Jstl -- core tag

Document directory

• <C: Out>
• C: Set
• C: Remove
• C: Catch
• C: If
• C: foreach
• C: fortokens
• C: URL
• C: Import
• Job:

Jstl -- core tag <C: Out>

<C: Out value = "$ {psw}" escapexml = "$ {user! = NULL} "> cccccccccccc </C: Out>

C: Set

<C: set var = "user" value = "Tom" scope = "page"/> <C: out value = "$ {user}"> </c: out> <% Map map = new HashMap (); Request. setAttribute ("map", map ); %> <C: set property = "city" value = "baoding" target = "$ {map}"/> <Br/> <C: out value = "$ {map. city}"> </c: out> <Br/> <% Person p = new Person (); Request. setAttribute ("person", p ); %> <C: set property = "name" value = "Susan" target = "$ {person}"/> <C: out value = "$ {person. name}"/>

C: Remove

<% Session. setAttribute ("date", "2011 "); %> $ {Date} <C: remove var = "date" scope = "session"/> <C: out value = "$ {date}"> date is deleted </c: out>

C: Catch

<C: catch var = "myexception"> <% Int I = 3/0; %> </C: catch> Output exception <C: out value = "$ {myexception}"> </c: out> <Br/> Exception: <C: out value = "$ {myexception. message}"/> <br/> Stack track <C: out value = "$ {myexception. stackTrace}"/> <br/>

C: If

<C: if test = "$ {date = null}" var = "result" scope = "page"> The $ {result} expression is valid. </C: if>

C: foreach

Js

C: fortokens

<C: forTokens items = "abc efg, xy| 333" delims = ", y |" var = "item"> <C: out value = "$ {item}"/> <br/> </C: forTokens>

C: URL

1.

<C: url value = "tableDemo. jsp" var = "tablePageUrl"> </c: url> <A href = "$ {tablePageUrl}"> tableDemo </a>

2.

<! -- To Prevent Users From disabling cookies, the url tag transmits the session id as a parameter during the first access, As follows: <A href = "tableDemo. jsp; jsessionid = 4AA1BCFF81E84329D15E98E3E8DC95F6"> tableDemo </a> However, if you try again and find that you are allowed to use cookies, the session id will not be passed. For example: <A href = "tableDemo. jsp"> tableDemo </a>

------------------------------------------------------------------

3.

<Br/> If the url tag does not have the var attribute, the value is returned to the page and tableDemo. jsp is output. <br/> <C: url value = "tableDemo. jsp"/> <Br/> and if the first character of the value is '/', the project name is automatically added as its prefix and the output is/JSTL_Test/tableDemo. jsp. <br/> <C: url value = "/tableDemo. jsp"/> <Br/> <! -- The following code runs the result of <a href = "/JSTL_Test/tableDemo. jsp"> tableDemo </a> --> <A href = "<c: url value ="/tableDemo. jsp "/>"> tableDemo </a>

4.

<! -- The url tag can be embedded with the param tag to pass the value, and the url encoding can be performed automatically if the value is Chinese. --> <C: url value = "tableDemo. jsp" var = "table"> <C: param name = "city"> Baoding </c: param> </C: url> <A href = "$ {table}"> tableD </a>

C: Import

<C: Import url = "http://www.ifeng.com"> </C: Import>

Job:

Use the jstl label to implement the jiujiu multiplication rule table and display the table (set the interval color of the table)