IDEA快速搭建前后端分离springboot项目综合篇

古城微笑少年丶 2023-10-07 16:01 47阅读 0赞

## IDEA教程 ##

链接: [IntelliJ IDEA 简体中文专题教程][IntelliJ IDEA].

链接: [Java 单体服务开发指南][Java].

## 创建基础项目 ##

### 1.创建项目 ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNjA0ODkw_size_16_color_FFFFFF_t_70]  
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一路next，选择项目存放路径后点击finish完成，等待依赖下载完成  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNjA0ODkw_size_16_color_FFFFFF_t_70 2]  
删除没必要的文件（选中的红色）  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNjA0ODkw_size_16_color_FFFFFF_t_70 3]

### 项目结构 ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNjA0ODkw_size_16_color_FFFFFF_t_70 4]

### 导入web依赖 ###

<dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

### yml配置 ###

删除 application.properties
    新建 application.yml

server:
      port: 8080

### 编写TestController测试项目 ###

package com.zm.demo.controller;
    
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.PostMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    @RestController
    public class TestController {
        
    
        @GetMapping("hello")
        public String helloGet() {
        
            return "get hello world！";
        }
    
        @PostMapping("hello")
        public String helloPost() {
        
            return "post hello world！";
        }
    
    }

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNjA0ODkw_size_16_color_FFFFFF_t_70 5]  
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## 统一参数回调 ##

package com.zm.demo.common;
    
    import java.io.Serializable;
    
    public class ApiResult<T> implements Serializable {
        
    
        private T data;
    
        private Integer code;
    
        private String msg;
        
        /**
         * 请求成功回调
         */
        public static ApiResult successMsg() {
        
            return new ApiResult().setCode(200).setMsg("ok");
        }
    
        /**
         * 请求成功回调
         * @param Object 对象参数
         */
        public static ApiResult successMsg(Object Object) {
        
            return new ApiResult().setCode(200).setMsg("ok").setData(Object);
        }
    
        /**
         * 请求失败回调
         * @param code 状态码
         * @param msg 描述信息
         */
        public static ApiResult errorMsg(Integer code, String msg) {
        
            return new ApiResult().setCode(code).setMsg(msg);
        }
    
        /**
         * 请求失败回调
         *  @param msg 描述信息
         */
        public static ApiResult errorMsg(String msg) {
        
            return new ApiResult().setCode(500).setMsg(msg);
        }
    
        public T getData() {
        
            return data;
        }
    
        public Integer getCode() {
        
            return code;
        }
    
        public String getMsg() {
        
            return msg;
        }
    
        public ApiResult<T> setData(T data) {
        
            this.data = data;
            return this;
        }
    
        public ApiResult<T> setCode(Integer code) {
        
            this.code = code;
            return this;
        }
    
        public ApiResult<T> setMsg(String msg) {
        
            this.msg = msg;
            return this;
        }
        
    }

## 整合Swagger-knife4j接口文档 ##

### pom.xml配置依赖 ###

<dependencies>
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>fastjson</artifactId>
                <version>1.2.49</version>
            </dependency>
            <dependency>
                <groupId>io.swagger</groupId>
                <artifactId>swagger-annotations</artifactId>
                <version>1.5.22</version>
            </dependency>
            <dependency>
                <groupId>com.github.xiaoymin</groupId>
                <artifactId>knife4j-spring-boot-starter</artifactId>
                <version>2.0.4</version>
            </dependency>
        </dependencies>

package com.zm.demo.config;
    
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.core.env.Environment;
    import org.springframework.core.env.Profiles;
    import springfox.documentation.builders.ApiInfoBuilder;
    import springfox.documentation.builders.PathSelectors;
    import springfox.documentation.builders.RequestHandlerSelectors;
    import springfox.documentation.service.ApiInfo;
    import springfox.documentation.service.Contact;
    import springfox.documentation.spi.DocumentationType;
    import springfox.documentation.spring.web.plugins.Docket;
    import springfox.documentation.swagger2.annotations.EnableSwagger2;
    
    @Configuration
    @EnableSwagger2
    public class SwaggerConfig {
        
    
        @Bean
        public Docket docket(Environment environment) {
        
            return docket("测试demo", "com.zm.demo.controller",environment);
        }
    
        private Docket docket(String groupName, String basePackage,Environment environment) {
        
            return new Docket(DocumentationType.SWAGGER_2)
                    //enable配置是否启用Swagger，如果是false，在浏览器将无法访问
                    .enable(environment.acceptsProfiles(Profiles.of("dev", "test")))
                    .groupName(groupName)
                    .apiInfo(apiInfo())
                    .select()
                    .apis(RequestHandlerSelectors.basePackage(basePackage))
                    .paths(PathSelectors.any())
                    .build();
        }
    
        private ApiInfo apiInfo() {
        
            return new ApiInfoBuilder()
                    .title("title")
                    .description("description")
                    .license("license")
                    .licenseUrl("licenseUrl")
                    .termsOfServiceUrl("termsOfServiceUrl")
                    .contact(new Contact("name", "url", "email"))
                    .version("version")
                    .build();
        }
    
    }

package com.zm.demo.config;
    
    import com.alibaba.fastjson.JSON;
    import com.alibaba.fastjson.serializer.SerializerFeature;
    import com.alibaba.fastjson.support.config.FastJsonConfig;
    import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.http.MediaType;
    import org.springframework.http.converter.HttpMessageConverter;
    import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
    import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
    
    import java.nio.charset.Charset;
    import java.util.ArrayList;
    import java.util.List;
    
    @Configuration
    public class HttpConverterConfig implements WebMvcConfigurer {
        
    
        /**
         * 配置Swagger静态资源访问
         */
        @Override
        public void addResourceHandlers(ResourceHandlerRegistry registry) {
        
            registry.addResourceHandler("doc.html").addResourceLocations("classpath:/META-INF/resources/");
            registry.addResourceHandler("/webjars/**").addResourceLocations("classpath:/META-INF/resources/webjars/");
        }
    
        /**
         * 使用阿里 FastJson 作为JSON MessageConverter
         */
        @Override
        public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        
            FastJsonHttpMessageConverter converter = new FastJsonHttpMessageConverter();
            List<MediaType> supportedMediaTypes = new ArrayList<>();
            supportedMediaTypes.add(MediaType.APPLICATION_JSON);
            supportedMediaTypes.add(MediaType.APPLICATION_JSON_UTF8);
            supportedMediaTypes.add(MediaType.APPLICATION_ATOM_XML);
            supportedMediaTypes.add(MediaType.APPLICATION_FORM_URLENCODED);
            supportedMediaTypes.add(MediaType.APPLICATION_OCTET_STREAM);
            supportedMediaTypes.add(MediaType.APPLICATION_PDF);
            supportedMediaTypes.add(MediaType.APPLICATION_RSS_XML);
            supportedMediaTypes.add(MediaType.APPLICATION_XHTML_XML);
            supportedMediaTypes.add(MediaType.APPLICATION_XML);
            supportedMediaTypes.add(MediaType.IMAGE_GIF);
            supportedMediaTypes.add(MediaType.IMAGE_JPEG);
            supportedMediaTypes.add(MediaType.IMAGE_PNG);
            supportedMediaTypes.add(MediaType.TEXT_EVENT_STREAM);
            supportedMediaTypes.add(MediaType.TEXT_HTML);
            supportedMediaTypes.add(MediaType.TEXT_MARKDOWN);
            supportedMediaTypes.add(MediaType.TEXT_PLAIN);
            supportedMediaTypes.add(MediaType.TEXT_XML);
            converter.setSupportedMediaTypes(supportedMediaTypes);
            converter.setDefaultCharset(Charset.forName("UTF-8"));
            FastJsonConfig config = new FastJsonConfig();
            JSON.DEFFAULT_DATE_FORMAT = "yyyy-MM-dd HH:mm:ss";
            config.setSerializerFeatures(SerializerFeature.WriteDateUseDateFormat);//格式化时间
            converter.setFastJsonConfig(config);
            // 把FastJsonHttpMessageConverter放到Jackson的前面去
            // 这个list是个ArrayList 所以我们要么就放在首位（不建议）,
            // 而converters.indexOf() 因为人家是new的 所以肯定是找不到此对象的位置的 所以采用遍历的方式吧
            int jacksonIndex = 0;
            for (int i = 0; i < converters.size(); i++) {
        
                if (converters.get(i) instanceof MappingJackson2HttpMessageConverter) {
        
                    jacksonIndex = i;
                    break;
                }
            }
            // 添加在前面
            converters.add(jacksonIndex, converter);
        }
    }

### ApiResult加上Swagger注解 ###

@ApiModelProperty(value = "响应体")
        private T data;
        
        @ApiModelProperty(value = "状态码")
        private Integer code;
        
        @ApiModelProperty(value = "描述信息")
        private String msg;

### 多环境yml配置 ###

![在这里插入图片描述][20210327095237582.png]  
application.yml

spring:
      profiles:
        active: dev

application-dev.yml

server:
      port: 8080

application-pro.yml

server:
      port: 8081

### 启动项目 访问 http://127.0.0.1:8080/doc.html ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNjA0ODkw_size_16_color_FFFFFF_t_70 7]  
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将application.yml中active 改为 pro 启动项目 访问 http://127.0.0.1:8080/doc.html  
enable配置是否启用Swagger成功  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNjA0ODkw_size_16_color_FFFFFF_t_70 9]

## 全局异常处理 ##

可将项目中需要统一处理的异常进行捕获，统一返回错误信息

package com.zm.demo.common;
    
    /**
     * 全局错误类枚举
     * 错误码为字符串类型，共 5 位，分成两个部分：错误产生来源+四位数字编号
     * 错误码分为一级宏观错误码、二级宏观错误码、三级宏观错误码。
     * 分别是：
     * A0001（用户端错误）
     * B0001（系统执行出错）
     * C0001（调用第三方服务出错）
     *
     */
    public enum ErrorCode {
        
    
        /**
         *系统异常
         */
        SYSTEM_ERROR("B0001","系统异常"),
    
        /**
         *用户登录失效
         */
        USER_LOGIN_INVALID("A0001","用户登录失效"),
    
        ;
    
        /**
         * 错误码
         */
        private String errorCode;
    
        /**
         * 错误码描述
         */
        private String errorMsg;
    
        ErrorCode(String errorCode, String errorMsg) {
        
            this.errorCode = errorCode;
            this.errorMsg = errorMsg;
        }
    
        public String getErrorCode() {
        
            return errorCode;
        }
    
        public void setErrorCode(String errorCode) {
        
            this.errorCode = errorCode;
        }
    
        public String getErrorMsg() {
        
            return errorMsg;
        }
    
        public void setErrorMsg(String errorMsg) {
        
            this.errorMsg = errorMsg;
        }
    }

package com.zm.demo.common;
    
    /**
     * 自定义业务异常类
     */
    public class BusinessRuntimeException extends RuntimeException {
        
    
        private static final long serialVersionUID = 7903308178033567233L;
    
        /**
         * 错误码
         */
        private String errorCode;
    
        /**
         * 错误码描述
         */
        private String errorMsg;
    
    
        public BusinessRuntimeException(String errorMsg) {
        
            this.errorCode = "500";
            this.errorMsg = errorMsg;
        }
    
        public BusinessRuntimeException(ErrorCode errorCode) {
        
            this.errorCode = errorCode.getErrorCode();
            this.errorMsg = errorCode.getErrorMsg();
        }
    
        public String getErrorCode() {
        
            return errorCode;
        }
    
        public void setErrorCode(String errorCode) {
        
            this.errorCode = errorCode;
        }
    
        public String getErrorMsg() {
        
            return errorMsg;
        }
    
        public void setErrorMsg(String errorMsg) {
        
            this.errorMsg = errorMsg;
        }
    }

package com.zm.demo.config;
    
    import com.zm.demo.common.ApiResult;
    import com.zm.demo.common.BusinessRuntimeException;
    import com.zm.demo.common.ErrorCode;
    import org.springframework.web.bind.annotation.ExceptionHandler;
    import org.springframework.web.bind.annotation.RestControllerAdvice;
    
    /**
     * 全局Controller层异常处理类
     * @RestControllerAdvice 和 @ControllerAdvice区别在于@RestControllerAdvice不需要加@ResponseBody
     */
    @RestControllerAdvice
    public class GlobalExceptionResolver {
        
    
        /**
         * 处理所有不可知异常
         * @param e 异常
         * @return json结果
         */
        @ExceptionHandler(Exception.class)
        public ApiResult handleException(Exception e) {
        
            e.printStackTrace();
            return ApiResult.errorMsg(ErrorCode.SYSTEM_ERROR);
        }
    
        /**
         * 处理所有业务异常
         * @param e 业务异常
         * @return  json结果
         */
        @ExceptionHandler(BusinessRuntimeException.class)
        public ApiResult handleOpdRuntimeException(BusinessRuntimeException e) {
        
            return ApiResult.errorMsg(e.getErrorMsg());
        }
    
    
    }

### ApiResult 中增加方法 ###

/**
     * 请求失败回调
     *  @param errorCode 错误枚举
     */
    public static ApiResult errorMsg(ErrorCode errorCode) {
        
        return new ApiResult().setCode(errorCode.getErrorCode()).setMsg(errorCode.getErrorMsg());
    }

### 修改TestController代码，进行测试 ###

@GetMapping("hello")
        public ApiResult helloGet() {
        
            String msg = "get hello world！";
            if(true){
        
                throw new BusinessRuntimeException("出现BusinessRuntimeException错误");
            }
            return ApiResult.successMsg(msg);
        }
    
        @PostMapping("hello")
        public ApiResult helloPost() {
        
            String msg = "post hello world！";
            if(true){
        
                throw new BusinessRuntimeException(ErrorCode.SYSTEM_ERROR);
            }
            return ApiResult.errorMsg(msg);
        }

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNjA0ODkw_size_16_color_FFFFFF_t_70 10]  
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## 参数校验 ##

### 导入依赖 ###

<dependency>
     	<groupId>org.hibernate</groupId>
     	<artifactId>hibernate-validator</artifactId>
    	<version>6.1.0.Final</version>
    </dependency>
    
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <version>1.18.8</version>
    </dependency>

package com.zm.demo.vo;
    
    import io.swagger.annotations.ApiModel;
    import io.swagger.annotations.ApiModelProperty;
    import lombok.Data;
    import org.hibernate.validator.constraints.Range;
    import javax.validation.constraints.NotNull;
    import javax.validation.constraints.Past;
    
    @ApiModel(value = "查询订单测试参数校验")
    @Data
    public class SelectOrderReq {
        
    
         /**
         * required = true 参数为必填
         */
        @ApiModelProperty(value = "订单号",required = true)
        @NotBlank(message = "订单号不能为空")
        private String orderNumber;
    
        @ApiModelProperty(value = "订单类型")
        @Range(min = 1,max = 3,message = "订单类型错误")
        private Integer orderType;
    
        @ApiModelProperty(value = "下单时间")
        @Past(message = "查询订单时间需在当前时间之前")
        private Date orderTime;
    
    }

### 在GlobalExceptionResolver新增参数校验异常处理 ###

/**
     *@RequestParam上校验失败-> 抛出ConstraintViolationException
     */
    @ExceptionHandler(value = ConstraintViolationException.class)
    public ApiResult error(ConstraintViolationException e) {
        
        String message = e.getConstraintViolations().stream().map(ConstraintViolation::getMessage).collect(Collectors.joining());
        return ApiResult.errorMsg(message);
    }
    
    /**
     *单独使用@Valid@Validated验证路径中请求实体校验失败后抛出的异常
     */
    @ExceptionHandler(BindException.class)
    public ApiResult BindExceptionHandler(BindException e) {
        
        String message = e.getBindingResult().getAllErrors().stream().map(DefaultMessageSourceResolvable::getDefaultMessage).collect(Collectors.joining());
        return ApiResult.errorMsg(message);
    }
    
    /**
     *@RequestBody上校验失败后抛出的异常
     */
    @ExceptionHandler(MethodArgumentNotValidException.class)
    public ApiResult MethodArgumentNotValidExceptionHandler(MethodArgumentNotValidException e) {
        
        String message = e.getBindingResult().getAllErrors().stream().map(DefaultMessageSourceResolvable::getDefaultMessage).collect(Collectors.joining());
        return ApiResult.errorMsg(message);
    }

package com.zm.demo.controller;
    
    import com.zm.demo.common.ApiResult;
    import com.zm.demo.common.BusinessRuntimeException;
    import com.zm.demo.vo.SelectOrderReq;
    import org.springframework.validation.annotation.Validated;
    import org.springframework.web.bind.annotation.*;
    
    import javax.validation.Valid;
    
    @RestController
    @Validated
    public class TestController {
        
    
        @PostMapping("hello")
        public ApiResult<SelectOrderReq> helloPost(@Valid @RequestBody SelectOrderReq req) {
        
            System.out.println(req);
            return ApiResult.successMsg(req);
        }
    
    }

### 使用Swagger进行接口测试 访问 http://127.0.0.1:8080/doc.html ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNjA0ODkw_size_16_color_FFFFFF_t_70 12]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNjA0ODkw_size_16_color_FFFFFF_t_70 13]  
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更多使用: [统一的全局异常处理和参数校验][Link 1].

## 会话认证(拦截器 和 aop 两种实现) ##

### 使用aop来实现session认证 ###

链接: [Cookie 和Session是什么？为什么要使用它们？][Cookie _Session].

#### 导入依赖 ####

<dependency>
        <groupId>org.aspectj</groupId>
        <artifactId>aspectjweaver</artifactId>
        <version>1.9.6</version>
    </dependency>

package com.zm.demo.aop;
    import lombok.Data;
    /**
     * 用户session
     */
    @Data
    public class UserSession {
        
    
        private Integer userId;
    
        private String username;
    }

package com.zm.demo.aop;
    
    import org.springframework.web.context.request.RequestContextHolder;
    import org.springframework.web.context.request.ServletRequestAttributes;
    
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpSession;
    
    /**
     * 统一操作session
     * session默认30分钟未操作则失效
     * session.setMaxInactiveInterval(7200); 
     * 过期参数单位是秒，即在7200秒没有活动后session将失效
     * 设置为-1将永不关闭。 
     */
    public class HttpSessionUtil {
        
    
        public static final String SESSION = "UserSession";
    
        /**
         * 保存用户Session
         */
        public static void setUserSession(UserSession userSession) {
        
            getSession().setAttribute(SESSION,userSession);
        }
        /**
         * 获取用户Session
         */
        public static UserSession getUserSession() {
        
            return (UserSession)getRequest().getSession().getAttribute(SESSION);
        }
    
        public static HttpSession getSession() {
        
            return getRequest().getSession();
        }
    
        public static HttpServletRequest getRequest() {
        
            ServletRequestAttributes requestAttributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
            return requestAttributes.getRequest();
        }
    
    }

package com.zm.demo.aop;
    
    import java.lang.annotation.ElementType;
    import java.lang.annotation.Retention;
    import java.lang.annotation.RetentionPolicy;
    import java.lang.annotation.Target;
    /**
     * 用户session认证注解
     */
    @Target({
         ElementType.PARAMETER, ElementType.METHOD })
    @Retention(RetentionPolicy.RUNTIME)
    public @interface SessionAuthentication {
        
        String description() default "";
    }

package com.zm.demo.aop;
    
    import com.zm.demo.common.BusinessRuntimeException;
    import com.zm.demo.common.ErrorCode;
    import org.aspectj.lang.JoinPoint;
    import org.aspectj.lang.annotation.After;
    import org.aspectj.lang.annotation.Aspect;
    import org.aspectj.lang.annotation.Before;
    import org.aspectj.lang.annotation.Pointcut;
    import org.aspectj.lang.reflect.MethodSignature;
    import org.springframework.core.annotation.Order;
    import org.springframework.stereotype.Component;
    import java.lang.reflect.Method;
    
    /**
     * 会话认证aop
     * 异常已经统一交由全局处理 这里无需处理异常
     */
    @Aspect
    @Component
    @Order(1)
    public class SessionAuthenticationAspect {
        
    
        /**
         *注解拦截
         */
        @Pointcut("@annotation(com.zm.demo.aop.SessionAuthentication)")
        public void aspect() {
        
        }
    
        /**
         * 前置通知
         */
        @Before("aspect()")
        public void doBefore(JoinPoint joinPoint){
        
            UserSession user = HttpSessionUtil.getUserSession();
            if (user == null) {
        
                throw new BusinessRuntimeException(ErrorCode.USER_LOGIN_INVALID);
            }
            System.out.println( user.getUsername()+  "访问接口： " + getControllerMethodDescription2(joinPoint));
        }
    
        /**
         * 后置通知 
         * 可以随时拓展加入用户日志记录
         */
        @After("aspect()")
        public void doAfter(JoinPoint joinPoint){
        
        }
    
        /**
         * 获取注解中对方法的描述信息
         */
        public static String getControllerMethodDescription2(JoinPoint joinPoint) {
        
            MethodSignature signature = (MethodSignature) joinPoint.getSignature();
            Method method = signature.getMethod();
            SessionAuthentication controllerLog = method.getAnnotation(SessionAuthentication.class);
            return controllerLog.description();
        }
    }

package com.zm.demo.controller;
    
    import com.zm.demo.aop.HttpSessionUtil;
    import com.zm.demo.aop.SessionAuthentication;
    import com.zm.demo.aop.UserSession;
    import com.zm.demo.common.ApiResult;
    import com.zm.demo.vo.SelectOrderReq;
    import org.springframework.validation.annotation.Validated;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.PostMapping;
    import org.springframework.web.bind.annotation.RequestBody;
    import org.springframework.web.bind.annotation.RestController;
    
    import javax.validation.Valid;
    
    @RestController
    @Validated
    public class TestController {
        
    
        @GetMapping("login")
        public ApiResult login() {
        
            System.out.println("login sessionId: " + HttpSessionUtil.getSession().getId());
            // 验证用户名和密码是否正确(省略)
            // 存入session
            UserSession userSession = new UserSession();
            userSession.setUserId(1);
            userSession.setUsername("小周同学~");
            HttpSessionUtil.setUserSession(userSession);
            return ApiResult.successMsg();
        }
    
        @GetMapping("hello")
        @SessionAuthentication(description = "hello get request")
        public ApiResult helloGet() {
        
            System.out.println("hello get sessionId: " + HttpSessionUtil.getSession().getId());
            return ApiResult.successMsg();
        }
    
        @PostMapping("hello")
        @SessionAuthentication(description = "hello post request")
        public ApiResult<SelectOrderReq> helloPost(@Valid @RequestBody SelectOrderReq req) {
        
            System.out.println("hello post sessionId: " + HttpSessionUtil.getSession().getId());
            return ApiResult.successMsg(req);
        }
    
    }

#### 未登录的情况下访问接口提示用户登录失效 ####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNjA0ODkw_size_16_color_FFFFFF_t_70 15]

#### 登录后访问接口，session一致 ####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNjA0ODkw_size_16_color_FFFFFF_t_70 16]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNjA0ODkw_size_16_color_FFFFFF_t_70 17]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNjA0ODkw_size_16_color_FFFFFF_t_70 18]

#### 前后端分离跨域设置 ####

链接: [springboot跨域请求解决方案][springboot].

##### 方式一：在controller上加入@CrossOrigin注解 #####

@CrossOrigin(origins = "http://xxx.com",
    		maxAge = 3600,
    		methods = {
        RequestMethod.GET, RequestMethod.POST})

##### 方式二：基于拦截器（推荐使用） #####

package com.zm.demo.config;
    
    import org.springframework.stereotype.Component;
    import org.springframework.web.servlet.HandlerInterceptor;
    import org.springframework.web.servlet.ModelAndView;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    /**
     * 跨域拦截器
     */
    @Component
    public class CorsInterceptor implements HandlerInterceptor {
        
        
        @Override
        public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        
            response.setContentType("textml;charset=UTF-8");
            response.setHeader("Access-Control-Allow-Origin", request.getHeader("Origin"));
            response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");
            response.setHeader("Access-Control-Max-Age", "3600");
            //Access-Control-Allow-Headers 这里为支持的请求头，如果有自定义的header字段请自己添加
            response.setHeader("Access-Control-Allow-Headers", "Origin, No-Cache, X-Requested-With, If-Modified-Since, Pragma, Last-Modified, Cache-Control, Expires, Content-Type, X-E4M-With, userId, token");
            response.setHeader("Access-Control-Allow-Credentials", "true");
            response.setHeader("XDomainRequestAllowed", "1");
            System.out.println("CorsInterceptor跨域拦截器");
            return true;
        }
    
        @Override
        public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        
    
    
        }
    
        @Override
        public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        
    
        }
    }

在实现WebMvcConfigurer接口的HttpConverterConfig类中注册拦截器

@Autowired
    private CorsInterceptor corsInterceptor;
    
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        
        //将CorsInterceptor拦截器添加进来
        registry.addInterceptor(corsInterceptor).addPathPatterns("/**");
    }

##### 方式三：在实现WebMvcConfigurer接口的HttpConverterConfig类中重写addCorsMappings（不推荐使用） #####

@Override
    public void addCorsMappings(CorsRegistry registry) {
        
        final String ORIGINS[] = new String[] {
         "GET", "POST", "PUT", "DELETE" };
        registry.addMapping("/**") // 所有的当前站点的请求地址，都支持跨域访问。
                // 当前端配置 withCredentials=true时, 后端配置Access-Control-Allow-Origin不能为*, 必须是相应地址
                // 将设置allowedOrigins替换成allowedOriginPatterns
                .allowedOriginPatterns("*")
                .allowCredentials(true) // 是否支持跨域用户凭证
                .allowedMethods(ORIGINS) // 当前站点支持的跨域请求类型是什么
                .maxAge(3600); // 超时时长设置为1小时。 时间单位是秒。
        System.out.println("addCorsMappings");
    }

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNjA0ODkw_size_16_color_FFFFFF_t_70 19]

### jwt(json web token) 和 自定义token ###

链接: [springboot整合JWT简单实现认证登陆][springboot_JWT].

### 整合spring security 实现用户认证 ###

链接: [ 整合spring security 实现用户认证][_spring security].

## 整合MyBatis-Plus ##

链接: [springboot整合MyBatis-Plus][springboot_MyBatis-Plus].

## 整合数据连接池Druid 和 Log4j2日志 ##

链接: [springboot 整合 Druid 及 Log4j2][springboot _ Druid _ Log4j2].

## 自定义starter ##

链接: [springboot自定义starter(十二)][springboot_starter].

## 图片上传 ##

链接: [springboot上传图片后访问图片的几种方式][springboot 1].

## 定时任务 ##

## 异步线程池 ##

## 邮件发送 ##

## Http请求客户端 ##

链接: [java实现调用Http请求常用的几种方式][java_Http].

## 编程规范 ##

关注公众号 阿里技术 下载最新java开发手册  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNjA0ODkw_size_16_color_FFFFFF_t_70 20]  
![在这里插入图片描述][20210327085613968.png]  
![在这里插入图片描述][20210327085541248.png]

[IntelliJ IDEA]: https://www.cntofu.com/book/143/introduce.md
[Java]: https://blog.csdn.net/zuozewei/article/details/118897201
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[Link 1]: https://blog.csdn.net/qq_41604890/article/details/109342092
[Cookie _Session]: https://www.jianshu.com/p/58d66eb287e5
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[springboot]: https://blog.csdn.net/qq_43486273/article/details/83272500
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[springboot_JWT]: https://blog.csdn.net/qq_41604890/article/details/111655961
[_spring security]: https://blog.csdn.net/qq_41604890/article/details/116464296
[springboot_MyBatis-Plus]: https://blog.csdn.net/qq_41604890/article/details/113617980
[springboot _ Druid _ Log4j2]: https://blog.csdn.net/qq_41604890/article/details/112999738
[springboot_starter]: https://blog.csdn.net/qq_41604890/article/details/115276164
[springboot 1]: https://blog.csdn.net/qq_41604890/article/details/114553632
[java_Http]: https://blog.csdn.net/qq_41604890/article/details/114760846
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[20210327085613968.png]: https://img-blog.csdnimg.cn/20210327085613968.png
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