Java restful web service 开发入门

可用的框架有不少，我用的是jersey。

直接上代码，其实，如果你会web service 这个restful的就很好理解了，自己跑一遍就OK了

用到的类

User.java

 1 package demo.helloworld;
 2 
 3 import javax.xml.bind.annotation.XmlRootElement;
 4 
 5 /** 
 6  * @author edi_kai
 7  * @version 创建时间：2015-8-20 下午03:46:24 
 8  * 类说明 
 9  */
10 @XmlRootElement(name="User")
11 public class User {
12 
13     private String userName;
14     private String sex;
15     private int age;
16     
17     public User(String userName, String sex, int age) {
18         super();
19         this.userName = userName;
20         this.sex = sex;
21         this.age = age;
22     }
23     
24     public User() {
25         super();
26     }
27 
28     public String getUserName() {
29         return userName;
30     }
31     public void setUserName(String userName) {
32         this.userName = userName;
33     }
34     public String getSex() {
35         return sex;
36     }
37     public void setSex(String sex) {
38         this.sex = sex;
39     }
40     public int getAge() {
41         return age;
42     }
43     public void setAge(int age) {
44         this.age = age;
45     }
46 }

RestfulService.java

 1 package demo.helloworld;
 2 
 3 import javax.ws.rs.Consumes;
 4 import javax.ws.rs.GET;
 5 import javax.ws.rs.POST;
 6 import javax.ws.rs.Path;
 7 import javax.ws.rs.Produces;
 8 import javax.ws.rs.core.MediaType;
 9 
10 /**
11  * @包名 demo.RestfulService
12  * @文件名 RestfulService.java
13  * @作者 edi_kai
14  * @创建日期 2015年8月20日
15  * @版本 V 1.0
16  * @描述
17  */
18 @Path("/service")
19 public class RestfulService{
20 
21     final String XMLNS_NAMESPACE = "http://www.cnblogs.com/edi-kai/service";
22     final String ROOT_NODE = "root";
23 
24     @GET
25     @Produces("application/json")
26     @Path("/json")
27     public User getJsonMessage() {
28         User user = new User("admin", "BeiJing", 25);
29         return user;
30     }
31     
32     @GET
33     @Produces(MediaType.APPLICATION_XML)
34     @Path("/xml")
35     public User getXmlMessage() {
36         User user = new User("admin", "BeiJing", 25);
37         return user;
38     }
39     
40     @POST
41     @Produces(MediaType.APPLICATION_JSON)
42     @Consumes(MediaType.APPLICATION_JSON)
43     @Path("/getUser")
44     public User getMessageByJson(User user) {
45         System.out.println(user.getUserName());
46         return user;
47     }
48 
49 }

web.xml文件配置

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
 3     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4     xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
 5     http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
 6 
 7 
 8     <servlet>
 9         <servlet-name>rsServlet</servlet-name>
10         <servlet-class>
11             com.sun.jersey.spi.container.servlet.ServletContainer
12         </servlet-class>
13         
14         <!-- 不加这个，格式转换会有问题，比如JSON/XML -->
15         <init-param>
16             <param-name>javax.ws.rs.core.Application</param-name>
17             <param-value>javax.ws.rs.core.Application</param-value>
18         </init-param>
19 
20         <load-on-startup>1</load-on-startup>
21 
22     </servlet>
23 
24     <servlet-mapping>
25         <servlet-name>rsServlet</servlet-name>
26         <url-pattern>/rest/*</url-pattern>
27     </servlet-mapping>
28 
29 
30     <welcome-file-list>
31         <welcome-file>index.jsp</welcome-file>
32     </welcome-file-list>
33 
34 </web-app>

最后是调用的代码，我这里为了省事，直接在JSP里面用ajax调用的，代码如下：

 1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
 2 <%
 3 String path = request.getContextPath();
 4 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
 5 %>
 6 
 7 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 8 <html>
 9     <head>
10         <base href="<%=basePath%>">
11 
12         <title>My JSP 'index.jsp' starting page</title>
13         <meta http-equiv="pragma" content="no-cache">
14         <meta http-equiv="cache-control" content="no-cache">
15         <meta http-equiv="expires" content="0">
16         <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
17         <meta http-equiv="description" content="This is my page">
18         <script type="text/javascript"
19             src="<%=request.getContextPath()%>/js/jquery-1.9.1.js"></script>
20         <script type="text/javascript"
21             src="<%=request.getContextPath()%>/js/json2.js"></script>
22     </head>
23     <body>
24         This is my JSP page.
25         <br>
26     </body>
27 
28     <script type="text/javascript">
29 $(function(){
30 /*
31     alert(JSON.stringify(
32         {"productName":"Java编程思想（第4版）",
33         "isbn":"9787111213826",
34         "author":"[美]埃克尔",
35         "publishDate":1183270161125}
36     ));
37 */
38     var url = "rest/helloworld/getUser";
39     var url_1 = "http://10.169.217.198:5000/wa_cancel";
40     
41     var param = JSON.stringify(
42             {"userName":"Java编程思想（第4版）",
43             "sex":"男",
44             "age":25}
45         );
46     var param_1 = JSON.stringify(
47             {'WithdrawID': 'APP2015062610000003', 
48             'TranTime': '1438589070', 
49             'Uid': '100163', 
50             'Sign': '599ba17c1b882d0eb57c22572c12e006'}
51         );
52     $.ajax({
53         type : "POST",
54         url : url_1,
55         dataType : "json",
56         contentType : "application/json",
57         data : param_1,
58         success : function(data){
59              alert("以下是从服务器返回的User对象:

" + JSON.stringify(data));
60         },
61         error : function(jqXHR, textStatus, errorThrown){
62             console.info('error: ' + textStatus+','+jqXHR+','+errorThrown);
63         }
64     });
65 });
66 </script>
67 </html>

　　可能会用到的jar包，我添加了这些，但可能有些是用不到的，注意要讲其中的asm-3.3.1.jar、jersey-bundle-1.9.1.jar、jettison-1.1.jar、jsr311-api-1.1.1.jar这四个jar包放到tomcat的lib目录下才可以

最后附上jar包的下载地址jar.zip