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)
2![](http://www.blogjava.net/Images/OutliningIndicators/ExpandedBlockStart.gif)
public 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) 2![](http://www.blogjava.net/Images/OutliningIndicators/ExpandedBlockStart.gif)
public 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
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<bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping"/>
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<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"/>
3![](http://www.blogjava.net/Images/OutliningIndicators/None.gif)
3.Controller编写
1![](http://www.blogjava.net/Images/OutliningIndicators/ExpandedBlockStart.gif)
/** *//** 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![](http://www.blogjava.net/Images/OutliningIndicators/ExpandedBlockStart.gif)
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
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private UserInfoManager userInfoManager; 12
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private final String LIST_ACTION = "redirect:/userinfo"; 14
15![](http://www.blogjava.net/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
/** *//**16
* 通过spring自动注入 17
**/18![](http://www.blogjava.net/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
public void setUserInfoManager(UserInfoManager manager)
{ 19
this.userInfoManager = manager; 20
}21
22![](http://www.blogjava.net/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
/** *//** 列表 */23
@RequestMapping 24![](http://www.blogjava.net/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
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![](http://www.blogjava.net/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
/** *//** 进入新增 */34
@RequestMapping(value="/new") 35![](http://www.blogjava.net/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
public ModelAndView _new(HttpServletRequest request,HttpServletResponse response,UserInfo userInfo) throws Exception
{ 36
return new ModelAndView("/userinfo/new","userInfo",userInfo); 37
}38
39![](http://www.blogjava.net/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
/** *//** 显示 */40
@RequestMapping(value="/{id}") 41![](http://www.blogjava.net/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
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![](http://www.blogjava.net/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
/** *//** 编辑 */47
@RequestMapping(value="/{id}/edit") 48![](http://www.blogjava.net/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
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![](http://www.blogjava.net/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
/** *//** 保存新增 */54
@RequestMapping(method=RequestMethod.POST) 55![](http://www.blogjava.net/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
public ModelAndView create(HttpServletRequest request,HttpServletResponse response,UserInfo userInfo) throws Exception
{ 56
userInfoManager.save(userInfo); 57
return new ModelAndView(LIST_ACTION); 58
}59
60![](http://www.blogjava.net/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
/** *//** 保存更新 */61
@RequestMapping(value="/{id}",method=RequestMethod.PUT) 62![](http://www.blogjava.net/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
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![](http://www.blogjava.net/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
/** *//** 删除 */70
@RequestMapping(value="/{id}",method=RequestMethod.DELETE) 71![](http://www.blogjava.net/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
public ModelAndView delete(@PathVariable Long id,HttpServletRequest request,HttpServletResponse response)
{ 72
userInfoManager.removeById(id); 73
return new ModelAndView(LIST_ACTION); 74
}75
76![](http://www.blogjava.net/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
/** *//** 批量删除 */77
@RequestMapping(method=RequestMethod.DELETE) 78![](http://www.blogjava.net/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
public ModelAndView batchDelete(HttpServletRequest request,HttpServletResponse response)
{ 79
String[] items = request.getParameterValues("items"); 80![](http://www.blogjava.net/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
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![](http://www.blogjava.net/Images/OutliningIndicators/None.gif)
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![](http://www.blogjava.net/Images/OutliningIndicators/None.gif)
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
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<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 -->
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<rule>
4
<condition operator="notequal" next="and" type="request-uri">.*.jsp</condition>
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<condition operator="notequal" next="and" type="request-uri">.*.jspx</condition>
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<from>^(/.*\..*)$</from>
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<to>/static$1</to>
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</rule>
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</urlrewrite>