.


:

:



,



( , )

:

































 

 

 

 
FAQ

Org.apache.catalina.core.ApplicationContext log

⇐ 38394041424344454647 ⇒



INFO: Request for /FirstProject/SessionServlet; Count=1

Request

web.xml :

<listener>

<listener-name>MyRequestListener</listener-name>

<listener-class>chapt21.MyRequestListener</listener-class>

</listener>

Filter , . , . , , ( ) , . ,
, JSP-.

, :

, ;

request-response;

;

;

;

.

Filter, FilterChain FilterConfig javax.servlet. Filter.

void doFilter(ServletRequest req, ServletResponse res, FilterChain chain),

, . , / FilterChain. , .

, void init(FilterConfig config), FilterConfig. destroy() , .

init(), doFilter() , . destroy().

doFilter() , FilterChain, . FilterChain , /. chain.doFilter() .

request JSP- demofilter.jsp testName.

<!-- # 7: : demofilter.jsp -->

<%@ page language="java" contentType="text/html;

charset=ISO-8859-5" pageEncoding="ISO-8859-5"%>

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>

<html><head><title>Demo Filter</title></head>

<body>

<c:out value="Info from filter: ${info}"/> <br>

<P> </P>

</body></html>

, info .

Filter :

/* # 8: : MyFilter.java */

package chapt21;

import javax.servlet.Filter;

import javax.servlet.FilterChain;

import javax.servlet.FilterConfig;

import javax.servlet.ServletRequest;

import javax.servlet.ServletResponse;

 

public class MyFilter implements Filter {

private FilterConfig filterConfig;

 

public void init(final FilterConfig filterConfig) {

this. filterConfig = filterConfig;

}

public void doFilter(final ServletRequest request,

final ServletResponse response, FilterChain chain)

throws java.io.IOException,

javax.servlet.ServletException {

System. out. println(" ");

String value = "Simple Filter";

 

request.setAttribute("info", value);

 

chain.doFilter(request, response);

System. out. println("info = " + value);

System. out. println(" a");

}

public void destroy() {

System. out. println(" a");

}

}

, <web-app> web.xml :

<filter>

<filter-name>simplefilter</filter-name>

<filter-class>chapt21.MyFilter</filter-class>

</filter>

<filter-mapping>

<filter-name>simplefilter</filter-name>

<url-pattern>/demofilter.jsp</url-pattern>

</filter-mapping>

. . PrintWriter, . , UTF-8.

// # 9: , : SetCharFilter.java

package chapt21;

import java.io.IOException;

import javax.servlet.*;

 

public class SetCharFilter implements Filter {

private FilterConfig filterConfig = null;

 

public void init(FilterConfig config)

throws ServletException {

this. filterConfig = config;

 

}

public void doFilter(ServletRequest request,

ServletResponse response, FilterChain next)

throws IOException, ServletException {

//

String encoding = request.getCharacterEncoding();

System. out. println(encoding);

// UTF-8,

if (!"UTF-8".equalsIgnorCase(encoding))

response.setCharacterEncoding("UTF-8");

next.doFilter(request, response);

}

public void destroy() {

}

}

web.xml:

<filter>

<filter-name>setCharFilter</filter-name>

<filter-class>chapt21. SetCharFilter</filter-class>

</filter>

<filter-mapping>

<filter-name>setCharFilter</filter-name>

<url-pattern>/DemoCharServlet</url-pattern>

</filter-mapping>

, DemoCharServlet .

/* # 10: :
DemoCharServlet.java*/

package chapt21;

import java.io.*;

import java.util.*;

import javax.servlet.*;

import javax.servlet.http.*;

public class DemoCharServlet extends HttpServlet {

public void init() throws ServletException {

}

public void doGet(HttpServletRequest request,

HttpServletResponse response)

throws ServletException, IOException {

response.setContentType("text/html");

PrintWriter out = response.getWriter();

out.print(" !");

}

public void destroy() {

super. destroy();

}

}

:

!

21

. , .

1. , , , . cookie.

2. . , HTML-, cookie, .

3. , , . ? cookie.

4. cookie , .

5. . cookie, .

6. . cookie, . :

) ;

) .

7. , , , , . cookie , . : .

8. cookie , , .

9. - . cookie.

10. . , , cookie.

11. cookie.

12. .
cookie.

13. HTML-.
cookie ( ), .

14. HTML-. cookie. , . : <BR>.

15. HTML- . , HTML , cookie. , . : <BR>.

16. . cookie.

17. cookie.

18. (*.by, *.ru ..), , cookie.

19. ()
cookie.

20. , .

B

4 . cookie
.

21

21.1.

?

1) , ;

2) invalidate() ;

3) remove() ;

4) delete() ;

5) finalize() .

21.2.

?

1) setAttribute(String name, Object value);

2) removeAttribute();

3) deleteAttribute();

4) setValue(String name, Object value);

5) getAttributeNames();

6) getInactiveTime().

21.3.

- - HttpServletRequest req?

1) HttpSession session = req.getSession();

2) HttpSession session = req.createHttpSession();

3) Session session = req.createSession();

4) Session session = req.getSession();

5) HttpSession session = req.getHttpSession();

6) HttpSession session = req.createSession();

7) HttpSession session = req.getSession(true).

21.4.

Cookie ?

1) Cookie ;

2) Cookie.setName(String name);

3) setValue(String value);

4) cookie 4096 ;

5) cookie;

6) cookie Cookie.setMaxAge(int day).

21.5.

Cookie ?

1) Cookie c1 = new Cookie ();

2) Cookie c2 = new Cookie ("cookie2");

3) Cookie c3 = new Cookie ("$cookie3", "value3");

4) Cookie c4 = new Cookie ("cookie 4", "value4");

5) Cookie c5 = new Cookie ("cookie5", "value5");

6) Cookie c6 = new Cookie ("6cookie", "value6");

7) Cookie c7 = new Cookie ("c7,8", "value7").

21.6.

cookie - HttpServletResponse resp?

1) resp.setCookie(Cookie cookie);

2) resp.addCookie(Cookie cookie);

3) resp.createCookie(Cookie cookie);

4) resp.putCookie(Cookie cookie);

5) resp.setCookies(Cookie cookie).

 
22

JSP 1.1 . Web-, , Java. , . Java- JSP Java-,
. JSP- .

, , ( .tld), , XML- .

Java, javax.servlet.jsp.tagext.Tag. , TagSupport BodyTagSupport ( ). Tag , . javax.servlet.jsp , , java.io .

doStartTag(), , , .

, .

/ # 1: : GetInfoTag.java */

package test.mytag;

import javax.servlet.jsp.tagext.TagSupport;

import javax.servlet.jsp.JspException;

import javax.servlet.jsp.JspWriter;

import java.io.IOException;

// - (. #7 )

import test.my.MySet;

 

public class GetInfoTag extends TagSupport {

public int doStartTag() throws JspException {

// ,

int size = new Integer(new MySet().getSize());

String str = "Size =<B>(" + size + ")</B>";

try {

JspWriter out = pageContext.getOut();

out.write(str);

} catch (IOException e) {

throw new JspException(e.getMessage());

}

return SKIP_BODY;

}

}

, doStartTag() SKIP_BODY, .

, write() JspWriter, str. pageContext PageContext , TagSupport, , JSP. getOut() JspWriter, . PageContext :

getRequest() ;

getResponse() ;

getServletContext() ;

getServletConfig() ;

getSession() ;

ErrorData getErrorData() .

:

forward(String relativeUrlPath) action-;

include() ServletRequest ServletResponse, .

XML-. XML .

.tld <taglib>, <tag>.
, JSP, , .
, : test.mytag.GetInfoTag. XML- XSD, <taglib>.

, <taglib>, :

tlib-version ;

short-name . JSP-;

uri , . , , web.xml;

info .

<taglib> <tag>. tag <tag> </tag> :

name , taglib;

tag-class - ;

info ;

body-content empty, . , JSP-, jsp, , ,
tagdependent.

mytaglib.tld, JSP 2.0 :

<?xml version="1.0" encoding="ISO-8859-1"?>

<taglib

xmlns="http://java.sun.com/JSP/TagLibraryDescriptor"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee/ web-jsptaglibrary_2_0.xsd"

version="2.0"> <!-- -->

<tlib-version>1.0</tlib-version>

<short-name> mytag </short-name>

<uri> /WEB-INF/mytaglib.tld </uri>

<tag>

<name> getinfo </name>

<!-- -->

<tag-class> test.mytag.GetInfoTag </tag-class>

<body-content> empty </body-content>

</tag>

</taglib>

JSP 2.1 taglib :

<taglib version="2.1"

xmlns="http://java.sun.com/xml/ns/javaee"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://java.sun.com/xml/ns/javaee

web-jsptaglibrary_2_1.xsd">

URI mytaglib.tld :

1. web.xml,
<welcome-file-list\>:

<jsp-config>

<taglib>

<taglib-uri>/WEB-INF/mytaglib.tld</taglib-uri>

<taglib-location>/WEB-INF/mytaglib.tld

</taglib-location>

</taglib>

</jsp-config>

2. URI - (.tld) /WEB-INF . web.xml . , URI. , TLD- , , , .

JSP :

<!-- # 2: : demotag1.jsp -->

<HTML><HEAD>

<%@ taglib uri="/WEB-INF/mytaglib.tld"

prefix="mytag" %>

</HEAD>

<BODY>

<mytag:getinfo/>

</BODY>

</HTML>

:

Size = (3)


. *.tld , tag attribute. attribute <attribute> </attribute> :

name ( );

required , , true false ( );

rtexprvalue , JSP- ${expr} <%=expr%> ( true) ( false). false, , ( ).

, , set ().

firstname, :

// # 3: : HelloTag.java

package test.mytag; import javax.servlet.jsp.tagext.TagSupport; import java.io.IOException; public class HelloTag extends TagSupport { private String firstname; public void setFirstname(String firstname) { this. firstname = firstname; } public int doStartTag() { try { pageContext.getOut().write("Hello, " + firstname); } catch (IOException e) { e.printStackTrace(); } return SKIP_BODY; }}

mytaglib.tld
:

<tag>

<name> hello </name>

<tag-class> test.mytag.HelloTag </tag-class>

<body-content> empty </body-content>

<attribute>

<name> firstname </name>

<required> true </required>

<rtexprvalue> true </rtexprvalue>

</attribute>

</tag>

demotag2.jsp :

# 4: : demotag2.jsp

<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %><%@ taglib uri="/WEB-INF/mytaglib.tld" prefix="mytag"%>

<%@ page

language="java"

contentType="text/html; charset=CP1251"

pageEncoding="CP1251"

%><HTML><HEAD>

<TITLE>demotag2.jsp</TITLE>

</HEAD>

<BODY>

<c:set var="login" value="Bender"/>

< mytag:hello firstname ="${login}" />

</BODY>

</HTML>

:

http://localhost:8080/FirstProject/demotag2.jsp

:

Hello,

, , body. body - content. body-content:

empty ;

jsp , JSP-. JSP-;

tagdependent , . .

, BodyTagSupport, BodyTag. TagSupport ( BodyTagSupport), , :

void doInitBody() , doStartTag() doAfterBody();

int doAfterBody() . EVAL_BODY_AGAIN, doAfterBody() . SKIP_BODY, ;

int doEndTag() , .

, doStartTag() EVAL_BODY_INCLUDE EVAL_BODY_BUFFERED; SKIP_BODY, doInitBody() .

, num ( num setNum(String num)) , :

// # 5: : AttrTag.java

package test.mytag;

import java.io.IOException;

import javax.servlet.jsp.*;

import javax.servlet.jsp.tagext.*;

 

public class AttrTag extends BodyTagSupport {

private int num;

public void setNum(String num) {

this. num = new Integer(num);

}

public int doStartTag() throws JspTagException {

try {

pageContext.getOut().write(

"<TABLE BORDER=\"3\" WIDTH=\"100%\">");

pageContext.getOut().write("<TR><TD>");

} catch (IOException e) {

Throw

new JspTagException(e.getMessage());

}

return EVAL_BODY_INCLUDE;

}

public int doAfterBody()

throws JspTagException {

if (num-- > 1) {

try {

pageContext.getOut().write("</TD></TR><TR><TD>");

} catch (IOException e) {

Throw

new JspTagException(e.getMessage());

}

return EVAL_BODY_AGAIN;

} else {

return SKIP_BODY;

}

}

public int doEndTag() throws JspTagException {

try {

pageContext.getOut().write("</TD></TR>");

pageContext.getOut().write("</TABLE>");

} catch (IOException e) {

Throw

new JspTagException(e.getMessage());

}

return SKIP_BODY;

}

}

.tld :

<tag>

<name> bodyattr </name>

<tag-class> test.mytag.AttrTag </tag-class>

<body-content> JSP </body-content>

<attribute>

<name> num </name>

<required> false </required>

<rtexprvalue> true </rtexprvalue>

</attribute>

</tag>

JSP bodyattr :

# 6: : demotag3.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-5" pageEncoding="ISO-8859-5"%>

<%@ taglib uri="/WEB-INF/mytaglib.tld" prefix="mytag" %>

<HTML><HEAD>

<TITLE>Example</TITLE>

</HEAD><BODY>

<jsp:useBean id="rw" scope="request" class=

"test.my.MySet"/>

<mytag:bodyattr num="${rw.size}">

${rw.element}

</mytag:bodyattr>

<mytag:bodyattr> </mytag:bodyattr>

</BODY></HTML>

JSP :

. 22.1.

Rows, :

/* # 7: -: MySet.java */

package test.my;

public class MySet extends java.util.HashSet {

private java.util.Iterator it;

 

public MySet() {

//

this. add("Sun");

this. add("Microsoft");

this. add("IBM");

}

public String getSize() {

it = this. iterator();

return Integer.toString(this. size());

}

public String getElement() {

return it.next().toString();

}

}

action

jsp:attribute XML-, :

<%@ taglib uri="/WEB-INF/mytaglib.tld" prefix="mytag" %>

<HTML>

<mytag:hello>

<jsp:attribute name="firstname">

Bender

</jsp:attribute>

</mytag:hello>

</HTML>

:

Hello, Bender

jsp:attribute, jsp:body:

<%@ taglib uri="http://java.sun.com/jsp/jstl/core"

prefix="c"%>

<%@ taglib uri="/WEB-INF/mytaglib.tld" prefix="mytag" %>

<HTML>

<jsp:useBean id="rw" scope="request"

class="test.my.MySet"/>

<mytag:bodyattr>

<jsp:attribute name="num">

<c:out value="${requestScope.rw.size}"/>

</jsp:attribute>

<jsp:body>

<c:out value="${requestScope.rw.element}"/>

</jsp:body>

</mytag:bodyattr>

</HTML>

:

IBM
Sun
Microsoft

jsp:element name XML jsp:attribute jsp:body:

<jsp:element name="H2" >

<jsp:attribute name="Style">

color:red

</jsp:attribute>

<jsp:body>

Simple Text

</jsp:body>

</jsp:element>

:

<H2 Style="color:red">Simple Text</H2>

jsp:doBody jsp:invoke
-. jsp:doBody , JspWriter . jsp:invoke jsp:doBody -. , bodyattr :

<%@ taglib uri="http://java.sun.com/jsp/jstl/core"

prefix="c"%>

<%@ taglib prefix="tags" tagdir="/WEB-INF/tags" %>

<tags:actiondemo>

<jsp:attribute name="num">

<c:out value="${sessionScope.mysetInstance.size}"/>

</jsp:attribute>

<jsp:body>

<c:out value="${sessionScope.mysetInstance.element}"/>

</jsp:body>

</tags:actiondemo>

actiondemo.tag /WEB-INF/tags:

<%@ tag import="test.my.MySet" %>

<%@ attribute name="num" fragment="true" %>

<%@ variable name-given="mysetInstance" %>

<%session.setAttribute("mysetInstance", new MySet());%>

<TABLE border=1>

<TR><TD>Rows number: <jsp:invoke fragment="num"</TD></TR>

<TR><TD><jsp:doBody /></TD></TR>

<TR><TD><jsp:doBody /></TD></TR>

<TR><TD><jsp:doBody /></TD></TR>

</TABLE>

tag page JSP. attribute actiondemo, fragment="true", jsp:invoke. variable JSP-.

:

Rows number: 3
IBM
Sun
Microsoft

22

, (, .) .

1. , , . . . . .

2. , , , , , .

3. a1, a2,, an. Si = ai+ai+1 ++ aj 1£i£j£N . N .

4. . N , . N .

5. 100- .
, .

6. ,
k , , n m , k = n + m. , n m .

7. , , , . n . m < n , .

8. , , 1 2, 1 2 . . , , , 1 , 1 = 2, 2 , .

9. n- , ,
m . n, m . .

10. m . ,
. .

11. , , , . .

12. . 5 . (1 2, 2 3,..., 4 5) ? .

13. . , , .

14. . , ( ), .

15.
. , .

B

.

22

22.1.

<attribute> , ?

1) <attribute-name>;

2) <name>;

3) <attributename>;

4) <param-name>.

22.2.

BodyTag.
doAfterBody()?

1) BodyTag doAfterBody();

2) 0;

3) 1;

4) 0 1;

5) .

22.3.

, doStartTag() Tag.SKIP_BODY?

1) doAfterBody();

2) doBody();

3) skipBody();

4) doEndTag();.

5) .

22.4.

<taglib> web.xml?

1) <uri-tag>;

2) <tag-uri>;

3) <uri-name>;

4) <uri-location>;

5) <taglib-uri>.

22.5.

.tld?

1) value;

2) name;

3) rtexprvalue;

4) class.

22.6.

doInitBody() BodyTagSupport?

1) ;

2) ;

3) SKIP_BODY, EVAL_BODY_INCLUDE;

4) void.

22.7.

.tld , ?

1) body-content jsp;

2) script-enabled true;

3) , .

 
1

HTML

HTML (HyperText Markup Language) Internet , , , ,
, , .. JSP, , HTML-.

HTML. 1999 HTML 4.01. , XML. XHTML 1.0/ XHTML 2.0, MathML ( ) .

HTML-, HTML - , HTML, :

(Strict) , (deprecated):

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"

"http://www.w3.org/TR/html4/strict.dtd">

(Transitional) HTML:

<!DOCTYPE HTML PUBLIC

"-//W3C//DTD HTML 4.01 Transitional//EN"

"http://www.w3.org/TR/html4/loose.dtd">

(Frameset) , :

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Frameset//EN"

"http://www.w3.org/TR/html4/frameset.dtd">

, XHTML 1.0, HTML 4.0. XHTML 2.0 . font, i, b, center, align, size bgcolor. ,
. , XHTML 2.0 section, , h .

, XHTML 2.0, XML, , . :

, ;

center, font, s, u, align, bgcolor, background, clear, color, face, size, .. , HTML (, , , ..), , ;

, . .

! ( li). , : <br>, <img> .. , /.

HTML- HTML- html htm. HTML- Web-, .

HTML- (). < html> ( < > ) ( </> ). :

<html>

<!-- -->

</ html>

HTML , ( XML ).

<HEAD>

<HTML>. . :

<HTML><HEAD>

<TITLE> </TITLE>

</HEAD></HTML>

<TITLE>

Web- , <TITLE> </TITLE> , .

<BODY>

<BODY> </BODY>. , . <HTML>, <HEAD> <BODY> . , Web- .

<!-- # 1: HTML -->

<HTML>

<HEAD><TITLE> </TITLE></HEAD>

<BODY>

<!-- -->

<H1> , 1</H1>

<H6> , 6</H6>

<ADDRESS> - e-mail:[email protected]</ADDRESS> <P>

</BODY></HTML>

: <P> . <ADDRESS>
. HTML . :

<!-- -->

HTML- , , .. 1, .. . 1 :

<H1> </H1>

(start-
stop-). , . , : <P>, , , . , .

⇐ 38394041424344454647 ⇒


:

: 2016-04-03; !; : 596 |

:

:

- , - .
==> ...

1503 - | 1421 -


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