SPRINGMVC Study Notes (v) a restful crud based

1.1. Overview

When a submitted form has a _method field , the POST request is converted to a hiddenhttpmethodfilter DELETE , PUT Request , Add @PathVariable annotations to make a RESTful -style CRUD

1.2. Configuration information

Xml

<?xml version= "1.0" encoding= "UTF-8"?
><web-app xmlns:xsi= "http://www.w3.org/2001/XMLSchema-instance" xmlns= "Http://java.sun.com/xml/ns/javaee" xsi:schemalocation= "Http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version = "3.0" ><!--the front controller of this Spring WEB application, responsible for handling all application requests --><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:spring-mvc.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><!--Configuration Hiddenhttpmethodfilter is able to  POST request to DELETE, PUT request--><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></web-app>

1.3. Effects

① adding employee information via POST request

② Change Employee information by PUT Request

③ Delete Employee information via delete request

④ Get full employee information via get request

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1.4. Code

Employee.java

Package Com.ibigsea.springmvc.model;public class Employee {private Integer id;private string name;private string email; private int sex;private Department department;public Employee (Integer ID, string name, string email, int sex,department de partment) {super (); this.id = Id;this.name = Name;this.email = Email;this.sex = sex;this.department = Department;} Public Employee () {super ();} Public Integer GetId () {return ID;} public void SetId (Integer id) {this.id = ID;} Public String GetName () {return name;} public void SetName (String name) {this.name = name;} Public String Getemail () {return email;} public void Setemail (String email) {this.email = email;} public int Getsex () {return sex;} public void setsex (int sex) {this.sex = sex;} Public Department getdepartment () {return Department;} public void Setdepartment (Department Department) {this.department = Department;} @Overridepublic String toString () {return "Employee [id=" + ID + ", name=" + name + ", email=" + email+ ", sex=" + Sex + " , department= "+ DEpartment + "]";}} 

Department.java

Package Com.ibigsea.springmvc.model;import Java.io.serializable;public class Department implements Serializable { Private static final Long Serialversionuid = 6881984318733090395l;private integer id;private String name;public integer ge TId () {return ID;} public void SetId (Integer id) {this.id = ID;} Public String GetName () {return name;} public void SetName (String name) {this.name = name;} @Overridepublic String toString () {return "Department [id=" + ID + ", name=" + name + "]";}}

Restfulcontroller.java

Package Com.ibigsea.springmvc.rest;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.ibigsea.springmvc.dao.departmentdao;import Com.ibigsea.springmvc.dao.employeedao;import com.ibigsea.springmvc.model.employee;/** * Search and delete based on restful style * @author Bigsea */@Controller @requestmapping ("/restful") public class Restfulcontroller {@Autowiredprivate EmployeeDAO EmployeeDAO, @Autowiredprivate Departmentdao departmentdao;/** * The name of the employee cannot be changed because of the change, * so by @ModelAttribute annotation, * indicates when the target method is run , first get the Employee object * Save the Employee object in Implicitmode * @param ID Employee ID * @param map actually passed in Implicitmode */@ModelAttributepublic void Getemploy EE (@RequEstparam (value= "id", required=false) Integer id,map<string,object> Map) {if (id! = NULL) {Map.put ("employee", Employeedao.getempbyid (ID));}} /** * View all employee information * @param map * @return */@RequestMapping ("/list") Public String list (map<string, object> map) {Map.put ("Emps", Employeedao.getall ()); return "List";} /** * Jump to Employee Join page * @param map * @return */@RequestMapping (value= "/add", Method=requestmethod.get) public String Add (map< String, object> map) {map.put ("depts", Departmentdao.getall ()), Map.put ("Action", "Add"); return "EMP";} /** * Join Employees * @param EMP * @return */@RequestMapping (value= "/add", method=requestmethod.post) public String Add (employee emp {if (EMP = = null) {return "EMP";} if (Emp.getdepartment (). getId () = null) {emp.setdepartment (Departmentdao.getdepartmentbyid (emp.getdepartment). GetId ()));} Employeedao.save (EMP); return "Redirect:/restful/list";} /** * Delete Employee information * @param ID * @return */@RequestMapping (value= "/delete/{id}", method=requestmethod.delete) public String Delete (@PathVarIable ("id") Integer ID) {Employeedao.delempbyid (ID); return "Redirect:/restful/list";} /** * Because the method of @ModelAttribute annotations is run first, * the employee information corresponding to the employee ID is obtained * and then the employee data obtained from the foreground is stored in the employee information obtained, * so that the name attribute is not required to obtain the value * @param emp * @r Eturn */@RequestMapping (value= "/edit", method=requestmethod.put) public String edit (Employee emp) {if (EMP = = null) { return "EMP";} if (Emp.getdepartment (). getId () = null) {emp.setdepartment (Departmentdao.getdepartmentbyid (emp.getdepartment). GetId ()));} Employeedao.save (EMP); return "Redirect:/restful/list";} /** * Jump to Employee change page * @param ID Employee ID * @param map implicitmode * @return */@RequestMapping (value= "/edit/{id}", method=requestm Ethod. GET) Public String edit (@PathVariable ("id") Integer id,map<string, object> Map) {map.put ("emp", Employeedao.getempbyid (ID)); Map.put ("Depts", Departmentdao.getall ()); Map.put ("Action", "edit"); return "EMP";}}

Employeedao.java

Package Com.ibigsea.springmvc.dao;import Java.util.collection;import Java.util.hashmap;import java.util.Map;import Org.springframework.stereotype.component;import Com.ibigsea.springmvc.model.department;import Com.ibigsea.springmvc.model.Employee; @Componentpublic class EmployeeDAO {private static map<integer,employee> Emps = new Hashmap<integer, employee> ();/** * Initialize employee information */static {emps.put (1001, New Employee (1001, "AA", "[email  protected] ", 0,new Department (101," JAVA ")); Emps.put (1002, New Employee (1002," BB "," [email protected] ", 0 , New Department (102, ". NET")), Emps.put (1003, New Employee (1003, "CC", "[email protected]", 1,new Department (103, "PHP")); Emps.put (1004, New Employee (1004, "DD", "[email protected]", 0,new Department (104, "C")));} private static int employeeId = 1005;/** * Save Employee Information * @param emp */public void Save (employee emp) {if (Emp.getid () = = null) { Emp.setid (employeeid++);} Emps.put (Emp.getid (), EMP);} /** * Get all employee information * @return */public Collection<emplOyee> GetAll () {return emps.values ();} /** * Get employee information based on ID * @param ID * @return */public employee Getempbyid (Integer ID) {return emps.get (ID);} /** * Delete employee information by ID * @param id */public void Delempbyid (Integer id) {emps.remove (id);}}

Departmentdao.java

Package Com.ibigsea.springmvc.dao;import Java.util.collection;import Java.util.hashmap;import java.util.Map;import Org.springframework.stereotype.component;import com.ibigsea.springmvc.model.Department; @Componentpublic class Departmentdao {public static Map<integer, department> depts = new Hashmap<integer, department> ();/** * Initialize Department letter */static {depts.put (101, New Department (101, "JAVA"));d Epts.put (102, New Department (102, ". NET"));d Epts.put (103, new Department (103, "PHP"));d Epts.put (104, New Department (104, "C"));} /** * Get all Department info * @return */public collection<department> getAll () {return depts.values ();} /** * Get department information by ID * @param ID * @return */public Department Getdepartmentbyid (Integer ID) {return depts.get (ID);}}

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" >
' Male ': ' Female '}</td> <td><a href= ' ${pagecontext.request.contextpath}/restful/edit/${emp.id} ' >Edit< /a></td> <td><form action= "${pagecontext.request.contextpath}/restful/delete/${emp.id}" method= "POST" > <input type= "hidden" name= "_method" value= "DELETE" > <input type= "Submit" value= "DELETE" > & lt;/form> </td> </tr> </c:forEach> </table> </c:if> <br><br>    ; <a href= "${pagecontext.request.contextpath}/restful/add" > Join Employees </a></body>

emp.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" >
1.5. Static resource issues
Because Dispatcherservlet is configured and all requests are intercepted , static resources are   not included in the Springmvc.xml Configuration
Mvc:default-servlet-handler
a defaultservlethttprequesthandleris defined in the springmvc context. It will screen for requests to enter the dispatcherservlet . Assuming that a request is not mapped, the request is handled by the WEB Application server's default  Servlet , assuming it is not a request for a static resource. Until the Dispatcherservlet continues to deal with it.
Mvc:annotation-driven
Will voluntarily register
Requestmappinghandlermapping
Requestmappinghandleradapter
Exceptionhandlerexceptionresolver of three beans. 
You'll be able to access static resources.
1.6. Mvc:annotation-drivenand theMvc:default-servlet-handler
Add mvc:annotation-driven when configuring the SPRINGMVC configuration file
<mvc:annotation-driven/> will voluntarily register three beans
2 requestmappinghandlermapping
2 Requestmappinghandleradapter
2 Exceptionhandlerexceptionresolver
The following support will also be provided:
– Support for type conversion of form parameters using Conversionservice instances
– Supports formatting of data types with @NumberFormat ,@DateTimeFormat annotations Complete
– Support for JSR 303 Validation of JavaBean instances using @Valid annotations
– Support for using @RequestBody and @ResponseBody annotations

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SPRINGMVC Study Notes (v) a restful crud based