struts2的ognl标签详解（Struts2 detailed description of ognl Tags）.docVIP

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struts2的ognl标签详解（Struts2 detailed description of ognl Tags）.doc

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struts2的ognl标签详解（Struts2 detailed description of ognl Tags）

struts2的ognl标签详解（Struts2 detailed description of ognl Tags） Struts2 detailed description of OGNL Tags First, Struts2 can divide all tags into 3 categories: UI Tags: tags that are used primarily to generate HTML elements. Non UI Tags: used primarily for database access, logical control, and other tags. Ajax Tags: tags used for Ajax support. For UI tags, there are two classes: Table labels: form tags are used primarily to generate HTML pages of from elements, and regular form elements are labeled. Non form Tags: non form tags are used primarily to generate pages, trees, Tab pages, and so on. Process control label: contains labels for processes such as paging, loops, and so on. Data access Tags: mainly for the output of ValueStack values, complete internationalization and other functions of the label. Two. Use the Struts2 tag library: 1, add the tag library D definition in the Web.Xml file. (if the application is using Servlet2.3 before) 2. Now use the taglib edit command in JSP to import the tag library before you can use the tag. Three, Struts2s OGNL tag: OGNL is the abbreviation of Object Graphic Navigation Language, which is an open source project. The Struts2 framework uses OGNL as the default expression language. In the traditional OGNL expression evaluation, the system will assume that the system as long as a root object, but the Struts2 Stack Context to root object, which ValueStacke only root object one. Hypothesis: use the tag OGNL expression to evaluate, not Struts2, and the OGNL expression is called. If the systems Context contains two objects: the foo object, the name in Context is foo; the bar object, and it is called bar in the Context. Set the foo object to the root object of Context. Returns the return value of the foo.getBlah () method #foo.blah Returns the return value of the bar.getBlah () method #bar.blah You can see that the syntax of the ONGL expression is not normal and concise. Struts2 doesnt know the objects to be taken from the ValueStack acc