Web Services(3)-使用CXF开发REST 服务

1. REST服务介绍

REST 全称是 Representational State Transfer (表述性状态转移), 它是Roy Fielding 博士在2000年写的一篇关于软件架构风格的论文, 简称REST 服务

REST 本质上是使用URL来访问资源的一种方式, 其中包括两部分: 请求方式和请求路径,  比较常见的请求方式是GET与POST但在REST中又有其余类型的请求方式, GET ,POST, PUT,DELETE,HEAD,OPTIONS，REST 是一个“无状态”的架构模式，任什么时候候能够由客户端发出请求到服务端，最终返回本身想要的数据,也就是说, 服务端将内部资源发布REST服务，客户端经过URL来访问这些资源

2.使用Spring+CXF发布REST服务

第一步：添加maven依赖:

<?xml version="1.0" encoding="UTF-8"?><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/xsd/maven-4.0.0.xsd">

    <modelVersion>4.0.0</modelVersion>

    <groupId>demo.ws</groupId>
    <artifactId>rest_spring_cxf</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>war</packaging>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <spring.version>4.0.6.RELEASE</spring.version>
        <cxf.version>3.0.0</cxf.version>
        <jackson.version>2.4.1</jackson.version>
    </properties>

    <dependencies>
        <!-- Spring -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <!-- CXF -->
        <dependency>
            <groupId>org.apache.cxf</groupId>
            <artifactId>cxf-rt-frontend-jaxrs</artifactId>
            <version>${cxf.version}</version>
        </dependency>
        <!-- Jackson -->
        <dependency>
            <groupId>com.fasterxml.jackson.jaxrs</groupId>
            <artifactId>jackson-jaxrs-json-provider</artifactId>
            <version>${jackson.version}</version>
        </dependency>
    </dependencies></project>

第二步:  配置web.xml

<?xml version="1.0" encoding="UTF-8"?><web-app 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"
         version="3.0">

    <!-- Spring -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:spring.xml</param-value>
    </context-param>
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <!-- CXF -->
    <servlet>
        <servlet-name>cxf</servlet-name>
        <servlet-class>org.apache.cxf.transport.servlet.CXFServlet</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>cxf</servlet-name>
        <url-pattern>/ws/*</url-pattern>
    </servlet-mapping></web-app>

第三步: 将接口实现类发布springbean

@Component
public class ProductServiceImpl implements ProductService {

    private static final List<Product> productList = new ArrayList<Product>();

    static {
        productList.add(new Product(1, "iphone6", 6500));
        productList.add(new Product(2, "iphone6s", 7000));
    }


    public List<Product> retrieveAllProducts() {
        return productList;
    }
}

第四步: 配置spring

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context-4.0.xsd">

       <context:component-scan base-package="com.*"/>

       <import resource="spring-cxf.xml"/>

</beans>

第五步：REST服务调用:

$(function() {
        $.ajax({            
            type: 'get',
            url: 'http://localhost:8080/ws/rest/products',
            dataType: 'json',
            success: function(data) {                
                 var template = $("#product_table_template").html();                
                 var render = Handlebars.compile(template);                
                 var html = render({
                    data: data
                });
                $('#product').html(html);
            }
        });
    });

3.总结

至此, 关于什么是REST服务，如何使用REST服务,与spring集成咱们已经学习完了,但愿对你们有帮助