spring和springmvc纯注解整合

忘是亡心i 2022-01-26 02:35 333阅读 0赞

首先在idea创建一个jar工程，不需要去创建任何配置文件，也包括web.xml

首先写spring的配置类

package com.liy.config;
    
    import org.springframework.context.annotation.ComponentScan;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.context.annotation.FilterType;
    import org.springframework.stereotype.Controller;
    
    /**
    *spring配置文件类
    *
    *configuration   此注解标明配置类的身份
    *下面的步骤相当于xml配置文件中的开启spring扫描，开启默认注解，不过排除掉controller注解
    */
    @Configuration
    @ComponentScan(basePackages = "com.liy",useDefaultFilters = true,
        excludeFilters = {@ComponentScan.Filter(type = FilterType.ANNOTATION,
                classes = Controller.class)})
    public class SpringConfig {
    }

然后是springmvc的配置类

package com.liy.config;
    
    import com.alibaba.fastjson.support.config.FastJsonConfig;
    import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter;
    import org.omg.CosNaming.NamingContextExtPackage.AddressHelper;
    import org.springframework.context.annotation.ComponentScan;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.context.annotation.FilterType;
    import org.springframework.http.converter.HttpMessageConverter;
    import org.springframework.stereotype.Controller;
    import org.springframework.web.context.WebApplicationContext;
    import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
    import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
    import org.springframework.web.servlet.config.annotation.ViewResolverRegistry;
    import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;
    
    import java.nio.charset.Charset;
    import java.util.List;
    
    /**
     *springmvc 配置文件类
     */
    @Configuration
    @ComponentScan(basePackages = "com.liy",
     useDefaultFilters = false,
     includeFilters = {@ComponentScan.Filter(type = FilterType.ANNOTATION,
     classes = Controller.class),
     @ComponentScan.Filter(type = FilterType.ANNOTATION,
     classes = Configuration.class)})
    public class SpringMVCConfig extends WebMvcConfigurationSupport {
            //把根目录下的静态资源放开，不过访问静态资源时，请求路径前要加上“/js/”
            @Override
            protected void addResourceHandlers(ResourceHandlerRegistry registry) {
                    registry.addResourceHandler("/js/**").addResourceLocations("classpath:/");
            }
     
            //给访问jsp的请求加上前缀（“/”） 和后缀 (".jsp")
            @Override
            protected void configureViewResolvers(ViewResolverRegistry registry) {
                    registry.jsp("/",".jsp");
            }
    
            //这里表示，访问/hello3路径后，进入名为hello的视图去
            @Override
            protected void addViewControllers(ViewControllerRegistry registry) {
                    registry.addViewController("/hello3").setViewName("hello");
            }
    
    
            //加了fastjson的依赖后，这里配置引用fastjson，以及设置编码
            @Override
            protected void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
    
                    FastJsonHttpMessageConverter converter = new FastJsonHttpMessageConverter();
                    converter.setDefaultCharset(Charset.forName("UTF-8"));
    
                    FastJsonConfig config = new FastJsonConfig();
                    config.setCharset(Charset.forName("UTF-8"));
    
                    converter.setFastJsonConfig(config);
    
                    converters.add(converter);
            }
    }

再写个初始化的类，相当于web.xml，启动项目就加载配置文件

package com.liy.config;
    
    import org.springframework.web.WebApplicationInitializer;
    import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
    import org.springframework.web.servlet.DispatcherServlet;
    
    import javax.servlet.ServletContext;
    import javax.servlet.ServletException;
    import javax.servlet.ServletRegistration;
    
    /**
     * 相当于web.xml
     *
     */
    public class WebInit implements WebApplicationInitializer {
        @Override
        public void onStartup(ServletContext servletContext) throws ServletException {
            //扫描springmvc
            AnnotationConfigWebApplicationContext afw =
                    new AnnotationConfigWebApplicationContext();
            afw.register(SpringMVCConfig.class);
            //添加dispatchservlet
            ServletRegistration.Dynamic springmvc = servletContext.addServlet("springmvc", new DispatcherServlet(afw));
    
            //添加映射文件路径
            springmvc.addMapping("/");
    
            //给springmvc添加启动时机
            springmvc.setLoadOnStartup(1);
        }
    }

注意这个相当于web.xml的类这能扫描springmvc的配置类，所以要把spring的配置类的注解类型加到springmvc的扫描中

@ComponentScan.Filter(type = FilterType.ANNOTATION, classes = Configuration.class)

这样spring和springmvc的纯java注解方式就整合完成了

其实spring的配置类可以省略 ，只要springmvc的配置类扫描所有地方就行

@Configuration
    @ComponentScan(basePackages = "com.liy")
    public class SpringMVCConfig extends WebMvcConfigurationSupport {

这样spring的配置类就不需要了

然后写个controller类测试下

@Controller
    public class HelloController {
        @Autowired
        HelloService hs;
        @GetMapping(value = "/hello",produces = "text/html;charset=utf-8")
        @ResponseBody
        public String Hello(String name) {
    
            return hs.hello(name);
        }

页面能看到数据就表示成功了