spring 3.0 应用springmvc 构造RESTful URL 详细讲解

spring 3.0 应用springmvc 构造RESTful URL 详细讲解
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
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，我们带着如下三个问题查看本文。 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
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
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
1. 
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>
12. 
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>
30. 
31. <servlet-mapping>
32. <servlet-name>springmvc</servlet-name>
33. <url-pattern>/</url-pattern>
34. </servlet-mapping>
36. 
37. <filter>
38. <filter-name>HiddenHttpMethodFilter</filter-name>
39. <filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>
40. </filter>
42. <filter-mapping>
43. <filter-name>HiddenHttpMethodFilter</filter-name>
44. <servlet-name>springmvc</servlet-name>
45. </filter-mapping>
```
	
	<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>
	
	
	<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>
	
	
	<servlet-mapping>
	    <servlet-name>springmvc</servlet-name>
	    <url-pattern>/</url-pattern>
	</servlet-mapping>
	
	
	<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
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
1. <beans default-autowire="byName" >
3. 
4. <context:component-scan base-package="com.**.controller"/>
6. <bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping"/>
8. <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"/>
10. 
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>
17. <bean id="messageSource" class="org.springframework.context.support.ResourceBundleMessageSource" p:basename="i18n/messages"/>
19. 
20. <bean id="exceptionResolver" class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
21. 
22. <property name="defaultErrorView" value="/commons/error"/>
23. <property name="exceptionMappings">
24. <props>
25. </props>
26. </property>
27. </bean>
29. </beans>
```
<beans default-autowire="byName"   >

	
	<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"/>

    
    <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"/>

    
    <bean id="exceptionResolver" class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
    	
        <property name="defaultErrorView" value="/commons/error"/>
        <property name="exceptionMappings">
            <props>
            </props>
        </property>
    </bean>
        
</beans>
```
3. Controller编写
Java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;
11. private UserInfoManager userInfoManager;
13. private final String LIST_ACTION = "redirect:/userinfo";
15. /**
16. * 通过spring自动注入
17. **/
18. public void setUserInfoManager(UserInfoManager manager) {
19. this.userInfoManager = manager;
20. }
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
28. Page page = this.userInfoManager.findByPageRequest(pageRequest);
29. savePage(page,pageRequest,request);
30. return new ModelAndView("/userinfo/list","userInfo",userInfo);
31. }
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. }
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. }
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. }
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. }
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. }
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. }
76. /** 批量删除 */
77. @RequestMapping(method=RequestMethod.DELETE)
78. public ModelAndView batchDelete(@RequestParam("items") Long[] items,HttpServletRequest request,HttpServletResponse response) {
80. for(int i = 0; i < items.length; i++) {
82. userInfoManager.removeById(items[i]);
83. }
84. return new ModelAndView(LIST_ACTION);
85. }
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
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
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
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
1. <urlrewrite>
2. 
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>
    
    <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
相关阅读:
uva 11728 Alternate Task
uvalive 5009 Error Curves
uva 10341 Solve It
uva 10870 Recurrences
uva 11021 Tribbles
17年9月6日
 React实践相关
 React：Refs and DOM
React:propTypes
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原文地址：https://www.cnblogs.com/heartstage/p/3409660.html

spring 3.0 应用springmvc 构造RESTful URL 详细讲解

springmvc rest 实现

spring rest配置指南