MAVEN,SPRING,CXF构建REST风格WebService

1.IDEA简历Maven模板webapp项目

2.Pom文件添加依赖项

<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.rminfo</groupId>
  <artifactId>test_RestWebservice</artifactId>
  <packaging>war</packaging>
  <version>1.0-SNAPSHOT</version>
  <name>test_RestWebservice Maven Webapp</name>
  <url>http://maven.apache.org</url>
  <properties>
    <spring.version>4.1.4.RELEASE</spring.version>
  </properties>
  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-core</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-webmvc</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <!-- web项目编译时需要，部署到tomcat中就不需要了 -->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>servlet-api</artifactId>
      <version>2.5</version>
      <scope>provided</scope>
    </dependency>
    <dependency>
      <groupId>javax.servlet.jsp</groupId>
      <artifactId>jsp-api</artifactId>
      <version>2.2</version>
      <scope>provided</scope>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
      <version>2.3.4</version>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-annotations</artifactId>
      <version>2.4.0</version>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-core</artifactId>
      <version>2.4.3</version>
    </dependency>
    <dependency>
      <groupId>javax.ws.rs</groupId>
      <artifactId>jsr311-api</artifactId>
      <version>1.1.1</version>
    </dependency>
    <dependency>
      <groupId>org.apache.cxf</groupId>
      <artifactId>cxf-rt-frontend-jaxrs</artifactId>
      <version>2.4.4</version>
    </dependency>
    <dependency>
      <groupId>org.codehaus.jackson</groupId>
      <artifactId>jackson-jaxrs</artifactId>
      <version>1.9.13</version>
    </dependency>

  </dependencies>
  <build>
    <finalName>test_RestWebservice</finalName>
  </build>
</project>

3. 修改web.xml文件

<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
  <display-name>Archetype Created Web Application</display-name>
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>/WEB-INF/transport-servlet.xml</param-value>
  </context-param>
  <servlet>
    <servlet-name>transport</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>transport</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>

  <servlet>
    <servlet-name>CXFServlet</servlet-name>
    <servlet-class>org.apache.cxf.transport.servlet.CXFServlet</servlet-class>
    <load-on-startup>2</load-on-startup>
  </servlet>

  <servlet-mapping>
    <servlet-name>CXFServlet</servlet-name>
    <url-pattern>/userService/*</url-pattern>
  </servlet-mapping>

  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
</web-app>

4. 添加Spring配置文件transport-servlet.xml

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

    <mvc:annotation-driven/>
    <context:component-scan base-package="com.rminfo.controller"/>

    <jaxrs:server id="userRestService" address="/userservices">
        <jaxrs:serviceBeans>
            <ref bean="userServiceImpl"/>
        </jaxrs:serviceBeans>
    </jaxrs:server>
    <bean id="userServiceImpl" class="com.rminfo.controller.UserServiceImpl"></bean>

</beans>

5. 建立实体类User，添加注解@XmlRootElement(name = "User")

否则会出错：No message body writer has been found for response class User.

package com.rminfo.controller;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;

/**
 * Created by carl on 2016/6/23.
 */
@XmlRootElement(name = "User")
public class User {
    private String userId;

    private String nickname;

    public String getUserId() {
        return userId;
    }

    public void setUserId(String userId) {
        this.userId = userId;
    }

    public String getNickname() {
        return nickname;
    }

    public void setNickname(String nickname) {
        this.nickname = nickname;
    }

    @Override
    public String toString() {

        return "User{" +
                "userId=‘" + userId + ‘\‘‘ +
                ", nickname=‘" + nickname + ‘\‘‘ +
                ‘}‘;
    }
}

6. WebService接口类添加注解，以及其实现

package com.rminfo.controller;

import javax.ws.rs.*;
import javax.ws.rs.core.MediaType;

/**
 * Created by carl on 2016/6/23.
 */
public interface UserService {

    @GET
    @Produces(MediaType.APPLICATION_JSON)
    @Path("/searchUser/{id}")
    public User searchUser(@PathParam("id") String userId);
}

7. 测试是否发布成功：http://localhost:8080/test_RestWebservice/userService

出现上述画面说明发布成功。