Spring 4 集成Apache CXF开发JAX-RS Web Service

什么是JAX-RS

在JSR-311规范中定义，即Java API for RESTful Web Services，一套Java API，用于开发 RESTful风格的Webservice。

工程概况

主要功能：用户增删改查controller(not RESTful，懒得改了) + 查询用户webservice(RESTful)

框架：spring+spring mvc+mybatis

数据库：mysql

构建工具：maven

创建工程

使用IDE创建一个maven工程，pom.xml文件如下,引入cxf、spring、mybatis等依赖，添加tomcat-maven插件:

<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>cn.edu.hdu.wsdemo</groupId>
    <artifactId>wsdemo</artifactId>
    <packaging>war</packaging>
    <version>0.0.1-SNAPSHOT</version>
    <name>wsdemo Maven Webapp</name>
    <url>http://maven.apache.org</url>

    <properties>
        <cxf.version>3.0.3</cxf.version>
        <httpclient.version>3.1</httpclient.version>
        <jax.ws.rs>2.0.1</jax.ws.rs>
        <spring.version>4.1.4.RELEASE</spring.version>
        <mybatis.version>3.2.8</mybatis.version>
        <jackson.version>1.1.1</jackson.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>
        <!-- http://mvnrepository.com/artifact/org.slf4j/slf4j-api -->
        <!-- Simple Logging Facade for Java，简单日志门面 ，允许最终用户在部署其应用时使用其所希望的日志系统，本身并不是日志解决方案 -->
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.7.21</version>
        </dependency>
        <!-- http://mvnrepository.com/artifact/org.slf4j/slf4j-log4j12 -->
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>1.7.21</version>
        </dependency>
        <!-- http://mvnrepository.com/artifact/log4j/log4j -->
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>
        <!-- http://mvnrepository.com/artifact/com.google.code.gson/gson -->
        <dependency>
            <groupId>com.google.code.gson</groupId>
            <artifactId>gson</artifactId>
            <version>2.6.2</version>
        </dependency>
        <!-- http://mvnrepository.com/artifact/org.apache.commons/commons-lang3 -->
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.4</version>
        </dependency>

        <!--spring -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context-support</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.8.7</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.0.15</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.38</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>${mybatis.version}</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.2.5</version>
        </dependency>


        <dependency>
            <groupId>org.apache.cxf</groupId>
            <artifactId>cxf-rt-frontend-jaxrs</artifactId>
            <version>${cxf.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.cxf</groupId>
            <artifactId>cxf-rt-transports-http</artifactId>
            <version>${cxf.version}</version>
        </dependency>

        <dependency>
            <groupId>org.apache.cxf</groupId>
            <artifactId>cxf-rt-rs-service-description</artifactId>
            <version>${cxf.version}</version>
        </dependency>

        <dependency>
            <groupId>commons-httpclient</groupId>
            <artifactId>commons-httpclient</artifactId>
            <version>${httpclient.version}</version>
        </dependency>
        <dependency>
            <groupId>javax.ws.rs</groupId>
            <artifactId>javax.ws.rs-api</artifactId>
            <version>${jax.ws.rs}</version>
        </dependency>
        <dependency>
            <groupId>org.codehaus.jackson</groupId>
            <artifactId>jackson-jaxrs</artifactId>
            <version>${jackson.version}</version>
        </dependency>



    </dependencies>
    <build>
        <finalName>wsdemo</finalName>
        <plugins>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.0</version>
                <configuration>
                    <source>1.7</source>
                    <target>1.7</target>
                    <encoding>UTF-8</encoding>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.tomcat.maven</groupId>
                <artifactId>tomcat7-maven-plugin</artifactId>
                <version>2.1</version>
            </plugin>


        </plugins>
    </build>
</project>

关于spring+spring mvc+mybatis框架的相关配置就不细说了，这里主要关注与CXF相关的配置。

首先，是在web.xml添加一个servlet,拦截Web Service的请求：

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

然后，配置jaxrs:server：

    <bean id="userWSService" class="cn.edu.hdu.wsdemo.wsservice.UserWSService"></bean>
    <bean id="jsonProvider" class="org.codehaus.jackson.jaxrs.JacksonJsonProvider" />

    <jaxrs:server id="users" address="/apis">
        <jaxrs:serviceBeans>
            <ref bean="userWSService" />
        </jaxrs:serviceBeans>
        <jaxrs:providers>
            <ref bean='jsonProvider' />
        </jaxrs:providers>
    </jaxrs:server>

最后，编写我们的webservice具体实现：

package cn.edu.hdu.wsdemo.wsservice;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.ws.rs.Consumes;
import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;

import org.springframework.beans.factory.annotation.Autowired;

import cn.edu.hdu.wsdemo.model.User;
import cn.edu.hdu.wsdemo.service.user.IUserService;

@Path("/userwsservice/")
@Consumes(MediaType.APPLICATION_JSON)
@Produces(MediaType.APPLICATION_JSON)
public class UserWSService
{

    @Autowired
    private IUserService userService;

    @GET
    @Path("/users/{id}/")
    public User getUser(@PathParam("id") String id)
    {
        Map<String, Object> param = new HashMap<String, Object>();
        param.put("id", id);
        List<User> userList = userService.query(param);

        return userList.size() > 0 ? userList.get(0) : null;
    }

    @POST
    @Path("/users/getall")
    public List<User> getAllUsers()
    {
        List<User> userList = userService.query(new HashMap<String, Object>());
        return userList;
    }

}

测试服务

执行maven命令：clean tomcat:run

启动成功后，浏览器输入：http://localhost:8080/wsdemo/ws

结果：

输入：http://localhost:8080/wsdemo/ws/apis?_wadl

结果：

输入：http://localhost:8080/wsdemo/ws/apis/userwsservice/users/4

结果：

源码

 https://github.com/peterchenhdu/demos/tree/master/wsdemo

参考资料

https://examples.javacodegeeks.com/enterprise-java/rest/creating-jax-rs-web-service-using-apache-cxf/