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Spring Rest

 
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由于下一版本的rapid-framwork需要集成spring RESTful URL,所以研究了一下怎么搭建. 并碰到了一下问题。

 

springmvc 3.0 中增加 RESTful URL功能,构造出类似javaeye现在的URL。 rest介绍 , 这里还有struts2 rest构造的一篇文章: 使用 Struts 2 开发 RESTful 服务

简单例子如下,比如如下URL

Java代码 复制代码 收藏代码
  1. /blog/1  HTTP GET =>    得到id = 1的blog   
  2. /blog/1  HTTP DELETE => 删除 id = 1的blog   
  3. /blog/1  HTTP PUT  =>   更新id = 1的blog   
  4. /blog     HTTP POST =>   新增BLOG  
/blog/1  HTTP GET =>    得到id = 1的blog
/blog/1  HTTP DELETE => 删除 id = 1的blog
/blog/1  HTTP PUT  =>   更新id = 1的blog
/blog     HTTP POST =>   新增BLOG

 

 

以下详细解一下spring rest使用.

 

首先,我们带着如下个问题查看本文。
1. 如何在java构造没有扩展名的RESTful url,如 /forms/1,而不是 /forms/1.do

2. 由于我们要构造没有扩展名的url本来是处理静态资源的容器映射的,现在被我们的spring占用了,冲突怎么解决?
3. 浏览器的form标签不支持提交delete,put请求,如何曲线解决?

 

springmvc rest 实现


springmvc的resturl是通过@RequestMapping 及@PathVariable annotation提供的,通过如@RequestMapping(value="/blog/{id}",method=RequestMethod.DELETE)即可处理/blog/1 的delete请求.

Java代码 复制代码 收藏代码
  1. @RequestMapping(value="/blog/{id}",method=RequestMethod.DELETE)   
  2. public ModelAndView delete(@PathVariable Long id,HttpServletRequest request,HttpServletResponse response) {   
  3.     blogManager.removeById(id);   
  4.     return new ModelAndView(LIST_ACTION);   
  5. }  
@RequestMapping(value="/blog/{id}",method=RequestMethod.DELETE)
public ModelAndView delete(@PathVariable Long id,HttpServletRequest request,HttpServletResponse response) {
	blogManager.removeById(id);
	return new ModelAndView(LIST_ACTION);
}

 

@RequestMapping @PathVariable如果URL中带参数,则配合使用,如

Java代码 复制代码 收藏代码
  1. @RequestMapping(value="/blog/{blogId}/message/{msgId}",method=RequestMethod.DELETE)   
  2. public ModelAndView delete(@PathVariable("blogId") Long blogId,@PathVariable("msgId") Long msgId,HttpServletRequest request,HttpServletResponse response) {   
  3. }  
@RequestMapping(value="/blog/{blogId}/message/{msgId}",method=RequestMethod.DELETE)
public ModelAndView delete(@PathVariable("blogId") Long blogId,@PathVariable("msgId") Long msgId,HttpServletRequest request,HttpServletResponse response) {
}

 

 spring rest配置指南

1. springmvc web.xml配置

Xml代码 复制代码 收藏代码
  1. <!-- 该servlet为tomcat,jetty等容器提供,将静态资源映射从/改为/static/目录,如原来访问 http://localhost/foo.css ,现在http://localhost/static/foo.css -->  
  2. <servlet-mapping>  
  3.     <servlet-name>default</servlet-name>  
  4.     <url-pattern>/static/*</url-pattern>  
  5. </servlet-mapping>  
  6. <servlet>  
  7.     <servlet-name>springmvc</servlet-name>  
  8.     <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>  
  9.     <load-on-startup>1</load-on-startup>  
  10. </servlet>  
  11.   
  12. <!-- URL重写filter,用于将访问静态资源http://localhost/foo.css 转为http://localhost/static/foo.css -->  
  13. <filter>  
  14.     <filter-name>UrlRewriteFilter</filter-name>  
  15.     <filter-class>org.tuckey.web.filters.urlrewrite.UrlRewriteFilter</filter-class>  
  16.     <init-param>  
  17.             <param-name>confReloadCheckInterval</param-name>  
  18.             <param-value>60</param-value>  
  19.         </init-param>  
  20.     <init-param>  
  21.                 <param-name>logLevel</param-name>  
  22.                 <param-value>DEBUG</param-value>  
  23.         </init-param>        
  24. </filter>  
  25. <filter-mapping>  
  26.     <filter-name>UrlRewriteFilter</filter-name>  
  27.     <url-pattern>/*</url-pattern>  
  28. </filter-mapping>  
  29.   
  30. <!-- 覆盖default servlet的/, springmvc servlet将处理原来处理静态资源的映射 -->  
  31. <servlet-mapping>  
  32.     <servlet-name>springmvc</servlet-name>  
  33.     <url-pattern>/</url-pattern>  
  34. </servlet-mapping>  
  35.   
  36. <!-- 浏览器不支持put,delete等method,由该filter将/blog?_method=delete转换为标准的http delete方法 -->  
  37. <filter>  
  38.     <filter-name>HiddenHttpMethodFilter</filter-name>  
  39.     <filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>  
  40. </filter>  
  41.   
  42. <filter-mapping>  
  43.     <filter-name>HiddenHttpMethodFilter</filter-name>  
  44.     <servlet-name>springmvc</servlet-name>  
  45. </filter-mapping>  
	<!-- 该servlet为tomcat,jetty等容器提供,将静态资源映射从/改为/static/目录,如原来访问 http://localhost/foo.css ,现在http://localhost/static/foo.css -->
	<servlet-mapping>
		<servlet-name>default</servlet-name>
		<url-pattern>/static/*</url-pattern>
	</servlet-mapping>
	<servlet>
	    <servlet-name>springmvc</servlet-name>
	    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
	    <load-on-startup>1</load-on-startup>
	</servlet>
	
	<!-- URL重写filter,用于将访问静态资源http://localhost/foo.css 转为http://localhost/static/foo.css -->
	<filter>
		<filter-name>UrlRewriteFilter</filter-name>
		<filter-class>org.tuckey.web.filters.urlrewrite.UrlRewriteFilter</filter-class>
		<init-param>
		    	<param-name>confReloadCheckInterval</param-name>
		    	<param-value>60</param-value>
    		</init-param>
		<init-param>
            		<param-name>logLevel</param-name>
            		<param-value>DEBUG</param-value>
        	</init-param>    	
	</filter>
	<filter-mapping>
		<filter-name>UrlRewriteFilter</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>
	
	<!-- 覆盖default servlet的/, springmvc servlet将处理原来处理静态资源的映射 -->
	<servlet-mapping>
	    <servlet-name>springmvc</servlet-name>
	    <url-pattern>/</url-pattern>
	</servlet-mapping>
	
	<!-- 浏览器不支持put,delete等method,由该filter将/blog?_method=delete转换为标准的http delete方法 -->
	<filter>
		<filter-name>HiddenHttpMethodFilter</filter-name>
		<filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>
	</filter>
	
	<filter-mapping>
		<filter-name>HiddenHttpMethodFilter</filter-name>
		<servlet-name>springmvc</servlet-name>
	</filter-mapping>

 

 

2. webapp/WEB-INF/springmvc-servlet.xml配置,使用如下两个class激活@RequestMapping annotation

Java代码 复制代码 收藏代码
  1. <bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping"/>   
  2. <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"/>  
    <bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping"/>
    <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"/>

 

完整配置

Java代码 复制代码 收藏代码
  1. <beans default-autowire="byName"   >   
  2.   
  3.     <!-- 自动搜索@Controller标注的类 -->   
  4.     <context:component-scan base-package="com.**.controller"/>   
  5.        
  6.     <bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping"/>   
  7.   
  8.     <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"/>   
  9.   
  10.     <!-- Default ViewResolver -->   
  11.     <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">   
  12.         <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>   
  13.         <property name="prefix" value="/pages"/>   
  14.         <property name="suffix" value=".jsp"></property>   
  15.     </bean>   
  16.        
  17.     <bean id="messageSource" class="org.springframework.context.support.ResourceBundleMessageSource" p:basename="i18n/messages"/>   
  18.   
  19.     <!-- Mapping exception to the handler view -->   
  20.     <bean id="exceptionResolver" class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">   
  21.         <!-- to /commons/error.jsp -->   
  22.         <property name="defaultErrorView" value="/commons/error"/>   
  23.         <property name="exceptionMappings">   
  24.             <props>   
  25.             </props>   
  26.         </property>   
  27.     </bean>   
  28.            
  29. </beans>  
<beans default-autowire="byName"   >

	<!-- 自动搜索@Controller标注的类 -->
	<context:component-scan base-package="com.**.controller"/>
	
    <bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping"/>

    <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"/>

    <!-- Default ViewResolver -->
    <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
        <property name="prefix" value="/pages"/>
        <property name="suffix" value=".jsp"></property>
    </bean>
    
    <bean id="messageSource" class="org.springframework.context.support.ResourceBundleMessageSource" p:basename="i18n/messages"/>

    <!-- Mapping exception to the handler view -->
    <bean id="exceptionResolver" class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
    	<!-- to /commons/error.jsp -->
        <property name="defaultErrorView" value="/commons/error"/>
        <property name="exceptionMappings">
            <props>
            </props>
        </property>
    </bean>
        
</beans>

 

 

3. Controller编写

Java代码 复制代码 收藏代码
  1. /**  
  2.  * @RequestMapping("/userinfo") 具有层次关系,方法级的将在类一级@RequestMapping之一,  
  3.  * 如下面示例, 访问方法级别的@RequestMapping("/new"),则URL为 /userinfo/new  
  4.  */  
  5. @Controller  
  6. @RequestMapping("/userinfo")   
  7. public class UserInfoController extends BaseSpringController{   
  8.     //默认多列排序,example: username desc,createTime asc   
  9.     protected static final String DEFAULT_SORT_COLUMNS = null;    
  10.        
  11.     private UserInfoManager userInfoManager;   
  12.        
  13.     private final String LIST_ACTION = "redirect:/userinfo";   
  14.        
  15.     /**   
  16.      * 通过spring自动注入  
  17.      **/  
  18.     public void setUserInfoManager(UserInfoManager manager) {   
  19.         this.userInfoManager = manager;   
  20.     }   
  21.        
  22.     /** 列表 */  
  23.     @RequestMapping  
  24.     public ModelAndView index(HttpServletRequest request,HttpServletResponse response,UserInfo userInfo) {   
  25.         PageRequest<Map> pageRequest = newPageRequest(request,DEFAULT_SORT_COLUMNS);   
  26.         //pageRequest.getFilters(); //add custom filters   
  27.            
  28.         Page page = this.userInfoManager.findByPageRequest(pageRequest);   
  29.         savePage(page,pageRequest,request);   
  30.         return new ModelAndView("/userinfo/list","userInfo",userInfo);   
  31.     }   
  32.        
  33.     /** 进入新增 */  
  34.     @RequestMapping(value="/new")   
  35.     public ModelAndView _new(HttpServletRequest request,HttpServletResponse response,UserInfo userInfo) throws Exception {   
  36.         return new ModelAndView("/userinfo/new","userInfo",userInfo);   
  37.     }   
  38.        
  39.     /** 显示 */  
  40.     @RequestMapping(value="/{id}")   
  41.     public ModelAndView show(@PathVariable Long id,HttpServletRequest request,HttpServletResponse response) throws Exception {   
  42.         UserInfo userInfo = (UserInfo)userInfoManager.getById(id);   
  43.         return new ModelAndView("/userinfo/show","userInfo",userInfo);   
  44.     }   
  45.        
  46.     /** 编辑 */  
  47.     @RequestMapping(value="/{id}/edit")   
  48.     public ModelAndView edit(@PathVariable Long id,HttpServletRequest request,HttpServletResponse response) throws Exception {   
  49.         UserInfo userInfo = (UserInfo)userInfoManager.getById(id);   
  50.         return new ModelAndView("/userinfo/edit","userInfo",userInfo);   
  51.     }   
  52.        
  53.     /** 保存新增 */  
  54.     @RequestMapping(method=RequestMethod.POST)   
  55.     public ModelAndView create(HttpServletRequest request,HttpServletResponse response,UserInfo userInfo) throws Exception {   
  56.         userInfoManager.save(userInfo);   
  57.         return new ModelAndView(LIST_ACTION);   
  58.     }   
  59.        
  60.     /** 保存更新 */  
  61.     @RequestMapping(value="/{id}",method=RequestMethod.PUT)   
  62.     public ModelAndView update(@PathVariable Long id,HttpServletRequest request,HttpServletResponse response) throws Exception {   
  63.         UserInfo userInfo = (UserInfo)userInfoManager.getById(id);   
  64.         bind(request,userInfo);   
  65.         userInfoManager.update(userInfo);   
  66.         return new ModelAndView(LIST_ACTION);   
  67.     }   
  68.        
  69.     /** 删除 */  
  70.     @RequestMapping(value="/{id}",method=RequestMethod.DELETE)   
  71.     public ModelAndView delete(@PathVariable Long id,HttpServletRequest request,HttpServletResponse response) {   
  72.         userInfoManager.removeById(id);   
  73.         return new ModelAndView(LIST_ACTION);   
  74.     }   
  75.   
  76.     /** 批量删除 */  
  77.     @RequestMapping(method=RequestMethod.DELETE)   
  78.     public ModelAndView batchDelete(@RequestParam("items") Long[] items,HttpServletRequest request,HttpServletResponse response) {   
  79.            
  80.         for(int i = 0; i < items.length; i++) {   
  81.                
  82.             userInfoManager.removeById(items[i]);   
  83.         }   
  84.         return new ModelAndView(LIST_ACTION);   
  85.     }   
  86.        
  87. }  
/**
 * @RequestMapping("/userinfo") 具有层次关系,方法级的将在类一级@RequestMapping之一,
 * 如下面示例, 访问方法级别的@RequestMapping("/new"),则URL为 /userinfo/new
 */
@Controller
@RequestMapping("/userinfo")
public class UserInfoController extends BaseSpringController{
	//默认多列排序,example: username desc,createTime asc
	protected static final String DEFAULT_SORT_COLUMNS = null; 
	
	private UserInfoManager userInfoManager;
	
	private final String LIST_ACTION = "redirect:/userinfo";
	
	/** 
	 * 通过spring自动注入
	 **/
	public void setUserInfoManager(UserInfoManager manager) {
		this.userInfoManager = manager;
	}
	
	/** 列表 */
	@RequestMapping
	public ModelAndView index(HttpServletRequest request,HttpServletResponse response,UserInfo userInfo) {
		PageRequest<Map> pageRequest = newPageRequest(request,DEFAULT_SORT_COLUMNS);
		//pageRequest.getFilters(); //add custom filters
		
		Page page = this.userInfoManager.findByPageRequest(pageRequest);
		savePage(page,pageRequest,request);
		return new ModelAndView("/userinfo/list","userInfo",userInfo);
	}
	
	/** 进入新增 */
	@RequestMapping(value="/new")
	public ModelAndView _new(HttpServletRequest request,HttpServletResponse response,UserInfo userInfo) throws Exception {
		return new ModelAndView("/userinfo/new","userInfo",userInfo);
	}
	
	/** 显示 */
	@RequestMapping(value="/{id}")
	public ModelAndView show(@PathVariable Long id,HttpServletRequest request,HttpServletResponse response) throws Exception {
		UserInfo userInfo = (UserInfo)userInfoManager.getById(id);
		return new ModelAndView("/userinfo/show","userInfo",userInfo);
	}
	
	/** 编辑 */
	@RequestMapping(value="/{id}/edit")
	public ModelAndView edit(@PathVariable Long id,HttpServletRequest request,HttpServletResponse response) throws Exception {
		UserInfo userInfo = (UserInfo)userInfoManager.getById(id);
		return new ModelAndView("/userinfo/edit","userInfo",userInfo);
	}
	
	/** 保存新增 */
	@RequestMapping(method=RequestMethod.POST)
	public ModelAndView create(HttpServletRequest request,HttpServletResponse response,UserInfo userInfo) throws Exception {
		userInfoManager.save(userInfo);
		return new ModelAndView(LIST_ACTION);
	}
	
	/** 保存更新 */
	@RequestMapping(value="/{id}",method=RequestMethod.PUT)
	public ModelAndView update(@PathVariable Long id,HttpServletRequest request,HttpServletResponse response) throws Exception {
		UserInfo userInfo = (UserInfo)userInfoManager.getById(id);
		bind(request,userInfo);
		userInfoManager.update(userInfo);
		return new ModelAndView(LIST_ACTION);
	}
	
	/** 删除 */
	@RequestMapping(value="/{id}",method=RequestMethod.DELETE)
	public ModelAndView delete(@PathVariable Long id,HttpServletRequest request,HttpServletResponse response) {
		userInfoManager.removeById(id);
		return new ModelAndView(LIST_ACTION);
	}

	/** 批量删除 */
	@RequestMapping(method=RequestMethod.DELETE)
	public ModelAndView batchDelete(@RequestParam("items") Long[] items,HttpServletRequest request,HttpServletResponse response) {
		
		for(int i = 0; i < items.length; i++) {
			
			userInfoManager.removeById(items[i]);
		}
		return new ModelAndView(LIST_ACTION);
	}
	
}

 

 

上面是rapid-framework 新版本生成器生成的代码,以后也将应用此规则,rest url中增删改查等基本方法与Controller的方法映射规则

Java代码 复制代码 收藏代码
  1. /userinfo           => index()   
  2. /userinfo/new       => _new()   
  3. /userinfo/{id}      => show()   
  4. /userinfo/{id}/edit         => edit()   
  5. /userinfo   POST        => create()   
  6. /userinfo/{id}  PUT => update()   
  7. /userinfo/{id}  DELETE  => delete()   
  8. /userinfo   DELETE      => batchDelete()  
	/userinfo 			=> index()
	/userinfo/new		=> _new()
	/userinfo/{id}		=> show()
	/userinfo/{id}/edit 		=> edit()
	/userinfo 	POST		=> create()
	/userinfo/{id} 	PUT	=> update()
	/userinfo/{id} 	DELETE	=> delete()
	/userinfo 	DELETE		=> batchDelete()

 注(不使用 /userinfo/add  => add() 方法是由于add这个方法会被maxthon浏览器当做广告链接过滤掉,因为包含ad字符)

 

4. jsp 编写

Html代码 复制代码 收藏代码
  1. <form:form action="${ctx}/userinfo/${userInfo.userId}" method="put">  
  2. </form:form>  
<form:form action="${ctx}/userinfo/${userInfo.userId}" method="put">
</form:form>

 生成的html内容如下, 生成一个hidden的_method=put,并于web.xml中的HiddenHttpMethodFilter配合使用,在服务端将post请求改为put请求

Java代码 复制代码 收藏代码
  1. <form id="userInfo" action="/springmvc_rest_demo/userinfo/2" method="post">   
  2.     <input type="hidden" name="_method" value="put"/>   
  3. </form>  
<form id="userInfo" action="/springmvc_rest_demo/userinfo/2" method="post">
	<input type="hidden" name="_method" value="put"/>
</form>

 

另外一种方法是你可以使用ajax发送put,delete请求.

 

5. 静态资源的URL重写

   如上我们描述,现因为将default servlet映射至/static/的子目录,现我们访问静态资源将会带一个/static/前缀.

   如 /foo.gif, 现在访问该文件将是 /static/foo.gif.
   那如何避免这个前缀呢,那就是应用URL rewrite,现我们使用 http://tuckey.org/urlrewrite/, 重写规则如下

 

Xml代码 复制代码 收藏代码
  1. <urlrewrite>  
  2.     <!-- 访问jsp及jspx将不rewrite url,其它.js,.css,.gif等将重写,如 /foo.gif => /static/foo.gif -->  
  3.     <rule>  
  4.         <condition operator="notequal" next="and" type="request-uri">.*.jsp</condition>  
  5.         <condition operator="notequal" next="and" type="request-uri">.*.jspx</condition>  
  6.         <from>^(/.*\..*)$</from>  
  7.         <to>/static$1</to>  
  8.     </rule>  
  9. </urlrewrite>  
<urlrewrite>
    <!-- 访问jsp及jspx将不rewrite url,其它.js,.css,.gif等将重写,如 /foo.gif => /static/foo.gif -->
    <rule>
    	<condition operator="notequal" next="and" type="request-uri">.*.jsp</condition>
    	<condition operator="notequal" next="and" type="request-uri">.*.jspx</condition>
        <from>^(/.*\..*)$</from>
        <to>/static$1</to>
    </rule>
</urlrewrite>

   另笔者专门写了一个 RestUrlRewriteFilter来做同样的事件,以后会随着rapid-framework一起发布. 比这个更加轻量级.

 

并且该代码已经贡献给spring,不知会不会在下一版本发布

 

 

在线DEMO地址http://demo.rapid-framework.org.cn:8080/springmvc_rest_demo/userinfo

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