有自己的经验，也有从老师傅那里偷来的。 编程就跟练武一样，只要练好内功，框架再怎么更新都只是花架子而已。N年前的规范拿到现在依然是最棒的，不得不感叹前辈的高明。
alibaba-p3c sonarlint 代码风格：google-code-style.xml
JRebel支持热部署，使用方法：
https://zeroturnaround.com/software/jrebel/quickstart/intellij/?run=ide#!/reload
1. [Activation](https://my.jrebel.com/account/how-to-activate) 2. Press the jrebel-ide-icon Run with JRebel 3. a. Open View > Tool Windows > JRebel. The JRebel Panel window opens. b. Enable JRebel for the desired modules by selecting the column checkboxes. 4. a. Restart your Java application using jrebel-ide-icon Run with JRebel (or from the command line). b. Change something in the application code. c. Use Build > Build Project command to compile classes and update your application.
激活要先完成第一步的流程。 因为是第一次用JRebel，所以先JRebel启动，然后第3步完成勾选，再重新启动JRebel。第二次就直接使用JRebel启动项目，无须勾选。
pom.xml
<packaging>war</packaging>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jetty</artifactId>
</dependency>
<plugin>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-maven-plugin</artifactId>
<version>9.4.9.v20180320</version>
</plugin>add configuration > maven
在command line 里：clean:clean jetty:run
pom.xml
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.9.5</version>
</dependency>spring-mvc.xml
<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
<property name="messageConverters">
<list>
<ref bean="mappingJacksonHttpMessageConverter"/>
</list>
</property>
</bean>
<bean id="mappingJacksonHttpMessageConverter"
class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
<property name="supportedMediaTypes">
<list>
<bean class="org.springframework.http.MediaType">
<constructor-arg index="0" value="text"/>
<constructor-arg index="1" value="plain"/>
<constructor-arg index="2" value="UTF-8"/>
</bean>
<bean class="org.springframework.http.MediaType">
<constructor-arg index="0" value="*"/>
<constructor-arg index="1" value="*"/>
<constructor-arg index="2" value="UTF-8"/>
</bean>
<bean class="org.springframework.http.MediaType">
<constructor-arg index="0" value="text"/>
<constructor-arg index="1" value="*"/>
<constructor-arg index="2" value="UTF-8"/>
</bean>
<bean class="org.springframework.http.MediaType">
<constructor-arg index="0" value="application"/>
<constructor-arg index="1" value="json"/>
<constructor-arg index="2" value="UTF-8"/>
</bean>
</list>
</property>
</bean>这里仅支持UTF-8编码，即请求头Accept的编码，如：Accept:application/json;charset=utf-8，其它的可能会乱码或没有对应的converter。
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