「java校验设计」java数据校验框架

admin 2023-01-12 16:24:06 309

今天给各位分享java校验设计的知识，其中也会对java数据校验框架进行解释，如果能碰巧解决你现在面临的问题，别忘了关注本站，现在开始吧！

本文目录一览：

1、java 方法参数怎么优雅校验
2、JAVA 设计swing登录界面验证用户名密码
3、java后台参数校验，比如是否是汉子、字母、数字的组合，这种校验出了正则表达式，还有别的方法吗？
4、使用Java如何验证所以日期是否正确

java 方法参数怎么优雅校验

建议参考validation框架，比较常用的实现 hibernate-validation，使用@annatation进行声明式校验，并且校验代码可以复用，同时约束应用框架的数据标准。

JAVA 设计swing登录界面验证用户名密码

应用的还是web的啊..

我给你写了个应用的哈

你在C盘建个test.txt文件

里面写

username:用户名（这里可以随便写哈）

password:同上哈

注意是要换行的哦。。

比如

username:tiger

password:tiger

然后你建个Login的类

然后把下面的代码弄进去

运行就是了

注意登陆的时候你文件里面设定的什么用户名和密码就输入什么哈

输入错误就会提示输入错误的

import java.io.BufferedReader;

import java.io.FileReader;

import javax.swing.JFrame;

import javax.swing.JOptionPane;

/**

* @author thinkpad

public class Login extends javax.swing.JFrame {

/** Creates new form Login */

private static String username;

private static String password;

public Login() {

initComponents();

try {

BufferedReader br = new BufferedReader(new FileReader("C:\\test.txt"));

username = br.readLine().split("\\:")[1];

password = br.readLine().split("\\:")[1];

System.out.println(username + password);

} catch(Exception e) {

e.printStackTrace();

}

/** This method is called from within the constructor to

* initialize the form.

* WARNING: Do NOT modify this code. The content of this method is

* always regenerated by the Form Editor.

@SuppressWarnings("unchecked")

// editor-fold defaultstate="collapsed" desc="Generated Code"

private void initComponents() {

jPanel1 = new javax.swing.JPanel();

jLabel1 = new javax.swing.JLabel();

jLabel2 = new javax.swing.JLabel();

jLabel3 = new javax.swing.JLabel();

jTextField1 = new javax.swing.JTextField();

jPasswordField1 = new javax.swing.JPasswordField();

jButton1 = new javax.swing.JButton();

jButton2 = new javax.swing.JButton();

setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

jLabel1.setFont(new java.awt.Font("宋体", 0, 18)); // NOI18N

jLabel1.setText("Login");

jLabel2.setText("Username:");

jLabel3.setText("Password:");

jTextField1.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

jTextField1ActionPerformed(evt);

}

});

jPasswordField1.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

jPasswordField1ActionPerformed(evt);

}

});

jButton1.setText("Login");

jButton1.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

jButton1ActionPerformed(evt);

}

});

jButton2.setText("Reset");

jButton2.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

jButton2ActionPerformed(evt);

}

});

javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);

jPanel1.setLayout(jPanel1Layout);

jPanel1Layout.setHorizontalGroup(

jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(jPanel1Layout.createSequentialGroup()

.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(jPanel1Layout.createSequentialGroup()

.addGap(28, 28, 28)

.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)

.addGroup(jPanel1Layout.createSequentialGroup()

.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addComponent(jLabel2)

.addComponent(jLabel3))

.addGap(33, 33, 33)

.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)

.addComponent(jPasswordField1, 0, 0, Short.MAX_VALUE)

.addComponent(jTextField1, javax.swing.GroupLayout.DEFAULT_SIZE, 108, Short.MAX_VALUE)))

.addGroup(jPanel1Layout.createSequentialGroup()

.addComponent(jButton1)

.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)

.addComponent(jButton2))))

.addGroup(jPanel1Layout.createSequentialGroup()

.addGap(101, 101, 101)

.addComponent(jLabel1)))

.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))

);

jPanel1Layout.setVerticalGroup(

jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(jPanel1Layout.createSequentialGroup()

.addContainerGap()

.addComponent(jLabel1)

.addGap(18, 18, 18)

.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)

.addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)

.addComponent(jLabel2))

.addGap(18, 18, 18)

.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)

.addComponent(jPasswordField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)

.addComponent(jLabel3))

.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 35, Short.MAX_VALUE)

.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)

.addComponent(jButton1)

.addComponent(jButton2)))

);

javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());

getContentPane().setLayout(layout);

layout.setHorizontalGroup(

layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(layout.createSequentialGroup()

.addContainerGap()

.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)

.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))

);

layout.setVerticalGroup(

layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()

.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)

.addContainerGap())

);

pack();

}// /editor-fold

private void jPasswordField1ActionPerformed(java.awt.event.ActionEvent evt) {

// TODO add your handling code here:

}

private void jTextField1ActionPerformed(java.awt.event.ActionEvent evt) {

// TODO add your handling code here:

}

private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {

this.jTextField1.setText("");

this.jPasswordField1.setText("");

}

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {

String inputUsername = this.jTextField1.getText();

String inputPassword = String.valueOf(this.jPasswordField1.getPassword());

if(inputUsername.equals(username) inputPassword.equals(password)) {

JOptionPane.showMessageDialog(this, "Login success!");

} else {

JOptionPane.showMessageDialog(this, "Login failed!");

}

/**

* @param args the command line arguments

public static void main(String args[]) {

java.awt.EventQueue.invokeLater(new Runnable() {

public void run() {

JFrame.setDefaultLookAndFeelDecorated(true);

}

});

}

// Variables declaration - do not modify

private javax.swing.JButton jButton1;

private javax.swing.JButton jButton2;

private javax.swing.JLabel jLabel1;

private javax.swing.JLabel jLabel2;

private javax.swing.JLabel jLabel3;

private javax.swing.JPanel jPanel1;

private javax.swing.JPasswordField jPasswordField1;

private javax.swing.JTextField jTextField1;

// End of variables declaration

}

java后台参数校验，比如是否是汉子、字母、数字的组合，这种校验出了正则表达式，还有别的方法吗？

public class Test {

public static void main(String args[]) {

String a= "ddd122";//输出true，没中文

//a="我";//输出false，有中文

System.out.println(a.length()==a.getBytes().length);

}

这种方法可以判断是否含有中文。

使用Java如何验证所以日期是否正确

Java为了支持多语言，没有固定的日期格式。你需要根据自己的需要指定日期格式，然后用DateFormat类或者SimpleDateFormat类来判断是否是正确的日期格式。下面的例子供参考。更详细的内容（比如yyyy,MM,dd各代表什么）可以参考javadoc。

public class DateUtil

{

private static final SimpleDateFormat dateFormat = null;

static

{

// 指定日期格式为四位年/两位月份/两位日期，注意yyyy/MM/dd区分大小写；

dateFormat = new SimpleDateFormat("yyyy/MM/dd");

// 设置lenient为false. 否则SimpleDateFormat会比较宽松地验证日期，比如2007/02/29会被接受，并转换成2007/03/01

dateFormat.setLenient(false);

}

public static boolean isValidDate(String s)

{

try

{

dateFormat.parse(s);

return true;

}

catch (Exception e)

{

// 如果throw java.text.ParseException或者NullPointerException，就说明格式不对

return false;

}

// 下面这个方法则可以将一个日期按照你指定的格式输出

public static String formatDate(Date d)

{

return dateFormat.format(d);

}

java校验设计的介绍就聊到这里吧，感谢你花时间阅读本站内容，更多关于java数据校验框架、java校验设计的信息别忘了在本站进行查找喔。

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