultSet映射成对象并返回
List<Student> studentList=session.selectList("info.lumanman.poi.dao.StudentDao.getStudentList");
ExportExcelUtil.exportTwo(studentList);
//输出Blog对象
System.out.println(studentList);
}finally {
session.close();
}
}
}
package info.lumanman.poi.main;
import java.io.InputStream;
import java.text.SimpleDateFormat;
import java.util.Date;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import info.lumanman.poi.po.Student;
import info.lumanman.poi.util.ImportExcelUtil;
public class ImportExcel {
public static void main(String[] args) throws Exception {
String resource="mybatis-config.xml";
InputStream inputStream=Resources.getResourceAsStream(resource);
//加载mybatis-config.xml配置文件，并创建SqlSessionFactory对象
SqlSessionFactory sessionFactory=new SqlSessionFactoryBuilder().build(inputStream);
//创建sqlSession对象
SqlSession session=sessionFactory.openSession();
try {
//执行selece语句，将resultSet映射成对象并返回
int result=session.insert("info.lumanman.poi.dao.StudentDao.addStudent",ImportExcelUtil.getStudentList() );
session.commit();
//输出Blog对象
System.out.println(result);
}finally {
session.close();
}
}
}
package info.lumanman.poi.po;
import java.util.Date;
public class Student {
private int id;
private String name;
private int age;
private Date createDate;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public Date getCreateDate() {
return createDate;
}
public void setCreateDate(Date createDate) {
this.createDate = createDate;
}
}
package info.lumanman.poi.util;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.List;
import org.apache.poi.hssf.usermodel.HSSFDataFormat;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.DataFormat;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.usermodel.WorkbookFactory;
import info.lumanman.poi.po.Student;
public class ExportExcelUtil {
/**
* 读取Excel测试，兼容 Excel 2003/2007/2010
* @throws Exception
*/
public static void addStudentList(List<Student> studentList) throws Exception {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
try {
// 同时支持Excel 2003、2007
File excelFile = new File("C:\\Users\\WM\\Desktop\\student-export.xlsx"); // 创建文件对象
if(!excelFile.exists()){
excelFile.createNewFile();
}
FileInputStream in = new FileInputStream(excelFile); // 文件流
ImportExcelUtil.checkExcelVaild(excelFile);
//Workbook workbook = ImportExcelUtil.getWorkbok(in,excelFile);
Workbook workbook = WorkbookFactory.create(in); // 这种方式 Excel2003/2007/2010都是可以处理的
Sheet sheet = workbook.createSheet("工作簿1"); // 遍历第三个Sheet
sheet.getRow(0).getCell(0).setCellValue("姓名");
sheet.getRow(0).getCell(1).setCellValue("年龄");
sheet.getRow(0).getCell(2).setCellValue("创建时间");
for(int i=1;i<studentList.size();i++){//出去目录:遍历行
sheet.getRow(i).getCell(0).setCellValue(studentList.get(i-1).getName());
sheet.getRow(i).getCell(0).setCellValue(studentList.get(i-1).getAge());
sheet.getRow(i).getCell(0).setCellValue(studentList.get(i-1).getCreateDate());
}
} catch (Exception e) {
e.printStackTrace();
}
}
public static void exportTwo(List<Student> studentList) throws Exception{
// create a new file
FileOutputStream out = new FileOutputStream("C:\\Users\\WM\\Desktop\\student-export.xlsx");
// create a new workbook
Workbook wb = new HSSFWorkbook();
// create a new sheet
Sheet sheet = wb.createSheet();
// declare a row object reference
Row row = null;
// declare a cell object reference
wb.setSheetName(0, "学生基本信息" );
Cell cell=null;
//设置表头
row = sheet.createRow(0);
sheet.setColumnWidth(0, 10000);
sheet.setColumnWidth(1, 3000);
sheet.setColumnWidth(2, 4000);
CellStyle cellStyle = wb.createCellStyle();
cellStyle.setAlignment(CellStyle.ALIGN_CENTER); // 居中
cell = row.createCell(0);
cell.setCellStyle(cellStyle);
cell.setCellValue("姓名");
cell = row.createCell(1);
cell.setCellStyle(cellStyle);
cell.setCellValue("年龄");
cell = row.createCell(2);
cell.setCellStyle(cellStyle);
cell.setCellValue("创建时间");
SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
for (int rownum =1; rownum < studentList.size(); rownum++){
row = sheet.createRow(rownum);//从第二行开始创建
cell = row.createCell(0);
cell.setCellValue(studentList.get(rownum-1).getName());
cell = row.createCell(1);
cell.setCellValue(studentList.get(rownum-1).getAge());
cell = row.createCell(2);
cell.setCellValue(sdf.format(studentList.get(rownum-1).getCreateDate()));
}
wb.write(out);
out.close();
}
}
package info.lumanman.poi.util;
/**
*
*/
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.List;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import info.lumanman.poi.po.Student;
/**
*
* Description: Excel操作
*
* CreateTime: 2017年12月11日 下午3:08:09
*
* Change History:
*
* Date CR Number Name Description of change
*
*/
public class ImportExcelUtil {
private static final String EXCEL_XLS = "xls";
private static final String EXCEL_XLSX = "xlsx";
/**
* 判断Excel的版本,获取Workbook
* @param in
* @param filename
* @return
* @throws IOException
*/
public static Workbook getWorkbok(InputStream in,File file) throws IOException{
Workbook wb = null;
if(file.getName().endsWith(EXCEL_XLS)){ //Excel 2003
wb = new HSSFWorkbook(in);
}else if(file.getName().endsWith(EXCEL_XLSX)){ // Excel 2007/2010
wb = new XSSFWorkbook(in);
}
return wb;
}
/**
* 判断文件是否是excel
* @throws Exception
*/
public static void checkExcelVaild(File file) throws Exception{
if(!file.exists()){
throw new Exception("文件不存在");
}
if(!(file.isFile() && (file.getName().endsWith(EXCEL_XLS) || file.getName().endsWith(EXCEL_XLSX)))){
throw new Exception("文件不是Excel");
}
}
/**
* 读取Excel测试，兼容 Excel 2003/2007/2010
* @throws Exception
*/
public static List<Student> getStudentList() throws Exception {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
try {
// 同时支持Excel 2003、2007
File excelFile = new File("C:\\Users\\WM\\Desktop\\student.xlsx"); // 创建文件对象
FileInputStream in = new FileInputStream(excelFile); // 文件流
checkExcelVaild(excelFile);
Workbook workbook = getWorkbok(in,excelFile);
//Workbook workbook = WorkbookFactory.create(is); // 这种方式 Excel2003/2007/2010都是可以处理的
Sheet sheet = workbook.getSheetAt(0); // 遍历第三个Sheet
//获取总行数
// System.out.println(sheet.getLastRowNum());
List<Student> studentList=new ArrayList<Student>();
for(int i=1;i<sheet.getLastRowNum();i++){//出去目录:遍历行
Student student=new Student();
// student.setName((String)getValue(sheet.getRow(i).getCell(0)));
//
// String ageExcel=String.valueOf((Double)getValue(sheet.getRow(i).getCell(1)));
// student.setAge(Integer.parseInt(ageExcel.substring(0,ageExcel.indexOf("."))));
// student.setCreateDate(fmt.parse((String)getValue(sheet.getRow(i).getCell(1))));
sheet.getRow(i).getCell(0).setCellType(Cell.CELL_TYPE_STRING);
student.setName(sheet.getRow(i).getCell(0).getStringCellValue());
sheet.getRow(i).getCell(1).setCellType(Cell.CELL_TYPE_STRING);
student.setAge(Integer.parseInt(sheet.getRow(i).getCell(1).getStringCellValue()));
sheet.getRow(i).getCell(2).setCellType(Cell.CELL_TYPE_STRING);
student.setCreateDate(sdf.parse(sheet.getRow(i).getCell(2).getStringCellValue()));
studentList.add(student);
}
return studentList;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
}
<?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="info.lumanman.poi.dao.StudentDao" >
<!-- 定义sql语句 -->
<select id="getStudentList" resultType="info.lumanman.poi.po.Student">
select name,age,create_date createDate from student
</select>
<insert id="addStudent" parameterType="list" >
insert into student(name,age,create_date)values
<foreach collection="list" item="student" separator="," >
(#{student.name},#{student.age},#{student.createDate})
</foreach>
</insert>
</mapper><?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<settings><!-- 全局配置信息 -->
<setting name="cacheEnabled" value="true" />
<!-- 打印查询语句 -->
<setting name="logImpl" value="STDOUT_LOGGING" />
</settings>
<environments default="development">
<environment id="development">
<!--配置事务管理器的类型 -->
<transactionManager type="JDBC">
</transactionManager>
<!-- 配置数据源的类型，以及数据库连接的相关信息 -->
<dataSource type="POOLED">
<property name="driver" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/test"/>
<property name="username" value="root"/>
<property name="password" value="123456"/>
</dataSource>
</environment>
</environments>
<!--配置映射配置文件的位置 -->
<mappers>
<mapper resource="mapper/StudentMapper.xml"/>
</mappers>
</configuration>数据库脚本
DROP TABLE IF EXISTS `student`;
CREATE TABLE `student` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(255) NOT NULL DEFAULT '',
`age` int(11) NOT NULL DEFAULT '0',
`create_date` datetime DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=488 DEFAULT CHARSET=utf8mb4;参考地址：https://blog.csdn.net/wwd0501/article/details/78780646
http://poi.apache.org/components/spreadsheet/quick-guide.html这是官方的文档