cxf+spring+数字签名开发webservice（二）

• 场景

        上一章中的webservice接口，因为现场正式环境的项目与外部单位网络不通，是通过前置机与外部进行数据交换，所以我们将webservice部署在前置机，在使用HttpURLConnection与正式服务器上进行数       据传递。这里可以使用的技术挺多的，如：java的rmi,Hessian,spring的HttpInvoker等，下面是使用HttpURLConnection的代码（实际情况是最后选择了spring的HttpInvoker）:

•  HttpURLConnection客户端调用方法 

 1 package http.rpc.util;

 2 

 3 import java.io.BufferedOutputStream;

 4 import java.io.ByteArrayOutputStream;

 5 import java.io.IOException;

 6 import java.io.InputStream;

 7 import java.io.OutputStream;

 8 import java.io.OutputStreamWriter;

 9 import java.net.HttpURLConnection;

10 import java.net.MalformedURLException;

11 import java.net.URL;

12 import java.net.URLEncoder;

13 import java.util.Map;

14 

15 public class ClientUtils {

16   /*

17    * @param url    服务端url地址

18    * @param beanid 访问远程方法所在的类名

19    * @param method 调用服务端的方法名

20    * @param param  服务端的方法的参数

21    */

22     public static Object remoteService(String url, String beanid, String method, String param) {

23         HttpURLConnection urlcon = null;

24         String result = null;

25         try {

26             if (param == null) {

27                 param = "";

28             }

29             URL u = new URL(url + "/webservice.rpc");

30 

31             byte[] databuffer = new byte[1024];

32             ByteArrayOutputStream outStream = new ByteArrayOutputStream();

33             int len = 0;

34             try {

35                 urlcon = (HttpURLConnection) u.openConnection();

36                 urlcon.setDoOutput(true);

37                 urlcon.setRequestMethod("POST");

38                 OutputStream buf = new BufferedOutputStream(urlcon.getOutputStream());

39                 OutputStreamWriter out = new OutputStreamWriter(buf, "UTF-8");

40                 /* 向webservice.rpc传递3个参数 */

41                 out.write("serverid=" + beanid + "&method=" + method + param);

42                 out.flush();

43                 out.close();

44 

45                 urlcon.connect();

46                 if (urlcon.getResponseCode() == 200) {

47                     InputStream in = urlcon.getInputStream();

48                     while ((len = in.read(databuffer)) != -1) {

49                         outStream.write(databuffer, 0, len);

50                     }

51                     in.close();

52                     result = new String(outStream.toByteArray(), "utf-8");

53                     System.out.println(result);

54                     urlcon.disconnect();

55                 }

56             } catch (IOException e) {

57                 e.printStackTrace();

58             }

59         } catch (MalformedURLException e) {

60             e.printStackTrace();

61         }

62         urlcon.disconnect();

63         return result;

64     }

65 }

• 服务端web.xml配置(简单的servlet配置)

 

1 <servlet-mapping>

2    <servlet-name>testserver</servlet-name>

3    <url-pattern>/webservice.rpc</url-pattern>

4 </servlet-mapping>

5   

6 <servlet>

7    <servlet-name>testserver</servlet-name>

8 <servlet-class>http.rpc.Server</servlet-class>

 

• 服务端http请求类

 1 package http.rpc;

 2 

 3 import java.io.IOException;

 4 import javax.servlet.ServletException;

 5 import javax.servlet.ServletOutputStream;

 6 import javax.servlet.http.HttpServlet;

 7 import javax.servlet.http.HttpServletRequest;

 8 import javax.servlet.http.HttpServletResponse;

 9 

10 public class Server extends HttpServlet{

11 

12     @Override

13     protected void doPost(HttpServletRequest req, HttpServletResponse resp)

14             throws ServletException, IOException {

15         System.out.println("doPost");

16         String serverid = req.getParameter("serverid").toString();

17         String method = req.getParameter("method").toString();

18         String methodParam = req.getParameter("param").toString();

19         ServletOutputStream sos = resp.getOutputStream();

20         String result = "远程调用返回";

21         sos.write(result.getBytes("utf-8"));

22     }

23 }

• 最后说说

        Server类得到远程方法信息后，可以使用反射去调用具体方法。返回的数据如果是对象类型，可以实现序列化和反序列化进行数据传递。因为使用spring的HttpInvoker，就没写得很完善，这里只是做个记录，有时间再完善吧。