Jasper Report Xml Example

14 min read Jul 02, 2024
Jasper Report Xml Example

Generating Reports with Jasper Reports: A Comprehensive XML Example

JasperReports is a powerful and versatile open-source reporting engine widely used for generating dynamic and customizable reports. Its flexibility stems from its ability to work with various data sources, including databases, XML files, and even Java objects. One of the core components of JasperReports is the report definition, which is typically written in XML format. This XML file defines the structure, layout, and data elements of the report.

In this article, we'll explore the fundamentals of creating Jasper Reports using XML. We'll go through a step-by-step process to design, build, and execute a simple report, showcasing the key elements of a Jasper Reports XML file.

Understanding the Jasper Reports XML Structure

The Jasper Reports XML file serves as a blueprint for your report. It defines every aspect of the report, from the overall layout to individual data elements and formatting. The core structure of the Jasper Reports XML file can be broken down into several key components:

  1. <jasperReport>: This is the root element that encloses the entire report definition.

  2. <property>: These elements define report-specific properties such as the report title, author, and output format.

  3. <queryString>: This element specifies the SQL query to retrieve data for the report. This is only required if your report uses a database as a data source.

  4. <field>: These elements define the data fields that will be extracted from the data source and displayed in the report.

  5. <variable>: This element allows you to define and calculate custom values within the report using expressions.

  6. <parameter>: These elements define input parameters that can be passed to the report at runtime, allowing for greater flexibility and customization.

  7. <band>: This element defines the report's layout, dividing it into distinct sections like the title, header, detail, and footer.

  8. <staticText>: This element represents static text that will be displayed within the report.

  9. <textField>: This element displays data retrieved from the data source. You can specify the field name to be displayed.

  10. <image>: This element allows you to include images in your report.

  11. <line>: This element creates horizontal or vertical lines in the report.

A Simple Jasper Reports XML Example: Generating a Student Report

Let's create a simple Jasper Reports XML file to generate a student report. The report will display the student's name, roll number, and grade. We'll use an in-memory data source for this example, but you can easily adapt it to use a database connection.



  
  
  
  
    
  
  
  
  
  
    
  
  
    <band height="79" splitType="Stretch">
      <staticText>
        <reportElement x="0" y="0" width="535" height="30" uuid="97931a95-7e45-4031-8694-3a132654396a"/>
        <textElement textAlignment="Center">
          <font size="22" isBold="true"/>
        </textElement>
        <text><![CDATA[Student Report]]></text>
      </staticText>
    </band>
  
  
    
  
  
    
      
        
        
          
        
        
      
      
        
        
          
        
        
      
      
        
        
          
        
        
      
    
  
  
    
      
        
        
        
      
      
        
        
        
      
      
        
        
        
      
    
  
  
    
  
  
    
      
        
        
          
        
        
      
      
        
        
        
      
      
        
        
          
        
        
      
      
        
        
        
      
    
  
  
    
  

Breaking Down the Jasper Reports XML Example

  1. <jasperReport>: The root element of the report, defining basic properties such as report name, language, page dimensions, and margins.

  2. <queryString>: Since we're using an in-memory data source, this element is empty. If you were using a database, this would contain your SQL query.

  3. <field>: These elements define the data fields that will be displayed in the report: name, rollNumber, and grade.

  4. <band>: The report's layout is structured using different bands:

    • <title>: Displays the report title.
    • <columnHeader>: Displays column headers for the data fields.
    • <detail>: Contains the actual data for each student.
    • <pageFooter>: Displays page numbering information.
  5. <staticText>: This element is used for displaying static text within the report. For example, the column headers "Name," "Roll Number," and "Grade" are defined using <staticText>.

  6. <textField>: These elements are used to display data retrieved from the data source. Each <textField> references a specific field defined in the <field> section.

  7. <textFieldExpression>: This attribute within <textField> defines the expression that will be evaluated to retrieve the data. In this example, $F{name}, $F{rollNumber}, and $F{grade} are used to display the values from the corresponding fields.

Executing the Jasper Reports XML

To execute the report, you'll need to use a Jasper Reports library in your Java code. You can find detailed documentation and examples on the Jasper Reports website. Here's a basic outline of the steps involved:

  1. Compile the Jasper Reports XML File: Use a Jasper Reports tool or library to compile the XML file into a compiled report file (usually with a .jasper extension). This process converts the XML definition into a binary format that can be used for report generation.

  2. Create a Data Source: You'll need to create a data source object that provides the data to the report. This could be a JDBC connection to a database, an in-memory list of objects, or any other supported data source.

  3. Instantiate a JasperPrint Object: The JasperPrint object is responsible for holding the report data and layout. Use the compiled report file and the data source to fill the JasperPrint object.

  4. Generate the Report Output: You can generate the report output in various formats like PDF, HTML, Excel, or even a byte stream. Use the JasperPrint object and the desired output format to create the report.

Conclusion

Creating reports with Jasper Reports and Jasper Reports XML provides immense flexibility for building dynamic and customizable reports. The XML-based structure allows you to easily define the report's layout, data sources, and formatting. By understanding the key elements and their functionalities, you can effectively design and implement reports for a wide range of applications. The ability to leverage Jasper Reports XML opens up numerous possibilities for data visualization and reporting, empowering you to present your data in a clear, informative, and visually appealing manner.


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