SpringBoot使用进阶

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一、表单验证

在实体内注解验证信息

package com.lei.domain;import javax.persistence.Entity;import javax.persistence.GeneratedValue;import javax.persistence.Id;import javax.validation.constraints.Min;@Entitypublic class Girl {    //@GeneratedValue自增    @Id    @GeneratedValue    private Integer id;    private String name;    //年龄最小为18，如果低于18提示信息为:不允许未成年入内    @Min(value = 18,message = "不允许未成年入内")    private Integer age;    private String cupSize;    //一定要有个无参的构造方法    public Girl() {    }    public Integer getAge() {        return age;    }    public void setAge(Integer age) {        this.age = age;    }    public Integer getId() {        return id;    }    public void setId(Integer id) {        this.id = id;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public String getCupSize() {        return cupSize;    }    public void setCupSize(String cupSize) {        this.cupSize = cupSize;    }}

输出表单验证是否通过（Controller）

  /**     * 添加一个女生     * BindingResult 存放验证不通过的对象     */    @PostMapping(value = "/addGirl")    public Result<Girl> addGirl(@Valid Girl girl, BindingResult bindingResult){        if (bindingResult.hasErrors()){            return ResultUtil.error(1,bindingResult.getFieldError().getDefaultMessage());        }        return ResultUtil.success(girlRepository.save(girl));    }


二、AOP统一处理
添加依赖
<dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-aop</artifactId></dependency>



Http请求拦截
package com.lei.aspect;import org.aspectj.lang.JoinPoint;import org.aspectj.lang.annotation.*;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.stereotype.Component;import org.springframework.web.context.request.RequestContextHolder;import org.springframework.web.context.request.ServletRequestAttributes;import javax.servlet.http.HttpServletRequest;/** * Http请求拦截 */@Aspect@Componentpublic class HttpAsPect {    private final static Logger logger = LoggerFactory.getLogger(HttpAsPect.class);    //定义一个切面方法，拦截GirlController下面的所有方法,(..) ..代表所有参数    @Pointcut("execution(public * com.lei.controller.GirlController.*(..))")    public void log(){    }    @Before("log()")    public void doBefore(JoinPoint joinPoint){        logger.info("调用方法前。。。。。");        ServletRequestAttributes attributes =(ServletRequestAttributes) RequestContextHolder.getRequestAttributes();        HttpServletRequest request = attributes.getRequest();        //url        logger.info("url={}",request.getRequestURL());        //ip        logger.info("ip={}",request.getRemoteAddr());        //method        logger.info("method={}",request.getMethod());        //类方法        logger.info("class_method={}",joinPoint.getSignature().getDeclaringTypeName()+"."+joinPoint.getSignature().getName());        //参数        logger.info("args={}",joinPoint.getArgs());    }    @After("log()")    public void doAfter(){       logger.info("调用方法后。。。。。。");    }    //return 后    @AfterReturning(returning = "object",pointcut = "log()")    public void doAfterReturning(Object object){        logger.info("response={}",object.toString());    }}

三、统一异常处理

1、定义统一的返回模型
package com.lei.domain;/** * 返回前台对象 */public class Result<T> {    /** 0为成功，1为失败*/    private Integer code;    private String msg;    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;    }}
返回对象模型的工具类
package com.lei.utils;import com.lei.domain.Result;/** * 返回结果的工具类 */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 error(Integer code,String msg){        Result result = new Result();        result.setCode(code);        result.setMsg(msg);        return result;    }}

2、定义自己的异常并统一捕获

1）定义异常枚举
package com.lei.enums;public enum ExceptionEnum {    UNKNOW_ERROR(-1,"未知错误"),    SUCCESS(0,"成功"),    XIAO_SCHOOL(100,"你还在上小学吧"),    MIDDLE_SCHOOL(101,"你在上初中吧");    private Integer code;    private String msg;    ExceptionEnum(Integer code, String msg) {        this.code = code;        this.msg = msg;    }    public Integer getCode() {        return code;    }    public String getMsg() {        return msg;    }}

2）定义自己的异常类
package com.lei.exception;import com.lei.enums.ExceptionEnum;/** * Girl的异常类 */public class GirlException extends RuntimeException{    private Integer code;    public GirlException(ExceptionEnum exceptionEnum) {        super(exceptionEnum.getMsg());        this.code = exceptionEnum.getCode();    }    public Integer getCode() {        return code;    }    public void setCode(Integer code) {        this.code = code;    }}

3）捕获异常的Handler
package com.lei.handler;import com.lei.domain.Result;import com.lei.enums.ExceptionEnum;import com.lei.exception.GirlException;import com.lei.utils.ResultUtil;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.web.bind.annotation.ControllerAdvice;import org.springframework.web.bind.annotation.ExceptionHandler;import org.springframework.web.bind.annotation.ResponseBody;/** * 异常类的Handler */@ControllerAdvicepublic class ExceptionHandle {    private static final Logger logger = LoggerFactory.getLogger(ExceptionHandle.class);    @ExceptionHandler(value = Exception.class)    @ResponseBody    public Result getAgeHandle(Exception e){        if (e instanceof GirlException){            GirlException girlException = (GirlException)e;            return ResultUtil.error(girlException.getCode(),girlException.getMessage());        }else {            logger.info("系统异常：{}",e);            throw  new GirlException(ExceptionEnum.UNKNOW_ERROR);        }    }}
4) service层使用异常类
public void getAge(Integer id) throws Exception{        Girl girl = girlRepository.findOne(id);        Integer age = girl.getAge();        //验证，如果年龄太小就给前端返回信息        if (age<10){            throw new GirlException(ExceptionEnum.XIAO_SCHOOL);        }else if (age>10&&age<16){            throw new GirlException(ExceptionEnum.MIDDLE_SCHOOL);        }                //验证通过之后,做下面的逻辑....            }


四、单元测试


测试Service层的用例
package com.lei.service;import org.junit.Assert;import org.junit.Test;import org.junit.runner.RunWith;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.boot.test.context.SpringBootTest;import org.springframework.test.context.junit4.SpringRunner;import static org.junit.Assert.*;@RunWith(SpringRunner.class)@SpringBootTestpublic class GirlServiceTest {    @Autowired    private GirlService girlService;    @Test    public void findOneAge() throws Exception {        Assert.assertEquals(new Integer(12),girlService.findOneAge(1));    }}

测试Controller层的用例
package com.lei.controller;import org.junit.Test;import org.junit.runner.RunWith;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;import org.springframework.boot.test.context.SpringBootTest;import org.springframework.test.context.junit4.SpringRunner;import org.springframework.test.web.servlet.MockMvc;import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;import org.springframework.test.web.servlet.result.MockMvcResultMatchers;import static org.junit.Assert.*;@RunWith(SpringRunner.class)@SpringBootTest@AutoConfigureMockMvcpublic class GirlControllerTest {    @Autowired    private MockMvc mvc;    @Test    public void getAll() throws Exception {        mvc.perform(MockMvcRequestBuilders.get("/girl/getAll"))                .andExpect(MockMvcResultMatchers.status().isOk())//判断链接是否可以访问                .andExpect(MockMvcResultMatchers.content().string("123456"));//判断返回的内容是不是我们想要的    }}

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