java|java 登录注册小程序

Blog系统的操作步骤
下面安装包的下载地址
https://pan.baidu.com/s/1cMqDK6
提取码cyqd
首先安装jdk;;;下面这个网址是叫你如何安装jdk
https://jingyan.baidu.com/article/6dad5075d1dc40a123e36ea3.html
安装eclipse下面这个教程是叫你如何安装eclipse
https://jingyan.baidu.com/article/d7130635194f1513fcf47557.html
安装连接数据库的组件
http://www.cnblogs.com/Angella/p/6878632.html
安装mysql
http://www.imooc.com/video/1803

开始〉〉运行输入cmd
输入下面的语句
Mysql –uroot –p –P3306 –h127.0.0.1(-u用户名,我的用户名是root,所以我输入的是-uroot,密码在Enter password那里输入,-P端口号,-h服务器名称,输入好后按enter)

现在就登陆进mysql
创建一个数据库
语句如下:
create database BlogLogin;
use BlogLogin;
create table client
(
account varchar(10) primary key not null,
password varchar(20) not null
);
desc client;



插入数据
写入以下代码:
Insert into client
Values(‘12345’,’a54321’);
Insert into client
Values(‘angella’,’yan771018’);

查看所有用户
Select * from client;

打开eclipse
File>new >java project


我这里命名为blog点击>>finish
右击blog>>new >>package


我这里也是命名为blog>>finish



命名按我这个BlogFrame来,因为如果你命名的跟我的不一样,直接复制代码会发生错误。
〉〉finish

把public class BlogFrame{} 删掉;
把以下代码复制进去

import java.awt.EventQueue;

import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;

publicclass BlogFrame extends JFrame {
/**
* author vicky yan
*/
privatestaticfinallongserialVersionUID = 1L;
String str1 = null;
String str2 = null;

JLabel label1 = new JLabel("用户名:");
JLabel label2 = new JLabel("密码:");
JTextField tf1 = new JTextField(20); // 填写框的长度
JTextField tf2 = new JTextField(20);
// 按钮
JButton bt1 = new JButton("登陆");
JButton bt2 = new JButton("取消");
JButton bt3 = new JButton("注册");

public BlogFrame() {
init();
}

publicvoid init() {
this.setTitle("Blog version 0.1");

this.setBounds(300, 300, DEFULAT_WIDTH, DEFULAT_HEIGHT);

bt1.addActionListener(new ActionListener() {
publicvoid actionPerformed(ActionEvent e) {
str1 = tf1.getText();
str2 = tf2.getText();
new BlogDB().check(str1, str2);
tf1.setText("");
tf2.setText("");
}
});

bt2.addActionListener(new ActionListener() {
publicvoid actionPerformed(ActionEvent e) {
System.exit(0);
}
});
bt3.addActionListener(new ActionListener() {
publicvoid actionPerformed(ActionEvent e) {
str1 = tf1.getText();
str2 = tf2.getText();
new BlogDB().addAccount(str1, str2);
【java|java 登录注册小程序】
tf1.setText("");
tf2.setText("");
}
});

JPanel p1 = new JPanel();
JPanel p2 = new JPanel();
JPanel p3 = new JPanel();
p1.add(label1);
p1.add(tf1);
p2.add(label2);
p2.add(tf2);
p3.add(bt1);
p3.add(bt2);
p3.add(bt3);

this.setLayout(new GridLayout(3, 1));
this.add(p1);
this.add(p2);
this.add(p3);
this.pack();
}

publicstaticvoid main(String[] args) {

EventQueue.invokeLater(new Runnable() {
publicvoid run() {
JFrame frame = new BlogFrame();
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
});
}

privatestaticfinalintDEFULAT_WIDTH = 150;
privatestaticfinalintDEFULAT_HEIGHT = 80;
}

class BlogDB {
Connection conn = null;
PreparedStatement ps = null;
Statement stmt = null;
ResultSet res = null;
String str1 = null;
String str2 = null;
String url = "jdbc:mysql://localhost:3306/BlogLogin?user=root&password=root";

// 连接数据库的url,BlogLogin是我自己的一个数据库.//输入你自己的用户名和密码我的用户名和密码都是root
public BlogDB() {
init();
}

publicvoid init() {
try {
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection(url);
System.out.println("恭喜你,你已经成功连接数据库*——*");
} catch (SQLException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
}

// 把从文本框里面取的值传进来和数据库里面的对比
publicvoid check(String st1, String st2) {
this.str1 = st1;
this.str2 = st2;
try {
// 当用户名= 在client表中搜索密码是否正确
String sql = "selectpasswordfromclientwhere account= '"
+ str1 + "'";
stmt = conn.createStatement(); // 用Statement
res = stmt.executeQuery(sql);
if (res.next()) {// 直接判断有木有结果集
System.out.println("您的账户是存在的。");
if (str2.equals(res.getString("password"))) {
System.out.println("您输入的密码正确!");
} else {
System.out.println("很遗憾,你输入的密码不正确");
}
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
stmt.close();
res.close();
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}

}
}

publicvoid addAccount(String str3, String str4) {
// 插入数据
String sql2 = "insert intoclient(account,password) values(?,?)";
try {
ps = conn.prepareStatement(sql2);
ps.setString(1, str3); // 跟数据库类型相对应
ps.setString(2, str4);
int resultInt = ps.executeUpdate();
if (resultInt >= 0)

System.out.println("您的账号已注册成功哈哈哈^_^"); // 一般不报错就能成功,可以不加判断。
} catch (SQLException e) {
e.printStackTrace();

} finally {
try {
ps.close();
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}

}

}

}
按如图箭头所指的绿色箭头。






。。
Blog系统的操作步骤
下面安装包的下载地址
https://pan.baidu.com/s/1cMqDK6
提取码cyqd
首先安装jdk;;;下面这个网址是叫你如何安装jdk
https://jingyan.baidu.com/article/6dad5075d1dc40a123e36ea3.html
安装eclipse下面这个教程是叫你如何安装eclipse
https://jingyan.baidu.com/article/d7130635194f1513fcf47557.html
安装连接数据库的组件
http://www.cnblogs.com/Angella/p/6878632.html
安装mysql
http://www.imooc.com/video/1803

开始〉〉运行输入cmd
输入下面的语句
Mysql –uroot –p –P3306 –h127.0.0.1(-u用户名,我的用户名是root,所以我输入的是-uroot,密码在Enter password那里输入,-P端口号,-h服务器名称,输入好后按enter)

现在就登陆进mysql
创建一个数据库
语句如下:
create database BlogLogin;
use BlogLogin;
create table client
(
account varchar(10) primary key not null,
password varchar(20) not null
);
desc client;



插入数据
写入以下代码:
Insert into client
Values(‘12345’,’a54321’);
Insert into client
Values(‘angella’,’yan771018’);

查看所有用户
Select * from client;

打开eclipse
File>new >java project


我这里命名为blog点击>>finish
右击blog>>new >>package


我这里也是命名为blog>>finish



命名按我这个BlogFrame来,因为如果你命名的跟我的不一样,直接复制代码会发生错误。
〉〉finish

把public class BlogFrame{} 删掉;
把以下代码复制进去

import java.awt.EventQueue;

import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;

publicclass BlogFrame extends JFrame {
/**
* author vicky yan
*/
privatestaticfinallongserialVersionUID = 1L;
String str1 = null;
String str2 = null;

JLabel label1 = new JLabel("用户名:");
JLabel label2 = new JLabel("密码:");
JTextField tf1 = new JTextField(20); // 填写框的长度
JTextField tf2 = new JTextField(20);
// 按钮
JButton bt1 = new JButton("登陆");
JButton bt2 = new JButton("取消");
JButton bt3 = new JButton("注册");

public BlogFrame() {
init();
}

publicvoid init() {
this.setTitle("Blog version 0.1");

this.setBounds(300, 300, DEFULAT_WIDTH, DEFULAT_HEIGHT);

bt1.addActionListener(new ActionListener() {
publicvoid actionPerformed(ActionEvent e) {
str1 = tf1.getText();
str2 = tf2.getText();
new BlogDB().check(str1, str2);
tf1.setText("");
tf2.setText("");
}
});

bt2.addActionListener(new ActionListener() {
publicvoid actionPerformed(ActionEvent e) {
System.exit(0);
}
});
bt3.addActionListener(new ActionListener() {
publicvoid actionPerformed(ActionEvent e) {
str1 = tf1.getText();
str2 = tf2.getText();
new BlogDB().addAccount(str1, str2);

tf1.setText("");
tf2.setText("");
}
});

JPanel p1 = new JPanel();
JPanel p2 = new JPanel();
JPanel p3 = new JPanel();
p1.add(label1);
p1.add(tf1);
p2.add(label2);
p2.add(tf2);
p3.add(bt1);
p3.add(bt2);
p3.add(bt3);

this.setLayout(new GridLayout(3, 1));
this.add(p1);
this.add(p2);
this.add(p3);
this.pack();
}

publicstaticvoid main(String[] args) {

EventQueue.invokeLater(new Runnable() {
publicvoid run() {
JFrame frame = new BlogFrame();
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
});
}

privatestaticfinalintDEFULAT_WIDTH = 150;
privatestaticfinalintDEFULAT_HEIGHT = 80;
}

class BlogDB {
Connection conn = null;
PreparedStatement ps = null;
Statement stmt = null;
ResultSet res = null;
String str1 = null;
String str2 = null;
String url = "jdbc:mysql://localhost:3306/BlogLogin?user=root&password=root";

// 连接数据库的url,BlogLogin是我自己的一个数据库.//输入你自己的用户名和密码我的用户名和密码都是root
public BlogDB() {
init();
}

publicvoid init() {
try {
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection(url);
System.out.println("恭喜你,你已经成功连接数据库*——*");
} catch (SQLException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
}

// 把从文本框里面取的值传进来和数据库里面的对比
publicvoid check(String st1, String st2) {
this.str1 = st1;
this.str2 = st2;
try {
// 当用户名= 在client表中搜索密码是否正确
String sql = "selectpasswordfromclientwhere account= '"
+ str1 + "'";
stmt = conn.createStatement(); // 用Statement
res = stmt.executeQuery(sql);
if (res.next()) {// 直接判断有木有结果集
System.out.println("您的账户是存在的。");
if (str2.equals(res.getString("password"))) {
System.out.println("您输入的密码正确!");
} else {
System.out.println("很遗憾,你输入的密码不正确");
}
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
stmt.close();
res.close();
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}

}
}

publicvoid addAccount(String str3, String str4) {
// 插入数据
String sql2 = "insert intoclient(account,password) values(?,?)";
try {
ps = conn.prepareStatement(sql2);
ps.setString(1, str3); // 跟数据库类型相对应
ps.setString(2, str4);
int resultInt = ps.executeUpdate();
if (resultInt >= 0)

System.out.println("您的账号已注册成功哈哈哈^_^"); // 一般不报错就能成功,可以不加判断。
} catch (SQLException e) {
e.printStackTrace();

} finally {
try {
ps.close();
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}

}

}

}
按如图箭头所指的绿色箭头。





。。
转载于:https://www.cnblogs.com/Angella/p/6906314.html

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