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This was achieved by putting a rectangle behind them, but it did not work with the grid exporters since overlapping elements are not supported there. The new frame element is recognized by the grid exporters and can be used to group elements together by nesting them inside a frame.
Frames can be nested on an unlimited number of levels.
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Groups Groups represent a flexible way to organize data on a report. We can have as many groups as we want on a report.
The order of groups declared in a report design is important because groups contain each other. One group contains the following group and so on. When a larger group encounters a rupture, all subsequent groups are reinitialized. When declaring a report group, along with its corresponding data grouping expression, we have to declare the two sections: the group's header section and the group's footer section.
See the Jasper Sample report for an example on how to define groups. Fonts and Unicode Support Now you can create your reports in any language!
New attributes in the element where introduced to allow the mapping between the Java fonts and the PDF fonts. PDF uses special font settings and there was no way to make use of them in the previous version of JasperReports. With the introduction of those new attributes, the users can specify what PDF specific font should be used to display different character sets pdfFontName attribute , what is the type of the encoding pdfEncoding attribute and whether the font should be embedded in the PDF document or not isPdfEmbedded.
To simplify the use of the font settings, a new element was introduced:. Report fonts are report level font definitions that ca be used as default or base font settings in other font definitions throughout the entire report. Since the support for international characters is somehow tied to the iText library, you can find more details about how to create PDF documents in different languages and different character sets in the iText documentation.
Styles Report styles were introduced in order to group together a set of visual properties that would then be applied to report elements that reference the report style. This new concept is an extension of the former report font concept which is now deprecated.
Report elements that reference a report style definition could override the values of any visual property defined in the style. Report styles could also reference other report styles and the same inheritance and override mechanism applies to them too.
Styles are useful when a whole range of elements need to share the same visual properties and any change made to that has to apply to all of them. This can be achieved by changing the report style they all reference.
Scriptlets All the data displayed on a report comes from the report parameters and from the report fields. This data can be processed using the report variables and their expressions. There are specific moments in time when variable processing occurs. Some variables are initialized according to their reset type when the report starts, or when a page or column break is encountered, or when a group changes.
Furthermore, variables are evaluated every time new data is fetched from the data source for every row. But only simple variable expressions cannot always implement complex functionality. This is where scriptlets intervene. Scriptlets are sequences of Java code that are executed every time a report event occurs. Through scriptlets, users now have the possibility to affect the values stored by the report variables.
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Since scriptlets work mainly with report variables, is important to have full control over the exact moment the scriptlet is executed. In order to make use of this functionality, users only have to create a scriptlet class by extending JRAbstractScriptlet class or JRDefaultScriptlet class. Those methods will be called by the report engine at the appropriate time, when filling the report. This is mostly seen in places where we do run time type identification and then cast it to appropriate reference type.
Spring provides property editors to represent properties in a different way than the object itself e. Currency or URL. Spring can register one property editor for one data type and it is required to follow the constraint mandated by base class PropertyEditorSupport. So is any class extend PropertyEditorSupport class, then it can be substituted by everywhere base class is required.
For example, every book has an ISBN number which is in always a fixed display format. For this requirement, we may write property editor in such a way — import java.
PropertyEditorSupport; import org. StringUtils; import com.
Interface Segregation Principle This principle is my favorite one. It is applicable to interfaces as single responsibility principle holds to classes. Developer Alex created an interface Reportable and added two methods generateExcel and generatedPdf.
Will he be able to use the functionality easily? He will have to implement both the methods, out of which one is extra burden put on him by designer of software.
Either he will implement another method or leave it blank. This is not a good design. So what is the solution? Solution is to create two interfaces by breaking the existing one. They should be like PdfReportable and ExcelReportable.
This will give the flexibility to user to use only required functionality only. It has different listener classes for each kind of event.
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We only need to write handlers for events, we wish to handle. Nothing is mandatory.
Some of the listeners are — FocusListener.This class acts as front controller for String based web applications. This will give we the flexibility to make changes in future without worrying the impacts of changes for another entity. This was achieved by putting a rectangle behind them, but it did not work with the grid exporters since overlapping elements are not supported there.
Now with the new chart component, the user only has to make the desired visual settings and define the expressions that will help the engine build up the chart dataset in an incremental fashion during the iteration through the report data source.
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It can make data sharing faster. In given example, we have two classes Person and Account.