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 

 package http.rpc.util;

 import java.io.BufferedOutputStream;
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
 import java.io.OutputStreamWriter;
 import java.net.HttpURLConnection;
 import java.net.MalformedURLException;
 import java.net.URL;
 import java.net.URLEncoder;
 import java.util.Map;

 public class ClientUtils {
   /*
    * @param url    服务端url地址
    * @param beanid 访问远程方法所在的类名
    * @param method 调用服务端的方法名
    * @param param  服务端的方法的参数
    */
     public static Object remoteService(String url, String beanid, String method, String param) {
         HttpURLConnection urlcon = null;
         String result = null;
         try {
             if (param == null) {
                 param = "";
             }
             URL u = new URL(url + "/webservice.rpc");

             byte[] databuffer = new byte[1024];
             ByteArrayOutputStream outStream = new ByteArrayOutputStream();
             int len = 0;
             try {
                 urlcon = (HttpURLConnection) u.openConnection();
                 urlcon.setDoOutput(true);
                 urlcon.setRequestMethod("POST");
                 OutputStream buf = new BufferedOutputStream(urlcon.getOutputStream());
                 OutputStreamWriter out = new OutputStreamWriter(buf, "UTF-8");
                 /* 向webservice.rpc传递3个参数 */
                 out.write("serverid=" + beanid + "&method=" + method + param);
                 out.flush();
                 out.close();

                 urlcon.connect();
                 if (urlcon.getResponseCode() == 200) {
                     InputStream in = urlcon.getInputStream();
                     while ((len = in.read(databuffer)) != -1) {
                         outStream.write(databuffer, 0, len);
                     }
                     in.close();
                     result = new String(outStream.toByteArray(), "utf-8");
                     System.out.println(result);
                     urlcon.disconnect();
                 }
             } catch (IOException e) {
                 e.printStackTrace();
             }
         } catch (MalformedURLException e) {
             e.printStackTrace();
         }
         urlcon.disconnect();
         return result;
     }
 }

• 服务端web.xml配置(简单的servlet配置)

 <servlet-mapping>
    <servlet-name>testserver</servlet-name>
    <url-pattern>/webservice.rpc</url-pattern>
 </servlet-mapping>

 <servlet>
    <servlet-name>testserver</servlet-name>
 <servlet-class>http.rpc.Server</servlet-class>

• 服务端http请求类

 package http.rpc;

 import java.io.IOException;
 import javax.servlet.ServletException;
 import javax.servlet.ServletOutputStream;
 import javax.servlet.http.HttpServlet;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;

 public class Server extends HttpServlet{

     @Override
     protected void doPost(HttpServletRequest req, HttpServletResponse resp)
             throws ServletException, IOException {
         System.out.println("doPost");
         String serverid = req.getParameter("serverid").toString();
         String method = req.getParameter("method").toString();
         String methodParam = req.getParameter("param").toString();
         ServletOutputStream sos = resp.getOutputStream();
         String result = "远程调用返回";
         sos.write(result.getBytes("utf-8"));
     }
 }

• 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。