Spring4 MVC+ AngularJS CRUD使用$http实例
这篇文章显示了使用Spring MVC4整合AngularJS。我们将创建一个使用后端和AngularJS作为前端的纯JSP封装Spring REST API一个CRUD应用程序， 使用 $http 服务与服务器异步通信。我们还将进行使用UI AngularJS表单验证各种验证。
在我们的应用程序，客户端是基于AngularJS和服务器端是基于Spring REST API。
只是为了学习的话，你可以在这里本例中使用的模板。 它是一个小型应用程序，这是不符合服务器交互。所以需要刷新页面重新加载数据。
但是不要担心。完整应用程序将开发会在这篇文章后，进一步详细开发和讲解。
现在让我们开始！
使用以下技术：
- Spring 4.2.0.RELEASE
- AngularJS 1.4.4
- Maven 3
- JDK 1.7
- Eclipse JUNO Service Release 2
- M2Eclipse plugin (Optional)
工程目录结构
提供相关依赖关系
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.yiibai.springmvc</groupId>
<artifactId>Spring4MVCAngularJSExample</artifactId>
<packaging>war</packaging>
<version>1.0.0</version>
<name>Spring4MVCAngularJSExample Maven Webapp</name> <properties>
<springframework.version>4.2.0.RELEASE</springframework.version>
<jackson.version>2.5.3</jackson.version>
</properties> <dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${springframework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>${springframework.version}</version>
</dependency> <dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>${jackson.version}</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency> </dependencies>
<build>
<pluginManagement>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>2.4</version>
<configuration>
<warSourceDirectory>src/main/webapp</warSourceDirectory>
<warName>Spring4MVCAngularJSExample</warName>
<failOnMissingWebXml>false</failOnMissingWebXml>
</configuration>
</plugin>
</plugins>
</pluginManagement> <finalName>Spring4MVCAngularJSExample</finalName>
</build>
</project>
1.客户端(前端)
这里的应用程序的客户端是基于AngularJS。如果你想学习AngularJs，那么不访看看我们的 AngularJS教程 可让你在最流行的JavaScript框架有一个了解认识。
创建AngularJS模块
模块是AngularJS应用中最重要的部分。AngularJS模块你可以认为是在Java中的包。它应用程序的容器有不同部分 - 控制器，服务器，过滤器，指令等。AngularJS可以组合某些功能/Javascript在一起在单个模块之下。
模块可用于通过AngularJS来引导应用程序。 通过传递模块名到 ng-app 指令，我们可以告诉AngularJS加载该模块的应用程序主入口点。
app.js
'use strict';
var App = angular.module('myApp',[]);
创建AngularJS服务和服务器进行通信
在我们的应用中，将与Spring REST API，例如基于后端服务器的方式进行通信。在基于AngularJS应用中，与服务器进行通信的首选方式是使用AngularJS内置的 $http 服务。 AngularJS$ http服务允许我们使用XHR[浏览器的XMLHttpRequest对象] API与服务器端点通信。
user_service.js
'use strict';
App.factory('UserService', ['$http', '$q', function($http, $q){
return {
fetchAllUsers: function() {
return $http.get('http://localhost:8080/Spring4MVCAngularJSExample/user/')
.then(
function(response){
return response.data;
},
function(errResponse){
console.error('Error while fetching users');
return $q.reject(errResponse);
}
);
},
createUser: function(user){
return $http.post('http://localhost:8080/Spring4MVCAngularJSExample/user/', user)
.then(
function(response){
return response.data;
},
function(errResponse){
console.error('Error while creating user');
return $q.reject(errResponse);
}
);
},
updateUser: function(user, id){
return $http.put('http://localhost:8080/Spring4MVCAngularJSExample/user/'+id, user)
.then(
function(response){
return response.data;
},
function(errResponse){
console.error('Error while updating user');
return $q.reject(errResponse);
}
);
},
deleteUser: function(id){
return $http.delete('http://localhost:8080/Spring4MVCAngularJSExample/user/'+id)
.then(
function(response){
return response.data;
},
function(errResponse){
console.error('Error while deleting user');
return $q.reject(errResponse);
}
);
}
};
}]);
创建AngularJS控制器
控制器是一个AngularJS应用的最有用的部分。这些是执行JavaScript函数/对象大多数用户界面相关的工作。它们可以被看作是驱动程序模型和视图的变化。它们是模型(在我们的应用程序中的数据)，和视图(无论用户看到在屏幕上以及与其交互)之间的网关。
user_controller.js
'use strict';
App.controller('UserController', ['$scope', 'UserService', function($scope, UserService) {
var self = this;
self.user={id:null,username:'',address:'',email:''};
self.users=[];
self.fetchAllUsers = function(){
UserService.fetchAllUsers()
.then(
function(d) {
self.users = d;
},
function(errResponse){
console.error('Error while fetching Currencies');
}
);
};
self.createUser = function(user){
UserService.createUser(user)
.then(
self.fetchAllUsers,
function(errResponse){
console.error('Error while creating User.');
}
);
};
self.updateUser = function(user, id){
UserService.updateUser(user, id)
.then(
self.fetchAllUsers,
function(errResponse){
console.error('Error while updating User.');
}
);
};
self.deleteUser = function(id){
UserService.deleteUser(id)
.then(
self.fetchAllUsers,
function(errResponse){
console.error('Error while deleting User.');
}
);
};
self.fetchAllUsers();
self.submit = function() {
if(self.user.id===null){
console.log('Saving New User', self.user);
self.createUser(self.user);
}else{
self.updateUser(self.user, self.user.id);
console.log('User updated with id ', self.user.id);
}
self.reset();
};
self.edit = function(id){
console.log('id to be edited', id);
for(var i = 0; i < self.users.length; i++){
if(self.users[i].id === id) {
self.user = angular.copy(self.users[i]);
break;
}
}
};
self.remove = function(id){
console.log('id to be deleted', id);
if(self.user.id === id) {//clean form if the user to be deleted is shown there.
self.reset();
}
self.deleteUser(id);
};
self.reset = function(){
self.user={id:null,username:'',address:'',email:''};
$scope.myForm.$setPristine(); //reset Form
};
}]);
Spring MVC应用程序的创建视图
在这里，我们在操作上有些传统，并用纯JSP封装我们上面写的所有的AngularJS代码。请注意，您可以使用其他FE技术，而不是JSP(Velocity模板为例)。我们还增加了bootstrap 以增强其外观和感觉。此外，我们也将进行必要的表单验证。
UserManagement.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
<title>AngularJS $http Example</title>
<style>
.username.ng-valid {
background-color: lightgreen;
}
.username.ng-dirty.ng-invalid-required {
background-color: red;
}
.username.ng-dirty.ng-invalid-minlength {
background-color: yellow;
} .email.ng-valid {
background-color: lightgreen;
}
.email.ng-dirty.ng-invalid-required {
background-color: red;
}
.email.ng-dirty.ng-invalid-email {
background-color: yellow;
} </style>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
<link href="<c:url value='/static/css/app.css' />" rel="stylesheet"></link>
</head>
<body ng-app="myApp" class="ng-cloak">
<div class="generic-container" ng-controller="UserController as ctrl">
<div class="panel panel-default">
<div class="panel-heading"><span class="lead">User Registration Form </span></div>
<div class="formcontainer">
<form ng-submit="ctrl.submit()" name="myForm" class="form-horizontal">
<input type="hidden" ng-model="ctrl.user.id" />
<div class="row">
<div class="form-group col-md-12">
<label class="col-md-2 control-lable" for="uname">Name</label>
<div class="col-md-7">
<input type="text" ng-model="ctrl.user.username" id="uname" class="username form-control input-sm" placeholder="Enter your name" required ng-minlength="3"/>
<div class="has-error" ng-show="myForm.$dirty">
<span ng-show="myForm.uname.$error.required">This is a required field</span>
<span ng-show="myForm.uname.$error.minlength">Minimum length required is 3</span>
<span ng-show="myForm.uname.$invalid">This field is invalid </span>
</div>
</div>
</div>
</div> <div class="row">
<div class="form-group col-md-12">
<label class="col-md-2 control-lable" for="address">Address</label>
<div class="col-md-7">
<input type="text" ng-model="ctrl.user.address" id="address" class="form-control input-sm" placeholder="Enter your Address. [This field is validation free]"/>
</div>
</div>
</div> <div class="row">
<div class="form-group col-md-12">
<label class="col-md-2 control-lable" for="email">Email</label>
<div class="col-md-7">
<input type="email" ng-model="ctrl.user.email" id="email" class="email form-control input-sm" placeholder="Enter your Email" required/>
<div class="has-error" ng-show="myForm.$dirty">
<span ng-show="myForm.email.$error.required">This is a required field</span>
<span ng-show="myForm.email.$invalid">This field is invalid </span>
</div>
</div>
</div>
</div> <div class="row">
<div class="form-actions floatRight">
<input type="submit" value="{{!ctrl.user.id ? 'Add' : 'Update'}}" class="btn btn-primary btn-sm" ng-disabled="myForm.$invalid">
<button type="button" ng-click="ctrl.reset()" class="btn btn-warning btn-sm" ng-disabled="myForm.$pristine">Reset Form</button>
</div>
</div>
</form>
</div>
</div>
<div class="panel panel-default">
<!-- Default panel contents -->
<div class="panel-heading"><span class="lead">List of Users </span></div>
<div class="tablecontainer">
<table class="table table-hover">
<thead>
<tr>
<th>ID.</th>
<th>Name</th>
<th>Address</th>
<th>Email</th>
<th width="20%"></th>
</tr>
</thead>
<tbody>
<tr ng-repeat="u in ctrl.users">
<td><span ng-bind="u.id"></span></td>
<td><span ng-bind="u.username"></span></td>
<td><span ng-bind="u.address"></span></td>
<td><span ng-bind="u.email"></span></td>
<td>
<button type="button" ng-click="ctrl.edit(u.id)" class="btn btn-success custom-width">Edit</button> <button type="button" ng-click="ctrl.remove(u.id)" class="btn btn-danger custom-width">Remove</button>
</td>
</tr>
</tbody>
</table>
</div>
</div>
</div> <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.4/angular.js"></script>
<script src="<c:url value='/static/js/app.js' />"></script>
<script src="<c:url value='/static/js/service/user_service.js' />"></script>
<script src="<c:url value='/static/js/controller/user_controller.js' />"></script>
</body>
</html>
2. 服务器端
创建REST控制器的Spring MVC应用程序
下面显示的是一个基于REST控制器。这相同于 Spring MVC中4 RESTful Web服务的CRUD例子+RestTemplate中的控制器。唯一的区别在于用户[模型对象]具有不同的特性，这是根据在本实例的用户界面。
package com.yiibai.springmvc.controller; import java.util.List; import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.util.UriComponentsBuilder; import com.yiibai.springmvc.model.User;
import com.yiibai.springmvc.service.UserService; @RestController
public class HelloWorldRestController { @Autowired
UserService userService; //Service which will do all data retrieval/manipulation work //-------------------Retrieve All Users-------------------------------------------------------- @RequestMapping(value = "/user/", method = RequestMethod.GET)
public ResponseEntity<List<User>> listAllUsers() {
List<User> users = userService.findAllUsers();
if(users.isEmpty()){
return new ResponseEntity<List<User>>(HttpStatus.NO_CONTENT);//You many decide to return HttpStatus.NOT_FOUND
}
return new ResponseEntity<List<User>>(users, HttpStatus.OK);
} //-------------------Retrieve Single User-------------------------------------------------------- @RequestMapping(value = "/user/{id}", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_VALUE)
public ResponseEntity<User> getUser(@PathVariable("id") long id) {
System.out.println("Fetching User with id " + id);
User user = userService.findById(id);
if (user == null) {
System.out.println("User with id " + id + " not found");
return new ResponseEntity<User>(HttpStatus.NOT_FOUND);
}
return new ResponseEntity<User>(user, HttpStatus.OK);
} //-------------------Create a User-------------------------------------------------------- @RequestMapping(value = "/user/", method = RequestMethod.POST)
public ResponseEntity<Void> createUser(@RequestBody User user, UriComponentsBuilder ucBuilder) {
System.out.println("Creating User " + user.getUsername()); if (userService.isUserExist(user)) {
System.out.println("A User with name " + user.getUsername() + " already exist");
return new ResponseEntity<Void>(HttpStatus.CONFLICT);
} userService.saveUser(user); HttpHeaders headers = new HttpHeaders();
headers.setLocation(ucBuilder.path("/user/{id}").buildAndExpand(user.getId()).toUri());
return new ResponseEntity<Void>(headers, HttpStatus.CREATED);
} //------------------- Update a User -------------------------------------------------------- @RequestMapping(value = "/user/{id}", method = RequestMethod.PUT)
public ResponseEntity<User> updateUser(@PathVariable("id") long id, @RequestBody User user) {
System.out.println("Updating User " + id); User currentUser = userService.findById(id); if (currentUser==null) {
System.out.println("User with id " + id + " not found");
return new ResponseEntity<User>(HttpStatus.NOT_FOUND);
} currentUser.setUsername(user.getUsername());
currentUser.setAddress(user.getAddress());
currentUser.setEmail(user.getEmail()); userService.updateUser(currentUser);
return new ResponseEntity<User>(currentUser, HttpStatus.OK);
} //------------------- Delete a User -------------------------------------------------------- @RequestMapping(value = "/user/{id}", method = RequestMethod.DELETE)
public ResponseEntity<User> deleteUser(@PathVariable("id") long id) {
System.out.println("Fetching & Deleting User with id " + id); User user = userService.findById(id);
if (user == null) {
System.out.println("Unable to delete. User with id " + id + " not found");
return new ResponseEntity<User>(HttpStatus.NOT_FOUND);
} userService.deleteUserById(id);
return new ResponseEntity<User>(HttpStatus.NO_CONTENT);
} //------------------- Delete All Users -------------------------------------------------------- @RequestMapping(value = "/user/", method = RequestMethod.DELETE)
public ResponseEntity<User> deleteAllUsers() {
System.out.println("Deleting All Users"); userService.deleteAllUsers();
return new ResponseEntity<User>(HttpStatus.NO_CONTENT);
} }
创建Spring MVC应用程序的主控制器
这这将成为我们的主页一个简单的控制器。
package com.yiibai.springmvc.controller; import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod; @Controller
@RequestMapping("/")
public class IndexController { @RequestMapping(method = RequestMethod.GET)
public String getIndexPage() {
return "UserManagement";
}
}
创建基于Spring事务来处理用户的相关操作
package com.yiibai.springmvc.service;
import java.util.List;
import com.yiibai.springmvc.model.User; public interface UserService { User findById(long id); User findByName(String name); void saveUser(User user); void updateUser(User user); void deleteUserById(long id); List<User> findAllUsers(); void deleteAllUsers(); public boolean isUserExist(User user); }
package com.yiibai.springmvc.service; import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.concurrent.atomic.AtomicLong; import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional; import com.yiibai.springmvc.model.User; @Service("userService")
@Transactional
public class UserServiceImpl implements UserService{ private static final AtomicLong counter = new AtomicLong(); private static List<User> users; static{
users= populateDummyUsers();
} public List<User> findAllUsers() {
return users;
} public User findById(long id) {
for(User user : users){
if(user.getId() == id){
return user;
}
}
return null;
} public User findByName(String name) {
for(User user : users){
if(user.getUsername().equalsIgnoreCase(name)){
return user;
}
}
return null;
} public void saveUser(User user) {
user.setId(counter.incrementAndGet());
users.add(user);
} public void updateUser(User user) {
int index = users.indexOf(user);
users.set(index, user);
} public void deleteUserById(long id) { for (Iterator<User> iterator = users.iterator(); iterator.hasNext(); ) {
User user = iterator.next();
if (user.getId() == id) {
iterator.remove();
}
}
} public boolean isUserExist(User user) {
return findByName(user.getUsername())!=null;
} public void deleteAllUsers(){
users.clear();
} private static List<User> populateDummyUsers(){
List<User> users = new ArrayList<User>();
users.add(new User(counter.incrementAndGet(),"Sam", "NY", "sam@abc.com"));
users.add(new User(counter.incrementAndGet(),"Tomy", "ALBAMA", "tomy@abc.com"));
users.add(new User(counter.incrementAndGet(),"Kelly", "NEBRASKA", "kelly@abc.com"));
return users;
} }
创建模型 - Model
package com.yiibai.springmvc.model;
public class User {
private long id;
private String username;
private String address;
private String email;
public User(){
id=0;
}
public User(long id, String username, String address, String email){
this.id = id;
this.username = username;
this.address = address;
this.email = email;
}
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + (int) (id ^ (id >>> 32));
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (!(obj instanceof User))
return false;
User other = (User) obj;
if (id != other.id)
return false;
return true;
}
@Override
public String toString() {
return "User [id=" + id + ", username=" + username + ", address=" + address
+ ", email=" + email + "]";
}
}
创建Spring配置文件类
package com.yiibai.springmvc.configuration; import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.ViewResolverRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
import org.springframework.web.servlet.view.JstlView; @Configuration
@EnableWebMvc
@ComponentScan(basePackages = "com.yiibai.springmvc")
public class HelloWorldConfiguration extends WebMvcConfigurerAdapter{ @Override
public void configureViewResolvers(ViewResolverRegistry registry) {
InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();
viewResolver.setViewClass(JstlView.class);
viewResolver.setPrefix("/WEB-INF/views/");
viewResolver.setSuffix(".jsp");
registry.viewResolver(viewResolver);
} @Override
public void addResourceHandlers(ResourceHandlerRegistry registry) {
registry.addResourceHandler("/static/**").addResourceLocations("/static/");
} }
创建Spring初始化器类
看看我们是如何注册CORS过滤器，Spring配置，这将帮助我们避免同源策略的问题。
package com.yiibai.springmvc.configuration;
import javax.servlet.Filter;
import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;
public class HelloWorldInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {
@Override
protected Class<?>[] getRootConfigClasses() {
return new Class[] { HelloWorldConfiguration.class };
}
@Override
protected Class<?>[] getServletConfigClasses() {
return null;
}
@Override
protected String[] getServletMappings() {
return new String[] { "/" };
}
@Override
protected Filter[] getServletFilters() {
Filter [] singleton = { new CORSFilter() };
return singleton;
}
}
创建过滤器处理同源策略相关的问题
package com.yiibai.springmvc.configuration; import java.io.IOException; import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletResponse; public class CORSFilter implements Filter { public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
System.out.println("Filtering on...........................................................");
HttpServletResponse response = (HttpServletResponse) res;
response.setHeader("Access-Control-Allow-Origin", "*");
response.setHeader("Access-Control-Allow-Methods", "POST, GET, PUT, OPTIONS, DELETE");
response.setHeader("Access-Control-Max-Age", "3600");
response.setHeader("Access-Control-Allow-Headers", "x-requested-with, Content-Type");
chain.doFilter(req, res);
} public void init(FilterConfig filterConfig) {} public void destroy() {} }
部署和运行
现在构建war(无论是在Eclipse中，如提到的前面的教程)或通过Maven的命令行(mvn clean install)。部署 war 到Servlet3.0容器。
打开浏览器，浏览：http://localhost:8080/Spring4MVCAngularJSExample/
详细填写添加一个新用户
点击添加，用户应该以异步方式添加。
点击删除用户，用户应异步删除，这里删除了第一条。
点击编辑的用户，用户的详细信息应显示在表格。并根据需要更新详细信息。
现在点击更新，用户应异步更新。
由于AngularJS表单验证，如果试图不按要求提供输入，你会看到验证错误如下图所示。
就这样(包教不包会)！
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