【正文】 on對象，當客戶在所訪問的Web服務(wù)目錄的各個頁面之間瀏覽時，這個session對象都是同一個，而且不同客戶的session對象是互不相同的。 Out對象是一個輸出流，用來向客戶端輸出數(shù)據(jù)。(char),(char)：輸出一個布爾值。(float),(float)：輸出一個布爾值。(String),(String)：輸出一個布爾值。()：輸出緩沖區(qū)里的內(nèi)容。方法println 和print的區(qū)別是：println會向緩存區(qū)寫入一個換行，而print不寫入換行。附錄2 外文參考文獻（原文）JSP builtin objectsSome objects do not have a statement on the JSP page in the Java program and the expression of some of the use of film, which is builtin objects of the JSP.JSP has the builtin objects: request, response, session, application, out. response and request object is a builtin object in the JSP of the two more important, the two clients, the server and browser munication control. Directly to discuss the two objects before the first of the HTTP protocolWord Wide Wed underlying agreement to do a brief introduction.Word Wide Wed is how to run it? In a browser, type the correct URL, if all goes well, there have been web page. The use of browser access to HTML pages from the site, the actual use of Hypertext Transfer Protocol. HTTP provides information on the Internet transmission methods, in particular the provisions of your browser and server interaction method. Page from the website, the browser open on the site of a connection to the server on the network, and issued the request. Server in response to receipt of the request, so the core HTTP protocol is the request and response.A typical request usually contains a number of the first, known as the HTTP request header. Provided the first body of information and request additional information sources. Some of the first is a standard, and some of the specific browser. A request may also contain information, such as, information form body can contain HTML content. In HTML form, click Submit button, the form to use ACTION = POST or ACTION = GET method, enter the contents of the form have been sent to the server. The contents of this form by POST method or GET method in the request to send the message body.Server to send request, return HTTP response. Have some structure to respond to each by the state to respond to the start line, may include a number of head and body of information may be known as the HTTP response headers and body to respond to information, the head and body of information sent by the server to the client browser, body of information that customers request the results page for the JSP page is static information pages. Users may have been familiar with the status line, status line shows the agreement is being used, status code and text messaging. For example, if a server request error, then return an error status line and error description, for example, HTTP/ 404 Object Not Found. If the server successfully responded to the request for the page is returned that contains 200 OK status line.HTTP munication protocol between a client and a server to submit (Request) information and respond to information (request / response) munication protocol. In the JSP, the builtin object request package of information submitted by the user, then the object can call the appropriate method to obtain the information package, the use of the object can get users to submit information. Builtin object request is a type of interface SerletRequest an example of Tomcat server in the webapps \ tomcatdocs \ servletapi to find ways to interface SerletRequest.When a customer visits a page the server will be submitted to an HTTP request, the server receives a request, the HTTP response to return. Response and a similar request, but also a structure, by each state to respond to the start line, may include a number of head and body may be information. With the corresponding request object is the target response. Response object can be used on the client39。s browser in response to receiving the HTML parser will be used to explain the implementation of the information received.HTTP protocol is a stateless protocol. A client request to the server (), and then the server returns in response to (), connection has been closed. Not to retain the serverside connection information, so next time to connect, the server has no previous connection information to be able to judge this time to connect and the former belong to the same connection is a client. When a customer visits a Web services directory may be in the directory server to connect a few pages again and repeated constantly refresh a page or to submit information on one page, the server should be some way to know that this is with a client. Tomcat server can use the builtin session (session) objects connect the relevant information recorded. Builtin session object created by the Tomcat server, session the HttpSession interface to achieve a kind of example, the Tomcat server in the webapps \ tomcatdocs \ servletapi search method HttpSession interface.We already know that when a customer39。s content. (): close the stream.Println and print methods is the difference between: println to write a cache line, and the print is not written into the line. However, the browser display area is not currently written into the identification of the println line, if you want to show the line browser, it should be written to the browser wrap br achieve.37