spring mvc 自动 映射方法名

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spring mvc 默认 映射路径为 方法名

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spring mvc 的具体用法 就不具体说明了。

首先是 用@Controller 标明类 ?@RequestMapping来标名具体的请求路径

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每个Controller 上面写标记一下 @Controller 和?@RequestMapping 问题不大

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Controller的每个方法都需要标注?@RequestMapping也没什么问题

问题是每个@RequestMapping必须指定路径。

个人觉得这个有些不必要。特殊情况下可以指定，非特殊情况下我觉得可以提供默认规则。

方法上指定一个@RequestMapping即可。如果没有指定value 那么 直接映射成方法名

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spring mvc 不比struts ?struts所有的描述 都在xml中。命名规则再混乱 ?页面上找到请求去xml中搜寻 怎么样都能很快的找到对应的action及方法

而spring mvc 不同。所有的配置都是分散的。指定在controller及具体的方法上。如果路径的映射不规范，前台一个请求出错了难以找到对应的处理类及方法

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下面看具体的实现。我这里用的是spring mvc 4

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很简单。重写一下RequestMappingHandlerMapping即可

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具体代码

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import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;

import org.springframework.core.annotation.AnnotationUtils;
import org.springframework.web.accept.ContentNegotiationManager;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.mvc.condition.ConsumesRequestCondition;
import org.springframework.web.servlet.mvc.condition.HeadersRequestCondition;
import org.springframework.web.servlet.mvc.condition.ParamsRequestCondition;
import org.springframework.web.servlet.mvc.condition.PatternsRequestCondition;
import org.springframework.web.servlet.mvc.condition.ProducesRequestCondition;
import org.springframework.web.servlet.mvc.condition.RequestCondition;
import org.springframework.web.servlet.mvc.condition.RequestMethodsRequestCondition;
import org.springframework.web.servlet.mvc.method.RequestMappingInfo;
import org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping;

public class MyRequestMappingHandlerMapping extends RequestMappingHandlerMapping {

	private boolean useSuffixPatternMatch = true;

	private boolean useTrailingSlashMatch = true;
	
	private ContentNegotiationManager contentNegotiationManager = new ContentNegotiationManager();

	private final List<String> fileExtensions = new ArrayList<String>();
	
	@Override
	protected RequestMappingInfo getMappingForMethod(Method method,
			Class<?> handlerType) {
		RequestMappingInfo info = null;
		RequestMapping methodAnnotation = AnnotationUtils.findAnnotation(method, RequestMapping.class);
		if (methodAnnotation != null) {
			RequestCondition<?> methodCondition = getCustomMethodCondition(method);
			info = createRequestMappingInfo(methodAnnotation, methodCondition,method);
			RequestMapping typeAnnotation = AnnotationUtils.findAnnotation(handlerType, RequestMapping.class);
			if (typeAnnotation != null) {
				RequestCondition<?> typeCondition = getCustomTypeCondition(handlerType);
				info = createRequestMappingInfo(typeAnnotation, typeCondition,method).combine(info);
			}
		}
		return info;
	}
	protected RequestMappingInfo createRequestMappingInfo(RequestMapping annotation, RequestCondition<?> customCondition,Method method) {
		String[] patterns = resolveEmbeddedValuesInPatterns(annotation.value());
		if(patterns!=null && (patterns.length == 0)){
			patterns= new String[]{method.getName().toLowerCase()};
		}
		return new RequestMappingInfo(
				new PatternsRequestCondition(patterns, getUrlPathHelper(), getPathMatcher(),
						this.useSuffixPatternMatch, this.useTrailingSlashMatch, this.fileExtensions),
				new RequestMethodsRequestCondition(annotation.method()),
				new ParamsRequestCondition(annotation.params()),
				new HeadersRequestCondition(annotation.headers()),
				new ConsumesRequestCondition(annotation.consumes(), annotation.headers()),
				new ProducesRequestCondition(annotation.produces(), annotation.headers(), this.contentNegotiationManager),
				customCondition);
	}
	
}

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? ? 老配置文件

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	<mvc:annotation-driven>
		<mvc:message-converters>
			<bean class="org.springframework.http.converter.StringHttpMessageConverter">
				<property name="supportedMediaTypes" value="text/html;charset=UTF-8" />
			</bean>
			<bean id="jsonHttpMessageConverter"
				class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
				<property name="supportedMediaTypes">
					<list>
						<value>text/plain;charset=UTF-8</value>
						<value>text/html;charset=UTF-8</value>
						<value>text/json;charset=UTF-8</value>
						<value>application/json;charset=UTF-8</value>
					</list>
				</property>
			</bean>
		</mvc:message-converters>
	</mvc:annotation-driven>

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? ? 新配置文件

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<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
		<property name="messageConverters">
			<list>
				<bean class="org.springframework.http.converter.StringHttpMessageConverter">
					<property name="supportedMediaTypes" value="text/html;charset=UTF-8" />
				</bean>
				<bean id="jsonHttpMessageConverter"
					class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
					<property name="supportedMediaTypes">
						<list>
							<value>text/plain;charset=UTF-8</value>
							<value>text/html;charset=UTF-8</value>
							<value>text/json;charset=UTF-8</value>
							<value>application/json;charset=UTF-8</value>
						</list>
					</property>
				</bean>
			</list>
		</property>
	</bean>
    <bean name=‘handlerMapping‘ class=‘com.idresschina.idress.model.web.MyRequestMappingHandlerMapping‘>
<!-- 	 <property name=‘useTrailingSlashMatch‘ value=‘false‘></property> -->
	</bean>

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? ?将老的配置文件替换成新配置文件

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@RequestMapping("index1")
	public String index1(){
		return "index1";
	}
	
	@RequestMapping
	@ResponseBody
	public String index2(){
		return "index2";
	}

? ?/index1 对应 index1()

? /index2 对应 index2() ??

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? ?2015-01-08 14:03:14,342 INFO [MyRequestMappingHandlerMapping] - <Mapped "{[/admin/index],methods=[],params=[],headers=[],consumes=[],produces=[],custom=[]}" onto public java.lang.String web.ctrl.AppCtrl.index()>

2015-01-08 14:03:14,354 INFO [MyRequestMappingHandlerMapping] - <Mapped "{[/admin/index2],methods=[],params=[],headers=[],consumes=[],produces=[],custom=[]}" onto public java.lang.String web.ctrl.AppCtrl.index2()>

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? spring3.1之后?? ?<mvc:annotation-driven> ?标签默认给你干了两件事

? ?注册?RequestMappingHandlerMapping和RequestMappingHandlerAdapter

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? spring3.1之前为DefaultAnnotationHandlerMapping 和 AnnotationMethodHandlerAdapter ?这两个类以不推荐使用

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