MVC接收请求教程

mvc接收各种请求

1-环境搭建

1.1-准备apifox发送请求

1.2-项目搭建

①创建Web骨架的Maven项目

​ --打开2023-IDEA ，选择New Project

​ --选择Maven Archetype

​ --注意点：Catalog默认就行了

​ --Archetype选择webapp

​ --JDK跟着黑马敲最好用11

②创建好以上包结构

③导入pom.xml坐标

 <dependencies><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>3.8.1</version><scope>test</scope></dependency><dependency><groupId>javax.servlet</groupId><artifactId>javax.servlet-api</artifactId><version>3.1.0</version><scope>provided</scope></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-webmvc</artifactId><version>5.2.10.RELEASE</version></dependency><dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.2.6</version></dependency><dependency><groupId>org.mybatis</groupId><artifactId>mybatis</artifactId><version>3.5.6</version></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>8.0.33</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-jdbc</artifactId><version>5.2.10.RELEASE</version></dependency><dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-databind</artifactId><version>2.9.0</version></dependency><dependency><groupId>org.mybatis</groupId><artifactId>mybatis-spring</artifactId><version>3.0.3</version></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><version>RELEASE</version><scope>provided</scope></dependency></dependencies>

④导入各种类，接口等

​ --config配置类

//ServletContainersInitConfig
public class ServletContainersInitConfig extends AbstractAnnotationConfigDispatcherServletInitializer {protected Class<?>[] getRootConfigClasses() {return new Class[]{SpringConfig.class};}protected Class<?>[] getServletConfigClasses() {return new Class[]{SpringMvcConfig.class};}protected String[] getServletMappings() {return new String[]{"/"};}@Overrideprotected Filter[] getServletFilters() {CharacterEncodingFilter charactFilter =  new CharacterEncodingFilter();charactFilter.setEncoding("UTF-8");return new Filter[]{charactFilter};}
}//SpringConfig
@Configuration
@ComponentScan(value = "com.bdqn",excludeFilters = @ComponentScan.Filter(type = FilterType.ANNOTATION, classes = Controller.class)) //排除注解类型，排除Controller.class
public class SpringConfig {
}//SpringMvcConfig
@Configuration //标识这是一个配置类
@ComponentScan("com.bdqn.controller") //对指定范围进行扫包，对容器注册Bean对象
@EnableWebMvc //@EnableWebMvc 的作用是将当前的配置类标识为 Spring MVC 的配置类，并通过自动配置和默认功能，为我们提供方便快捷的 Spring MVC 开发环境。
public class SpringMvcConfig {
}

​ --controller包

//UserController
@Controller
public class UserController {@RequestMapping("/save")@ResponseBodypublic String save(){System.out.println("user save ...");return "{'info':'springmvc'}";}//post带中文参数的接收@RequestMapping("/getUser")@ResponseBodypublic String getUser(String name,int age){System.out.println("姓名："+name);System.out.println("年龄："+age);return "{'name':'"+name+"','age':'"+age+"',}";}//post发送json数据的接收@RequestMapping("/getJson")@ResponseBodypublic String getJson(@RequestBody User user){System.out.println("姓名："+user.getName());System.out.println("年龄："+user.getAge());return "{'name':'"+user.getName()+"','age':'"+user.getAge()+"',}";}
}

​ --mapper包

public interface UserDao {@Insert("insert into tbl_user(name,age)values(#{name},#{age})")public void save(User user);
}

​ --pojo包

@Data
public class User {private Integer id;private String name;private Integer age;//setter..getter..toString略
}

​ --service包

public interface UserService {public void save(User user);
}

​ --impl

@Service
public class UserServiceImpl implements UserService {@Overridepublic void save(User user) {System.out.println("user service ...");}
}

2-请求参数

2.1-普通参数

①接口参数

请求类型--get请求地址--http://localhost/commonParamDifferentName?name=张三&age=18请求参数--name=张三&age=18请求名称：普通参数请求    

②接收代码

@RequestMapping("/commonParamDifferentName")
@ResponseBody
public String commonParamDifferentName(String userName , int age){System.out.println("普通参数传递 userName ==> "+userName);System.out.println("普通参数传递 age ==> "+age);return "{'module':'common param different name'}";
}

2.2-pojo参数

①接口参数

请求类型--post请求地址--http://localhost/pojoParam请求参数--name=张三&age=18请求名称：pojo参数请求    

②接收代码

//POJO参数：请求参数与形参对象中的属性对应即可完成参数传递
@RequestMapping("/pojoParam")
@ResponseBody
public String pojoParam(User user){System.out.println("pojo参数传递 user ==> "+user);return "{'module':'pojo param'}";
}