SpringBoot进阶使用

package com.example.helloworld.controller;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;
import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.io.IOException;
import java.util.Date;
@RestController
public class FileUploadController {
    @PostMapping("/upload")
    // 上面这行等价于 @RequestMapping(value = "/upload", method = RequestMethod.POST)
    public String up(String nickname, MultipartFile photo, HttpServletRequest request) throws IOException {
        System.out.println(nickname);
        // 获取图片的原始名称
        System.out.println(photo.getOriginalFilename());
        // 取文件类型
        System.out.println(photo.getContentType());
        // HttpServletRequest 获取web服务器的路径(可动态获取)
        String path = request.getServletContext().getRealPath("/upload/");
        System.out.println(path);
        saveFile(photo, path);
        return "上传成功";
    }
    //
    public void saveFile(MultipartFile photo, String path) throws IOException {
        //  判断存储的目录是否存在，如果不存在则创建
        File dir = new File(path);
        if (!dir.exists()) {
            //  创建目录
            dir.mkdir();
        }
        // 调试时可以把这个路径写死
        File file = new File(path + photo.getOriginalFilename());
        photo.transferTo(file);
    }
}

package com.example.helloworld.interceptor;
import org.springframework.web.servlet.HandlerInterceptor;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class LoginInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("LoginInterceptor拦截！！！");
        return true;
    }
}

package com.example.helloworld.config;
import com.example.helloworld.interceptor.LoginInterceptor;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
@Configuration
public class WebConfig implements WebMvcConfigurer {
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new LoginInterceptor()).addPathPatterns("/user/**");
    }
}

package com.example.helloworld.controller;
import com.example.helloworld.entity.User;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import org.springframework.web.bind.annotation.*;
@RestController
public class UserController {
    @ApiOperation("获取用户")
    @GetMapping("/user/{id}")
    public String getUserById(@PathVariable int id) {  // 想拿到路径上的动态参数，需要加@PathVariable 注解
        System.out.println(id);
        return "根据ID获取用户信息";
    }
    @PostMapping("/user")
    public String save(User user) {
        return "添加用户";
    }
    @PutMapping("/user")
    public String update(User user) {
        return "更新用户";
    }
    @DeleteMapping("/user/{id}")
    public String deleteById(@PathVariable int id) {
        System.out.println(id);
        return "根据ID删除用户";
    }
}

    <!-- 添加swagger2相关功能 -->
    <dependency>
        <groupId>io.springfox</groupId>
        <artifactId>springfox-swagger2</artifactId>
        <version>2.9.2</version>
    </dependency>
    <!-- 添加swagger-ui相关功能 -->
    <dependency>
        <groupId>io.springfox</groupId>
        <artifactId>springfox-swagger-ui</artifactId>
        <version>2.9.2</version>
    </dependency>

package com.example.helloworld.config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import springfox.documentation.builders.ApiInfoBuilder;
import springfox.documentation.builders.PathSelectors;
import springfox.documentation.builders.RequestHandlerSelectors;
import springfox.documentation.service.ApiInfo;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;
import springfox.documentation.swagger2.annotations.EnableSwagger2;
@Configuration // 告诉Spring容器，这个类是一个配置类(SB的配置类，都需要加上@Configuration这个注解)
@EnableSwagger2 // 启用Swagger2功能
public class SwaggerConfig {
    /**
     * 配置Swagger2相关的bean
     */
    @Bean
    public Docket createRestApi() {
        return new Docket(DocumentationType.SWAGGER_2)
                .apiInfo(apiInfo()) // 调用了一个自定义方法(改改标题啥的~)
                .select()
                .apis(RequestHandlerSelectors.basePackage("com"))// com包下所有API都交给Swagger2管理
                .paths(PathSelectors.any()).build();
    }
    /**
     * 此处主要是API文档页面显示信息
     */
    private ApiInfo apiInfo() {
        return new ApiInfoBuilder()
                .title("爽哥提示：演示项目API") // 标题
                .description("爽哥提示：演示项目") // 描述
                .version("1.0") // 版本
                .build();
    }
}