原理：http://blog.csdn.net/z69183787/article/details/52290032
1、基于Controller 注解
Advice：
@ControllerAdvice(annotations = RestController.class)
public class JsonpAdvice extends AbstractJsonpResponseBodyAdvice {
public JsonpAdvice() {
super("callback","jsonp");
}
}
controller：
@RestController
@RequestMapping("/api")
public class ApiController {}
2、基于包名
Advice：xxxxx包名下的所有Controller，且返回为 responseBody
@ControllerAdvice(basePackages = "com.xxxxxxx")
public class JsonpAdvice extends AbstractJsonpResponseBodyAdvice {
public JsonpAdvice() {
super("callback", "jsonp");
}
}
controller：
@Controller
@RequestMapping("/api")
public class ApiController {}
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