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RESTful简化
===========

前置RequestMapping注解：

@Controller
@RequestMapping("/books")
public class BookController { ... }

前置ResponseBody注解：

@Controller
@RequestMapping("/books")
@ResponseBody
public class BookController { ... }

合并Controller和ResponseBody注解：

@RestController
@RequestMapping("/books")
public class BookController { ... }

简化方法注解：

@RestController
@RequestMapping("/books")
public class BookController {
    @PostMapping
    public String addBook(@RequestBody Book book) { ... }

    @DeleteMapping("/{id}")
    public String delBook(@PathVariable Integer id) { ... }

    @PutMapping
    public String modBook(@RequestBody Book book) { ... }

    @GetMapping("/{id}")
    public String getBook(@PathVariable Integer id) { ... }

    @GetMapping
    public String getBooks() { ... }
}

例程：springboot_02_02_restful