[4] Spring MVC Learning Notes

User management based on spring MVC

In-depth understanding of spring MVC based on practical small projects

1. First, the user class

public class User {private int id;private string Username;private string Password;private string Nickname;private string E Mail;        Omitting constructors and get, set methods        }

2. Then the preparation of Usercontroller

Some notes:

(1). Two ways to jump, server-side jump (with parameters) return "Redirect:/user/users"; and return the relevant error message and the client jumps (understanding redirect) return "User/add";

(2). Returns information to the view layer through the model object;

(3). Get and post requests are handled separately;

(4). Related validate verification, need to import Bean-validate.jar package, the following javabean in detail.

Package Com.qzp.web;import Java.util.hashmap;import Java.util.map;import Org.springframework.stereotype.Controller ; Import Org.springframework.ui.model;import Org.springframework.validation.bindingresult;import Org.springframework.validation.annotation.validated;import Org.springframework.web.bind.annotation.requestmapping;import Org.springframework.web.bind.annotation.requestmethod;import Com.qzp.model.User; @Controller @requestmapping ("/    User ") public class Usercontroller {private Map<string, user> users = new hashmap<string, user> ();        Public Usercontroller () {users.put ("Sdy", New User (1, "Sdy", "123", "Song Dongno", "[email protected]"));        Users.put ("LDH", New User (2, "LDH", "123", "Andy Lau", "[email protected]"));        Users.put ("GFC", New User (3, "GFC", "123", "Aaron Kwok", "[email protected]"));        Users.put ("LM", New User (4, "LM", "123", "Dawn", "[email protected]"));    Users.put ("Zxy", New User (5, "Zxy", "123", "Jacky", "[email protected]")); }//List page   @RequestMapping (value= "/users", method = requestmethod.get) public String list (model model) {Model.addattribut        E ("Users", users);    return "User/list";         }//link to the Add page will use this code @RequestMapping (value= "/add", method = Requestmethod.get) public String Add (model model) {        Open Modeldriven Model.addattribute (New User ());    return "User/add";    }//In the specific add user, is a POST request, access the following code @RequestMapping (value= "/add", method = Requestmethod.post)//must follow validate write authentication class Public String Add (@Validated User user,bindingresult br) {//If there is an error directly jump to the Add view if (Br.haserrors ()) {return "User    /add ";    } users.put (User.getusername (), user);           return "Redirect:/user/users"; }  }

3. Given the additional information, there should be a server-side validation, so import the Bean-validate.jar package here and modify the user file

Package Com.qzp.model;import Javax.validation.constraints.size;import Org.hibernate.validator.constraints.Email; Import Org.hibernate.validator.constraints.notempty;public class User {private int id;private String username;private String Password;private string Nickname;private string Email;public User () {super ();} public User (int ID, string username, string password, string nickname,string email) {super (); this.id = Id;this.username = Username;this.password = Password;this.nickname = Nickname;this.email = email;} public int getId () {return ID;} public void setId (int id) {this.id = ID;} @NotEmpty (message= "username cannot be empty! ") Public String GetUserName () {return username;} public void Setusername (String username) {this.username = username;} @Size (min=1,max=10,message= "password is greater than 1 bit less than 10 bits!) ") Public String GetPassword () {return password;} public void SetPassword (String password) {this.password = password;} @Email (message= "Mailbox is not formatted correctly! ") Public String Getemail () {return email;} public void Setemail (String email) {This.email = email;} Public String Getnickname () {return nickname;} public void Setnickname (String nickname) {this.nickname = nickname;}}

4. View layer, first list page

Jstl Tag Library to introduce, here is an iteration tag, spring MVC does not own a set of tag library, so this side is still used Strust2

Users is a map object, so you get the value through his key.

<%@ page language= "java" import= "java.util.*" pageencoding= "UTF-8"%><% @taglib prefix= "C" uri= "/HTTP/ Java.sun.com/jsp/jstl/core "%><! DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" >
(Display user Name list page) execution results are as follows:
5. Next to the Add page
Also import the Spring form tag Library, if the verification information does not pass, will prompt the information
<%@ page language= "java" import= "java.util.*" pageencoding= "UTF-8"%><%@ taglib prefix= "SF" uri= "/HTTP/ Www.springframework.org/tags/form "%>
The result of the Add page, if added successfully, will jump to the User/list page.


[4] Spring MVC Learning Notes