Spring Boot 2.0

spring boot 2.0正式版本发布有段时间了，关于新特性的东西网上随便搜索一大堆，修改了很多东西。由于我需要将公司项目升级到spring cloud，所以想想干脆升级一下spring boot，下面记录我升级的过程。

pom.xml

首先肯定是要将版本号升级到最新的2.0.1.RELEASE，其次取消的log4j的包，需要手工在pom中添加，如果用到了redis，则需要添加commons-pool2包。

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yml配置参数改动

原spring.http.或spring.server.下的一些参数，例如我用到了文件上传参数，已修改为sping.servlet.multipart下

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redis改动

redis默认实现类从原来的Jedis改为lettuce
yml中参数也需要修改

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/**
 * @Autor: Show
 * @Description: Redis缓存配置
 * @Date: 2018-01-31 13:32
 * @Modified By:
 * @Remark:
 */
@EnableCaching
@Configuration
@ConditionalOnClass(RedisOperations.class)
@EnableConfigurationProperties(RedisProperties.class)
public class RedisConfig extends CachingConfigurerSupport {

    @Bean(name = "redisTemplate")
    @SuppressWarnings("unchecked")
    @ConditionalOnMissingBean(name = "redisTemplate")
    public RedisTemplate<Object, Object> redisTemplate(RedisConnectionFactory redisConnectionFactory) {
        RedisTemplate<Object, Object> template = new RedisTemplate<>();

        //使用fastjson序列化
        FastJsonRedisSerializer fastJsonRedisSerializer = new FastJsonRedisSerializer(Object.class);
        template.setValueSerializer(fastJsonRedisSerializer);
        template.setHashValueSerializer(fastJsonRedisSerializer);
        template.setKeySerializer(new StringRedisSerializer());
        template.setHashKeySerializer(new StringRedisSerializer());
        template.setConnectionFactory(redisConnectionFactory);
        return template;
    }

    
    @Bean
    public CacheManager cacheManager(RedisConnectionFactory redisConnectionFactory) {
        RedisCacheManager.RedisCacheManagerBuilder builder = RedisCacheManager
                .RedisCacheManagerBuilder
                .fromConnectionFactory(redisConnectionFactory);
        return builder.build();
    }
}

弃用WebMvcConfigurerAdapter

spring boot 2.0中将原来的WebMvcConfigurerAdapter替换为WebMvcConfigurer

/**
 * @Autor: Show
 * @Description:
 * @Date: 2018-04-03 8:48
 * @Modified By:
 * @Remark:
 */
@Configuration
public class DefaultViewConfig implements WebMvcConfigurer {

    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController("/").setViewName("forward:/index.html");
        registry.setOrder(Ordered.HIGHEST_PRECEDENCE);
    }
}

Validate验证注解改动

org.hibernate.validator.constraints弃用了几个注解

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例如@NoEmpty改为javax.validation.constraints.NotEmpty

EmbeddedServletContainerFactory

之前在做http地址转https时用到了这玩意，发现2.0中取消了，如下是新的写法

/**
 * @Autor: Show
 * @Description:
 * @Date: 2018-04-16 12:04
 * @Modified By:
 * @Remark:
 */
@Configuration
public class TomcatHttpsConfig {

    @Value("${server.port}")
    private Integer httpsPort;

    /*@Bean
    public ServletWebServerFactory servletContainer() {
        TomcatServletWebServerFactory tomcat = new TomcatServletWebServerFactory();
        tomcat.addAdditionalTomcatConnectors(createSslConnector()); // 添加http
        return tomcat;
    }
    
    /*该写法已经不支持，会编译不通过
    private Connector createSslConnector() {
        Connector connector = new Connector("org.apache.coyote.http11.Http11NioProtocol");
        Http11NioProtocol protocol = (Http11NioProtocol) connector.getProtocolHandler();
        connector.setScheme("https");
        connector.setSecure(true);
        connector.setPort(port);
        protocol.setSSLEnabled(true);
        protocol.setKeystoreFile(file);
        protocol.setKeystorePass(password);
        return connector;
    }*/

    @Bean
    public ServletWebServerFactory servletContainer() {
        TomcatServletWebServerFactory tomcat = new TomcatServletWebServerFactory()
        {
            @Override
            protected void postProcessContext(Context context) {
                SecurityConstraint securityConstraint = new SecurityConstraint();
                securityConstraint.setUserConstraint("CONFIDENTIAL");
                SecurityCollection collection = new SecurityCollection();
                collection.addPattern("/*");
                securityConstraint.addCollection(collection);
                context.addConstraint(securityConstraint);
            }
        };
        tomcat.addAdditionalTomcatConnectors(redirectConnector());
        return tomcat;
    }

    private Connector redirectConnector() {

        Connector connector = new Connector(TomcatServletWebServerFactory.DEFAULT_PROTOCOL);
        connector.setScheme("http");
        connector.setSecure(false);
        connector.setPort(80);
        connector.setRedirectPort(httpsPort);
        return connector;
    }
}

Spring Data MongoDB取消了findOne方法

新版本取消了findOne改为findById,findById返回Optional<T>类型，所以写法有所改动。

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大致遇到了这些问题，然后就可以正常编译启动了。