SpringMVC----RESTFUL_CRUD_删除操作&处理静态资源
1.
list.jsp <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> <!-- SpringMVC处理静态资源 1.为什么会有这种问题？ 优雅的REST风格的资源URL不希望带.html或.do等后缀; 若将DispatcherServlet请求映射为/,则springMVC将捕获WEB容器的所有请求,包括静态资源(图片、css、js)的请求,springMVC会将 他们当成一个普通请求处理,因此找不到对应的处理器将导致错误 2.如何解决： 在springMVC的配置文件中配置：<mvc:default-servlet-handler/>的方式解决静态资源的问题 --> <script type="text/javascript" src="scripts/jquery-1.9.1.min.js"></script> <script type="text/javascript"> $(function() { $(".delete").click(function() { var href = $(this).attr("href"); $("form").attr("action", href).submit(); return false; }); }) </script> </head> <body> <form action="" method="POST"> <input type="hidden" name="_method" value="DELETE" /> </form> <c:if test="${empty requestScope.employees }"> 没有任何员工信息. </c:if> <c:if test="${!empty requestScope.employees }"> <table border="1" cellpadding="10" cellspacing="0"> <tr> <th>ID</th> <th>LastName</th> <th>Email</th> <th>Gender</th> <th>Department</th> <th>Edit</th> <th>Delete</th> </tr> <c:forEach items="${requestScope.employees }" var="emp"> <tr> <td>${emp.id }</td> <td>${emp.lastName }</td> <td>${emp.email }</td> <td>${emp.gender == 0 ? 'Female' : 'Male' }</td> <td>${emp.department.departmentName }</td> <td><a href="#">Edit</a></td> <!-- 默认超链接是一个GET请求，但是使用HiddenHttpMethodFilter后POST请求才能转换成DELETE请求（借助js实现） --> <td><a class="delete" href="emp/${emp.id}">Delete</a></td> </tr> </c:forEach> </table> </c:if> <br> <br> <a href="emp">Add New Employee</a> </body> </html> springmvc.xml <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context" xmlns:dubbo="http://code.alibabatech.com/schema/dubbo" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd"> <!-- 1.配置所以自动扫描的包 --> <context:component-scan base-package="com.yikuan.springmvc"></context:component-scan> <!-- 2.配置视图解析器 --> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/views/"></property> <property name="suffix" value=".jsp"></property> </bean> <!-- <mvc:default-servlet-handler/>将在springMVC上下文中定义一个DefaultServletHttpRequestHandler,他会对进入DispatcherServlet 的请求进行筛查,如果发现是没有经过映射的请求,就将该请求交由web应用服务器默认的servlet处理,如果不是静态资源的请求, 才由DispatcherServlet继续处理。一般web应用服务器默认的Servlet的名称都是default,若所使用的web服务器的默认servlet名称不是default, 则需要通过default-servlet-name属性显示指定<mvc:default-servlet-handler default-servlet-name="default"/> --> <mvc:default-servlet-handler /> <mvc:annotation-driven></mvc:annotation-driven> </beans> java代码 package com.yikuan.springmvc.crud.handlers; import java.util.Map; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import com.yikuan.springmvc.crud.dao.DepartmentDao; import com.yikuan.springmvc.crud.dao.EmployeeDao; import com.yikuan.springmvc.crud.entities.Employee; @Controller public class EmployeeHandler { @Autowired private EmployeeDao employeeDao; @Autowired private DepartmentDao departmentDao; @RequestMapping(value="/emp/{id}",method=RequestMethod.DELETE) public String delete(@PathVariable("id") Integer id){ employeeDao.delete(id); return "redirect:/emps"; } @RequestMapping(value="/emp",method=RequestMethod.POST) public String save(Employee employee){ employeeDao.save(employee); return "redirect:/emps"; } @RequestMapping(value="emp",method=RequestMethod.GET) public String input(Map<String,Object> map){ map.put("departments", departmentDao.getDepartments()); map.put("employee", new Employee()); return "input"; } @RequestMapping("/emps") public String list(Map<String, Object> map){ map.put("employees", employeeDao.getAll()); return "list"; } }
