SpringBoot之访问控制层Controller

首先，从模块的业务场景和业务功能出发，考虑需要提供哪些接口，每个接口的名称，需要哪些参数(是否必填、参数类型等)，以及返回什么数据。这是从业务需求的角度来考虑的，不容易跑偏，避免编写不需要的代码，做无用功。

• StudentController继承BaseController

@Controller
@RequestMapping(value = "/student")
public class StudentController extends BaseController {

    @Autowired
    private StudentService studentService;

    @RequestMapping(value = "/students")
    public ModelAndView students(Integer classId) throws Exception {
        return feedback(studentService.findByClass(classId));
    }
}

• 其中BaseController封装访问控制层公用方法

public class BaseController {

    protected ModelAndView feedback(Object obj) {
        Object result = obj != null ? obj : "success";
        Map<String, Object> data = new HashMap<>();
        data.put("errcode", 0);
        data.put("result", result);
        return new ModelAndView(new JsonView(data));
    }
}

• 其中使用到了自定义视图JsonView，用于接口返回json格式的数据，代码如下：

public class JsonView extends AbstractView {

    private Object result;

    public JsonView(Object result) {
        super();
        this.result = result;
    }

    @Override
    protected void renderMergedOutputModel(Map<String, Object> map, HttpServletRequest httpServletRequest,
                                           HttpServletResponse response) throws Exception {
        response.setContentType("application/json; charset=UTF-8");
        response.setHeader("Cache-Control", "no-cache");
        response.getWriter().write(JSON.toJSONString(result));
    }
}

• 这里我们用到了阿里巴巴的fastjson，通过pom.xml引入

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.2.28</version>
</dependency>