SpringMVC學習之REST
阿新 • • 發佈：2017-12-25
rest風格 單選 解析 mls ash package mail input stp
web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"> <display-name></display-name> <!-- 配置org.springframework.web.filter.HiddenHttpMethodFilter:可以把POST請求轉為DELETE或POST請求--> <filter> <filter-name>HiddenHttpMethodFilter</filter-name> <filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class> </filter> <filter-mapping> <filter-name>HiddenHttpMethodFilter</filter-name> <!-- 過濾所有請求 --> <url-pattern>/*</url-pattern> </filter-mapping> <!-- 配置DispatcherServlet --> <servlet> <servlet-name>springDispatcherServlet</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <!-- 配置 DispatcherServlet的一個初始化參數:配置SpringMvc 配置文件的位置和名稱--> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:springmvc.xml</param-value> </init-param> <init-param> <param-name>encoding</param-name> <param-value>UTF-8</param-value> </init-param> <!-- 也可以不通過contextConfigLocation 來配置SpringMvc的配置文件，而使用默認的 默認的配置文件為：/WEB-INF/<servlet-name>-servlet.xml /WEB-INF/springDispatcherServlet-servlet.xml --> <!-- 設置啟動 --> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <!-- 請求處理 --> <servlet-name>springDispatcherServlet</servlet-name> <!-- /:應答所有請求 --> <url-pattern>/</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> </web-app>
springmvc.xml
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-mvc-4.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd"> <!-- 配置自定義掃描包 --> <context:component-scan base-package="como.springmvc.handlers"></context:component-scan> <!-- 配置視圖解析器：如何把handler方法返回值解析為實際的物理視圖 --> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <!-- spring中加入jstl標簽庫 --> <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"></property> <!-- 前綴 --> <property name="prefix" value="/WEB-INF/views/"></property> <!-- 後綴 --> <property name="suffix" value=".jsp"></property> </bean> <!-- 配置視圖BeanNameViewResolver解析器 ,使用視圖名字解析視圖--> <!-- 通過order屬性定義視圖解析器的優先級，值越少優先級越高 --> <bean class="org.springframework.web.servlet.view.BeanNameViewResolver"> <property name="order" value="100"></property> </bean> <!-- 配置國際化資源文件 --> <bean id="messageSource" class="org.springframework.context.support.ResourceBundleMessageSource"> <property name="basename" value="i18n"></property> </bean> <!-- 配置直接轉發的頁面 --> <!-- <mvc:view-controller path="/success" view-name="success" /> --> <!-- 在實際開發中通常都需要配置mvc：annotation-driven標簽 因為加上mvc:view-controller後以前的@RequestMapping不起作用 --> <!-- <mvc:annotation-driven></mvc:annotation-driven> --> <mvc:default-servlet-handler/> <mvc:annotation-driven /> </beans>
Employee.java
package como.springmvc.handlers.entity; public class Employee { private Integer id; private String lastName; private String email; private int gender; private Department department; public Integer getId() { return id; } public void setId(int id) { this.id = id; } public String getLastName() { return lastName; } public void setLastName(String lastName) { this.lastName = lastName; } public String getEmail() { return email; } public void setEmail(String email) { this.email = email; } public int getGender() { return gender; } public void setGender(int gender) { this.gender = gender; } public Department getDepartment() { return department; } public void setDepartment(Department department) { this.department = department; } public Employee(Integer id, String lastName, String email, int gender, Department department) { super(); this.id = id; this.lastName = lastName; this.email = email; this.gender = gender; this.department = department; } public Employee() { super(); } }
Department.java
package como.springmvc.handlers.entity; public class Department { private Integer id; private String departementName; public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getDepartementName() { return departementName; } public void setDepartementName(String departementName) { this.departementName = departementName; } public Department(int id, String departementName) { super(); this.id = id; this.departementName = departementName; } public Department() { super(); } }
DepartementDao.java
package como.springmvc.handlers.dao; import java.util.Collection; import java.util.HashMap; import java.util.Map; import org.springframework.stereotype.Repository; import como.springmvc.handlers.entity.Department; @Repository//@Repository用於標註數據訪問組件，即DAO組件 public class DepartmentDao { private static Map<Integer,Department> departments = null; static{//靜態數據，服務器重啟恢復原始狀態 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")); } //獲取全部的departments public Collection<Department> getDepartments(){ return departments.values(); } //獲取指定id的department public Department getDepartment(Integer id){ return departments.get(id); } }
EmployeeDao.java
package como.springmvc.handlers.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 como.springmvc.handlers.entity.Department; import como.springmvc.handlers.entity.Employee; @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@123",1, new Department(101, "D-AA"))); employees.put(1002, new Employee(1002,"E-BB","bb@123",0, new Department(102, "D-BB"))); employees.put(1003, new Employee(1003,"E-CC","cc@123",1, new Department(103, "D-CC"))); employees.put(1004, new Employee(1004,"E-DD","dd@123",1, new Department(104, "D-DD"))); employees.put(1005, new Employee(1005,"E-EE","ee@123",0, 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); } }
EmployeeHandler.java
package como.springmvc.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 como.springmvc.handlers.dao.DepartmentDao; import como.springmvc.handlers.dao.EmployeeDao; import como.springmvc.handlers.entity.Employee; @Controller public class EmployeeHandler { @Autowired private EmployeeDao employeeDao; @Autowired private DepartmentDao departmentDao; @ModelAttribute public void getEmployee(@RequestParam(value="id",required=false) Integer id,Map<String,Object> map){ if(id !=null){ map.put("employee", employeeDao.get(id)); } } @RequestMapping(value="/emp",method=RequestMethod.PUT) public String update(Employee employee){ employeeDao.save(employee); return "redirect:/emps"; } @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"; } @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"; } @RequestMapping(value="emp/{id}",method=RequestMethod.DELETE) public String delete(@PathVariable("id") Integer id){ employeeDao.delete(id); return "redirect:/emps"; } }
index.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>My JSP ‘inde.jsp‘ starting page</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <!-- <link rel="stylesheet" type="text/css" href="styles.css"> --> </head> <body> <a href="emps">list all Employees</a> </body> </html>
list.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>My JSP ‘list.jsp‘ starting page</title> <!--SpringMVC處理靜態資源 REST風格的資源URL不希望帶.html或.do等後綴 若將DispatcherServlet請求映射配置為/,則SpringMVC將捕獲WEB容器的所有請求， 包括靜態資源的請求，SpringMVC會將他們當作一個普通請求處理，因找不到對應處理器將導致錯誤。 解決：配置<mvc:default-servlet-handler/> --> <script type="text/javascript" src="js/jquery-3.2.1.js"></script> </head> <body> <form action="" method="post"> <input type="hidden" name="_method" value="DELETE" /> </form> <c:if test="${empty requestScope.employees }"> no information </c:if> <c:if test="${!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.departementName}</td> <td><a href="emp/${emp.id}">Edit</a></td> <td><a class="delete" href="emp/${emp.id }">Delete</a></td> </tr> </c:forEach> </table> </c:if> <a href="emp">Add</a> </body> <script type="text/javascript"> $(function(){ $(".delete").click(function(){ var href=$(this).attr("href"); $("form").attr("action",href).submit(); return false; }); }); </script> </html>
input.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %> <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>My JSP ‘input.jsp‘ starting page</title> </head> <body> <!-- 使用form標簽：更快速的開發出表單頁面，而且可以更方便的進行表單值的回顯 modelAttribute屬性指定綁定的模型屬性，若沒有指定該屬性，則默認從request域 對象中讀取command的表單bean，如果該屬性值也不存在，則會發生錯誤 --> <form:form action="${pageContext.request.contextPath}/emp" method="post" modelAttribute="employee"> <!-- path屬性對應html表單標簽的name屬性值。支持級聯屬性 --> <c:if test="$employee.id ==null"> LastName:<form:input path="lastName"/><br> </c:if> <c:if test="$employee.id !=null"> <form:hidden path="id" /> <!-- 對於_method不能使用form:hidden標簽，因為ModelAttribute對應的bean中沒有_method 這個屬性 --> <input type="hidden" name="_method" value="put" /> </c:if> Email:<form:input path="email"/><br> <% Map<String,String> genders = new HashMap(); genders.put("1","male"); genders.put("0", "female"); request.setAttribute("genders",genders); %> <!-- form:radiobuttons單選框組件標簽，用於構造多個單選框，當表單bean對應的屬性值和value值相等時，單選框被選中 --> Gender:<form:radiobuttons path="gender" items="${genders }"/> <br> <!-- items：可以使List，String[]或Map itemValue：指定value值，可以是集合中bean的一個屬性 itemLabel：指定label值 --> Department:<form:select path="department.id" items="${departments }" itemLabel="departementName" itemValue="id"></form:select> <input type="submit" value="Submit"/> </form:form> </body> </html>
SpringMVC學習之REST