java - spring中将@Controller替换为@RestController的效果

Question

能否将@Controller替换为@RestController，反之亦然，对应用有何影响。

Answer 1

简单来说，@Controller 是 Spring MVC 注释，在使用 @Controller 时，您需要为每个请求映射添加 @ResponseBody`

示例:

 @Controller
 @RequestMapping("employees")
 public class EmployeeController {
 Employee employee = new Employee();
 @RequestMapping(value = "/{name}", method = RequestMethod.GET, produces = "application/json")
 public @ResponseBody Employee getEmployeeInJSON(@PathVariable String name) {
   employee.setName(name);
   employee.setEmail("employee1@genuitec.com");
 return employee; 
    }
 @RequestMapping(value = "/{name}.xml", method = RequestMethod.GET, produces = "application/xml")
 public @ResponseBody Employee getEmployeeInXML(@PathVariable String name)  {
   employee.setName(name);
  employee.setEmail("employee1@genuitec.com");
   return employee; 
   }
}

Spring 4.0引入了@RestController，这是 Controller 的一个特殊版本，它是一个方便的注释，除了添加@Controller和@ResponseBody 注释。通过使用@RestController注解来注解 Controller 类，您不再需要在所有请求映射方法中添加@ResponseBody。

示例:

 @RestController
 @RequestMapping("employees")
 public class EmployeeController {
 Employee employee = new Employee();
 @RequestMapping(value = "/{name}", method = RequestMethod.GET, produces = "application/json")
 public Employee getEmployeeInJSON(@PathVariable String name) {
   employee.setName(name);
   employee.setEmail("employee1@genuitec.com");
   return employee;
 }
 @RequestMapping(value = "/{name}.xml", method = RequestMethod.GET, produces = "application/xml")
 public Employee getEmployeeInXML(@PathVariable String name) {
   employee.setName(name);
   employee.setEmail("employee1@genuitec.com");
 return employee; 
   } 
 }

所以最后的结论是，如果您想用 @Controller 替换 @RestController ，您需要显式地将 @ResponseBody 添加到所有请求映射中