將JasperReport jrxml加載到JFrame

Question

如何在JFrame內查看我的jrxml文件？

我有以下的Java代碼：

package test; 

import java.sql.Connection; 
import java.sql.DriverManager; 
import javax.swing.JFrame; 
import net.sf.jasperreports.engine.JasperCompileManager; 
import net.sf.jasperreports.engine.JasperFillManager; 
import net.sf.jasperreports.engine.JasperPrint; 
import net.sf.jasperreports.engine.JasperReport; 
import net.sf.jasperreports.swing.JRViewer; 


public class Test extends JFrame { 

    private Connection conn = null; // database connection 

    public Test() { 

     try { 
      Class.forName("oracle.jdbc.driver.OracleDriver"); 
      conn = DriverManager.getConnection(
        "jdbc:oracle:thin:@localhost:1521:XE", 
        "test", "test"); 
      JasperReport report = JasperCompileManager.compileReport("report1.jrxml"); 
      JasperPrint print = JasperFillManager.fillReport(report, null, conn); 
      JRViewer viewer = new JRViewer(print); 
      viewer.setOpaque(true); 
      viewer.setVisible(true); 
     } catch (Exception e) { 
      e.printStackTrace(); 
     } finally { 
      try { 
       conn.close(); 
      } catch (Exception e) { 
      } 
     } 

     setSize(500, 600); 
     setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     setVisible(true); 
    } 

    /** 
    * @param args the command line arguments 
    */ 
    public static void main(String[] args) { 
     new Test(); 
    } 
} 

然而，當我嘗試運行它，我收到以下錯誤消息：

log4j:WARN No appenders could be found for logger(net.sf.jasperreports.engine.xml.JRXmlDigesterFactory). 

log4j:WARN Please initialize the log4j system properly. 

我JFrame出現，但是卻沒有我想的報告鑲嵌。

您認爲我的錯誤是什麼？

Answer 1

JRViewer是JPanel，所以不是..

viewer.setVisible(true); 

認沽..

// Add the viewer to the frame 
add(viewer); 

---

順便說一句：

} catch (Exception e) { 
} 

改變這種狀況，對。 。

} catch (Exception e) { 
    e.printStackTrace(); 
}