JSTL--->core core tag library->url operations

JSTL--->core core tag library->url operations

-->import, param, URL, redirect

<c:import> include static or dynamic files to the JSP page itself

The biggest difference between him and <jsp:include> is that <jsp:include> can only contain files that are the same as their own web application, and <c:import> not just ... You can also include files from different Web application or other Web sites

Syntax 1:

<c:import url= "url" [context= "context"] [var= "VarName"] [scope= "{page|request|session|application}"] [ charencoding= "Charencoding"]>

Ontology content ...

</c:import>

Syntax 2:

<c:import url= "url" [context= "context"] varreader= "Varreadername" [charencoding= "charencoding"]>

Ontology content ...

</c:import>

Property:

URL: The address that the file is contained in

Context: Under the same container, other web platforms must start with/

var: Store the contents of a package file

JSP range C for Scope:var variables

Harencodeing: Encoded format of the included file V

Arreader: Storing the contents of a package file

Give several chestnuts:

1:<c:import url= "http://java.sun.com"/>

<c:import> will add http://java.sun.com content to the Web page

or <c:import url= "Ftp://ftp.cse.yzu.edu.tw/data.txt"/>

2:<c:import url= "hello.jsp"/> hello.jsp with the current page under the same WebApps folder,

If Add/, then jump to the project root directory WebApps below, it is necessary to write <c:import url= "Images/hello.txt"/>

3: If there are different items on the unified server, the included files must be defined in Server.xml, and the Crosscontext property value of <Context> must be true, so that files under others can be called by other Web sites

Called <context path= "/others" docbase= "others" debug= "0" reloadable= "true" crosscontext= "true"/>

<c:import url= "/jsp/index.html" context= "/others"/>

In addition to the,<c:import> also provides the Var and scope properties, its storage will not be output on the page, we can take out when needed

<c:import url= "/images/hello.txt" var= "S" scope= "session"/>

<c:import url= "http://java.sun.com" >

<c:param name= "test" value= "1234"/> </c:import>

It means to include a file that specifies the URL: http://java.sun.com?test=1234

<c:url> used to generate a URL

Syntax 1: No ontology content

<c:url value= "Value" [context= "context"] [var= "VarName"] [scope= "{page|request|session|application}"]/>

Syntax 2: Ontology content

<c:url value= "Value" [context= "context"] [var= "VarName"][scope= "{page|request|session|application}"] > <c: param> Marker </c:url>

Property: Value: The URL to execute

Context: Under the same container, other web platforms must start with/

var: the JSP scope that stores the contents of the contained file Scope:var variable

Chestnuts:

<c:url value= "/http www.javaworld.com.tw" >

<c:param name= "param" value= "value"/> </c:url>

Generated URL: http://www.javaworld.com.tw?param=value

<c:redirect> directs client requests from a JSP file to other files

Syntax 1: No ontology content

<c:redirect url= "url" [context= "context"]/>

Syntax 2: Ontology content

<c:redirect url= "url" [context= "context"] > <c:param> </c:redirect >

Example: <c:redirect url= "http://www.javaworld.com.tw"/> Web page will automatically guide http://www.javaworld.com.tw

Page <c:redirect url= "/jsp/index.html" context= "/others" to other platforms/>

JSTL--->core core tag library->url operations