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  • Springmvc构造RESTful详细讲解

    /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 
    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(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>

    静态资源访问<mvc:resources>

    如果在DispatcherServlet中设置url-pattern为 /则必须对静态资源进行访问处理。

    spring mvc <mvc:resources mapping="" location="">实现对静态资源进行映射访问。

    如下是对js文件访问配置:

    <mvc:resources location="/js/" mapping="/js/**"/>

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  • 原文地址:https://www.cnblogs.com/dry0515/p/5170499.html
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