Rest介绍
/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,我们带着如下两个问题查看本文。
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.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.
1@RequestMapping(value="/blog/{id}",method=RequestMethod.DELETE)
2public ModelAndView delete(@PathVariable Long id,HttpServletRequest request,HttpServletResponse response) {
3 blogManager.removeById(id);
4 return new ModelAndView(LIST_ACTION);
5}
@RequestMapping @PathVariable如果URL中带参数,则配合使用,如
1@RequestMapping(value="/blog/{blogId}/message/{msgId}",method=RequestMethod.DELETE) 2public ModelAndView delete(@PathVariable("blogId") Long blogId,@PathVariable("msgId") Long msgId,HttpServletRequest request,HttpServletResponse response) { 3}
1.springmvc web.xml配置
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>
2.webapp/WEB-INF/springmvc-servlet.xml配置,使用如下两个class激活@RequestMapping annotation
1<bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping"/>
2<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"/>
3
3.Controller编写
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") 7public 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 2728 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(HttpServletRequest request,HttpServletResponse response) { 79 String[] items = request.getParameterValues("items"); 80 for(int i = 0; i < items.length; i++) { 81 java.lang.Long id = new java.lang.Long(items[i]); 82 userInfoManager.removeById(id); 83 }84 return new ModelAndView(LIST_ACTION); 85 }86 87}88
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()
9
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
1<form:form action="${ctx}/userinfo${userInfo.userId}" method="put">
2</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
1<form id="userInfo" action="/springmvc_rest_demo/userinfo/2" method="post">
2 <input type="hidden" name="_method" value="put"/>
3</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
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>