如何实现@RequestMapping自定义属性

作为一个例子,取子域映射。

然后,映射将如下所示:

@RequestMapping(value = "/path", headers="subdomain=www")

public String subsiteIndexPage(Model model,HttpServletRequest request) { ... }

如果我们想创建自定义的@RequestMapping属性,例如子域。创建这样的映射:

@RequestMapping(value = "/some/action", subdomain = "www")

public String handlerFunction(){ ... }

我们应该使用我们自己的实现覆盖@RequestMapping @interface定义并覆盖RequestMappingHandlerMapping受保护的方法

(如JIRA所述:“ 允许自定义请求映射条件SPR-7812 ”)。

这样对吗?有人可以提供提示,如何实现此功能吗?

想法1:

正如原始的jira线程所建议的,是创建自己的实现RequestCondition

在github上有一个使用此解决方案的项目:https : //github.com/rstoyanchev/spring-mvc-31-demo/

和相关的SO问题:在Spring MVC 3.1中添加自定义RequestCondition

也许像@Subdomain("www")类型和方法这样的映射,可能的解决方案?

回答:

我已经创建了基于引用的spring-mvc-31-demo的解决方案

到目前为止,此解决方案只能用于映射单个RequestCondition。我创建了两个要通知的问题,应该对此进行更改:

https : //github.com/rstoyanchev/spring-mvc-31-demo/issues/5

https://jira.springsource.org/browse/SPR-9350

该解决方案使用Spring 3.1.1.RELEASE平台的自定义@RequestCondition功能

用法

范例1:

@Controller

@SubdomainMapping(value = "subdomain", tld = ".mydomain.com")

class MyController1 {

// Code here will be executed only on address match:

// subdomain.mydomain.com

}

范例2:

@Controller

class MyController2 {

@RequestMapping("/index.html")

@SubdomainMapping("www")

public function index_www(Map<Object, String> map){

// on www.domain.com

// where ".domain.com" is defined in SubdomainMapping.java

}

@RequestMapping("/index.html")

@SubdomainMapping("custom")

public function index_custom(Map<Object, String> map){

// on custom.domain.com

// where ".domain.com" is defined in SubdomainMapping.java

}

}

我们需要三个文件

  • SubdomainMapping.java
  • SubdomainRequestCondition.java
  • SubdomainRequestMappingHandlerMapping.java

SubdomainMapping.java

import java.lang.annotation.Documented;

import java.lang.annotation.ElementType;

import java.lang.annotation.Retention;

import java.lang.annotation.RetentionPolicy;

import java.lang.annotation.Target;

@Target({ElementType.METHOD, ElementType.TYPE})

@Retention(RetentionPolicy.RUNTIME)

public @interface SubdomainMapping {

/**

* This param defines single or multiple subdomain

* Where the Method/Type is valid to be called

*/

String[] value() default {};

/**

* This param defines site domain and tld

* It's important to put the leading dot

* Not an array, so cannot be used for mapping multiple domains/tld

*/

String tld() default ".custom.tld";

}

SubdomainRequestCondition.java

import java.net.URL;

import java.util.Arrays;

import java.util.Collection;

import java.util.Collections;

import java.util.HashSet;

import java.util.LinkedHashSet;

import java.util.Set;

import javax.servlet.http.HttpServletRequest;

import org.springframework.web.servlet.mvc.condition.RequestCondition;

public class SubdomainRequestCondition implements

RequestCondition<SubdomainRequestCondition> {

private final Set<String> subdomains;

private final String tld;

public SubdomainRequestCondition(String tld, String... subdomains) {

this(tld, Arrays.asList(subdomains));

}

public SubdomainRequestCondition(String tld, Collection<String> subdomains) {

this.subdomains = Collections.unmodifiableSet(new HashSet<String>(

subdomains));

this.tld = tld;

}

@Override

public SubdomainRequestCondition combine(SubdomainRequestCondition other) {

Set<String> allRoles = new LinkedHashSet<String>(this.subdomains);

allRoles.addAll(other.subdomains);

return new SubdomainRequestCondition(tld, allRoles);

}

@Override

public SubdomainRequestCondition getMatchingCondition(

HttpServletRequest request) {

try {

URL uri = new URL(request.getRequestURL().toString());

String[] parts = uri.getHost().split(this.tld);

if (parts.length == 1) {

for (String s : this.subdomains) {

if (s.equalsIgnoreCase(parts[0])) {

return this;

}

}

}

} catch (Exception e) {

e.printStackTrace(System.err);

}

return null;

}

@Override

public int compareTo(SubdomainRequestCondition other,

HttpServletRequest request) {

return org.apache.commons.collections.CollectionUtils.removeAll(other.subdomains, this.subdomains).size();

}

}

SubdomainRequestMappingHandlerMapping.java

import java.lang.reflect.Method;

import org.springframework.core.annotation.AnnotationUtils;

import org.springframework.web.servlet.mvc.condition.RequestCondition;

import org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping;

public class CustomRequestMappingHandlerMapping extends

RequestMappingHandlerMapping {

@Override

protected RequestCondition<?> getCustomTypeCondition(Class<?> handlerType) {

SubdomainMapping typeAnnotation = AnnotationUtils.findAnnotation(

handlerType, SubdomainMapping.class);

return createCondition(typeAnnotation);

}

@Override

protected RequestCondition<?> getCustomMethodCondition(Method method) {

SubdomainMapping methodAnnotation = AnnotationUtils.findAnnotation(

method, SubdomainMapping.class);

return createCondition(methodAnnotation);

}

private RequestCondition<?> createCondition(SubdomainMapping accessMapping) {

return (accessMapping != null) ? new SubdomainRequestCondition(

accessMapping.tld(), accessMapping.value()) : null;

}

}

安装方式

重要说明:到目前为止,无法将此解决方案与XML元素

一起使用,请参见JIRA https://jira.springsource.org/browse/SPR-9344以获取解释。

  • 你必须注册自定义MappingHandler bean,指向此自定义实现SubdomainRequestMappingHandlerMapping类。
  • 你必须将其订单设置为低于默认订单,RequestMappingHandlerMapping

    替换已注册的RequestMappingHandlerMapping订单(可能在order = 0上)

    有关实现此解决方案的更多说明,请参见相关的github项目。

以上是 如何实现@RequestMapping自定义属性 的全部内容, 来源链接: utcz.com/qa/425279.html

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