概要:考虑到上一篇中的request和response对象的安全性,不允许servlt程序员在service方法中把servletRequest和servletResponse对象进行强转request和response对象,而访问到request和response对象中私有的方法,这里引入外观类:RequestFacade和ResponseFacade,只实现ServletResponse和ServletRequest中声明的方法
1、具体代码如下:
public
class RequestFacade implements ServletRequest {
private ServletRequest request = null;
public RequestFacade(Request request) {
this.request = request;
}
。。。。。。
}
public class ResponseFacade implements ServletResponse {
private ServletResponse response;
public ResponseFacade(Response response) {
this.response = response;
}
。。。。。
}
将request和response对象作为私有变量在
构造器是进行传入,用此方法进行保护。
2、分析器相应的代码修改如下:
Servlet servlet = null;
RequestFacade requestFacade = new RequestFacade(request);
ResponseFacade responseFacade = new ResponseFacade(response);
try {
servlet = (Servlet) myClass.newInstance();
servlet.service((ServletRequest) requestFacade, (ServletResponse) responseFacade);
}
catch (Exception e) {
System.out.println(e.toString());
}