尝试使用
Spring MVC构建RESTful Web服务.
控制器应返回特定的Java类型,但响应主体必须是通用信封.如何才能做到这一点？
以下代码部分是我到目前为止所拥有的：
控制器方法：
@Controller
@RequestMapping(value = "/mycontroller")
public class MyController {
public ServiceDetails getServiceDetails() {
return new ServiceDetails("MyService");
}
}@H_404_9@
回复信封：
public class Response<T> {
private String message;
private T responseBody;
}@H_404_9@
ServiceDetails代码：
public class ServiceDetails {
private String serviceName;
public ServiceDetails(String serviceName) {
this.serviceName = serviceName;
}
}@H_404_9@
对客户的最终回应应显示为：
{
"message" : "Operation OK"
"responseBody" : {
"serviceName" : "MyService"
}
}@H_404_9@
解决方法
你可以做的是让一个MyRestController只是将结果包装在一个响应中,如下所示：
@Controller
@RequestMapping(value = "/mycontroller")
public class MyRestController {
@Autowired
private MyController myController;
@RequestMapping(value = "/details")
public @ResponseBody Response<ServiceDetails> getServiceDetails() {
return new Response(myController.getServiceDetails(),"Operation OK");
}
}@H_404_9@
此解决方案使您的原始MyController与REST代码保持独立.看来你需要在类路径中包含Jackson,以便Spring自动神奇地序列化为JSON(详见this)
编辑
看来你需要更通用的东西……所以这里有一个建议.
@Controller
@RequestMapping(value = "/mycontroller")
public class MyGenericRestController {
@Autowired
private MyController myController;
//this will match all "/myController/*"
@RequestMapping(value = "/{operation}")
public @ResponseBody Response getGenericOperation(String @PathVariable operation) {
Method operationToInvoke = findMethodWithRequestMapping(operation);
Object responseBody = null;
try{
responseBody = operationToInvoke.invoke(myController);
}catch(Exception e){
e.printStackTrace();
return new Response(null,"operation Failed");
}
return new Response(responseBody,"Operation OK");
}
private Method findMethodWithRequestMapping(String operation){
//TODO
//This method will use reflection to find a method annotated
//@RequestMapping(value=<operation>)
//in myController
return ...
}
}@H_404_9@
并保持原来的“myController”几乎与原样：
@Controller
public class MyController {
//this method is not expected to be called directly by spring MVC
@RequestMapping(value = "/details")
public ServiceDetails getServiceDetails() {
return new ServiceDetails("MyService");
}
}@H_404_9@
主要问题是：MyController中的@RequestMapping可能需要被一些自定义注释替换(并调整findMethodWithRequestMapping以对此自定义注释执行内省).
