URI：emps
请求方式：GET
显示效果
创建配置文件:springmvc.xml 增加context,mvc,beans名称空间。
<?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/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd 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-4.0.xsd"> <!-- 配置扫描的包：com.atguigu.springmvc.crud --> <context:component-scan base-package="com.jdy.springmvc"/> <!-- 配置视图解析器：默认采用转发 --> <bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/views/"/> <property name="suffix" value=".jsp"></property> </bean> </beans>
配置核心控制器：web.xml
<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> <servlet-mapping> <servlet-name>springDispatcherServlet</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping>
将 POST 请求转换为 PUT 或 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>
增加实体类
增加DAO类
@Repository public class EmployeeDao { private 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 initId = 1006; public void save(Employee employee){ if(employee.getId() == null){ employee.setId(initId++); } 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); }
}
@Repository public class DepartmentDao { private static Map<Integer, Department> departments = null; static{ departments = new LinkedHashMap<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); } }
增加页面链接
<a href="empList">To Employee List</a>
@Controller public class EmployeeHandler { @Autowired private EmployeeDao employeeDao ; @RequestMapping("/empList") public String empList(Map<String,Object> map){ map.put("empList", employeeDao.getAll()); //默认存放到request域中 return "list"; } }
SpringMVC中没遍历的标签，需要使用jstl标签进行集合遍历增加jstl标签库jar包
<%@ 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> </head> <body> <c:if test="${empty requestScope.empList }"> 对不起，没有找到任何员工！ </c:if> <c:if test="${!empty requestScope.empList }"> <table border="1" cellpadding="10" cellspacing="0"> <tr> <td>EmpId</td> <td>LastName</td> <td>Gender</td> <td>Email</td> <td>DepartmentName</td> <td>Edit</td> <td>Delete</td> </tr> <c:forEach items="${requestScope.empList }" var="emp"> <tr> <td>${emp.id }</td> <td>${emp.lastName }</td> <td>${emp.gender==0?"Female":"Male" }</td> <td>${emp.email }</td> <td>${emp.department.departmentName }</td> <td><a href="">Edit</a></td> <td><a href="">Delete</a></td> </tr> </c:forEach> </table> </c:if> </body> </html>
在list.jsp上增加连接
<a href="empInput">Add Employee</a>
增加处理器方法
@RequestMapping(value="/empInput",method=RequestMethod.GET) public String empInput(Map<String,Object> map){ map.put("deptList", departmentDao.getDepartments()); //解决错误：java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name ‘command‘ available as request attribute Employee employee = new Employee(); //map.put("command", employee); map.put("employee", employee); return "add"; }
显示添加页面
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" import="java.util.*"%> <%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %> <!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> </head> <body> <!-- 1.为什么使用SpringMVC的form标签 ① 快速开发 ② 表单回显 2.可以通过modelAttribute指定绑定的模型属性， 若没有指定该属性，则默认从request域中查找command的表单的bean 如果该属性也不存在，那么，则会发生错误。 --> <form:form action="empAdd" method="POST" modelAttribute="employee"> LastName : <form:input path="lastName"/><br><br> Email : <form:input path="email"/><br><br> <% Map<String,String> map = new HashMap<String,String>(); map.put("1", "Male"); map.put("0","Female"); request.setAttribute("genders", map); %> Gender : <br><form:radiobuttons path="gender" items="${genders }" delimiter="<br>"/><br><br> DeptName : <form:select path="department.id" items="${deptList }" itemLabel="departmentName" itemValue="id"></form:select><br><br> <input type="submit" value="Submit"><br><br> </form:form> </body> </html>
path：表单字段，对应 html 元素的 name 属性，支持级联属性
htmlEscape：是否对表单值的 HTML 特殊字符进行转换，默认值为 true
cssClass：表单组件对应的 CSS 样式类名
cssErrorClass：表单组件的数据存在错误时，采取的 CSS 样式
form:input、form:password、form:hidden、form:textarea：对应 HTML 表单的 text、password、hidden、textarea 标签
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：可以是一个 List、String[] 或 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
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
form:select：用于构造下拉框组件。使用方式同 form:radiobuttons 标签
form:option：下拉框选项组件标签。使用方式同 form:radiobuttons 标签
form:errors：显示表单组件或数据校验所对应的错误
<form:errors path= “*” /> ：显示表单所有的错误
<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
表单
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" import="java.util.*"%> <%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %> <!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> </head> <body> <!-- 1.为什么使用SpringMVC的form标签 ① 快速开发 ② 表单回显 2.可以通过modelAttribute指定绑定的模型属性， 若没有指定该属性，则默认从request域中查找command的表单的bean 如果该属性也不存在，那么，则会发生错误。 --> <form:form action="empAdd" method="POST" modelAttribute="employee"> LastName : <form:input path="lastName" /><br><br> Email : <form:input path="email" /><br><br> <% Map<String,String> map = new HashMap<String,String>(); map.put("1", "Male"); map.put("0","Female"); request.setAttribute("genders", map); %> Gender : <br><form:radiobuttons path="gender" items="${genders }" delimiter="<br>"/><br><br> DeptName : <form:select path="department.id" items="${deptList }" itemLabel="departmentName" itemValue="id"></form:select><br><br> <input type="submit" value="Submit"><br><br> </form:form> </body> </html>
控制器方法
@Controller public class EmployeeHandler { @RequestMapping(value="/empAdd",method=RequestMethod.POST) public String empAdd(Employee employee){ employeeDao.save(employee); return "redirect:/empList"; } }
页面链接
<td><a href="/empDelete/${emp.id }">Delete</a></td>
控制器方法
@RequestMapping(value="/empDelete/{id}" ,method=RequestMethod.DELETE)
public String empDelete(@PathVariable("id") Integer id){
employeeDao.delete(id);
return "redirect:/empList";
}
发起请求，无法执行，因为delete请求必须通过post请求转换为delete请求，借助：HiddenHttpMethodFilter过滤器
加入jQuery库文件
scripts/jquery-1.9.1.min.js
jQuery库文件不起作用
<!-- <mvc:default-servlet-handler/> 将在 SpringMVC 上下文中定义一个 DefaultServletHttpRequestHandler， 它会对进入 DispatcherServlet 的请求进行筛查，如果发现是没有经过映射的请求， 就将该请求交由 WEB 应用服务器默认的 Servlet 处理，如果不是静态资源的请求，才由 DispatcherServlet 继续处理 一般 WEB 应用服务器默认的 Servlet 的名称都是 default。 若所使用的 WEB 服务器的默认 Servlet 名称不是 default，则需要通过 default-servlet-name 属性显式指定 参考：CATALINA_HOME/config/web.xml <servlet> <servlet-name>default</servlet-name> <servlet-class>org.apache.catalina.servlets.DefaultServlet</servlet-class> <init-param> <param-name>debug</param-name> <param-value>0</param-value> </init-param> <init-param> <param-name>listings</param-name> <param-value>false</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> 该标签属性default-servlet-name默认值是"default",可以省略。 <mvc:default-servlet-handler/> --> <mvc:default-servlet-handler default-servlet-name="default"/>
<td><a class="delete" href="empDelete/${emp.id }">Delete</a></td>
<form action="" method="post"> <input type="hidden" name="_method" value="DELETE"/> </form> <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"); $("form").attr("action",href).submit(); return false ; }); }); </script>
页面链接
<td><a href="empEdit/${emp.id }">Edit</a></td>
控制器方法
//修改员工 - 表单回显 @RequestMapping(value="/empEdit/{id}",method=RequestMethod.GET) public String empEdit(@PathVariable("id") Integer id,Map<String,Object> map){ map.put("employee", employeeDao.get(id)); map.put("deptList",departmentDao.getDepartments()); return "edit"; }
修改页面
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" import="java.util.*"%> <%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %> <%@ 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> </head> <body> <!-- 1.为什么使用SpringMVC的form标签 ① 快速开发 ② 表单回显 2.可以通过modelAttribute指定绑定的模型属性， 若没有指定该属性，则默认从request域中查找command的表单的bean 如果该属性也不存在，那么，则会发生错误。 修改功能需要增加绝对路径，相对路径会报错，路径不对 --> <form:form action="${pageContext.request.contextPath }/empUpdate" method="POST" modelAttribute="employee"> <%-- LastName : <form:input path="lastName" /><br><br> --%> <form:hidden path="id"/> <input type="hidden" name="_method" value="PUT"> <%-- 这里不要使用form:hidden标签，否则会报错。 <form:hidden path="_method" value="PUT"/> Spring的隐含标签，没有value属性，同时,path指定的值，在模型对象中也没有这个属性(_method)，所以回显时会报错。 org.springframework.beans.NotReadablePropertyException: Invalid property ‘_method‘ of bean class [com.atguigu.springmvc.crud.entities.Employee]: Bean property ‘_method‘ is not readable or has an invalid getter method: Does the return type of the getter match the parameter type of the setter? --%> Email : <form:input path="email" /><br><br> <% Map<String,String> map = new HashMap<String,String>(); map.put("1", "Male"); map.put("0","Female"); request.setAttribute("genders", map); %> Gender : <br><form:radiobuttons path="gender" items="${genders }" delimiter="<br>"/><br><br> DeptName : <form:select path="department.id" items="${deptList }" itemLabel="departmentName" itemValue="id"></form:select><br><br> <input type="submit" value="Submit"><br><br> </form:form> </body> </html>
控制器方法
@RequestMapping(value="/empUpdate",method=RequestMethod.PUT) public String empUpdate(Employee employee){ employeeDao.save(employee); return "redirect:/empList"; }
原文：https://www.cnblogs.com/jdy1022/p/14544393.html