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  • Springmvc构造RESTful详细讲解

    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>
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  • 原文地址:https://www.cnblogs.com/heartstage/p/3409687.html
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