maven项目应用openfeign，从此和httpClient说拜拜
pom.xml:
<dependency>
<groupId>io.github.openfeign</groupId>
<artifactId>feign-jaxb</artifactId>
<version>9.7.0</version>
</dependency>
<dependency>
<groupId>io.github.openfeign</groupId>
<artifactId>feign-jackson</artifactId>
<version>9.7.0</version>
</dependency>
<dependency>
<groupId>io.github.openfeign</groupId>
<artifactId>feign-core</artifactId>
<version>9.7.0</version>
</dependency> 
