servlet. The include directive should be placed in the document where you want to insert the file. The third instruction, taglib, defines a custom tag label.
Second, JSP page instruction
The page directive can define the following case sensitive attributes (listed roughly according to the frequency of use): Import, ContentType, pageencoding, Session, Iselignored (JSP 2.0 only), buffer, AutoFlush, info, errorpage, iserrorpage, IsThreadSafe, language
error occurs when checkerror () is called.
Start with the following versions:
Jdk1.1
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Field Abstract
Protected writer out
The bottom layer character output stream of this printwriter.
Fields inherited from Java. Io. Writer
Lock
Constructor Summary
Printwriter (File file)
Use the specified file to create a new printwriter that does not have automatic row refresh.
Printwriter (File file, string CSN)
Creates a new prin
The following three classes of System. Diagnostics can help us diagnose applications:
Debug
Trace
EventLog
When creating a VS project, VS defines the Trace and Debug symbols for us. The difference between them is that the Trace is also valid in the release version, while the Debug is only valid in the Debug version. EventLog can be recorded in Windows system logs.
Trace and Debug use the same functions, but Trace is more powerful. By default, their output is the Console of the debugger.
Exa
page Instruction (page directive)Properties of page directive:
(1) Language: Specifies the scripting language used in JSP pages;
(2) ContentType: Specifies the MIME type and character encoding used when server-side sends data to the browser end, the default value is "text/html;" Charset=iso-8859-1 ";
(3) Pageencoding: Specifies the character encoding of the JSP page itself;
(4) Import: importing Java classes;
(5) Session: Specifies whether the session object can be used, and the default value is
file into the JSP page when the JSP file is converted to the servlet. The include command should be placed in the place where the file is to be inserted in the document. The third instruction, taglib, defines the custom tag.
Ii. JSP page commands
The page command can define the following case-sensitive attributes (roughly listed based on the frequency of use): import, contentType, pageEncoding, session, isELIgnored (JSP 2.0 only), buffer, autoFlush,
page command selects autoflush = "true", when the buffer overflow occurs because the current operation does not clear the cache, all I/O operations of this class will automatically clear the buffer content. if autoflush = "false", when the operation causes a buffer overflow, All I/O operations of this class will throw an ioexception.
3.6.1 variables of the out object
A
1 hbase. hregion. Max. filesize
2 autoflush = false
3. Concerning the settings of family and qualifier in table from the perspective of performance
4 hbase. regionserver. handler. Count
1 hbase. hregion. Max. filesizeDefault Value: 256 mDescription: Maximum hstorefile size. If any one of a column families 'hstorefiles has grown to exceed this value, the hosting hregion is split in two.
The maximum value of hstorefile. If the size of any column family
Page is the property used to define the entire pagePage properties: ContentType, import, language, session, buffer, AutoFlush, IsThreadSafe, pageencodingFormat: One property specifies multiple attribute values when the property value is quoted, and the attribute values are separated by commas (punctuation English)Space between multiple properties of the pageLangusge property: Only the Java language can be specified at this time.Format: The property va
1.page instructionThe page directive is used primarily to set the global properties of a JSP page, which will act on the entire JSP page, even the statically contained pages. The syntax format is as follows:(1) Import attributeThe Import property is used to formulate the imported package. The syntax format is as follows:(2) Session propertiesThe session property is used to specify whether the page can use the Session object. If set to True, the session can be used. If False, the session cannot b
will also give an example to illustrate how to use out Built-in objects. Create an out. jsp file with the following code:
BufferSize: BufferRemain: AutoFlush:
Program Description: The buffer attribute in the page command is used to set the buffer size. If the autoFlush attribute is true, the buffer is automatically cleared. Run the JSP page in the browser and you will find that the program can only outpu
: $! ";
Listen (SOCK, SOMAXCONN) or die "listen () failed: $! ";
Warn "Starting server on port $ port... \ n ";
While (1 ){
Next unless my $ remote_addr = accept (SESSION, SOCK );
Defined (my $ pid = fork) or die "Can't fork: $! \ N ";
If ($ pid = 0 ){My ($ port, $ hisaddr) = sockaddr_in ($ remote_addr );Warn "Connection from [", inet_ntoa ($ hisaddr), ", $ port] \ n ";SESSION-> autoflush (1 );Print SESSION (my $ s = localtime );Warn "Connection from
' t set so_reusaddr: $!";
My $my _addr = sockaddr_in ($port, Inaddr_any);
Bind (sock, $my _addr) or Die "bind () failed: $!";
Listen (Sock,somaxconn) or Die "Listen () failed: $!";
Warn "Starting server on port $port ... \ n";
while (1) {
Next unless my $remote _addr = accept (Session,sock);
Defined (my $pid =fork) or die "Can ' t fork: $!\n";
if ($pid ==0) {
My ($port, $hisaddr) = sockaddr_in ($remote _addr);
Warn "Connection from [", Inet_ntoa ($HISADDR), ", $port]\n";
Session->
model for the output stream.
2
autoFlush
Controls the behavior of the servlet output buffers.
3
contentType
Defines the character encoding scheme.
4
errorPage
Defines another URL that reports the JSP that Java does not check for runtime exceptions.
5
isErrorPage
Indicates whether this JSP page is a URL specified by the properties of another JSP page errorP
throughput will be affected and decreased.Based on the above two cases, hbase. hregion. max. filesize should not be too large or too small. Mb may be a more ideal empirical parameter. For offline applications, adjusting to 256 MB is more appropriate. For online applications, the split mechanism should not be less than MB unless modified.2 autoflush = falseBoth the official website and many blogs advocate setting
tracking, set it to false. When set to false, the session object is inaccessible.
IsELlgnored attributes:Defines whether to execute or ignore EL expressions on the jsp page. True indicates ignore, and false indicates execution.The default value depends on the web. xml version. The default value is true before servlet2.3 and false by servlet2.4.This error occurs when EL expressions are used due to inconsistent JSP versions. Use: isELlgnored = "true ";
Buffer and
;=yii_trace_level) break; } nbsP } } //calls the Clogger class's log method self::$_logger->log ($msg, $level, $category);}The Clogger class's Log method implementation is as follows: /** * Logs a message. * Messages logged by this method is retrieved back via {@link getlogs}. * @param string $message message to being logged * @param string $level level of the message (e.g. ' Trace ', ' Warning ', ' Error ‘). It is case-insensitive. * @param string $category category of the
Streamwriter class
07:11:02 Source: Network-collected articles Author: Unknown click rate:Core Tip: streamwriter is a class used to process text files. It can easily write strings to text files. It is also responsible for important conversion and processing of writing data to filestream objects.
Streamwriter is a class used to process text files. It can easily write strings to text files. It is also responsible for important conversion and processing of writing data to filestream objects.
Common
Related information:"21-Day Learning Java Web Development"Summary of results:1.page Set JSP page Global properties, acting on the entire JSP page, including statically contained files2.the 3.page directive contains 13 attributes as shown in the table:1>language used to declare the type of script spoken2>extends is used to specify which parent class the servlet generated by the JSP page inherits from3>import used to specify the imported Java package4>session is used to specify whether the session
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