springMVC基础使用（示例）

maven依赖（javax.servlet-api版本与spring-webmvc班恩要匹配不然会报java.lang.NoSuchMethodError: javax.servlet.http.HttpServletRespons······）：

  <dependencies>
        <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>
    </dependencies>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>
<!--    tomcat插件-->
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.tomcat.maven</groupId>
                <artifactId>tomcat7-maven-plugin</artifactId>
                <version>2.1</version>
                <configuration>
                    <port>8080</port>
                    <path>/</path>
                    <uriEncoding>UTF-8</uriEncoding>
                </configuration>
            </plugin>
        </plugins>
    </build>

controller类(访问路径：localhost:8080/user/save)：

@RestController
@RequestMapping("/user")
public class userController {

    @RequestMapping(value = "/save",method = RequestMethod.GET)
    public String save(){
        return "这是usersave";
    }
}

spring配置类：

@Configuration //定义为配置类
@ComponentScan("com.dt")//包扫描
@EnableWebMvc//开启SpringMvc的辅助功能
public class SpringConfig {

}

servlet类：

public class ServletContainerInitConfig extends AbstractDispatcherServletInitializer {
    @Override
    protected WebApplicationContext createServletApplicationContext() {
        AnnotationConfigWebApplicationContext applicationContext = new AnnotationConfigWebApplicationContext();
        applicationContext.register(spring配置类.class);
        return applicationContext;
    }

    @Override
    protected String[] getServletMappings() {
        return new String[]{"/"};
    }

    @Override
    protected WebApplicationContext createRootApplicationContext() {
        return null;
    }

    //设置参数编码为UTF-8
    @Override
    protected Filter[] getServletFilters() {
        CharacterEncodingFilter characterEncodingFilter = new CharacterEncodingFilter();
        characterEncodingFilter.setEncoding("UTF-8");
        return new Filter[]{characterEncodingFilter};
    }
}