定义api
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对象转成jsonstr然后body传参
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引入retrofit相关依赖
<dependency>
<groupId>com.squareup.retrofit2</groupId>
<artifactId>retrofit</artifactId>
<version>2.4.0</version>
</dependency>
<dependency>
<groupId>com.squareup.retrofit2</groupId>
<artifactId>converter-jackson</artifactId>
<version>2.4.0</version>
</dependency>
