package com.test;
import java.sql.*;
public class DBhelper {
Connection conn = null;
ResultSet rs = null;
//连接数据库
public void connect(){
try {
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/w2","root","123456");
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
// e.printStackTrace();
System.out.println("数据库驱动加载失败!");
} catch (SQLException e) {
// TODO Auto-generated catch block
// e.printStackTrace();
System.out.println("数据库连接失败!");
}
}
//查询
public ResultSet Search(String sql, String str[]){
connect();
try {
PreparedStatement pst = conn.prepareStatement(sql);
if(str != null){
for(int i=0;i
}
pst.setInt(str.length, Integer.parseInt(str[str.length-1]));
}
rs = pst.executeQuery();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return rs;
}
//增删修改
public int AddU(String sql, String str[]){
int a =0;
connect();
try {
PreparedStatement pst = conn.prepareStatement(sql);
if(str != null){
for(int i=0;i
}
pst.setInt(str.length, Integer.parseInt(str[str.length-1]));
}
a = pst.executeUpdate();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return a;
}
}
package com.test;
import java.sql.Date;
public class Stu {
private int id;
private String name;
private String dt;
private int hid;
public Stu(int id, String name, String dt, int hid) {
this.id = id;
this.name = name;
this.dt = dt;
this.hid = hid;
}
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 String getDt() {
return dt;
}
public void setDt(String dt) {
this.dt = dt;
}
public int getHid() {
return hid;
}
public void setHid(int hid) {
this.hid = hid;
}
public Stu() {
}
@Override
public String toString() {
return "Stu [id=" + id + ", name=" + name + ", dt=" + dt + ", hid=" + hid + "]";
}
}
package com.test;
import java.io.File;
import java.io.IOException;
import java.sql.Date;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import jxl.Sheet;
import jxl.Workbook;
import jxl.read.biff.BiffException;
//实现Excel导入数据库核心类,读取Excel表中所有的数据,操作数据(查询、更新)
public class StuService {
/**
* 查询数据库中Student表中所有的数据
*/
public static List
List
DBhelper db = new DBhelper();
String sql = "select * from student";
ResultSet rs = db.Search(sql, null);
try {
while(rs.next()){
int id = rs.getInt("id");
String name = rs.getString("name");
String dt = rs.getString("dt");
int hid = rs.getInt("hid");
list.add(new Stu(id,name,dt,hid));
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return list;
}
/**
* 查询指定目录中Excel表格中所有数据
* @param file为文件完整路径
* @return
*/
public static List
List
try {
Workbook rwb = Workbook.getWorkbook(new File(file));
Sheet rs = rwb.getSheet("Test Shee 1"); //或者rwb.getSheet(0)
int clos=rs.getColumns();//得到所有的列
int rows=rs.getRows();//得到所有的行
System.out.println("clos:"+clos+" rows:"+rows);
for(int i=1;i
//第一个是列数,第二个是行数
String id=rs.getCell(j++, i).getContents();//默认最左边编号也算一列 所以这里得j++
String name=rs.getCell(j++, i).getContents();
String dt=rs.getCell(j++, i).getContents();
String hid=rs.getCell(j++, i).getContents();
System.out.println("id:"+id+" name:"+name+" dt:"+dt+" hid:"+hid);
list.add(new Stu(Integer.parseInt(id), name, dt , Integer.parseInt(hid)));
}
} catch (BiffException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return list;
}
/**
* 通过id判断是否存在
* @param id
* @return
*/
public static boolean isExist(int id){
try {
DBhelper db=new DBhelper();
ResultSet rs=db.Search("select * from student where id=?", new String[]{id+""});
if (rs.next()) {
return true;
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return false;
}
public static void main(String[] args) {
/*List
for (Stu stuEntity : all) {
System.out.println(stuEntity.toString());
}*/
System.out.println(isExist(1));
}
}
package com.test;
import java.io.File;
import java.util.List;
import jxl.Workbook;
import jxl.write.Label;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;
public class FromDbToExcel {
public static void main(String[] args) {
try {
WritableWorkbook wwb = null;
// 创建可写入的Excel工作簿
String fileName = "F://test1//student.xls";
File file=new File(fileName);
if (!file.exists()) {
file.createNewFile();
}
//以fileName为文件名来创建一个Workbook
wwb = Workbook.createWorkbook(file);
// 创建工作表
WritableSheet ws = wwb.createSheet("Test Shee 1", 0);
//查询数据库中所有的数据
List
//要插入到的Excel表格的行号,默认从0开始
Label labelId= new Label(0, 0, "编号(id)");//表示第
Label labelName= new Label(1, 0, "姓名(name)");
Label labelSex= new Label(2, 0, "时间(dt)");
Label labelNum= new Label(3, 0, "Hid(hid)");
ws.addCell(labelId);
ws.addCell(labelName);
ws.addCell(labelSex);
ws.addCell(labelNum);
for (int i = 0; i < list.size(); i++) {
Label labelId_i= new Label(0, i+1, list.get(i).getId()+"");
Label labelName_i= new Label(1, i+1, list.get(i).getName());
Label labelDt_i= new Label(2, i+1, list.get(i).getDt());
Label labelHid_i= new Label(3, i+1, list.get(i).getHid()+"");
ws.addCell(labelId_i);
ws.addCell(labelName_i);
ws.addCell(labelDt_i);
ws.addCell(labelHid_i);
}
//写进文档
wwb.write();
// 关闭Excel工作簿对象
System.out.println("数据导出成功!");
wwb.close();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
package com.test;
import java.util.List;
public class FromExcelToDb {
public static void main(String[] args) {
//得到表格中所有的数据
List
/*//得到数据库表中所有的数据
List
DBhelper db=new DBhelper();
for (Stu stuEntity : listExcel) {
int id=stuEntity.getId();
if (!StuService.isExist(id)) {
//不存在就添加
String sql="insert into student (name,dt,hid) values(?,?,?)";
String[] str=new String[]{stuEntity.getName(),stuEntity.getDt(),stuEntity.getHid()+""};
db.AddU(sql, str);
}else {
//存在就更新
String sql="update student set name=?,dt=?,hid=? where id=?";
String[] str=new String[]{stuEntity.getName(),stuEntity.getDt(),stuEntity.getHid()+"",id+""};
db.AddU(sql, str);
}
}
System.out.println("数据更新成功!");
}
}