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

  @RestControllerAdvicepublic 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-druidspring:    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Filter与Servlet

  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

  @Mapperpublic interface InfoMapper {  @Select("select * from info where id=#{id}")  Info findById(@Param("id") Integer id);}

• Mapper的使用

  private final InfoMapper infoMapper;@Autowiredpublic 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;@Autowiredpublic 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

  # mongodata:mongodb:  database:  host:  port:  username:  password:

• 使用 MongoTemplate

  private final MongoTemplate mongoTemplate;@Autowiredpublic 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);}

项目地址：https://github.com/MyHerux/spring-boot-demo