springboot进阶之web进阶

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慕课网完整教程

以下教程完整源码

@Valid 表单验证

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//控制器
@PostMapping("/insert")
   public Gril insert(@Valid  Gril g1, BindingResult bindingResult){
       if(bindingResult.hasErrors()){
           System.out.println(bindingResult.getFieldError().getDefaultMessage());
       }
       Gril g=new Gril();
       g.setAge(g1.getAge());
       g.setCupSize(g1.getCupSize());

       return grilRepository.save(g);

   }

//实体类
@Min(value = 18,message = "没成年不能插入数据库")
private Integer age;

AOP 面向切面编程思想

  • 图解:将通用业务从具体逻辑中分离出来

AOP记录http请求

  • @After
  • @Before
  • @AfterReturning

统一异常处理

自己写返回格式

  • 新建Result类
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public class Result<T> {
    //错误码
    private Integer code;
    //错误信息
    private String msg;
    //数据 T是个泛型
    private T data;

    public Integer getCode() {
        return code;
    }

    public void setCode(Integer code) {
        this.code = code;
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

    public T getData() {
        return data;
    }

    public void setData(T data) {
        this.data = data;
    }
}
/*//通一异常处理 单个对象返回json举例
//错误时
{
     "code":1,
     "msg":"金额必传",
     "data":null
}
//正确时
{
        "code":0,
        "msg":"成功",
        "data":{
            "id":20,
             "cupSize":"B",
             "age":25,
             "money":1.2
        }
}*/
  • 在controller类使用
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    public Object insert(@Valid  Gril g1, BindingResult bindingResult){
           if(bindingResult.hasErrors()){
    //            System.out.println(bindingResult.getFieldError().getDefaultMessage());
               //改进 统一异常处理 @Autowrite引入报错
                   Result result=new Result();
                   result.setCode(1);
                   result.setMsg(bindingResult.getFieldError().getDefaultMessage());
                   result.setData(null);
                   return result;

           }
           Gril g=new Gril();
           g.setAge(g1.getAge());
           g.setCupSize(g1.getCupSize());
           Result result=new Result();
           result.setCode(0);
           result.setMsg("成功");
           result.setData(grilRepository.save(g));

           return result;

       }


把上面的代码用工具类ResultUtil 封装

  • 实现年龄判断并做相应处理 统一异常返回格式。
  • ResultUtil.err(1,”未成年禁止入内”);
  • @ControllerAdvance
  • @ExceptionHandel
  • @ResponseBody
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    //新建工具类
    public class ResultUtil {
        public static Result success(Object object){
            Result result=new Result();
            result.setCode(0);
            result.setMsg("成功");
            result.setData(object);
            return result;
        }
        public static Result success(){
            return success(null);
        }
        public static Result err(Integer code,String msg){
            Result result=new Result();
            result.setCode(code);
            result.setMsg(msg);
            return result;

        }
    }
    //GrilService
    public void getAge(Integer id)throws Exception{
           Gril gril=grilRepository.getOne(id);
           if(gril.getAge()<10){
               throw new Exception("你在上小学");
           }else if(gril.getAge()<30){
               throw new Exception("你在上初中");
           }
       }
    //Controller
    @GetMapping(value = "/getAge/{id}")
       public void getAge(@PathVariable("id")Integer id)throws Exception{
           grilService.getAge(id);
       }
    //ExceptionHandel
    @ControllerAdvice
    public class ExceptionHandel {
        //获取具体Controller类抛出的异常
        @ExceptionHandler(value = Exception.class)
        @ResponseBody
        public Result handel(Exception e){
            return ResultUtil.err(100,e.getMessage());
        }

    }

在改进 自定义异常GrilException

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public class GrilException extends RuntimeException{
    private Integer code;

    public GrilException(Integer code ,String msg) {
        super(msg);
        this.code = code;
    }

    public Integer getCode() {
        return code;
    }

    public void setCode(Integer code) {
        this.code = code;
    }
}
//使用
//GrilService
public void getAge(Integer id)throws Exception{
        Gril gril=grilRepository.getOne(id);
        if(gril.getAge()<10){
            throw new GrilException(100,"你在上小学");
        }else if(gril.getAge()<30){
            throw new GrilException(101,"你在上初中");
        }
    }
//GrilController
@GetMapping(value = "/getAge/{id}")
  public void getAge(@PathVariable("id")Integer id)throws Exception{
      grilService.getAge(id);
  }
//ExceptionHandel
@ControllerAdvice
public class ExceptionHandel {
    private final static Logger logger=LoggerFactory.getLogger(ExceptionHandler.class);
    //获取具体Controller类抛出的异常
    @ExceptionHandler(value = Exception.class)
    @ResponseBody
    public Result handel(Exception e){
        if(e instanceof GrilException){
            GrilException grilException=(GrilException)e;
            return ResultUtil.err(grilException.getCode(),grilException.getMessage());
        }else {
            logger.error("【系统异常】{}");
            return ResultUtil.err(-1,"未知错误");
        }

    }

在改进 把错误码方法enum中管理

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//ResultEnum
public enum ResultEnum {
    UNKNOW_ERROR(-1,"未知错误"),
    SUCCESS(0,"成功"),
    PRIMARY_SCHOOL(100,"还在上小学"),
    MIDDLE_SCHOOL(101,"还在上初中"),
    ;


    private Integer code;
    private String msg;

    ResultEnum(Integer code, String msg) {
        this.code = code;
        this.msg = msg;
    }

    public Integer getCode() {
        return code;
    }

    public void setCode(Integer code) {
        this.code = code;
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }
}
//使用
//GrilService
public void getAge(Integer id)throws Exception{
       Gril gril=grilRepository.getOne(id);

       if(gril.getAge()<10){
           throw new GrilException(ResultEnum.PRIMARY_SCHOOL.getCode(),ResultEnum.PRIMARY_SCHOOL.getMsg());
       }else if(gril.getAge()<30){
           throw new GrilException(ResultEnum.MIDDLE_SCHOOL.getCode(),ResultEnum.MIDDLE_SCHOOL.getMsg());
       }
   }
//GrilController
public void getAge(Integer id)throws Exception{
       Gril gril=grilRepository.getOne(id);

       if(gril.getAge()<10){
           throw new GrilException(ResultEnum.PRIMARY_SCHOOL);
       }else if(gril.getAge()<30){
           throw new GrilException(ResultEnum.MIDDLE_SCHOOL);
       }
   }
//报错 需改 GrilException
public class GrilException extends RuntimeException{
    private Integer code;

    public GrilException(ResultEnum resultEnum) {
        super(resultEnum.getMsg());
        this.code = resultEnum.getCode();
    }

    public Integer getCode() {
        return code;
    }

    public void setCode(Integer code) {
        this.code = code;
    }
}
//ExceptionHandel 不用改
@ControllerAdvice
public class ExceptionHandel {
    private final static Logger logger=LoggerFactory.getLogger(ExceptionHandler.class);
    //获取具体Controller类抛出的异常
    @ExceptionHandler(value = Exception.class)
    @ResponseBody
    public Result handel(Exception e){
        if(e instanceof GrilException){
            GrilException grilException=(GrilException)e;
            return ResultUtil.err(grilException.getCode(),grilException.getMessage());
        }else {
            logger.error("【系统异常】{}");
            return ResultUtil.err(-1,"未知错误");
        }

    }

}

单元测试

  • 对api接口(Mappering(url)) /service/ controller方法进行测试
  • @RunWith
  • @SpringBootTest
  • @AutoConfigureMockMvc
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@RunWith(SpringRunner.class)
@SpringBootTest
@AutoConfigureMockMvc
public class GrilControllerTest {
    @Autowired
    private MockMvc mvc;
    @Test
    public void grilList() throws Exception{
        mvc.perform(MockMvcRequestBuilders.get("/grilList"))
                .andExpect(MockMvcResultMatchers.status().isOk())
                .andExpect(MockMvcResultMatchers.content().string("abc"));

    }
}

多个单元测试

  • 项目打包时会自动运行测试类 有错则打包失败