初始化

.gitignore

@@ -0,0 +1,38 @@
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store

.idea/.gitignore

@@ -0,0 +1,8 @@
+# 默认忽略的文件
+/shelf/
+/workspace.xml
+# 基于编辑器的 HTTP 客户端请求
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml

.idea/encodings.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Encoding" defaultCharsetForPropertiesFiles="UTF-8">
+    <file url="file://$PROJECT_DIR$/src/main/java" charset="UTF-8" />
+    <file url="file://$PROJECT_DIR$/src/main/resources" charset="UTF-8" />
+    <file url="PROJECT" charset="UTF-8" />
+  </component>
+</project>

.idea/misc.xml

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ExternalStorageConfigurationManager" enabled="true" />
+  <component name="MavenProjectsManager">
+    <option name="originalFiles">
+      <list>
+        <option value="$PROJECT_DIR$/pom.xml" />
+      </list>
+    </option>
+    <option name="workspaceImportForciblyTurnedOn" value="true" />
+  </component>
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_17" default="true" project-jdk-name="1.8" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>

pom.xml

@@ -0,0 +1,42 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>org.example</groupId>
+    <artifactId>billManager</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <properties>
+        <maven.compiler.source>17</maven.compiler.source>
+        <maven.compiler.target>17</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
+    <dependencies>
+        <!-- MySQL JDBC 驱动 -->
+        <dependency>
+            <groupId>mysql</groupId>
+            <artifactId>mysql-connector-java</artifactId>
+            <version>8.0.26</version>
+        </dependency>
+
+        <!-- JUnit 测试框架 -->
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.13.2</version>
+            <scope>test</scope>
+        </dependency>
+
+        <!-- lombok依赖 -->
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <version>1.18.22</version>
+        </dependency>
+    </dependencies>
+
+
+</project>

src/main/java/org/example/BillApplication.java

@@ -0,0 +1,68 @@
+package org.example;
+
+import org.example.dao.BillDao;
+import org.example.domain.Bill;
+
+import java.sql.SQLException;
+import java.util.List;
+import java.util.Scanner;
+
+public class BillApplication {
+    public static void main(String[] args) {
+
+        // 设置编码（仅在需要时启用）
+        try {
+            System.setOut(new java.io.PrintStream(System.out,true,"UTF-8"));
+        } catch (java.io.UnsupportedEncodingException e) {
+            System.err.println("无法设置UTF-8编码：" + e.getMessage());
+        }
+
+        // 数据库连接配置
+        String jdbcURL = "jdbc:mysql://localhost:3306/test";
+        String jdbcUsername = "mengyu";
+        String jdbcPassword = "@Liu8023520";
+
+        BillDao billDao = new BillDao(jdbcURL,jdbcUsername,jdbcPassword);
+
+        Scanner scanner = new Scanner(System.in);
+
+        while (true) {
+            System.out.println("请选择操作：1.添加账单 2.查询账单 3.退出");
+            int choice = scanner.nextInt();
+            // 消耗换行符
+            scanner.nextLine();
+
+            if (choice == 1) {
+                System.out.println("输入账单日期：");
+                String date = scanner.nextLine();
+                System.out.println("输入账单金额：");
+                double amount = scanner.nextDouble();
+                // 消耗换行符
+                scanner.nextLine();
+
+                Bill bill = new Bill(0,date,amount);
+                try {
+                    billDao.add(bill);
+                    System.out.println("账单添加成功！");
+                } catch (SQLException e) {
+                    e.printStackTrace();
+                }
+            } else if (choice == 2) {
+                try {
+                    List<Bill> bills = billDao.selectAll();
+                    for (Bill bill :bills) {
+                        System.out.println(bill);
+                    }
+                } catch (SQLException e) {
+                    e.printStackTrace();
+                }
+            } else if (choice == 3) {
+                break;
+            } else {
+                System.out.println("无效选择，请重新输入！");
+            }
+        }
+
+        scanner.close();
+    }
+}

src/main/java/org/example/dao/BillDao.java

@@ -0,0 +1,77 @@
+package org.example.dao;
+
+import org.example.domain.Bill;
+
+import java.sql.*;
+import java.util.ArrayList;
+import java.util.List;
+
+public class BillDao {
+    // 数据库连接地址
+    private String jdbcURL;
+    // 数据库用户名
+    private String jdbcUsername;
+    // 数据库密码
+    private String jdbcPassword;
+    // 数据库连接
+    private Connection jdbcConnection;
+
+    // 构造函数
+    public BillDao(String jdbcURL, String jdbcUsername, String jdbcPassword) {
+        this.jdbcURL = jdbcURL;
+        this.jdbcUsername = jdbcUsername;
+        this.jdbcPassword = jdbcPassword;
+    }
+
+    // 连接数据库
+    protected void connect() throws SQLException {
+        if (jdbcConnection == null || jdbcConnection.isClosed()) {
+            jdbcConnection = DriverManager.getConnection(jdbcURL,jdbcUsername,jdbcPassword);
+        }
+    }
+
+    // 断开数据库连接
+    protected void disconnect() throws SQLException {
+        if (jdbcConnection != null && !jdbcConnection.isClosed()) {
+            jdbcConnection.close();
+        }
+    }
+
+
+    //封装添加数据的实例成员方法add()
+    public boolean add(Bill bill) throws SQLException {
+        String sql = "INSERT INTO bill (billDate,billMonery) VALUES (?,?)";
+        connect();
+        // 创建PreparedStatement对象
+        PreparedStatement statement = jdbcConnection.prepareStatement(sql);
+        statement.setString(1, bill.getBillDate());
+        statement.setDouble(2,bill.getBillMonery());
+        boolean rowInserted = statement.executeUpdate() > 0;
+        statement.close();
+        disconnect();
+        return rowInserted;
+    }
+
+
+    //封装查询数据的实例成员方法selectAll()
+    public List<Bill> selectAll() throws SQLException{
+        ArrayList<Bill> billArrayList = new ArrayList<>();
+        String sql = "SELECT billId,billDate,billMonery FROM bill";
+
+        connect();
+        Statement statement = jdbcConnection.createStatement();
+        ResultSet resultSet = statement.executeQuery(sql);
+        while (resultSet.next()) {
+            int billId = resultSet.getInt("billId");
+            String billDate = resultSet.getString("billDate");
+            Double billMonery = resultSet.getDouble("billMonery");
+            Bill bill = new Bill(billId,billDate,billMonery);
+            billArrayList.add(bill);
+        }
+        resultSet.close();
+        statement.close();
+        disconnect();
+        return billArrayList;
+    }
+
+}

src/main/java/org/example/domain/Bill.java

@@ -0,0 +1,28 @@
+package org.example.domain;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import java.util.Date;
+
+/**
+ * 账单
+ */
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+public class Bill {
+    /**
+     * 账单编号
+     */
+    private Integer billId;
+    /**
+     * 账单时间
+     */
+    private String billDate;
+    /**
+     * 账单金额
+     */
+    private Double billMonery;
+}