bap.pp.filter.wrapper.response

Class SystemResponseWrapper

java.lang.Object

javax.servlet.ServletResponseWrapper

javax.servlet.http.HttpServletResponseWrapper

bap.pp.filter.wrapper.response.SystemResponseWrapper

All Implemented Interfaces:

javax.servlet.http.HttpServletResponse, javax.servlet.ServletResponse

public class SystemResponseWrapper
extends javax.servlet.http.HttpServletResponseWrapper

类: SystemResponseWrapper 功能描述: response装饰器 用于获取要发送到浏览器的页面 大致思路为：在response在发送页面前用本修饰器，自定义的PrintWriter，ServletoutPutStream替换掉 servlet的PrintWriter，ServletOutPutStream。然后servlet在使用PrintWriter，ServletO- utPutStream时将要发送的页面放在了自定义的PrintWriter，ServletOutPutStream中。 在response过滤器修改本方法获取的页面后，用response自己的PrintWriter，HttpServletoutputStr- eam将修改后的页面发送到浏览器。 这里重载getWriter和getOutputStream是为了兼容tomcat和weblogic，这两种服务器的servlet有区别， 区别为：tomcat调用getWriter，但是weblogic调用getOutputStream。以后再遇见其他的服务器也就这两种 调用的方法了，可以做到服务器的兼容。 而且这样做PrintWriter和ServletOutPutStream都是自定义的PrintWriter和ServletOutPutStream 避免Servlet自身的PrintWriter与ServletOutPutStream同时调用的问题。 最后说明：本实现方法是参考了常规的response过滤器和oscache的页面缓存，对服务器内部的servlet运行也不是 很清楚。以上都是自己的推测，欢迎指正。 创建人: 陈伟 创建日期: 2013-11-20 上午09:27:45 开发环境: JDK6.0

Field Summary

Fields inherited from interface javax.servlet.http.HttpServletResponse

SC_ACCEPTED, SC_BAD_GATEWAY, SC_BAD_REQUEST, SC_CONFLICT, SC_CONTINUE, SC_CREATED, SC_EXPECTATION_FAILED, SC_FORBIDDEN, SC_FOUND, SC_GATEWAY_TIMEOUT, SC_GONE, SC_HTTP_VERSION_NOT_SUPPORTED, SC_INTERNAL_SERVER_ERROR, SC_LENGTH_REQUIRED, SC_METHOD_NOT_ALLOWED, SC_MOVED_PERMANENTLY, SC_MOVED_TEMPORARILY, SC_MULTIPLE_CHOICES, SC_NO_CONTENT, SC_NON_AUTHORITATIVE_INFORMATION, SC_NOT_ACCEPTABLE, SC_NOT_FOUND, SC_NOT_IMPLEMENTED, SC_NOT_MODIFIED, SC_OK, SC_PARTIAL_CONTENT, SC_PAYMENT_REQUIRED, SC_PRECONDITION_FAILED, SC_PROXY_AUTHENTICATION_REQUIRED, SC_REQUEST_ENTITY_TOO_LARGE, SC_REQUEST_TIMEOUT, SC_REQUEST_URI_TOO_LONG, SC_REQUESTED_RANGE_NOT_SATISFIABLE, SC_RESET_CONTENT, SC_SEE_OTHER, SC_SERVICE_UNAVAILABLE, SC_SWITCHING_PROTOCOLS, SC_TEMPORARY_REDIRECT, SC_UNAUTHORIZED, SC_UNSUPPORTED_MEDIA_TYPE, SC_USE_PROXY

Constructor Summary

Constructors

Constructor and Description
SystemResponseWrapper(javax.servlet.http.HttpServletResponse response)

Method Summary

Modifier and Type	Method and Description
void	close()
void	finalize()
java.lang.String	getContent(java.lang.String serverInfo) 获得要发送到浏览器的页面
javax.servlet.ServletOutputStream	getOutputStream()
java.io.PrintWriter	getWriter()

Methods inherited from class javax.servlet.http.HttpServletResponseWrapper

addCookie, addDateHeader, addHeader, addIntHeader, containsHeader, encodeRedirectUrl, encodeRedirectURL, encodeUrl, encodeURL, getHeader, getHeaderNames, getHeaders, getStatus, sendError, sendError, sendRedirect, setDateHeader, setHeader, setIntHeader, setStatus, setStatus

Methods inherited from class javax.servlet.ServletResponseWrapper

flushBuffer, getBufferSize, getCharacterEncoding, getContentType, getLocale, getResponse, isCommitted, isWrapperFor, isWrapperFor, reset, resetBuffer, setBufferSize, setCharacterEncoding, setContentLength, setContentLengthLong, setContentType, setLocale, setResponse

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface javax.servlet.ServletResponse

flushBuffer, getBufferSize, getCharacterEncoding, getContentType, getLocale, isCommitted, reset, resetBuffer, setBufferSize, setCharacterEncoding, setContentLength, setContentLengthLong, setContentType, setLocale

Constructor Detail

SystemResponseWrapper

public SystemResponseWrapper(javax.servlet.http.HttpServletResponse response)

Method Detail

finalize

public void finalize()
              throws java.lang.Throwable

Overrides:

finalize in class java.lang.Object

Throws:

java.lang.Throwable

getContent

public java.lang.String getContent(java.lang.String serverInfo)

获得要发送到浏览器的页面

Parameters:

serverInfo - 服务器类型

Returns:

getWriter

public java.io.PrintWriter getWriter()
                              throws java.io.IOException

Specified by:

getWriter in interface javax.servlet.ServletResponse

Overrides:

getWriter in class javax.servlet.ServletResponseWrapper

Throws:

java.io.IOException

getOutputStream

public javax.servlet.ServletOutputStream getOutputStream()
                                                  throws java.io.IOException

Specified by:

getOutputStream in interface javax.servlet.ServletResponse

Overrides:

getOutputStream in class javax.servlet.ServletResponseWrapper

Throws:

java.io.IOException

close

public void close()
           throws java.io.IOException

Throws:

java.io.IOException