java系统之间的接口通信1

最新推荐文章于 2023-03-23 08:28:32 发布

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#java #spring #servlet #class #null #service

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本文介绍了如何在Java中使用Spring和Hessian实现系统间的接口通信。通过在web.xml配置HessianServerServlet，编写Servlet来处理请求，并在Spring XML配置文件中定义服务和接口实现，以及展示CmiService接口及其Hessian实现类的代码。

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处理方式：

接口主方

（1）在web.xml中配置相应的servlet 用以处理所有的请求

   <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>

编写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("未找到相应的服务，请检查 Hessian URL 是否正确 (error url: " + requestPath + ")");
   }
  } else {
   response.setCharacterEncoding("utf-8");
   response.getWriter().println("请求的是根路径，请检查 Hessian URL 是否配置正确");
  }

}

@Override
public void init(ServletConfig config) throws ServletException {
  this.ac = SpringUtils.getWebApplicationContext(config.getServletContext());
  if (this.ac != null) {
   // 将Spring容器中定义的 HessianServiceExporter 均缓存到本实例变量中
   this.hessianExporterMappings.putAll(ac.getBeansOfType(HessianServiceExporter.class));
  } else {
   super.log("错误，Hessian 服务组件无法获取 Spring 上下文");
  }
}

@Override
public void destroy() {
  ac = null;
  hessianExporterMappings.clear();
  super.destroy();

}}