[add] 修改了备用数据库切换

src/main/java/com/waterquality/projectmanagement/ProjectManagementApplication.java

@@ -2,7 +2,9 @@ package com.waterquality.projectmanagement;
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
 
+/*
 @SpringBootApplication
 public class ProjectManagementApplication {
 
@@ -11,3 +13,11 @@ public class ProjectManagementApplication {
     }
 
 }
+*/
+
+@SpringBootApplication(exclude = {DataSourceAutoConfiguration.class})
+public class ProjectManagementApplication {
+    public static void main(String[] args) {
+        SpringApplication.run(ProjectManagementApplication.class, args);
+    }
+}

src/main/java/com/waterquality/projectmanagement/config/SecurityConfig.java

@@ -66,6 +66,7 @@ public class SecurityConfig {
                 .sessionManagement(session -> session.sessionCreationPolicy(SessionCreationPolicy.STATELESS))
                 .authorizeHttpRequests(authz -> authz
                         .requestMatchers("/api/auth/**").permitAll() // 允许认证相关接口无需鉴权
+                        .requestMatchers("/health").permitAll() // 允许认证相关接口无需鉴权
                         .requestMatchers("/api/**").authenticated()  // 只有 /api/** 下的路由需要鉴权
                         .requestMatchers("/static/**", "/css/**", "/js/**", "/assets/**", "/favicon.ico").permitAll() // 显式放通静态资源
                         .requestMatchers("/", "/index.html").permitAll() // 放通 SPA 的入口页面

src/main/java/com/waterquality/projectmanagement/config/database/DataSourceConfig.java

@@ -0,0 +1,58 @@
+package com.waterquality.projectmanagement.config.database;
+
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.boot.jdbc.DataSourceBuilder;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Primary;
+import org.springframework.jdbc.datasource.DataSourceTransactionManager;
+import org.springframework.transaction.PlatformTransactionManager;
+import org.springframework.transaction.annotation.EnableTransactionManagement;
+
+import javax.sql.DataSource;
+import java.util.HashMap;
+import java.util.Map;
+
+@Configuration
+@EnableTransactionManagement
+public class DataSourceConfig {
+
+    // 主库数据源
+    @Bean(name = "masterDataSource")
+    @ConfigurationProperties(prefix = "spring.datasource.master")
+    public DataSource masterDataSource() {
+        return DataSourceBuilder.create().build();
+    }
+
+    // 备库数据源
+    @Bean(name = "slaveDataSource")
+    @ConfigurationProperties(prefix = "spring.datasource.slave")
+    public DataSource slaveDataSource() {
+        return DataSourceBuilder.create().build();
+    }
+
+    // 动态数据源（主备切换）
+    @Primary
+    @Bean(name = "dynamicDataSource")
+    public DataSource dynamicDataSource(
+            @Qualifier("masterDataSource") DataSource master,
+            @Qualifier("slaveDataSource") DataSource slave) {
+
+        DynamicRoutingDataSource dynamicDataSource = new DynamicRoutingDataSource();
+        Map<Object, Object> dataSourceMap = new HashMap<>();
+        dataSourceMap.put("master", master);
+        dataSourceMap.put("slave", slave);
+
+        // 默认使用主库
+        dynamicDataSource.setDefaultTargetDataSource(master);
+        dynamicDataSource.setTargetDataSources(dataSourceMap);
+        return dynamicDataSource;
+    }
+
+    // 配置事务管理器
+    @Bean
+    public PlatformTransactionManager transactionManager(DataSource dynamicDataSource) {
+        return new DataSourceTransactionManager(dynamicDataSource);
+    }
+}

src/main/java/com/waterquality/projectmanagement/config/database/DynamicRoutingDataSource.java

@@ -0,0 +1,20 @@
+package com.waterquality.projectmanagement.config.database;
+
+import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;
+
+import java.util.concurrent.atomic.AtomicBoolean;
+
+public class DynamicRoutingDataSource extends AbstractRoutingDataSource {
+
+    private static final AtomicBoolean isMasterAvailable = new AtomicBoolean(true);
+
+    @Override
+    protected Object determineCurrentLookupKey() {
+        // 默认路由到主库，若主库不可用则切换到备库
+        return isMasterAvailable.get() ? "master" : "slave";
+    }
+
+    public static void setMasterAvailable(boolean available) {
+        isMasterAvailable.set(available);
+    }
+}

src/main/java/com/waterquality/projectmanagement/controller/HealthController.java

@@ -0,0 +1,18 @@
+package com.waterquality.projectmanagement.controller;
+
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.Collections;
+import java.util.Map;
+
+@RestController
+public class HealthController {
+    @GetMapping("/health")
+    public ResponseEntity<Map<String, String>> health() {
+        // 简单返回 UP 状态
+        Map<String, String> status = Collections.singletonMap("status", "UP");
+        return ResponseEntity.ok(status);
+    }
+}