• Request、Servlet及其子接口


    最近看tomcat源码,这类接口多的有点眩,整理出来看一下。(基于tomcat4)

     javax.servlet.ServletRequset接口,和org.apache.catalina.Request接口,有什么联系?

    其实就是对Request不同层面上的定义。

    一、首先看下javax.servlet.Servlet接口

    package javax.servlet;
    import java.io.IOException;
    public abstract interface Servlet {
        public abstract void init(ServletConfig paramServletConfig)
                throws ServletException;
        public abstract ServletConfig getServletConfig();
        public abstract void service(ServletRequest paramServletRequest,
                ServletResponse paramServletResponse) throws ServletException,
                IOException;
        public abstract String getServletInfo();
        public abstract void destroy();
    }

    这些方法应该非常熟悉了。

    二、javax.servlet.http.HttpServlet抽象类

    package javax.servlet.http;
    
    public abstract class HttpServlet extends GenericServlet        implements Serializable {
        ...
    }

    丰富了servlet接口,对应http协议,添加了doGet, doPut, doPost等方法。

    三、javax.servlet.ServletRequest接口

    package javax.servlet;
    
    public abstract interface ServletRequest {
        public abstract Object getAttribute(String paramString);
    
        public abstract Enumeration getAttributeNames();
    
        public abstract String getCharacterEncoding();
    
        public abstract void setCharacterEncoding(String paramString)
                throws UnsupportedEncodingException;
    
        public abstract int getContentLength();
    
        public abstract String getContentType();
    
        public abstract ServletInputStream getInputStream() throws IOException;
    
        public abstract String getParameter(String paramString);
    
        public abstract Enumeration getParameterNames();
    
        public abstract String[] getParameterValues(String paramString);
    
        public abstract Map getParameterMap();
    
        public abstract String getProtocol();
    
        public abstract String getScheme();
    
        public abstract String getServerName();
    
        public abstract int getServerPort();
    
        public abstract BufferedReader getReader() throws IOException;
    
        public abstract String getRemoteAddr();
    
        public abstract String getRemoteHost();
    
        public abstract void setAttribute(String paramString, Object paramObject);
    
        public abstract void removeAttribute(String paramString);
    
        public abstract Locale getLocale();
    
        public abstract Enumeration getLocales();
    
        public abstract boolean isSecure();
    
        public abstract RequestDispatcher getRequestDispatcher(String paramString);
    
        /** @deprecated */
        public abstract String getRealPath(String paramString);
    }

    四、javax.servlet.http.HttpServletRequest

    public abstract interface HttpServletRequest extends ServletRequest {...}

    添加了http协议部分,比如session,cookie等。

    五、org.apache.catalina.Requst(tomcat4,后面的版本有变化)

    package org.apache.catalina;
    
    public interface Request {
    
        public String getAuthorization();
    
        public void setAuthorization(String authorization);
    
        public Connector getConnector();
    
        public void setConnector(Connector connector);
    
        public Context getContext();
    
        public void setContext(Context context);
    
        public String getInfo();
    
        public ServletRequest getRequest();
    
        public Response getResponse();
    
        public void setResponse(Response response);
    
        public Socket getSocket();
    
        public void setSocket(Socket socket);
    
        public InputStream getStream();
    
        public void setStream(InputStream stream);
    
        public Wrapper getWrapper();
    
        public void setWrapper(Wrapper wrapper);
    
        public ServletInputStream createInputStream() throws IOException;
    
        public void finishRequest() throws IOException;
    
        public Object getNote(String name);
    
        public Iterator getNoteNames();
    
        public void recycle();
    
        public void removeNote(String name);
    
        public void setContentLength(int length);
    
        public void setContentType(String type);
    
        public void setNote(String name, Object value);
    
        public void setProtocol(String protocol);
    
        public void setRemoteAddr(String remote);
    
        public void setScheme(String scheme);
    
        public void setSecure(boolean secure);
    
        public void setServerName(String name);
    
        public void setServerPort(int port);
    }

    六、org.apache.catalina.HttpRequest

    public interface HttpRequest extends Request {...}

    增加了对http协议头处理部分,比如url,参数,cookies等。

    七、org.apache.catalina.connector.HttpRequestBase

    虽然已经弃用了,但可以作为一个参考,实现了jdk和catalina定义的Request

    public class HttpRequestBase
        extends RequestBase
        implements HttpRequest, HttpServletRequest {...}

    小结

    tomcat中,对于jdk中的servlet和ServletRequest肯定要实现的。而tomcat作为容器应用,会有很多自身的需求,所以自己定义了一套接口,跟jdk中不同层面。并且提供两套接口的类,让web开发者使用。

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  • 原文地址:https://www.cnblogs.com/549294286/p/3704760.html
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