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spring-boot-demo

  • 统一异常处理
  • Swagger
  • Druid
  • Mybatis
  • Redis
  • MongoDB

使用同一的异常处理

  • 配置 GlobalExceptionHandler.java

      @RestControllerAdvice
      public class GlobalExceptionHandler {
          private Logger logger = LoggerFactory.getLogger(GlobalExceptionHandler.class);
    
          @ExceptionHandler(value = BusinessException.class)
          public JSONObject BusinessExceptionHandler(BusinessException exception) throws IOException {
              logger.info(exception.toString());
              JSONObject jsonObject = new JSONObject();
              jsonObject.put("response_code", exception.getCode());
              jsonObject.put("message", exception.getMessage());
              return jsonObject;
          }
    
          @ExceptionHandler(value = Exception.class)
          public JSONObject OtherExceptionHandler(Exception e) throws IOException {
              logger.error(e.toString());
              JSONObject jsonObject = new JSONObject();
              jsonObject.put("response_code", "300005");
              jsonObject.put("message", "系统异常");
              return jsonObject;
          }
      }
    

集成swagger

  • 配置 pom.xml

        <!--swagger-->
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
            <version>2.2.2</version>
        </dependency>
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger-ui</artifactId>
            <version>2.2.2</version>
        </dependency>
    
    
  • 使用

      @ApiOperation(value = "获取信息", response = Info.class)
      @ApiImplicitParams({
              @ApiImplicitParam(name = "id", value = "用户id", dataType = "Integer")
      })
      @ApiResponses({
              @ApiResponse(code = 200, message = "success")
      })
      @GetMapping(value = "/get_user")
      public Info GetUser() {
          return infoMapper.findById(1);
      }
    
  • 访问:http://localhost:8089/swagger-ui.html

集成Druid

  • 配置 appplication.yaml

      # mysql-druid
      spring:
          datasource:
              type: com.alibaba.druid.pool.DruidDataSource
              driver-class-name: com.mysql.jdbc.Driver
              url: jdbc:mysql://localhost:3306/xus
              username: root
              password: 4321
              # 初始化大小,最小,最大
              initialSize: 5
              minIdle: 5
              maxIdle: 100
              maxActive: 200
              # 配置获取连接等待超时的时间
              maxWait: 5000
              # 每次使用连接时进行校验,会影响系统性能。默认为false
              testOnBorrow: false
              # 验证使用的SQL语句
              validationQuery: SELECT 1
              # 指明连接是否被空闲连接回收器(如果有)进行检验.如果检测失败,则连接将被从池中去除
              testWhileIdle: true
              # 每30秒运行一次空闲连接回收器(默认-1)
              timeBetweenEvictionRunsMillis: 30000
              # 池中的连接空闲30分钟后被回收(默认30分钟)
              minEvictableIdleTimeMillis: 1800000
              # 在每次空闲连接回收器线程(如果有)运行时检查的连接数量(设置为和maxIdle一样)
              numTestsPerEvictionRun: 100
    
  • 使用DataSourceConfig来替换默认配置

    因为Druid暂时没有专门提供给SpringBoot的定制版本,所以需要手动配置Druid的属性。

    DataSourceConfig.java:

      @Value("${spring.datasource.url}")
      private String url;
    
      @Value("${spring.datasource.username}")
      private String user;
    
      @Value("${spring.datasource.password}")
      private String password;
    
      @Value("${spring.datasource.driver-class-name}")
      private String driverClass;
    
      @Value("${spring.datasource.maxActive}")
      private Integer maxActive;
    
      @Value("${spring.datasource.initialSize}")
      private Integer initialSize;
    
      @Value("${spring.datasource.minIdle}")
      private Integer minIdle;
    
      @Value("${spring.datasource.maxWait}")
      private Integer maxWait;
    
      @Bean(name = "DataSource")
      public DataSource DataSource() {
          DruidDataSource dataSource = new DruidDataSource();
          dataSource.setDriverClassName(driverClass);
          dataSource.setUrl(url);
          dataSource.setUsername(user);
          dataSource.setPassword(password);
          dataSource.setMaxActive(maxActive);
          dataSource.setInitialSize(initialSize);
          dataSource.setMinIdle(minIdle);
          dataSource.setMaxWait(maxWait);
          return dataSource;
      }
    
    
  • 配置状态监控的FilterServlet

    Filter与Servlet配置.

    直接访问http://localhost:8080/druid/login.html,输入账号密码即可进入druid监控。

集成Mybatis

  • 配置DataSourceConfig

    使用 setMapUnderscoreToCamelCase(true) 来将数据库的下划线格式自动转换为驼峰格式。

      @Bean(name = "TransactionManager")
      public DataSourceTransactionManager TransactionManager() {
          return new DataSourceTransactionManager(DataSource());
      }
    
      @Bean(name = "SqlSessionFactory")
      public SqlSessionFactory SqlSessionFactory(@Qualifier("DataSource") DataSource dataSource) throws Exception {
          final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
          sessionFactory.setDataSource(dataSource);
          sessionFactory.getObject().getConfiguration().setMapUnderscoreToCamelCase(true);
          return sessionFactory.getObject();
      }
    
  • 推荐使用Mapper注解,替代复杂的XML文件

    @Mapper
    public interface InfoMapper {
    
        @Select("select * from info where id=#{id}")
        Info findById(@Param("id") Integer id);
    }
    
  • Mapper的使用

      private final InfoMapper infoMapper;
    
      @Autowired
      public MysqlController(InfoMapper infoMapper) {
          this.infoMapper = infoMapper;
      }
    
      @ApiOperation(value = "获取信息", response = Info.class)
      @ApiImplicitParams({
              @ApiImplicitParam(name = "id", value = "用户id", dataType = "Integer")
      })
      @ApiResponses({
              @ApiResponse(code = 200, message = "success")
      })
      @GetMapping(value = "/get_user")
      public Info GetUser() {
          return infoMapper.findById(1);
      }
    

集成Redis

  • 配置 appplication.yaml

      redis:
          database: 0       # Redis数据库索引(默认为0)
          host:
          port:
          password: :
          timeout:    # ms
          pool:
            max-active: 12   # 连接池最大连接数(使用负值表示没有限制)
            max-wait: -1     # 连接池最大阻塞等待时间(使用负值表示没有限制)
            max-idle: 4      # 连接池中的最大空闲连接
            min-idle: 1      # 连接池中的最小空闲连接
    
  • 使用 StringRedisTemplate

      private final StringRedisTemplate redisTemplate;
    
      @Autowired
      public RedisController(StringRedisTemplate redisTemplate) {
          this.redisTemplate = redisTemplate;
      }
    
    
      @ApiOperation(value = "测试Redis")
      @GetMapping(value = "/set")
      public void set() {
          // 保存字符串
          redisTemplate.opsForValue().set("aaa", "111");
    
          redisTemplate.opsForValue().get("aaa");
    
          redisTemplate.opsForSet().add("test_set", "1111");
          redisTemplate.opsForSet().add("test_set", "2222");
      }
      }
    

集成Mongo

  • 配置 appplication.yaml

    # mongo
    data:
      mongodb:
        database:
        host:
        port:
        username:
        password:
    
  • 使用 MongoTemplate

      private final MongoTemplate mongoTemplate;
    
      @Autowired
      public MongoController(MongoTemplate mongoTemplate) {
          this.mongoTemplate = mongoTemplate;
      }
    
    
      @GetMapping(value = "/test")
      public void mongoT1() {
          //对象存储
          String BASE_INFO_COLLECTION = "baseInfo";
          JSONObject json = new JSONObject();
          json.put("id", "123");
          mongoTemplate.insert(json, BASE_INFO_COLLECTION);
    
          Query query = new Query(Criteria.where("id").is("123"));
          Long count = mongoTemplate.count(query, BASE_INFO_COLLECTION);
          System.out.println("count=" + count);
      }
    
      @GetMapping(value = "/test2")
      public void MongoT2() {
          Info info = new Info();
          info.setId(111);
          info.setName("dou");
          mongoTemplate.save(info);
      }
    

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SpringBoot Demo.集成统一异常处理,Swagger,Druid,Mybatis,Redis,Mongo.

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