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······）：

  
        
            javax.servlet
            javax.servlet-api
            3.1.0
            provided
        
        
            org.springframework
            spring-webmvc
            5.2.10.RELEASE
        
    
 
    
        8
        8
        UTF-8
    
    
        
            
                org.apache.tomcat.maven
                tomcat7-maven-plugin
                2.1
                
                    8080
                    /
                    UTF-8
                
            
        
    

        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};
    }
}

                注意：要添加webapp文件夹否则Tomcat插件会启动异常

                Tomcat插件启动：