初始化
commit
047661929f
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@ -0,0 +1,38 @@
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target/
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!.mvn/wrapper/maven-wrapper.jar
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!**/src/main/**/target/
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!**/src/test/**/target/
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### IntelliJ IDEA ###
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.idea/modules.xml
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.idea/jarRepositories.xml
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.idea/compiler.xml
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.idea/libraries/
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*.iws
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*.iml
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*.ipr
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### Eclipse ###
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.apt_generated
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.classpath
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.factorypath
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.project
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.settings
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.springBeans
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.sts4-cache
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### NetBeans ###
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/nbproject/private/
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/nbbuild/
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/dist/
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/nbdist/
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/.nb-gradle/
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build/
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!**/src/main/**/build/
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!**/src/test/**/build/
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### VS Code ###
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.vscode/
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### Mac OS ###
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.DS_Store
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@ -0,0 +1,8 @@
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# 默认忽略的文件
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/shelf/
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/workspace.xml
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# 基于编辑器的 HTTP 客户端请求
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/httpRequests/
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# Datasource local storage ignored files
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/dataSources/
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/dataSources.local.xml
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@ -0,0 +1,8 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<project version="4">
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<component name="Encoding" defaultCharsetForPropertiesFiles="UTF-8">
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<file url="file://$PROJECT_DIR$/src/main/java" charset="UTF-8" />
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<file url="file://$PROJECT_DIR$/src/main/resources" charset="UTF-8" />
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<file url="PROJECT" charset="UTF-8" />
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</component>
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</project>
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@ -0,0 +1,15 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<project version="4">
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<component name="ExternalStorageConfigurationManager" enabled="true" />
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<component name="MavenProjectsManager">
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<option name="originalFiles">
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<list>
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<option value="$PROJECT_DIR$/pom.xml" />
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</list>
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</option>
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<option name="workspaceImportForciblyTurnedOn" value="true" />
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</component>
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<component name="ProjectRootManager" version="2" languageLevel="JDK_17" default="true" project-jdk-name="1.8" project-jdk-type="JavaSDK">
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<output url="file://$PROJECT_DIR$/out" />
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</component>
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</project>
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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>org.example</groupId>
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<artifactId>billManager</artifactId>
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<version>1.0-SNAPSHOT</version>
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<properties>
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<maven.compiler.source>17</maven.compiler.source>
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<maven.compiler.target>17</maven.compiler.target>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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</properties>
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<dependencies>
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<!-- MySQL JDBC 驱动 -->
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<dependency>
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<groupId>mysql</groupId>
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<artifactId>mysql-connector-java</artifactId>
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<version>8.0.26</version>
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</dependency>
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<!-- JUnit 测试框架 -->
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<dependency>
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<groupId>junit</groupId>
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<artifactId>junit</artifactId>
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<version>4.13.2</version>
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<scope>test</scope>
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</dependency>
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<!-- lombok依赖 -->
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<dependency>
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<groupId>org.projectlombok</groupId>
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<artifactId>lombok</artifactId>
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<version>1.18.22</version>
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</dependency>
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</dependencies>
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</project>
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package org.example;
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import org.example.dao.BillDao;
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import org.example.domain.Bill;
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import java.sql.SQLException;
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import java.util.List;
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import java.util.Scanner;
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public class BillApplication {
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public static void main(String[] args) {
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// 设置编码（仅在需要时启用）
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try {
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System.setOut(new java.io.PrintStream(System.out,true,"UTF-8"));
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} catch (java.io.UnsupportedEncodingException e) {
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System.err.println("无法设置UTF-8编码：" + e.getMessage());
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}
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// 数据库连接配置
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String jdbcURL = "jdbc:mysql://localhost:3306/test";
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String jdbcUsername = "mengyu";
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String jdbcPassword = "@Liu8023520";
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BillDao billDao = new BillDao(jdbcURL,jdbcUsername,jdbcPassword);
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Scanner scanner = new Scanner(System.in);
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while (true) {
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System.out.println("请选择操作：1.添加账单 2.查询账单 3.退出");
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int choice = scanner.nextInt();
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// 消耗换行符
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scanner.nextLine();
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if (choice == 1) {
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System.out.println("输入账单日期：");
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String date = scanner.nextLine();
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System.out.println("输入账单金额：");
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double amount = scanner.nextDouble();
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// 消耗换行符
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scanner.nextLine();
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Bill bill = new Bill(0,date,amount);
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try {
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billDao.add(bill);
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System.out.println("账单添加成功！");
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} catch (SQLException e) {
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e.printStackTrace();
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}
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} else if (choice == 2) {
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try {
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List<Bill> bills = billDao.selectAll();
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for (Bill bill :bills) {
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System.out.println(bill);
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}
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} catch (SQLException e) {
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e.printStackTrace();
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}
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} else if (choice == 3) {
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break;
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} else {
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System.out.println("无效选择，请重新输入！");
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}
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}
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scanner.close();
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}
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}
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package org.example.dao;
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import org.example.domain.Bill;
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import java.sql.*;
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import java.util.ArrayList;
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import java.util.List;
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public class BillDao {
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// 数据库连接地址
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private String jdbcURL;
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// 数据库用户名
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private String jdbcUsername;
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// 数据库密码
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private String jdbcPassword;
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// 数据库连接
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private Connection jdbcConnection;
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// 构造函数
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public BillDao(String jdbcURL, String jdbcUsername, String jdbcPassword) {
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this.jdbcURL = jdbcURL;
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this.jdbcUsername = jdbcUsername;
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this.jdbcPassword = jdbcPassword;
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}
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// 连接数据库
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protected void connect() throws SQLException {
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if (jdbcConnection == null || jdbcConnection.isClosed()) {
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jdbcConnection = DriverManager.getConnection(jdbcURL,jdbcUsername,jdbcPassword);
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}
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}
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// 断开数据库连接
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protected void disconnect() throws SQLException {
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if (jdbcConnection != null && !jdbcConnection.isClosed()) {
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jdbcConnection.close();
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}
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}
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//封装添加数据的实例成员方法add()
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public boolean add(Bill bill) throws SQLException {
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String sql = "INSERT INTO bill (billDate,billMonery) VALUES (?,?)";
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connect();
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// 创建PreparedStatement对象
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PreparedStatement statement = jdbcConnection.prepareStatement(sql);
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statement.setString(1, bill.getBillDate());
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statement.setDouble(2,bill.getBillMonery());
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boolean rowInserted = statement.executeUpdate() > 0;
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statement.close();
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disconnect();
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return rowInserted;
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}
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//封装查询数据的实例成员方法selectAll()
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public List<Bill> selectAll() throws SQLException{
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ArrayList<Bill> billArrayList = new ArrayList<>();
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String sql = "SELECT billId,billDate,billMonery FROM bill";
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connect();
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Statement statement = jdbcConnection.createStatement();
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ResultSet resultSet = statement.executeQuery(sql);
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while (resultSet.next()) {
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int billId = resultSet.getInt("billId");
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String billDate = resultSet.getString("billDate");
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Double billMonery = resultSet.getDouble("billMonery");
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Bill bill = new Bill(billId,billDate,billMonery);
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billArrayList.add(bill);
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}
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resultSet.close();
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statement.close();
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disconnect();
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return billArrayList;
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}
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}
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@ -0,0 +1,28 @@
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package org.example.domain;
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||||
import lombok.AllArgsConstructor;
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import lombok.Data;
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import lombok.NoArgsConstructor;
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import java.util.Date;
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||||
/**
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||||
* 账单
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||||
*/
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||||
@Data
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||||
@AllArgsConstructor
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||||
@NoArgsConstructor
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||||
public class Bill {
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||||
/**
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||||
* 账单编号
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||||
*/
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||||
private Integer billId;
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||||
/**
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||||
* 账单时间
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||||
*/
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||||
private String billDate;
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||||
/**
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||||
* 账单金额
|
||||
*/
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||||
private Double billMonery;
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||||
}
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||||
Loading…
Reference in New Issue