SpringMVC 请求调用流程源码解析

青旅半醒 2022-11-14 10:29 155阅读 0赞

# 前言 #

**描述：** springmvc相关文章如下：  
[【1】SpringMVC 入口及父子容器源码解析][1_SpringMVC]  
[【2】SpringMVC 请求调用流程源码解析][2_SpringMVC]

# 1 工程概述 #

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## 1.1 pom ##

<?xml version="1.0" encoding="UTF-8"?>
    <project xmlns="http://maven.apache.org/POM/4.0.0"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
    
        <packaging>war</packaging>
        <groupId>org.example</groupId>
        <artifactId>rosh-spring</artifactId>
        <version>1.0-SNAPSHOT</version>
    
        <properties>
            <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
            <maven.compiler.source>1.8</maven.compiler.source>
            <maven.compiler.target>1.8</maven.compiler.target>
            <spring.version>5.2.8.RELEASE</spring.version>
        </properties>
    
        <dependencies>
            
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-context</artifactId>
                <version>${ spring.version}</version>
            </dependency>
            
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-aspects</artifactId>
                <version>${ spring.version}</version>
            </dependency>
            
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-tx</artifactId>
                <version>${ spring.version}</version>
            </dependency>
            
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-webmvc</artifactId>
                <version>${ spring.version}</version>
            </dependency>
            
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-jdbc</artifactId>
                <version>${ spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <version>1.16.20</version>
            </dependency>
            
            <dependency>
                <groupId>javax.servlet</groupId>
                <artifactId>javax.servlet-api</artifactId>
                <version>3.1.0</version>
                <scope>provided</scope>
            </dependency>
            
            <dependency>
                <groupId>org.slf4j</groupId>
                <artifactId>slf4j-api</artifactId>
                <version>1.7.10</version>
            </dependency>
            <dependency>
                <groupId>ch.qos.logback</groupId>
                <artifactId>logback-classic</artifactId>
                <version>1.1.2</version>
            </dependency>
            <dependency>
                <groupId>ch.qos.logback</groupId>
                <artifactId>logback-core</artifactId>
                <version>1.1.2</version>
            </dependency>
            
            <dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <version>4.13</version>
            </dependency>
        </dependencies>
    
    
    </project>

## 1.2 配置文件 ##

public class RoshWebInitializer extends AbstractAnnotationConfigDispatcherServletInitializer { 
        /** * 父容器配置文件 */
        @Override
        protected Class<?>[] getRootConfigClasses() { 
            System.out.println("RoshWebInitializer invoke getRootConfigClasses");
            return new Class<?>[]{ SpringRootConfig.class};
        }
        /** * 子容器配置 */
        @Override
        protected Class<?>[] getServletConfigClasses() { 
            System.out.println("RoshWebInitializer invoke getServletConfigClasses");
            return new Class<?>[]{  SpringServletConfig.class};
        }
        /** *拦截请求(静态资源、js、css.......) */
        @Override
        protected String[] getServletMappings() { 
            return new String[]{ "/"};
        }
    }
    
    
    /** * 父容器配置文件，只扫描service */
    @Configuration
    @ComponentScan(value = "com.rosh.service")
    public class SpringRootConfig { 
    
    }
    
    
    /** * 子容器配置文件，仅仅扫描@Controller、@RestController */
    @Configuration
    @ComponentScan(value="com.rosh",includeFilters={ 
            @ComponentScan.Filter(type= FilterType.ANNOTATION,classes={ Controller.class, RestController.class})
    },useDefaultFilters=false)
    @EnableWebMvc
    public class SpringServletConfig { 
    
    }

## 1.3 service ##

@RestController
    @RequestMapping("/hello")
    public class HelloController { 
    
    
        @Autowired
        private HelloService helloService;
    
    
        @GetMapping("")
        public String printHello() { 
    
            return helloService.printHello();
        }
    
    
    }

## 1.4 Controller ##

## 1.5 启动tomcat ##

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# 2 DispatcherServlet #

**概述：** springmvc 核心类，在创建子容器时，创建DispatcherServlet，处理url请求、响应等。当web发起请求时，调用doDispatch方法。

(1) 根据request获取相应的HandlerExecutionChain（包含handlerMethod、拦截器等）
    (2) 根据handlerMethod获取相应的handlerAdapter(handler方法是具体调用)
    (3) 前置过滤
    (4) handlerAdapter.handler()具体调用
    (5) 中置过滤

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protected void doDispatch(HttpServletRequest request, HttpServletResponse response) throws Exception { 
    		HttpServletRequest processedRequest = request;
    		HandlerExecutionChain mappedHandler = null;
    		boolean multipartRequestParsed = false;
    
    		/** * 异步管理 */
    		WebAsyncManager asyncManager = WebAsyncUtils.getAsyncManager(request);
    
    		try { 
    			ModelAndView mv = null;
    			Exception dispatchException = null;
    
    			try { 
    				/** * 文件上传 */
    				processedRequest = checkMultipart(request);
    				multipartRequestParsed = (processedRequest != request);
    
    				/** * 【重点】 根据request 获取相应的HandlerExecutionChain */
    				// Determine handler for the current request.
    				mappedHandler = getHandler(processedRequest);
    				if (mappedHandler == null) { 
    					noHandlerFound(processedRequest, response);
    					return;
    				}
    
    
    				/** * 根据handler获取adapter */
    
    				// Determine handler adapter for the current request.
    				/** * 根据handlerMethod 获取相应的 handlerAdapter */
    				HandlerAdapter ha = getHandlerAdapter(mappedHandler.getHandler());
    
    				// Process last-modified header, if supported by the handler.
    				String method = request.getMethod();
    				boolean isGet = "GET".equals(method);
    				if (isGet || "HEAD".equals(method)) { 
    					long lastModified = ha.getLastModified(request, mappedHandler.getHandler());
    					if (new ServletWebRequest(request, response).checkNotModified(lastModified) && isGet) { 
    						return;
    					}
    				}
    
    				/** * 前置过滤 */
    				if (!mappedHandler.applyPreHandle(processedRequest, response)) { 
    					return;
    				}
    
    				// Actually invoke the handler.
    				/** * 具体调用Controller 方法 */
    				mv = ha.handle(processedRequest, response, mappedHandler.getHandler());
    
    				if (asyncManager.isConcurrentHandlingStarted()) { 
    					return;
    				}
    
    				applyDefaultViewName(processedRequest, mv);
    
    				/** * 中置过滤 */
    				mappedHandler.applyPostHandle(processedRequest, response, mv);
    			}
    			catch (Exception ex) { 
    				dispatchException = ex;
    			}
    			catch (Throwable err) { 
    				// As of 4.3, we're processing Errors thrown from handler methods as well,
    				// making them available for @ExceptionHandler methods and other scenarios.
    				dispatchException = new NestedServletException("Handler dispatch failed", err);
    			}
    			processDispatchResult(processedRequest, response, mappedHandler, mv, dispatchException);
    		}
    		catch (Exception ex) { 
    			triggerAfterCompletion(processedRequest, response, mappedHandler, ex);
    		}
    		catch (Throwable err) { 
    			triggerAfterCompletion(processedRequest, response, mappedHandler,
    					new NestedServletException("Handler processing failed", err));
    		}
    		finally { 
    			if (asyncManager.isConcurrentHandlingStarted()) { 
    				// Instead of postHandle and afterCompletion
    				if (mappedHandler != null) { 
    					mappedHandler.applyAfterConcurrentHandlingStarted(processedRequest, response);
    				}
    			}
    			else { 
    				// Clean up any resources used by a multipart request.
    				if (multipartRequestParsed) { 
    					cleanupMultipart(processedRequest);
    				}
    			}
    		}
    	}

# 3 mappedHandler 源码解析 #

概念：handlerMethod 具体处理方法
         requestMappingInfo @RequestMapping相关配置

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## 3.1 过程解析 ##

### 3.1.1 handlerMapping解析 ###

**描述：** handlerMapping解析，获取相应的HandlerExecutionChain  
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### 3.1.2 获取handlerMethod ###

**描述：** 根据request获取handlerMethod  
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**描述：** 根据uri获取相应的hadnlerMethod，核心方法。

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MTI1OTk5_size_16_color_FFFFFF_t_70 8]

@Nullable
    	protected HandlerMethod lookupHandlerMethod(String lookupPath, HttpServletRequest request) throws Exception { 
    		List<Match> matches = new ArrayList<>();
    		/** * 根据url获取mapping匹配关系 */
    		List<T> directPathMatches = this.mappingRegistry.getMappingsByUrl(lookupPath);
    
    		//如果mapping不为空
    		if (directPathMatches != null) { 
    
    			/** * 根据mapping、request匹配相应的handlerMethod */
    			addMatchingMappings(directPathMatches, matches, request);
    		}
    		if (matches.isEmpty()) { 
    			// No choice but to go through all mappings...
    			addMatchingMappings(this.mappingRegistry.getMappings().keySet(), matches, request);
    		}
    
    		/** * 如果matches不为空 */
    		if (!matches.isEmpty()) { 
    
    			//获取第一个方法
    			Match bestMatch = matches.get(0);
    			if (matches.size() > 1) { 
    				Comparator<Match> comparator = new MatchComparator(getMappingComparator(request));
    				matches.sort(comparator);
    				bestMatch = matches.get(0);
    				if (logger.isTraceEnabled()) { 
    					logger.trace(matches.size() + " matching mappings: " + matches);
    				}
    				if (CorsUtils.isPreFlightRequest(request)) { 
    					return PREFLIGHT_AMBIGUOUS_MATCH;
    				}
    				/** * 如果匹配多个方法，获取第二个，并且第二个和第一个一样，那么报异常 */
    				Match secondBestMatch = matches.get(1);
    				if (comparator.compare(bestMatch, secondBestMatch) == 0) { 
    					Method m1 = bestMatch.handlerMethod.getMethod();
    					Method m2 = secondBestMatch.handlerMethod.getMethod();
    					String uri = request.getRequestURI();
    					throw new IllegalStateException(
    							"Ambiguous handler methods mapped for '" + uri + "': {" + m1 + ", " + m2 + "}");
    				}
    			}
    			/** * request设置值 */
    			request.setAttribute(BEST_MATCHING_HANDLER_ATTRIBUTE, bestMatch.handlerMethod);
    			handleMatch(bestMatch.mapping, lookupPath, request);
    			return bestMatch.handlerMethod;
    		}
    		else { 
    			return handleNoMatch(this.mappingRegistry.getMappings().keySet(), lookupPath, request);
    		}
    	}

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## 3.2 初始化映射关系的建立 ##

**描述：** 在匹配过程中，AbstractHandlerMethodMapping.lookupHandlerMethod方法，根据uri获取requestMappingInfo、在根据requestMappingInfo获取handlerMethod，那么映射关系是如何建立的呢？

![afterPropertiesSet][]

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**描述：** 遍历所有的beanNames  
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**描述：** 如果当前类有Controller、RequestMapping注解，那么遍历所有方法，并且用getMappingForMethod进行方法匹配，如果匹配成功，创建RequestMappingInfo对象。  
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**描述：** 点进去，遍历方法，调用匿名函数进行方法匹配。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MTI1OTk5_size_16_color_FFFFFF_t_70 14]

**描述：** 匿名匹配源码解析，带有@RequestMapping注解的方法创建RequestMappingInfo对象，并且判断该类是否带有@RequestMapping，如果带有，那么进行合并，返回RequestMappingInfo对象。

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@Override
    	@Nullable
    	protected RequestMappingInfo getMappingForMethod(Method method, Class<?> handlerType) { 
    
    		/** * 带有@RequestMapping注解方法，然后注解里面的内容封装成对象 */
    		RequestMappingInfo info = createRequestMappingInfo(method);
    		if (info != null) { 
    
    			/** * 类上面的@RequestMapping注解也封装成对象 */
    			RequestMappingInfo typeInfo = createRequestMappingInfo(handlerType);
    			if (typeInfo != null) { 
    				/** * 把方法上面的注解属性结合到类上面的RequestMappingInfo对象中 */
    				info = typeInfo.combine(info);
    			}
    			String prefix = getPathPrefix(handlerType);
    			if (prefix != null) { 
    				info = RequestMappingInfo.paths(prefix).options(this.config).build().combine(info);
    			}
    		}
    		return info;
    	}

**描述：** 创建映射关系。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MTI1OTk5_size_16_color_FFFFFF_t_70 16]  
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public void register(T mapping, Object handler, Method method) { 
    			// Assert that the handler method is not a suspending one.
    			if (KotlinDetector.isKotlinType(method.getDeclaringClass())) { 
    				Class<?>[] parameterTypes = method.getParameterTypes();
    				if ((parameterTypes.length > 0) && "kotlin.coroutines.Continuation".equals(parameterTypes[parameterTypes.length - 1].getName())) { 
    					throw new IllegalStateException("Unsupported suspending handler method detected: " + method);
    				}
    			}
    			this.readWriteLock.writeLock().lock();
    			try { 
    				/** * 【1】 创建handlerMethod */
    				HandlerMethod handlerMethod = createHandlerMethod(handler, method);
    
    				/** * 【2】 验证唯一 */
    				validateMethodMapping(handlerMethod, mapping);
    
    				/** * 【3】创建映射，uri-> handlerMethod */
    				this.mappingLookup.put(mapping, handlerMethod);
    
    				List<String> directUrls = getDirectUrls(mapping);
    				for (String url : directUrls) { 
    
    					/** * 【4】 建立的是url 和 requestMappingInfo的映射 */
    					this.urlLookup.add(url, mapping);
    				}
    
    				String name = null;
    				if (getNamingStrategy() != null) { 
    					name = getNamingStrategy().getName(handlerMethod, mapping);
    					addMappingName(name, handlerMethod);
    				}
    
    				/** * 【5】 跨域 */
    				CorsConfiguration corsConfig = initCorsConfiguration(handler, method, mapping);
    				if (corsConfig != null) { 
    					this.corsLookup.put(handlerMethod, corsConfig);
    				}
    
    				this.registry.put(mapping, new MappingRegistration<>(mapping, handlerMethod, directUrls, name));
    			}
    			finally { 
    				this.readWriteLock.writeLock().unlock();
    			}
    		}

## 3.3 总结 ##

(1) AbstractHandlerMethodMapping 在依赖注入完成后调用afterPropertiesSet方法，会建立url->requestMappingInfo->handlerMethod的映射关系。  
(2) 当请求过来时，DispatcherServlet调用doDispatch方法处理，第一步根据handMapping获取相应的HandlerExecutionChain，其核心逻辑就是根据request获取requestMappingInfo，在根据requestMappingInfo获取handlerMethod最后封装成HandlerExecutionChain对象。

# 4 具体调用 #

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**描述：** 调用赋值

@Nullable
    	protected ModelAndView invokeHandlerMethod(HttpServletRequest request,
    			HttpServletResponse response, HandlerMethod handlerMethod) throws Exception { 
    
    		ServletWebRequest webRequest = new ServletWebRequest(request, response);
    		try { 
    			WebDataBinderFactory binderFactory = getDataBinderFactory(handlerMethod);
    			ModelFactory modelFactory = getModelFactory(handlerMethod, binderFactory);
    
    			/** * 获取可调用的方法 */
    			ServletInvocableHandlerMethod invocableMethod = createInvocableHandlerMethod(handlerMethod);
    
    			/** * 设置参数解析器 */
    			if (this.argumentResolvers != null) { 
    				invocableMethod.setHandlerMethodArgumentResolvers(this.argumentResolvers);
    			}
    
    			/** * 设置返回值解析器 */
    			if (this.returnValueHandlers != null) { 
    				invocableMethod.setHandlerMethodReturnValueHandlers(this.returnValueHandlers);
    			}
    
    			/** * 设置参数绑定工厂 */
    			invocableMethod.setDataBinderFactory(binderFactory);
    
    			/** * 设置参数名称解析类 */
    			invocableMethod.setParameterNameDiscoverer(this.parameterNameDiscoverer);
    
    			ModelAndViewContainer mavContainer = new ModelAndViewContainer();
    			mavContainer.addAllAttributes(RequestContextUtils.getInputFlashMap(request));
    			modelFactory.initModel(webRequest, mavContainer, invocableMethod);
    			mavContainer.setIgnoreDefaultModelOnRedirect(this.ignoreDefaultModelOnRedirect);
    
    			AsyncWebRequest asyncWebRequest = WebAsyncUtils.createAsyncWebRequest(request, response);
    			asyncWebRequest.setTimeout(this.asyncRequestTimeout);
    
    
    			/** * 异步 */
    			WebAsyncManager asyncManager = WebAsyncUtils.getAsyncManager(request);
    			asyncManager.setTaskExecutor(this.taskExecutor);
    			asyncManager.setAsyncWebRequest(asyncWebRequest);
    			asyncManager.registerCallableInterceptors(this.callableInterceptors);
    			asyncManager.registerDeferredResultInterceptors(this.deferredResultInterceptors);
    
    			if (asyncManager.hasConcurrentResult()) { 
    				Object result = asyncManager.getConcurrentResult();
    				mavContainer = (ModelAndViewContainer) asyncManager.getConcurrentResultContext()[0];
    				asyncManager.clearConcurrentResult();
    				LogFormatUtils.traceDebug(logger, traceOn -> { 
    					String formatted = LogFormatUtils.formatValue(result, !traceOn);
    					return "Resume with async result [" + formatted + "]";
    				});
    				invocableMethod = invocableMethod.wrapConcurrentResult(result);
    			}
    
    			/** * 【重点】方法调用 */
    			invocableMethod.invokeAndHandle(webRequest, mavContainer);
    			if (asyncManager.isConcurrentHandlingStarted()) { 
    				return null;
    			}
    
    			return getModelAndView(mavContainer, modelFactory, webRequest);
    		}
    		finally { 
    			webRequest.requestCompleted();
    		}
    	}

**描述：** 核心调用方法  
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[1_SpringMVC]: https://blog.csdn.net/qq_34125999/article/details/115273102
[2_SpringMVC]: https://blog.csdn.net/qq_34125999/article/details/115290357
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