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界面：

项目结构：

代码

web.xml

<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1"> <display-name>springmvc-2</display-name> <!-- 配置filter 把POST请求转为 DELETE 、PUT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> <!-- 配置SpringMVC 的DispatcherServlet --> <servlet> <servlet-name>springDispatcherServlet</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:springmvc.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <!-- Map all requests to the DispatcherServlet for handling --> <servlet-mapping> <servlet-name>springDispatcherServlet</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> </web-app>

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:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd"> <!-- 配置自动扫描类 --> <context:component-scan base-package="com.jxust.springmvc"></context:component-scan> <!--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> <!-- 静态资源交给默认的Servlet--> <mvc:default-servlet-handler/> <mvc:annotation-driven></mvc:annotation-driven> </beans>

Department.java

package com.jxust.springmvc.crud.entities; /** * 部门实体类 * @author Peng * @Date2016年12月3日下午8:33:47 */ public class Department { private Integer id; private String departmentName; public Department() { super(); } public Department(Integer id, String departmentName) { super(); this.id = id; this.departmentName = departmentName; } public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getDepartmentName() { return departmentName; } public void setDepartmentName(String departmentName) { this.departmentName = departmentName; } @Override public String toString() { return "Department [id=" + id + ", departmentName=" + departmentName + "]"; } }

Employee.java

package com.jxust.springmvc.crud.entities; /** * 员工实体类 * @author Peng * @Date2016年12月3日下午8:33:18 */ public class Employee { private Integer id; private String lastName; private String email; //1 male,0 female private Integer gender; private Department department; public Employee() { super(); } public Employee(Integer id, String lastName, String email, Integer gender, Department department) { super(); this.id = id; this.lastName = lastName; this.email = email; this.gender = gender; this.department = department; } // 省略 setter and getter public void setDepartment(Department department) { this.department = department; } }

DepartmentDao.java

package com.jxust.springmvc.crud.dao; import java.util.Collection; import java.util.HashMap; import java.util.Map; import org.springframework.stereotype.Repository; import com.jxust.springmvc.crud.entities.Department; @Repository public class DepartmentDao { private static Map<Integer,Department> departments = null; static{ departments = new HashMap<Integer,Department>(); departments.put(101, new Department(101,"D-AA")); departments.put(102, new Department(102,"D-BB")); departments.put(103, new Department(103,"D-CC")); departments.put(104, new Department(104,"D-DD")); departments.put(105, new Department(105,"D-EE")); } public Collection<Department> getDepartments(){ return departments.values(); } public Department getDepartment(Integer id){ return departments.get(id); } }

EmployeeDao.java

package com.jxust.springmvc.crud.dao; import java.util.Collection; import java.util.HashMap; import java.util.Map; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Repository; import com.jxust.springmvc.crud.entities.Department; import com.jxust.springmvc.crud.entities.Employee; @Repository public class EmployeeDao { public static Map<Integer,Employee> employees = null; @Autowired private DepartmentDao departmentDao; static{ employees = new HashMap<Integer,Employee>(); employees.put(1001, new Employee(1001,"E-AA","aa@163.com",1,new Department(101,"D-AA"))); employees.put(1002, new Employee(1002,"E-BB","bb@163.com",1,new Department(102,"D-BB"))); employees.put(1003, new Employee(1003,"E-CC","cc@163.com",0,new Department(103,"D-CC"))); employees.put(1004, new Employee(1004,"E-DD","dd@163.com",0,new Department(104,"D-DD"))); employees.put(1005, new Employee(1005,"E-EE","ee@163.com",1,new Department(105,"D-EE"))); } private static Integer inintid = 1006; public void save(Employee employee){ if(employee.getId()==null){ employee.setId(inintid++); } employee.setDepartment(departmentDao.getDepartment(employee.getDepartment().getId())); employees.put(employee.getId(), employee); } public Collection<Employee> getAll(){ return employees.values(); } public Employee get(Integer id){ return employees.get(id); } public void delete(Integer id){ employees.remove(id); } }

Controller 控制器

EmployeeHandler.java

package com.jxust.springmvc.curd.handlers; import java.util.Map; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.ModelAttribute; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.RequestParam; import com.jxust.springmvc.crud.dao.DepartmentDao; import com.jxust.springmvc.crud.dao.EmployeeDao; import com.jxust.springmvc.crud.entities.Employee; @Controller public class EmployeeHandler { @Autowired private EmployeeDao employeeDao; @Autowired private DepartmentDao departmentDao; /** * 显示所有Employee信息 对应list.jsp * * @param map * @return */ @RequestMapping("/emps") public String list(Map<String, Object> map) { map.put("employees", employeeDao.getAll()); System.out.println("执行list方法，查询所有员工信息....."); return "list"; } /** * 跳转到添加页面input.jsp * get 请求 * @param map * @return */ @RequestMapping(value = "/emp", method = RequestMethod.GET) public String input(Map<String, Object> map) { map.put("departments", departmentDao.getDepartments()); map.put("employee", new Employee()); System.out.println("执行input方法，跳转到添加页面input.jsp....."); return "input"; } /** * 保存Employee操作 * post 请求 * @param employee * @return */ @RequestMapping(value = "/emp", method = RequestMethod.POST) public String save(Employee employee) { System.out.println("执行save方法，保存添加的数据....."); employeeDao.save(employee); return "redirect:/emps"; } /** * 删除操作 * delete 请求 * @param id * @return */ @RequestMapping(value = "/emp/{id}", method = RequestMethod.DELETE) public String delete(@PathVariable("id") Integer id) { System.out.println("执行delete方法，删除一条数据....."); employeeDao.delete(id); return "redirect:/emps"; } /** * 转到修改页面input.jsp,并回显数据 * get 请求 * @param id * @param map * @return */ @RequestMapping(value = "/emp/{id}", method = RequestMethod.GET) public String input(@PathVariable("id") Integer id, Map<String, Object> map) { map.put("employee", employeeDao.get(id)); map.put("departments", departmentDao.getDepartments()); return "input"; } /** * 执行修改操作时，lastName 不修改，为了防止为null，需要获取从数据库中获取包含该属性值的对象 * @param id * @param map */ @ModelAttribute public void getEmployee(@RequestParam(value = "id", required = false) Integer id, Map<String, Object> map) { System.out.println("ModelAttribute方法执行...."); if (id != null) { map.put("employee", employeeDao.get(id)); } } /** * 修改操作 * put 请求 * @param employee * @return */ @RequestMapping(value = "/emp", method = RequestMethod.PUT) public String update(Employee employee) { System.out.println("执行update方法..."); employeeDao.save(employee); return "redirect:/emps"; } }

index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!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> <script type="text/javascript" src="https://code.jquery.com/jquery-3.0.0.min.js"></script> <script type="text/javascript"> $(function() { //alert("hello"); }); </script> </head> <body> <a href="emps"> List ALL</a> </body> </html>

list.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%> <!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> <script type="text/javascript" src="https://code.jquery.com/jquery-3.0.0.min.js"></script> <script type="text/javascript"> $(function() { //alert("hello"); $(".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="${!empty requestScope.employees }"> <table border="1" cellpadding="10" cellspacing="0"> <tr> <td>ID</td> <td>LastName</td> <td>Email</td> <td>Gender</td> <td>Department</td> <td>Edit</td> <td>Delete</td> </tr> <c:forEach items="${requestScope.employees }" var="emp"> <tr> <th>${emp.id }</th> <th>${emp.lastName }</th> <th>${emp.email }</th> <th>${emp.gender==0?'Female':'Male' }</th> <th>${emp.department.departmentName }</th> <th><a href="emp/${emp.id}">Edit</a></th> <th><a class="delete" href="emp/${emp.id}">Delete</a></th> </tr> </c:forEach> </table> </c:if> <br><br> <a href="emp">Add New Employee</a> </body> </html>

input.jsp

<%@ page language="java" import="java.util.*" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ taglib uri="http://www.springframework.org/tags/form" prefix="form"%> <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%> <!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>修改和添加都使用这个页面</title> </head> <body> <!-- 1.为什么使用 form 标签 可以快速的开发出表单页面，而且可以更方便的进行表单值的回显 2.注意 可以通过 modelAttribute 属性指定绑定的模型属性， 若没有指定该属性，则默认从request 域对象中读取 command 的表单 bean,如果找不到command会报错 form:。。 是主要用来回显的，path里的对应属性都要有，不管其值为空等等 action="${pageContext.request.contextPath}/emp" 不使用这个input方法报错 /emp --> <form:form action="${pageContext.request.contextPath}/emp" method="post" modelAttribute="employee"> <!--path 属性对应Html 表单标签的 name 属性值 --> <!-- 修改时，不显示lastName--> <c:if test="${employee.id == null }"> LastName:<form:input path="lastName"/> <br> </c:if> <c:if test="${employee.id!=null }"> <form:hidden path="id"/> <input type="hidden" name="_method" value="put"/> </c:if> Email:<form:input path="email"/> <br> <% Map<Integer,String> genders = new HashMap<Integer,String>(); genders.put(1, "Male"); genders.put(0, "Female"); request.setAttribute("genders", genders); %> Gender:<br> <form:radiobuttons path="gender" items="${genders }" delimiter="<br>"/> <br> Department: <!--path="department.id"用到了级联属性 --> <form:select path="department.id" items="${departments }" itemLabel="departmentName" itemValue="id"><br> </form:select> <input type="submit" value="Submit"> </form:form> </body> </html>

笔记.txt

1. form:input,form:password,form:hidden,form:textarea 对应Html表单中的text,password,hidden,textarea 标签 2. form:radiobutton 单选框组件标签，当表单bean 对应的属性值和 value 值相等时， 单选框被选中 form:radiobuttons 单选框组标签，用于构造多个单选框 --items 可以是 List、String[] 、Map --itemValue 指定radio的value值，可以是集合中bean的一个属性值 --itemLabel 指定radio的label 值 --delimiter 多个单选框可以通过 delimiter 指定分隔符 3. form:checkbox 复选框组件，用于构造单个复选框 form:checkboxs 用于构造多个复选框，使用方式同 form:radiobuttons标签 4. form:select 用于构造下拉框组件，使用方式同form:radiobuttons标签 5. form:option 下拉框选项组件标签。使用方式同form:radiobuttons标签 6. form:errors 显示表单组件或者数据校验所对应的错误 --<form:errors path="*" /> 显示表单所有错误 --<form:errors path="user* /> 显示所有以user为前缀的属性对应的错误 --<form:errors path="username"/> 显示特定表单对象属性的错误 -------------------------- <mvc:annotation-driven></mvc:annotation-driven> 会自动注册 RequestMappingHandlerMapping、RequestMappingHandlerAdapter 和ExceptionHandlerExceptionResolver三个bean 还提供了以下的支持 -支持使用ConversionService 示例对表单参数进行类型转换 -支持使用@NumberFormatannotation、@DateTimeFormat 注解完成数据类型的格式化 -支持使用 @Valid 注解对 JavaBean 实例进行JSR 303验证 -支持使用@RequestBody 和 @ResponseBody 注解