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Spring MVC 4 RESTFul Web Services CRUD例子(带源码)【这才是restful,超经典】

【本系列其他教程正在陆续翻译中,点击分类:spring 4 mvc 进行查看。源码下载地址在文章末尾。

 

【翻译 by 明明如月 QQ 605283073】

原文地址:http://websystique.com/springmvc/spring-mvc-4-restful-web-services-crud-example-resttemplate/

 

上一篇: 

 

Spring 4 MVC @RestController 注解实现REST Service

下一篇:Spring MVC 4 文件上传下载 Hibernate+MySQL例子 (带源码)

 

本文非常好,推荐大家好好看看,很多人理解的restful不对

本文我们将使用Spring MVC 4实现 CRUD Restful WebService , 通过RestTemplate写一个 REST 客户端,定义这些服务. 我们也可以通过外部的一些客户端来测试这些服务。

 

 

简短 & 快速介绍REST

REST表示 Representational State Transfer(表示性状态转换).

 

它是可以用来设计web services的框架,可以被不同的客户端调用。

核心思想是:使用简单的HTTP协议来实现调用,而不是CORBA, RPC 或者 SOAP等负责的机制。

 

在Rest 基础设计中,资源使用以下动词进行操作。

 

  • 创建资源 : 使用 HTTP POST
  • 获取资源 : 使用 HTTP GET
  • 更新资源 : 使用 HTTP PUT 
  • 删除资源 : 使用 HTTP DELETE 

也意味着,你作为Rest 服务开发者或者客户,应该遵循以上的标准。

 

 

尽管没有限制必须返回的类型,但是一般基于Web services的Rest返回JSON或者XML作为响应。

 

客户端可以指定(使用HTTP Accept header)他们想要的资源类型吗,服务器返回需要的资源。

指明资源的Content-Type。如果想详细的理解 restful可以参考这里:StackOverflow link 

 

 

基于Rest的Controller(控制器)

我们的 REST API :

  • GET 方式请求 /api/user/ 返回用户列表
  • GET 方式请求 /api/user/1返回id为1的用户
  • POST 方式请求 /api/user/ 通过user对象的JSON 参数创建新的user对象
  • PUT 方式请求 /api/user/3 更新id为3的发送json格式的用户对象 
  • DELETE 方式请求/api/user/4删除 ID为 4的user对象
  • DELETE 方式请求/api/user/删除所有user
package com.websystique.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.websystique.springmvc.model.User;
import com.websystique.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.getName());
 
        if (userService.isUserExist(user)) {
            System.out.println("A User with name " + user.getName() + " 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.setName(user.getName());
        currentUser.setAge(user.getAge());
        currentUser.setSalary(user.getSalary());
         
        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);
    }
 
}

详解:

@RestController :首先我们使用的是Spring 4的新注解 @RestController注解. 

此注解避免了每个方法都要加上@ResponseBody注解。也就是说@RestController 自己戴上了 @ResponseBody注解,看以看作是

 @Controller 和 @ResponseBody的结合体

@RequestBody : 如果方法参数被 @RequestBody注解,Spring将绑定HTTP请求体到那个参数上。如果那样做,Spring将根据请求中的ACCEPT或者 Content-Type header(私下)使用 HTTP Message converters 来将http请求体转化为domain对象。

 

@ResponseBody : 如果方法加上了@ResponseBody注解,Spring返回值到响应体。如果这样做的话,Spring将根据请求中的 Content-Type header(私下)使用 HTTP Message converters 来将domain对象转换为响应体。

 

ResponseEntity 是一个真实数据.它代表了整个 HTTP 响应(response). 它的好处是你可以控制任何对象放到它内部。

你可以指定状态码、头信息和响应体。它包含你想要构建HTTP Response 的信息。

@PathVariable 此注解意味着一个方法参数应该绑定到一个url模板变量[在'{}’里的一个]

一般来说你,要实现REST API in Spring 4 需要了解@RestController , @RequestBody, ResponseEntity 和 @PathVariable 这些注解 .另外, spring 也提供了一些支持类帮助你实现一些可定制化的东西。

MediaType : 带着 @RequestMapping 注解,通过特殊的控制器方法你可以额外指定,MediaType来生产或者消耗。

 

发布和测试此API

 http://localhost:8080/Spring4MVCCRUDRestService.

 

想要测试此API,我将使用POSTMAN这个外部客户端,接下来我们也将写我们自己的客户端。

1. 获取所有用户

 

打开 POSTMAN工具,选择请求类型为GET,指明uri

Spring MVC 4 RESTFul Web Services CRUD例子(带源码)【这才是restful,超经典】插图

 

注意:我们没有指明任何HTTP头。点击 发送,将接收到所有用户的列表

 

Spring MVC 4 RESTFul Web Services CRUD例子(带源码)【这才是restful,超经典】插图1

 

也要注意HTTP 200 响应。

Spring MVC 4 RESTFul Web Services CRUD例子(带源码)【这才是restful,超经典】插图2

 

你也许好奇为什么此响应通过JSON字符串发送的,在响应里的Content-Type 头说明了这个。

因为我们添加了JACKSON

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.5.3</version>
</dependency

因为Spring在类路径发现了这个库,它调用了内置的MappingJackson2HttpMessageConverter 转换器将响应(对象集合)转换为JSON格式。

 Spring内置转换器的好处是,大部分情况下只要把库放到类路径,即可完成转换。当然了有时候我们也需要

采用我们的API。比如,如果我们像也提供XML格式的话,我们需要对User类加上JAXB注解。

 

2. 获取单个用户

 

GET方式 指定/user/1 

 

Spring MVC 4 RESTFul Web Services CRUD例子(带源码)【这才是restful,超经典】插图3

现在试着发送一个带有错误识别码的GET请求,将收到一个HTTP 404

Spring MVC 4 RESTFul Web Services CRUD例子(带源码)【这才是restful,超经典】插图4

 

3.创建一个 User

选择POST方法,指明uri /user/ 指明POSTMAN Body选项卡,选择application/json类型

Spring MVC 4 RESTFul Web Services CRUD例子(带源码)【这才是restful,超经典】插图5

 你要注意POSTMAN自动添加了Content-Type 头信息

Spring MVC 4 RESTFul Web Services CRUD例子(带源码)【这才是restful,超经典】插图6

 

记住: Accept header包含client能给识别的类型。 Content-Type header表示数据的实际类型。

 

点击发送以后 将收到 HTTP 200 没有响应体(api里面没有在响应体发送任何东西)

Spring MVC 4 RESTFul Web Services CRUD例子(带源码)【这才是restful,超经典】插图7

 

你可以查询新创建的用户

Spring MVC 4 RESTFul Web Services CRUD例子(带源码)【这才是restful,超经典】插图8

 

这是实现REST的普通实现方式。但是也没人阻止你为POST或者PUT方式响应体里发送内容。但是这还是REST 的API?值得怀疑。

不管怎样,我们试着创建同一个用户时,你将获得HTTP冲突的响应。

Spring MVC 4 RESTFul Web Services CRUD例子(带源码)【这才是restful,超经典】插图9

 

4.更新用户

发送一个HTTP PUT 请求来更新用户。

Spring MVC 4 RESTFul Web Services CRUD例子(带源码)【这才是restful,超经典】插图10

注意:这次我们接收到了响应体。这是因为在控制器的方法实现里我们发送了数据。再次强调,有的人也许不在响应体里面发送更新的详情,只发送位置头(和创建用户一样)。

5.删除用户

Spring MVC 4 RESTFul Web Services CRUD例子(带源码)【这才是restful,超经典】插图11

6 删除所有用户

Spring MVC 4 RESTFul Web Services CRUD例子(带源码)【这才是restful,超经典】插图12

7.删除用户后验证

Spring MVC 4 RESTFul Web Services CRUD例子(带源码)【这才是restful,超经典】插图13

 

根据RestTemplate 写REST Client  

 

Postman是测试Rest Api的超好用的工具,但是如果你想完整的消化REST,可以尝试自己写一个。

最出名的Htpp 客户端是HttpClient( Apache HttpComponents )。

但是用它来访问REST service则相对少见。

Spring的 RestTemplate随之出现。RestTemplate 提供了高级方法,来响应者6种主要的HTTP方法。

 

HTTP 方法和对应的 RestTemplate方法:

 

  • HTTP GET : getForObject, getForEntity
  • HTTP PUT : put(String url, Object request, String…​urlVariables)
  • HTTP DELETE : delete
  • HTTP POST : postForLocation(String url, Object request, String…​ urlVariables), postForObject(String url, Object request, ClassresponseType, String…​ uriVariables)
  • HTTP HEAD : headForHeaders(String url, String…​ urlVariables)
  • HTTP OPTIONS : optionsForAllow(String url, String…​ urlVariables)
  • HTTP PATCH and others : exchange execute

定义 Rest client , 定义REST services 

package com.websystique.springmvc;
 
import java.net.URI;
import java.util.LinkedHashMap;
import java.util.List;
 
import org.springframework.web.client.RestTemplate;
 
import com.websystique.springmvc.model.User;
 
public class SpringRestTestClient {
 
    public static final String REST_SERVICE_URI = "http://localhost:8080/Spring4MVCCRUDRestService";
     
    /* GET */
    @SuppressWarnings("unchecked")
    private static void listAllUsers(){
        System.out.println("Testing listAllUsers API-----------");
         
        RestTemplate restTemplate = new RestTemplate();
        List<LinkedHashMap<String, Object>> usersMap = restTemplate.getForObject(REST_SERVICE_URI+"/user/", List.class);
         
        if(usersMap!=null){
            for(LinkedHashMap<String, Object> map : usersMap){
                System.out.println("User : id="+map.get("id")+", Name="+map.get("name")+", Age="+map.get("age")+", Salary="+map.get("salary"));;
            }
        }else{
            System.out.println("No user exist----------");
        }
    }
     
    /* GET */
    private static void getUser(){
        System.out.println("Testing getUser API----------");
        RestTemplate restTemplate = new RestTemplate();
        User user = restTemplate.getForObject(REST_SERVICE_URI+"/user/1", User.class);
        System.out.println(user);
    }
     
    /* POST */
    private static void createUser() {
        System.out.println("Testing create User API----------");
        RestTemplate restTemplate = new RestTemplate();
        User user = new User(0,"Sarah",51,134);
        URI uri = restTemplate.postForLocation(REST_SERVICE_URI+"/user/", user, User.class);
        System.out.println("Location : "+uri.toASCIIString());
    }
 
    /* PUT */
    private static void updateUser() {
        System.out.println("Testing update User API----------");
        RestTemplate restTemplate = new RestTemplate();
        User user  = new User(1,"Tomy",33, 70000);
        restTemplate.put(REST_SERVICE_URI+"/user/1", user);
        System.out.println(user);
    }
 
    /* DELETE */
    private static void deleteUser() {
        System.out.println("Testing delete User API----------");
        RestTemplate restTemplate = new RestTemplate();
        restTemplate.delete(REST_SERVICE_URI+"/user/3");
    }
 
 
    /* DELETE */
    private static void deleteAllUsers() {
        System.out.println("Testing all delete Users API----------");
        RestTemplate restTemplate = new RestTemplate();
        restTemplate.delete(REST_SERVICE_URI+"/user/");
    }
 
    public static void main(String args[]){
        listAllUsers();
        getUser();
        createUser();
        listAllUsers();
        updateUser();
        listAllUsers();
        deleteUser();
        listAllUsers();
        deleteAllUsers();
        listAllUsers();
    }
}

重启服务器,运行上面的程序。

下面是输出:

Testing listAllUsers API-----------
User : id=1, Name=Sam, Age=30, Salary=70000.0
User : id=2, Name=Tom, Age=40, Salary=50000.0
User : id=3, Name=Jerome, Age=45, Salary=30000.0
User : id=4, Name=Silvia, Age=50, Salary=40000.0
Testing getUser API----------
User [id=1, name=Sam, age=30, salary=70000.0]
Testing create User API----------
Location : http://localhost:8080/Spring4MVCCRUDRestService/user/5
Testing listAllUsers API-----------
User : id=1, Name=Sam, Age=30, Salary=70000.0
User : id=2, Name=Tom, Age=40, Salary=50000.0
User : id=3, Name=Jerome, Age=45, Salary=30000.0
User : id=4, Name=Silvia, Age=50, Salary=40000.0
User : id=5, Name=Sarah, Age=51, Salary=134.0
Testing update User API----------
User [id=1, name=Tomy, age=33, salary=70000.0]
Testing listAllUsers API-----------
User : id=1, Name=Tomy, Age=33, Salary=70000.0
User : id=2, Name=Tom, Age=40, Salary=50000.0
User : id=3, Name=Jerome, Age=45, Salary=30000.0
User : id=4, Name=Silvia, Age=50, Salary=40000.0
User : id=5, Name=Sarah, Age=51, Salary=134.0
Testing delete User API----------
Testing listAllUsers API-----------
User : id=1, Name=Tomy, Age=33, Salary=70000.0
User : id=2, Name=Tom, Age=40, Salary=50000.0
User : id=4, Name=Silvia, Age=50, Salary=40000.0
User : id=5, Name=Sarah, Age=51, Salary=134.0
Testing all delete Users API----------
Testing listAllUsers API-----------
No user exist----------

完整的例子

Spring MVC 4 RESTFul Web Services CRUD例子(带源码)【这才是restful,超经典】插图14

 

更新pom.xml添加项目依赖

<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.websystique.springmvc</groupId>
  <artifactId>Spring4MVCCRUDRestService</artifactId>
  <packaging>war</packaging>
  <version>1.0.0</version>
  <name>Spring4MVCCRUDRestService 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>
             
    </dependencies>
 
 
    <build>
        <pluginManagement>
            <plugins>
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <version>3.2</version>
                    <configuration>
                        <source>1.7</source>
                        <target>1.7</target>
                    </configuration>
                </plugin>
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-war-plugin</artifactId>
                    <version>2.4</version>
                    <configuration>
                        <warSourceDirectory>src/main/webapp</warSourceDirectory>
                        <warName>Spring4MVCCRUDRestService</warName>
                        <failOnMissingWebXml>false</failOnMissingWebXml>
                    </configuration>
                </plugin>
            </plugins>
        </pluginManagement>
 
        <finalName>Spring4MVCCRUDRestService</finalName>
    </build>
</project>

 

User Service

package com.websystique.springmvc.service;
 
import java.util.List;
 
import com.websystique.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.websystique.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.websystique.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.getName().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.getName())!=null;
    }
 
    private static List<User> populateDummyUsers(){
        List<User> users = new ArrayList<User>();
        users.add(new User(counter.incrementAndGet(),"Sam",30, 70000));
        users.add(new User(counter.incrementAndGet(),"Tom",40, 50000));
        users.add(new User(counter.incrementAndGet(),"Jerome",45, 30000));
        users.add(new User(counter.incrementAndGet(),"Silvia",50, 40000));
        return users;
    }
 
    public void deleteAllUsers() {
        users.clear();
    }
 
}

 

Model (模型)类

package com.websystique.springmvc.model;
 
public class User {
 
    private long id;
     
    private String name;
     
    private int age;
     
    private double salary;
 
    public User(){
        id=0;
    }
     
    public User(long id, String name, int age, double salary){
        this.id = id;
        this.name = name;
        this.age = age;
        this.salary = salary;
    }
     
    public long getId() {
        return id;
    }
 
    public void setId(long id) {
        this.id = id;
    }
 
    public String getName() {
        return name;
    }
 
    public void setName(String name) {
        this.name = name;
    }
 
    public int getAge() {
        return age;
    }
 
    public void setAge(int age) {
        this.age = age;
    }
 
    public double getSalary() {
        return salary;
    }
 
    public void setSalary(double salary) {
        this.salary = salary;
    }
 
    @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 (getClass() != obj.getClass())
            return false;
        User other = (User) obj;
        if (id != other.id)
            return false;
        return true;
    }
 
    @Override
    public String toString() {
        return "User [id=" + id + ", name=" + name + ", age=" + age
                + ", salary=" + salary + "]";
    }
 
 
}

 

配置类

package com.websystique.springmvc.configuration;
 
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
 
@Configuration
@EnableWebMvc
@ComponentScan(basePackages = "com.websystique.springmvc")
public class HelloWorldConfiguration {
     
 
}

 

初始化类

package com.websystique.springmvc.configuration;
 
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[] { "/" };
    }
  
}

 

为你的REST API添加CORS支持

当访问REST API时,你可能需要面对“同源策略”问题。

错误如下:

” No ‘Access-Control-Allow-Origin’ header is present on the requested resource. Origin ‘http://127.0.0.1:8080′ is therefore not allowed access.” OR
” XMLHttpRequest cannot load http://abc.com/bla. Origin http://localhost:12345 is not allowed by Access-Control-Allow-Origin.”

 

一般来说,在服务器端,我们在响应中返回额外的CORS访问控制头,实现跨域链接。

 Spring的话,我么可以写一个简单的过滤器为每个响应添加CORS特征头。

package com.websystique.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");
        chain.doFilter(req, res);
    }
 
    public void init(FilterConfig filterConfig) {}
 
    public void destroy() {}
 
}

 

需要将其添加在Spring 配置中:

package com.websystique.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;
    }
  
}

 

源码下载:http://websystique.com/?smd_process_download=1&download_id=1689

源码(带CORS)下载:http://websystique.com/?smd_process_download=1&download_id=1890

 

特别说明:此系列教程有的童鞋下载下来运行 经常404 或者改成xml方式以后

缺少org.springframework.web.context.ContextLoaderServlet

 

参见:http://blog.csdn.net/w605283073/article/details/52126347

 

 

 

—————————————————-

我在参见 CSDN 1024 程序员活动(2019年10月24日截止)

如果我的博客对你有帮助,且有时间,欢迎浏览器或者微信扫码,帮我点赞支持我:

Spring MVC 4 RESTFul Web Services CRUD例子(带源码)【这才是restful,超经典】插图15

 

 

原文链接:https://blog.csdn.net/w605283073/article/details/51338765

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