1. 导入jdbc包

java要连接MySQL数据库需要用到JDBC工具(mysql-connector-java-5.1.39-bin.jar)，这是一个jar包，不同的数据库对应不同的jar包，这里用的是MySQL数据库jar包，导入很简单，鼠标对项目右击 - Build Path - Configure Build Path - 右侧选Libraries - Add External JARs,选择正确的jdbc包就行了。

2. 创建数据库(示例: 数据库名studentdb , 表名stable)

3 新建属性及构造方法类(stuInfo.java)

public class stuInfo {

private int sno;

private String sname;

private String sex;

private int age;

public int getSno() {

return sno;

}

public void setSno(int sno) {

this.sno = sno;

}

public String getSname() {

return sname;

}

public void setSname(String sname) {

this.sname = sname;

}

public String getSex() {

return sex;

}

public void setSex(String sex) {

this.sex = sex;

}

public int getAge() {

return age;

}

public void setAge(int age) {

this.age = age;

}

public stuInfo(){

}

public stuInfo(int sno, String sname, String sex, int age) {

this.sno = sno;

this.sname = sname;

this.sex = sex;

this.age = age;

}

}

3. 新建主类(shoeTest.java)

import info.stuInfo;

import java.util.ArrayList;

import java.sql.*;

public class showTest {

public static void main(String[] args) {

ArrayList list = getAllStus();

if(list.size() == 0){

System.out.println("暂无数据");

}else{

for(stuInfo s: list){ //遍历集合数据

System.out.println(s.getSno()+"\t"+s.getSname()+"\t"+s.getSex()+"\t"+s.getAge());

}

}

}

//采用集合的方法，返回数据集合

public static ArrayList getAllStus(){

ArrayList stulist = new ArrayList();

String url = "com.mysql.jdbc.Driver"; //加载驱动包

String connectSql = "jdbc:mysql://127.0.0.1:3306/studentdb"; //链接MySQL数据库

String sqlUser = "root"; //数据库账号

String sqlPasswd = "*****"; //你的数据库密码

Connection con = null;

PreparedStatement psm = null;

ResultSet rs = null;

try {

//加载驱动包

Class.forName(url);

//连接MYSQL

con = DriverManager.getConnection(connectSql,sqlUser,sqlPasswd);

//执行MYSQL语句

psm = con.prepareStatement("select * from stable");

rs = psm.executeQuery();

System.out.println("编号"+"\t"+"姓名"+"\t"+"性别"+"\t"+"年龄");

while(rs.next()){

stuInfo s = new stuInfo();

s.setSno(rs.getInt(1));

s.setSname(rs.getString(2));

s.setSex(rs.getString(3));

s.setAge(rs.getInt(4));

stulist.add(s);

}

//关闭数据库连接

rs.close();

psm.close();

con.close();

} catch (Exception e) {

System.out.println("显示所有数据报错，原因："+e.getMessage());

}

return stulist;

}

}

4. 运行测试