重要组件
准备Model,Controller
java
@Configuration
public class WebConfig {
@ControllerAdvice
static class MyControllerAdvice {
@ModelAttribute("b")
public String bar() {
return "bar";
}
}
@Controller
static class Controller1 {
@ResponseStatus(HttpStatus.OK) // 添加此注解 这里不测试返回值处理器
public ModelAndView foo(@ModelAttribute("u") User user) {
System.out.println("Controller1.foo");
System.out.println("user = " + user);
return null;
}
}
@Data
static class User {
private String name;
}
}
准备参数解析器
java
private static HandlerMethodArgumentResolverComposite argumentResolverComposite(AnnotationConfigApplicationContext annotationConfigApplicationContext) {
DefaultListableBeanFactory beanFactory = annotationConfigApplicationContext.getDefaultListableBeanFactory();
HandlerMethodArgumentResolverComposite resolverComposite = new HandlerMethodArgumentResolverComposite();
resolverComposite.addResolvers(
// @RequestParam参数解析器 false表示参数上必须有注解才会解析
new RequestParamMethodArgumentResolver(beanFactory, false),
// @PathVariable
new PathVariableMethodArgumentResolver(),
// @RequestHeader
new RequestHeaderMethodArgumentResolver(beanFactory),
// @CookieValue
new ServletCookieValueMethodArgumentResolver(beanFactory),
// Spring表达式参数解析器
new ExpressionValueMethodArgumentResolver(beanFactory),
// HttpServletRequest
new ServletRequestMethodArgumentResolver(),
// 是否不需要注解@ModelAttribute false:需要 即没有@ModelAttribute的实体参数不解析
new ServletModelAttributeMethodProcessor(false),
// @RequestBody
new RequestResponseBodyMethodProcessor(CollUtil.newArrayList(new MappingJackson2HttpMessageConverter())),
/**
*是否不需要注解@ModelAttribute true:不需要 即没有@ModelAttribute的实体参数也解析
* 注意!!! 这个解析器必须放在@RequestBody解析器后面,否则这个解析器将会优先被使用去解析
*/
new ServletModelAttributeMethodProcessor(true),
/**
* @RequestParam 参数解析器 true表示参数上没有注解也会解析
* 注意!!! 这个解析器必须放在后面 否则其它类型参数将使用这个解析器解析
*/
new RequestParamMethodArgumentResolver(beanFactory, true)
);
return resolverComposite;
}
测试MVC流程
java
// 1. 准备容器
AnnotationConfigApplicationContext applicationContext = new AnnotationConfigApplicationContext(WebConfig.class);
// 2. 准备RequestMappingHandlerAdapter 测试:获取模型工厂并获取初始化时配置在ControllerAdvice中的模型数据
RequestMappingHandlerAdapter requestMappingHandlerAdapter = new RequestMappingHandlerAdapter();
requestMappingHandlerAdapter.setApplicationContext(applicationContext);
requestMappingHandlerAdapter.afterPropertiesSet();
Method getModelFactoryMethod = RequestMappingHandlerAdapter.class.getDeclaredMethod("getModelFactory", HandlerMethod.class, WebDataBinderFactory.class);
getModelFactoryMethod.setAccessible(true);
// 3. 准备请求
MockHttpServletRequest mockHttpServletRequest = new MockHttpServletRequest();
mockHttpServletRequest.setParameter("name", "zhoujunlin");
ServletWebRequest servletWebRequest = new ServletWebRequest(mockHttpServletRequest);
// 4. 准备servletInvocableHandlerMethod
ServletInvocableHandlerMethod servletInvocableHandlerMethod = new ServletInvocableHandlerMethod(new Controller1(), Controller1.class.getDeclaredMethod("foo", WebConfig.User.class));
// 这里没有特殊参数绑定 入参传null
ServletRequestDataBinderFactory servletRequestDataBinderFactory = new ServletRequestDataBinderFactory(null, null);
servletInvocableHandlerMethod.setDataBinderFactory(servletRequestDataBinderFactory);
servletInvocableHandlerMethod.setParameterNameDiscoverer(new DefaultParameterNameDiscoverer());
servletInvocableHandlerMethod.setHandlerMethodArgumentResolvers(argumentResolverComposite(applicationContext));
// 暂不研究返回值处理器
// 5. 准备ModelAndViewContainer容器
ModelAndViewContainer modelAndViewContainer = new ModelAndViewContainer();
// 6. 获取模型工厂并初始化模型数据
ModelFactory modelFactory = (ModelFactory) getModelFactoryMethod.invoke(requestMappingHandlerAdapter, servletInvocableHandlerMethod, servletRequestDataBinderFactory);
modelFactory.initModel(servletWebRequest, modelAndViewContainer, servletInvocableHandlerMethod);
// 7. 方法执行
servletInvocableHandlerMethod.invokeAndHandle(
servletWebRequest,
modelAndViewContainer);
System.out.println("modelAndViewContainer.getModel() = " + modelAndViewContainer.getModel());
// 8. 关闭容器
applicationContext.close();