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空间信息发布关键技术及运筹学在WebGIS中的应用
中国科学院数学与系统研究院应用数学所，北京，100080
GIs作为有效的处理空间信息的工具在过去几十年中发挥了巨大的作用，
然而，伴随着Internet应用的逐步深入，传统的GIs体系己经暴露出它的许多
在新一代的GIs的开发和设计中，空间信息的Web发布技术是一个非常重
要的环节，它的设计直接影响到整个系统结构。结合实际开发WebGIS的经验，
本文详细探讨了有关的技术问题，给出了一种实现在工nternet上传递空间信息
的思路，并且已经初步实现。
吮本文对空间信息编辑器的设计和开发作了深入的研究，并构建了一个空间
信息的编辑发布系统
IAS,IntelligenceAgentSystem 。在这个新的发布体
系当中，它起着一个承上启下的作用。没有它，浏览器就无法看到任何地理信
息;没有它，海量的空间信息就无法实现社会化共享。通过该系统可以实现超
媒体空间信息对象的分布式操纵与编辑，浏览器端可以实现和GIs服务器端的
空间信息进行各种交互操作，从而实现空间信息发布的实时化、可视化和地理
空间信息的网络共享。
本文提出了一个适用于Web环境的空间数据结构模型
IAF，工ntelligence
AgentFile ，而通过IAS产生的数字地图由于采用统一的工AF进行空间数据处
理，使空间信息的处理标准化和规范化，从而在很大程度上提高了空间信息的
准确性、实时性和应用价值。
最后，本文探讨了如何将运筹学的方法和 WebGIS的结合问题，研究了通
Internet的应用模型服务器的方法，并在此基础上作了一些有益
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Complete&both of the following questions. Please limit
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帳號點進去之後一直出現錯誤
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(免TOEFL/GRE/GMAT/SAT)
詠瑞留學百貨公司/詠瑞留學專業顧問經紀公司/詠瑞留學英語中心/詠瑞留學國外學校代理中心/詠瑞留學出版公HttpServlet (Servlet API Documentation)
javax.servlet.http
Class HttpServlet
java.lang.Object
javax.servlet.http.HttpServlet
All Implemented Interfaces: java.io.Serializable, ,
public abstract class HttpServletextends implements java.io.Serializable
Provides an abstract class to be subclassed to create
an HTTP servlet suitable for a Web site. A subclass of
HttpServlet must override at least
one method, usually one of these:
doGet, if the servlet supports HTTP GET requests
doPost, for HTTP POST requests
doPut, for HTTP PUT requests
doDelete, for HTTP DELETE requests
init and destroy,
to manage resources that are held for the life of the servlet
getServletInfo, which the servlet uses to
provide information about itself
There's almost no reason to override the service
method. service handles standard HTTP
requests by dispatching them to the handler methods
for each HTTP request type (the doXXX
methods listed above).
Likewise, there's almost no reason to override the
doOptions and doTrace methods.
Servlets typically run on multithreaded servers,
so be aware that a servlet must handle concurrent
requests and be careful to synchronize access to shared resources.
Shared resources include in-memory data such as
instance or class variables and external objects
such as files, database connections, and network
connections.
information on handling multiple threads in a Java program.
&&&&&&&&&&Does nothing, because this is an abstract class.
protected &void
&&&&&&&&&&Called by the server (via the service method)
to allow a servlet to handle a DELETE request.
protected &void
&&&&&&&&&&Called by the server (via the service method) to
allow a servlet to handle a GET request.
protected &void
&&&&&&&&&&Receives an HTTP HEAD request from the protected
service method and handles the
protected &void
&&&&&&&&&&Called by the server (via the service method)
to allow a servlet to handle a OPTIONS request.
protected &void
&&&&&&&&&&Called by the server (via the service method)
to allow a servlet to handle a POST request.
protected &void
&&&&&&&&&&Called by the server (via the service method)
to allow a servlet to handle a PUT request.
protected &void
&&&&&&&&&&Called by the server (via the service method)
to allow a servlet to handle a TRACE request.
protected &long
&&&&&&&&&&Returns the time the HttpServletRequest
object was last modified,
in milliseconds since midnight January 1, 1970 GMT.
protected &void
&&&&&&&&&&Receives standard HTTP requests from the public
service method and dispatches
them to the doXXX methods defined in
this class.
&&&&&&&&&&Dispatches client requests to the protected
service method.
, , , , , , , , , ,
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
HttpServlet
public HttpServlet()
Does nothing, because this is an abstract class.
protected void doGet(&req,
java.io.IOException
Called by the server (via the service method) to
allow a servlet to handle a GET request.
Overriding this method to support a GET request also
automatically supports an HTTP HEAD request. A HEAD
request is a GET request that returns no body in the
response, only the request header fields.
When overriding this method, read the request data,
write the response headers, get the response's writer or
output stream object, and finally, write the response data.
It's best to include content type and encoding. When using
a PrintWriter object to return the response,
set the content type before accessing the
PrintWriter object.
The servlet container must write the headers before
committing the response, because in HTTP the headers must be sent
before the response body.
Where possible, set the Content-Length header (with the
to allow the servlet container to use a persistent connection
to return its response to the client, improving performance.
The content length is automatically set if the entire response fits
inside the response buffer.
When using HTTP 1.1 chunked encoding (which means that the response
has a Transfer-Encoding header), do not set the Content-Length header.
The GET method should be safe, that is, without
any side effects for which users are held responsible.
For example, most form queries have no side effects.
If a client request is intended to change stored data,
the request should use some other HTTP method.
The GET method should also be idempotent, meaning
that it can be safely repeated. Sometimes making a
method safe also makes it idempotent. For example,
repeating queries is both safe and idempotent, but
buying a product online or modifying data is neither
safe nor idempotent.
If the request is incorrectly formatted, doGet
returns an HTTP "Bad Request" message.
Parameters:req - an
object that
contains the request the client has made
of the servletresp - an
object that
contains the response the servlet sends
to the client
java.io.IOException - if an input or output error is
detected when the servlet handles
the GET request
- if the request for the GET
could not be handledSee Also:
getLastModified
protected long getLastModified(&req)
Returns the time the HttpServletRequest
object was last modified,
in milliseconds since midnight January 1, 1970 GMT.
If the time is unknown, this method returns a negative
number (the default).
Servlets that support HTTP GET requests and can quickly determine
their last modification time should override this method.
This makes browser and proxy caches work more effectively,
reducing the load on server and network resources.
Parameters:req - the HttpServletRequest
object that is sent to the servlet
Returns:a long integer specifying
the time the HttpServletRequest
object was last modified, in milliseconds
since midnight, January 1, 1970 GMT, or
-1 if the time is not known
protected void doHead(&req,
java.io.IOException
Receives an HTTP HEAD request from the protected
service method and handles the
The client sends a HEAD request when it wants
to see only the headers of a response, such as
Content-Type or Content-Length. The HTTP HEAD
method counts the output bytes in the response
to set the Content-Length header accurately.
If you override this method, you can avoid computing
the response body and just set the response headers
directly to improve performance. Make sure that the
doHead method you write is both safe
and idempotent (that is, protects itself from being
called multiple times for one HTTP HEAD request).
If the HTTP HEAD request is incorrectly formatted,
doHead returns an HTTP "Bad Request"
Parameters:req - the request object that is passed
to the servletresp - the response object that the servlet
uses to return the headers to the clien
java.io.IOException - if an input or output error occurs
- if the request for the HEAD
could not be handled
protected void doPost(&req,
java.io.IOException
Called by the server (via the service method)
to allow a servlet to handle a POST request.
The HTTP POST method allows the client to send
data of unlimited length to the Web server a single time
and is useful when posting information such as
credit card numbers.
When overriding this method, read the request data,
write the response headers, get the response's writer or output
stream object, and finally, write the response data. It's best
to include content type and encoding. When using a
PrintWriter object to return the response, set the
content type before accessing the PrintWriter object.
The servlet container must write the headers before committing the
response, because in HTTP the headers must be sent before the
response body.
Where possible, set the Content-Length header (with the
to allow the servlet container to use a persistent connection
to return its response to the client, improving performance.
The content length is automatically set if the entire response fits
inside the response buffer.
When using HTTP 1.1 chunked encoding (which means that the response
has a Transfer-Encoding header), do not set the Content-Length header.
This method does not need to be either safe or idempotent.
Operations requested through POST can have side effects for
which the user can be held accountable, for example,
updating stored data or buying items online.
If the HTTP POST request is incorrectly formatted,
doPost returns an HTTP "Bad Request" message.
Parameters:req - an
object that
contains the request the client has made
of the servletresp - an
object that
contains the response the servlet sends
to the client
java.io.IOException - if an input or output error is
detected when the servlet handles
the request
- if the request for the POST
could not be handledSee Also:,
protected void doPut(&req,
java.io.IOException
Called by the server (via the service method)
to allow a servlet to handle a PUT request.
The PUT operation allows a client to
place a file on the server and is similar to
sending a file by FTP.
When overriding this method, leave intact
any content headers sent with the request (including
Content-Length, Content-Type, Content-Transfer-Encoding,
Content-Encoding, Content-Base, Content-Language, Content-Location,
Content-MD5, and Content-Range). If your method cannot
handle a content header, it must issue an error message
(HTTP 501 - Not Implemented) and discard the request.
For more information on HTTP 1.1, see RFC 2616
This method does not need to be either safe or idempotent.
Operations that doPut performs can have side
effects for which the user can be held accountable. When using
this method, it may be useful to save a copy of the
affected URL in temporary storage.
If the HTTP PUT request is incorrectly formatted,
doPut returns an HTTP "Bad Request" message.
Parameters:req - the
object that
contains the request the client made of
the servletresp - the
object that
contains the response the servlet returns
to the client
java.io.IOException - if an input or output error occurs
while the servlet is handling the
PUT request
- if the request for the PUT
cannot be handled
protected void doDelete(&req,
java.io.IOException
Called by the server (via the service method)
to allow a servlet to handle a DELETE request.
The DELETE operation allows a client to remove a document
or Web page from the server.
This method does not need to be either safe
or idempotent. Operations requested through
DELETE can have side effects for which users
can be held accountable. When using
this method, it may be useful to save a copy of the
affected URL in temporary storage.
If the HTTP DELETE request is incorrectly formatted,
doDelete returns an HTTP "Bad Request"
Parameters:req - the
object that
contains the request the client made of
the servletresp - the
object that
contains the response the servlet returns
to the client
java.io.IOException - if an input or output error occurs
while the servlet is handling the
DELETE request
- if the request for the
DELETE cannot be handled
protected void doOptions(&req,
java.io.IOException
Called by the server (via the service method)
to allow a servlet to handle a OPTIONS request.
The OPTIONS request determines which HTTP methods
the server supports and
returns an appropriate header. For example, if a servlet
overrides doGet, this method returns the
following header:
Allow: GET, HEAD, TRACE, OPTIONS
There's no need to override this method unless the
servlet implements new HTTP methods, beyond those
implemented by HTTP 1.1.
Parameters:req - the
object that
contains the request the client made of
the servletresp - the
object that
contains the response the servlet returns
to the client
java.io.IOException - if an input or output error occurs
while the servlet is handling the
OPTIONS request
- if the request for the
OPTIONS cannot be handled
protected void doTrace(&req,
java.io.IOException
Called by the server (via the service method)
to allow a servlet to handle a TRACE request.
A TRACE returns the headers sent with the TRACE
request to the client, so that they can be used in
debugging. There's no need to override this method.
Parameters:req - the
object that
contains the request the client made of
the servletresp - the
object that
contains the response the servlet returns
to the client
java.io.IOException - if an input or output error occurs
while the servlet is handling the
TRACE request
- if the request for the
TRACE cannot be handled
protected void service(&req,
java.io.IOException
Receives standard HTTP requests from the public
service method and dispatches
them to the doXXX methods defined in
this class. This method is an HTTP-specific version of the
method. There's no
need to override this method.
Parameters:req - the
object that
contains the request the client made of
the servletresp - the
object that
contains the response the servlet returns
to the client
java.io.IOException - if an input or output error occurs
while the servlet is handling the
HTTP request
- if the HTTP request
cannot be handledSee Also:
public void service(&req,
java.io.IOException
Dispatches client requests to the protected
service method. There's no need to
override this method.
Specified by: in interface Specified by: in class
Parameters:req - the
object that
contains the request the client made of
the servletres - the
object that
contains the response the servlet returns
to the client
java.io.IOException - if an input or output error occurs
while the servlet is handling the
HTTP request
- if the HTTP request cannot
be handledSee Also:
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All Rights Reserved.