jersey + tomcat 实现restful风格

环境：

idea 15.0.2

jersey 1.3

tomcat 7.0

maven 3.3.3

1.idea 基于maven 构建webapp 略过

2.项目构建完成之后pom.xml 文件加入项目所需包：

<dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.7</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>com.sun.jersey</groupId>
            <artifactId>jersey-core</artifactId>
            <version>1.3</version>
        </dependency>
        <dependency>
            <groupId>com.sun.jersey</groupId>
            <artifactId>jersey-server</artifactId>
            <version>1.3</version>
        </dependency>
        <dependency>
            <groupId>com.sun.jersey</groupId>
            <artifactId>jersey-client</artifactId>
            <version>1.3</version>
        </dependency>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.14</version>
        </dependency>
        <dependency>
            <groupId>javax.ws.rs</groupId>
            <artifactId>jsr311-api</artifactId>
            <version>1.1.1</version>
        </dependency>
        <dependency>
            <groupId>asm</groupId>
            <artifactId>asm</artifactId>
            <version>3.2</version>
        </dependency>

3.创建pojo类 Student：

@XmlRootElement
public class Student {
    private int id;
    private String name;
    private String dept;

    public int getId() {
        return id;
    }

    public Student() {
    }

    public Student(int id, String name, String dept) {
        super();
        this.id = id;
        this.name = name;
        this.dept = dept;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getDept() {
        return dept;
    }
    public void setDept(String dept) {
        this.dept = dept;
    }

}

同时创建资源类：

@Path("/students")
public class RestWsDemo {
    private static Logger logger = Logger.getLogger(RestWsDemo.class);
    private static int index = 1;
    private static Map<Integer,Student> studentList = new HashMap<Integer, Student>();

    public RestWsDemo() {
        if(studentList.size()==0) {
            studentList.put(index, new Student(index++, "Frank",  "CS"));
            studentList.put(index, new Student(index++, "Jersey", "Math"));
        }
    }

    @GET
    @Path("{studentid}")
    @Produces({MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON})
    public Student getMetadata(@PathParam("studentid") int studentid) {
        if(studentList.containsKey(studentid))
            return studentList.get(studentid);
        else
            return new Student(0, "Nil", "Nil");
    }

    @GET
    @Path("list")
    @Produces({MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON})
    public List<Student> getAllStudents() {
        List<Student> students = new ArrayList<Student>();
        students.addAll(studentList.values());
        return students;
    }

    @POST
    @Path("add")
    @Produces("text/plain")
    public String addStudent(@FormParam("name") String name,
                             @FormParam("dept") String dept) {
        studentList.put(index, new Student(index++, name, dept));
        return String.valueOf(index-1);
    }

    @DELETE
    @Path("delete/{studentid}")
    @Produces("text/plain")
    public String removeStudent(@PathParam("studentid") int studentid) {
        logger.info("Receieving quest for deleting student: " + studentid);

        Student removed = studentList.remove(studentid);
        if(removed==null) return "failed!";
        else   return "true";
    }

    @PUT
    @Path("put")
    @Produces("text/plain")
    public String putStudent(@QueryParam("studentid") int studentid,
                             @QueryParam("name") String name,
                             @QueryParam("dept") String dept
    ) {
        logger.info("Receieving quest for putting student: " + studentid);
        if(!studentList.containsKey(studentid))
            return "failed!";
        else
            studentList.put(studentid, new Student(studentid, name, dept));

        return String.valueOf(studentid);
    }
}

创建完之后项目结构如图：

4.再web.xml 配置如下：

<servlet>
        <servlet-name>jerseyws</servlet-name>
        <servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>

        <init-param>
            <param-name>com.sun.jersey.config.property.resourceConfigClass</param-name>
            <param-value>com.sun.jersey.api.core.PackagesResourceConfig</param-value>
        </init-param>

        <init-param>
            <param-name>com.sun.jersey.config.property.packages</param-name>
            <param-value>cz.service</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>jerseyws</servlet-name>
        <url-pattern>/rest/*</url-pattern>
    </servlet-mapping>

其中 com.sun.jersey.config.property.packages 的属性值是你资源所在的包的路径

5.maven install 略过

6.启动tomcat 访问路径 http://localhost:8081/rest/students/list 就看以看到如下结果：

7.其他资源获取方式自行领悟、测试