DBUtil.java
package com.util;
import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;
public class DBUtil {
private static String driver = null;
private static String url = null;
private static String username = null;
private static String password = null;
private static Properties pro = null;
static{
pro = new Properties();
try {
pro.load(DBUtil.class.getClassLoader().getResourceAsStream("db.properties"));
driver = pro.getProperty("db.driver").trim();
url = pro.getProperty("db.url").trim();
username = pro.getProperty("db.username").trim();
password = pro.getProperty("db.password").trim();
} catch (IOException e) {
e.printStackTrace();
}
}
public static Connection getConn(){
try {
Class.forName(driver);
return DriverManager.getConnection(url, username, password);
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}
return null;
}
private static void closeConn(Connection conn) {
closeConn(conn, null, null);
}
public static void closeConn(Connection conn,Statement stm,ResultSet rs){
if(null != conn){
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if(null != stm){
try {
stm.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if(null != rs){
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
public static void main(String[] args){
Connection conn = DBUtil.getConn();
System.out.println(conn);
DBUtil.closeConn(conn);
System.out.println("------over------");
}
}
Province.java
package com.jdbc.entity;
public class Province {
private int id;
private int prov_id;
private String prov_name;
private String prov_type;
private String prov_state;
public Province(int id, int prov_id, String prov_name, String prov_type,
String prov_state) {
super();
this.id = id;
this.prov_id = prov_id;
this.prov_name = prov_name;
this.prov_type = prov_type;
this.prov_state = prov_state;
}
public Province() {
super();
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public int getProv_id() {
return prov_id;
}
public void setProv_id(int prov_id) {
this.prov_id = prov_id;
}
public String getProv_name() {
return prov_name;
}
public void setProv_name(String prov_name) {
this.prov_name = prov_name;
}
public String getProv_type() {
return prov_type;
}
public void setProv_type(String prov_type) {
this.prov_type = prov_type;
}
public String getProv_state() {
return prov_state;
}
public void setProv_state(String prov_state) {
this.prov_state = prov_state;
}
}
MakeExcelProvince
package com.poi.excel;
import java.io.FileOutputStream;
import java.io.IOException;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
import org.apache.poi.hssf.usermodel.HSSFCell;
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.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import com.jdbc.entity.Province;
import com.test.excel.User;
import com.util.DBUtil;
/**
* java to excel 导入appache的poi 3.15 jar 包
*/
public class MakeExcelProvince {
// 产生要储存的集合
protected static List getProvince() throws Exception {
List provinces = new ArrayList();
Connection conn = DBUtil.getConn();
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery("select * from province");
while(rs.next()){
Province province = new Province(rs.getInt(1),rs.getInt(2),rs.getString(3),rs.getString(4),rs.getString(5));
provinces.add(province);
}
return provinces;
}
public static void main(String[] args) throws Exception {
// 第一步，创建一个workbook对应一个excel文件
XSSFWorkbook workbook = new XSSFWorkbook();
// 第二部，在workbook中创建一个sheet对应excel中的sheet
XSSFSheet sheet = workbook.createSheet("省份表");
// 第三部，在sheet表中添加表头第0行，老版本的poi对sheet的行列有限制
XSSFRow row = sheet.createRow(0);
// 第四步，创建单元格，设置表头
XSSFCell cell = row.createCell(0);
cell.setCellValue("id");
cell = row.createCell(1);
cell.setCellValue("prov_id");
cell = row.createCell(2);
cell.setCellValue("prov_name");
cell = row.createCell(3);
cell.setCellValue("prov_type");
cell = row.createCell(4);
cell.setCellValue("prov_state");
// 第五步，写入实体数据，实际应用中这些数据从数据库得到,对象封装数据，集合包对象。对象的属性值对应表的每行的值
List provinces = getProvince();
for (int i = 0; i < provinces.size(); i++) {
XSSFRow row1 = sheet.createRow(i + 1);
Province province = provinces.get(i);
// 创建单元格设值
row1.createCell(0).setCellValue(province.getId());
row1.createCell(1).setCellValue(province.getProv_id());
row1.createCell(2).setCellValue(province.getProv_name());
row1.createCell(3).setCellValue(province.getProv_type());
row1.createCell(4).setCellValue(province.getProv_state());
}
// 将文件保存到指定的位置
try {
FileOutputStream fos = new FileOutputStream("f:\\test4.xlsx");
workbook.write(fos);
System.out.println("写入成功");
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
jdbc properties
#jdbc properties
db.driver=com.mysql.jdbc.Driver
db.url=jdbc:mysql://xxx.xxx.xxx.xxx/test
db.username=xxx
db.password=xxxxx
注：需要修改具体数据库连接配置
jar包地址：https://www.apache.org/dyn/closer.lua/poi/release/bin/poi-bin-3.16-20170419.tar.gz
解压后，将所有文件夹下的jar包都添加到环境变量当中，