一、 在HTTP 协议里面,四个表示操作方式的动词:GET、POST、PUT、DELETE。
它们分别对应四种基本操作:
1、GET ====== 获 取资源
2、POST ======新建资源
3、PUT======= 更新资源
4、DELETE==== 删除资源
二、REST:即 Representational State Transfer。(资源)表现层状态转化。是目前最流行的一种互联网软件架构。它结构清晰、符合标准、易于理解、扩展方便, 所以正得到越来越多网站的采用。
我们可以通过rest风格占位符方式,利用@PathVariable注解将占位符的值赋给调用方法参数,实现结果:
/某路径/1 HTTP GET : 得到 id = 1 的 一条数据
/某路径/1 HTTP DELETE: 删除 id = 1的 一条数据
/某路径/1 HTTP PUT: 更新id = 1的 一条数据
/某路径 HTTP POST: 新增一条数据
实现方式(REST风格四种请求方式的调用):
我们通过@RequestMapping映射请求中的method参数实现四种请求方式的调用,以下为示例代码。
GET请求:
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@RequestMapping(value="/student",method=RequestMethod.GET)
public ModelAndView toAddPage(){
ModelAndView mView=new ModelAndView();
mView.addObject("employee",new Employee());
mView.setViewName("add-stu");
mView.addObject("departments", departmentDao.getDepartments());
return mView;
}
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POST请求:
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@RequestMapping(value="/student",method=RequestMethod.POST)
public String addStu(Employee employee){
employeeDao.save(employee);
return "redirect:/show" ;
}
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DELETE请求:
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@RequestMapping(value="/student/{id}",method=RequestMethod.DELETE)
public String deleteStu(@PathVariable(value="id") Integer id){
employeeDao.delete(id);
return "redirect:/show" ;
}
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PUT请求:
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@RequestMapping(value="/student",method=RequestMethod.PUT)
public String Update(@RequestParam(value="id")Integer id,Employee employee){
employeeDao.save(employee);
return "redirect:/show" ;
}
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三、将POST请求转化为put请求和delele请求
1.在web.xml文件中配置HiddenHttpMethodFilter过滤器:
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<!-- HiddenHttpMethodFilter过滤器可以将POST请求转化为put请求和delete请求! -->
< filter >
< filter-name >hiddenHttpMethodFilter</ filter-name >
< filter-class >org.springframework.web.filter.HiddenHttpMethodFilter</ filter-class >
</ filter >
< filter-mapping >
< filter-name >hiddenHttpMethodFilter</ filter-name >
< url-pattern >/*</ url-pattern >
</ filter-mapping >
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2.在表单域中需要携带一个name值为_method,value值为put或者delete的参数,如下所示:
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< form action = "" method = "post" >
< input type = "hidden" name = "_method" value = "delete" >
</ form >
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< form:form action = "${pageContext.request.contextPath}/student" method = "post" modelAttribute = "employee" >
< c:if test = "${empty employee.id }" >
姓名:< form:input path = "lastName" />< br >
</ c:if >
< c:if test = "${!empty employee.id }" >
姓名:< form:input path = "lastName" readonly = "true" />< br >
< form:hidden path = "id" />
< input type = "hidden" name = "_method" value = "put" >
</ c:if >
邮箱:< form:input path = "email" />< br >
<%
Map< String ,Object>map=new HashMap< String ,Object>();
map.put("1","Male");
map.put("0", "Female");
request.setAttribute("genders", map);
%>
性别:< form:radiobuttons path = "gender" items = "${genders}" />< br >
部门:< form:select path = "department.id" items = "${departments}" itemValue = "id" itemLabel = "departmentName" ></ form:select >< br >
< input type = "submit" value = "提交" >
</ form:form >
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最后在Controller层调用即可。根据@RequestMapping的value值以及携带的参数、请求方式查找匹配函数。
以上这篇SpringMVC的REST风格的四种请求方式总结就是小编分享给大家的全部内容了,希望能给大家一个参考,也希望大家多多支持服务器之家。
原文链接:http://www.cnblogs.com/alternative/archive/2017/08/28/7445742.html