By David Geary

Hundreds of thousands of builders have came across that JavaServer Pages signify the optimum resolution for cross-platform web-based improvement. Now that they have got mastered the fundamentals of JSP, many are trying to find to deepen and improve their services. In complex JavaServer Pages, best-selling Java writer and previous JavaSoft developer David Geary offers the subtle enterprise-class options they are trying to find. Geary tackles JavaServer Pages 1.1 with an analogous exhaustive, authoritative strategy that made his image Java books such a success. He starts off with an intensive evaluation of JSP parts, servlets, and JavaBeans; then introduces customized and physique tags; and gives refined insights into JSP-based net software layout. complicated JavaServer Pages contains special chapters on internationalization, safety, databases, electronic mail integration, and company JavaBeans. for each Java developer drawn to developing server-side courses with JavaServer Pages and Sun's servlet applied sciences

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A includes another JSP page that displays form values. b. length; ++i) { %> <%= strings[i] %> <% } } %> The JSP page listed above displays the selected categories and years. b. c , the bean listed above provides JavaBeans-compliant accessories for form elements. c deals in arrays because request parameters for checkboxes and options are represented by arrays of strings. 59 Advanced JavaServer Pages Because checkboxes are selected with a "checked" attribute and options are selected with a "selected" attribute, the methods categorySelectionAttr and yearSelectionAttr return "checked" and "selected", respectively, when a checkbox or option is selected.

JSP Tip Forms, Java Beans, and the Memento Pattern The Memento design pattern stores is designed to store an object's state exter nally so that state can be restored. You can implement the Memento design pat tern for HTML forms by storing the state of a form in one or more beans. Textfields, Text Areas, and Radio Buttons Textfields, text areas, and radio buttons are grouped together in this section because they all generate a single request parameter when their form is submitted. See “Checkboxes and Options” for a discussion about elements that can generate multiple request parameters.

TagSupport provides the following functionality: • • • Locate a tag's ancestors Access a tag's ID Store and retrieve named values By default, TagSupport extensions ignore their body content and process the JSP page following their end tag. They accomplish this This is accomplished by returning SKIP_BODY from doStartTag and EVAL_PAGE from doEndTag. The TagSupport methods are listed below: // TagSupport implements the Tag interface and adds the following // methods: protected String id; protected PageContext pageContext; static Tag findAncestorWithClass(Tag, Class) Object getValue(String key) void setValue(String key, Object value) void removeValue(String key) Enumeration getValues() String getId() void setId() TagSupport extensions have access to two protected variables: the tag's ID, and the page context.

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