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  • Analysis servlet

     

    @WebServlet("/cdiservlet")     
    public class NewServlet extends HttpServlet {
        private Message message;
    
        @Override             ||将doget重写
        public void init() {
            message = new MessageB();    ||初始化
        }
    
        @Override
        public void doGet(HttpServletRequest request, HttpServletResponse response)
                      throws IOException {             
            response.getWriter().write(message.get());   ||捕获可能发生的异常
        }
    }

     

    public interface Message {         ||servlet实现Message接口的一个对象实例
        public String get();
    }

     

    public class MessageB implements Message {          ||servlet创建以下对象的实例
        public MessageB() { }
    
        @Override
        public String get() {
            return "message B";
        }
    }

     

    @WebServlet("/cdiservlet")              ||使用CDI,servlet声明它对Message实例的依赖性,并让它由CDI运行时自动注入
    public class NewServlet extends HttpServlet {
        @Inject private Message message;
    
        @Override
        public void doGet(HttpServletRequest request, HttpServletResponse response)
                      throws IOException {       

     

              response.getWriter().write(message.get());  ||捕获可能发生的异常
    }
    }

     

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  • 原文地址:https://www.cnblogs.com/zyhello/p/10609188.html
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