fix<调整数据库链接源>

src/main/java/example/dao/UserDao.java

@@ -43,7 +43,7 @@ public class UserDao {
 
     public static void main(String[] args) throws Exception {
         UserDao userDao = new UserDao();
-        System.out.println(userDao.getUserById(1).getUsername());
+        System.out.println(userDao.getAllUser());
     }
 
 }

src/main/java/example/utils/DBUtils.java

@@ -3,22 +3,10 @@ package example.utils;
 import com.mchange.v2.c3p0.ComboPooledDataSource;
 
 public class DBUtils {
-    private static ComboPooledDataSource dataSource;
-
-    static {
-        try {
-            dataSource = new ComboPooledDataSource();
-            dataSource.setDriverClass("com.mysql.cj.jdbc.Driver");
-            dataSource.setJdbcUrl("jdbc:mysql://localhost:3306/work?useSSL=false&serverTimezone=UTC");
-            dataSource.setUser("root");
-            dataSource.setPassword("root");
-        } catch (Exception e) {
-            e.printStackTrace();
-        }
-    }
+    // 使用默认配置名 "default-config" 从c3p0-config.xml文件中获取数据源配置
+    private static ComboPooledDataSource dataSource = new ComboPooledDataSource("default-config");
 
     public static ComboPooledDataSource getDataSource() {
         return dataSource;
     }
-
-}
+}

src/main/resources/c3p0-config.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<c3p0-config>
+    <default-config>
+        <property name="driverClass">com.mysql.cj.jdbc.Driver</property>
+        <property name="jdbcUrl">jdbc:mysql://localhost:3306/work?serverTimezone=GMT%2B8&amp;useUnicode=true&amp;characterEncoding=utf-8&amp;useSSL=false</property>
+        <property name="user">root</property>
+        <property name="password">root</property>
+    </default-config>
+</c3p0-config>