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Springboot整合springmvc

news 2025/7/27 20:35:28

Springmvc的自动解管理

中央转发器（DispatcherServlet）

控制器

视图解析器

静态资源访问

消息转换器

格式化

静态资源管理

中央转发器

Xml无需配置

<servlet>
<servlet-name>chapter2</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>chapter2</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>

控制器

控制器Controller在springboot的注解扫描范围内自动管理。

视图解析器自动管理

Inclusion of ContentNegotiatingViewResolver and BeanNameViewResolver beans.

ContentNegotiatingViewResolver：组合所有的视图解析器的；

曾经的配置文件无需再配

<bean id="de" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/jsp/"></property>
<property name="suffix" value="*.jsp"></property>
</bean>

源码：

public ContentNegotiatingViewResolver viewResolver(BeanFactory beanFactory) {
ContentNegotiatingViewResolver resolver = new ContentNegotiatingViewResolver();
resolver.setContentNegotiationManager((ContentNegotiationManager)beanFactory.getBean(ContentNegotiationManager.class));
resolver.setOrder(-2147483648);
return resolver;
}

当我们做文件上传的时候我们也会发现multipartResolver是自动被配置好的

页面

<form action="/upload" method="post" enctype="multipart/form-data">
<input name="pic" type="file">
<input type="submit">
</form>

Controller

@ResponseBody
@RequestMapping("/upload")
public String upload(@RequestParam("pic")MultipartFile file, HttpServletRequest request){
    String contentType = file.getContentType();
    String fileName = file.getOriginalFilename();
/*System.out.println("fileName-->" + fileName);
    System.out.println("getContentType-->" + contentType);*/
    //String filePath = request.getSession().getServletContext().getRealPath("imgupload/");
    String filePath = "D:/imgup/";
try {
this.uploadFile(file.getBytes(), filePath, fileName);
    } catch (Exception e) {
// TODO: handle exception
    }

return "success";
}

public static void uploadFile(byte[] file, String filePath, String fileName) throws Exception {
    File targetFile = new File(filePath);
if(!targetFile.exists()){
        targetFile.mkdirs();
    }
    FileOutputStream out = new FileOutputStream(filePath+fileName);
    out.write(file);
    out.flush();
    out.close();
}

消息转换和格式化

格式化转换器的自动注册

Springboot扩展springmvc

我们可以来通过实现WebMvcConfigurer接口来扩展

在容器中注册视图控制器(请求转发)

@Configuration
public class MyMVCCofnig implements WebMvcConfigurer{
@Override
public void addViewControllers(ViewControllerRegistry registry) {
registry.addViewController("/tx").setViewName("success");
}

}

注册格式化器

用来可以对请求过来的日期格式化的字符串来做定制化。当然通过application.properties配置也可以办到。

@Override
public void addFormatters(FormatterRegistry registry) {
    registry.addFormatter(new Formatter<Date>() {
@Override
public String print(Date date, Locale locale) {
return null;
        }
@Override
public Date parse(String s, Locale locale) throws ParseException {
return new SimpleDateFormat("yyyy-MM-dd").parse(s);
        }
    });
}

消息转换器扩展fastjson

在pom.xml中引入fastjson

<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.47</version>
</dependency>

配置消息转换器，添加fastjson

@Override
public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
    FastJsonHttpMessageConverter fc = new FastJsonHttpMessageConverter();
    FastJsonConfig fastJsonConfig = new FastJsonConfig();
    fastJsonConfig.setSerializerFeatures(SerializerFeature.PrettyFormat);
    fc.setFastJsonConfig(fastJsonConfig);
    converters.add(fc);
}

在实体类上可以继续控制

public class User
{

private String username;

private String password;

private int age;

private int score;

private int gender;

@JSONField(format = "yyyy-MM-dd")
private Date date;

拦截器注册

创建拦截器

public class MyInterceptor implements HandlerInterceptor {
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("前置拦截");
return true;
    }
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("后置拦截");
    }
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("最终拦截");
    }
}

拦截器注册

@Override
public void addInterceptors(InterceptorRegistry registry) {
    registry.addInterceptor(new MyInterceptor())
            .addPathPatterns("/**")
            .excludePathPatterns("/hello2");
}