java系統之間的介面通訊1

 

處理方式：

 介面主方

  （1）在web.xml中配置相應的servlet 用以處理所有的請求

   <servlet>
     <servlet-name>hessianServerServlet</servlet-name>
     <servlet-class>com.psychcn.cmi3.web.servlet.HessianServerServlet</servlet-class>
  
   </servlet>
  
   <servlet-mapping>
     <servlet-name>hessianServerServlet</servlet-name>
     <url-pattern>/hessian/*</url-pattern>
   </servlet-mapping>

 

編寫servlet

import java.io.IOException;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.context.ApplicationContext;
import org.springframework.remoting.caucho.HessianServiceExporter;
import org.springframework.web.util.UrlPathHelper;

import com.psychcn.util.SpringUtils;

public class HessianServerServlet extends HttpServlet {

 private static final long serialVersionUID = -7579598882061647014L;
 
 ConcurrentMap<String, HessianServiceExporter> hessianExporterMappings =
  new ConcurrentHashMap<String, HessianServiceExporter>();
 
 UrlPathHelper urlPathHelper = new UrlPathHelper();
 
 private ApplicationContext ac = null;
 
 @Override
 protected void service(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
  
  String requestPath = urlPathHelper.getPathWithinServletMapping(request);
  if (requestPath!= null && requestPath.length() > 1) {
   HessianServiceExporter exporter = hessianExporterMappings.get(requestPath);
   if (exporter != null) {
    exporter.handleRequest(request, response);
   } else {
    response.setCharacterEncoding("utf-8");
    response.getWriter().println("未找到相應的服務，請檢查 Hessian URL 是否正確 (error url: " + requestPath + ")");
   }
  } else {
   response.setCharacterEncoding("utf-8");
   response.getWriter().println("請求的是根路徑，請檢查 Hessian URL 是否配置正確");
  }
  
 }
 
 @Override
 public void init(ServletConfig config) throws ServletException {
  this.ac = SpringUtils.getWebApplicationContext(config.getServletContext());
  if (this.ac != null) {
   // 將Spring容器中定義的 HessianServiceExporter 均緩衝到本執行個體變數中
   this.hessianExporterMappings.putAll(ac.getBeansOfType(HessianServiceExporter.class));
  } else  {
   super.log("錯誤，Hessian 服務元件無法擷取 Spring 上下文");
  }
 }
 
 @Override
 public void destroy() {
  ac = null;
  hessianExporterMappings.clear();
  super.destroy();
  
 }}

spring xml中的配置

 <bean id="cmiService" class="com.psychcn.cmi3.remoting.hessian.CmiServiceHessianImpl" >
  <constructor-arg index="0" ref="mainDataSource" />
 </bean>
 
 <bean name="/cmiService" class="org.springframework.remoting.caucho.HessianServiceExporter">
  <property name="service" ref="cmiService" />
  <property name="serviceInterface" value="com.psychcn.cmi3.remoting.CmiService" />
 </bean>

 

 

編寫相應的介面即實作類別：

public interface CmiService {}

public class CmiServiceHessianImpl extends ServiceImpl  implements CmiService, InitializingBean, ApplicationContextAware {}