Cewolf+JFreeChart之报表代码实例大全不断更新中...

http://www.diybl.com/　2008-11-1 　网络　点击: 　[ 评论 ]

                    折线图
==============>JAVA类
package cewolf;

import java.io.Serializable;
import java.util.Date;
import java.util.Map;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.category.DefaultCategoryDataset;
import de.laures.cewolf.DatasetProduceException;
import de.laures.cewolf.DatasetProducer;
import de.laures.cewolf.links.CategoryItemLinkGenerator;
import de.laures.cewolf.tooltips.CategoryToolTipGenerator;
/**
* An example data producer.
* @author Guido Laures
*/
public class PageViewCountData implements DatasetProducer,
          CategoryToolTipGenerator,
          CategoryItemLinkGenerator,
          Serializable {
    private static final Log log = LogFactory.getLog(PageViewCountData.class);
    // These values would normally not be hard coded but produced by
    // some kind of data source like a database or a file
    private final String[] categories = { "mon",
           "tue",
           "wen",
           "thu",
           "fri",
           "sat",
           "sun"};
    private final String[] seriesNames = { "cewolfset.jsp",
           "tutorial.jsp",
           "testpage.jsp",
           "performancetest.jsp"};
/**
* Produces some random data.
*/
    public Object produceDataset(Map params)
        throws DatasetProduceException {
     log.debug("producing data.");
        DefaultCategoryDataset dataset = new DefaultCategoryDataset(){
   /**
    * @see java.lang.Object#finalize()
    *当垃圾回收器确定不存在对该对象的更多引用时，
    *由对象的垃圾回收器调用此方法
    */
   protected void finalize() throws Throwable {
    super.finalize();
    log.debug(this +" finalized.");
   }
        };
        for (int series = 0; series < seriesNames.length; series ++) {
            int lastY = (int)(Math.random() * 1000 + 1000);
            for (int i = 0; i < categories.length; i++) {
                final int y = lastY + (int)(Math.random() * 200 - 100);
                lastY = y;
                dataset.addValue(y, seriesNames[series], categories[i]);
            }
        }
        return dataset;
    }
    /**
     * This producer''s data is invalidated after 5 seconds. By this method the
     * producer can influence Cewolf''s caching behaviour the way it wants to.
     */
public boolean hasExpired(Map params, Date since) {
        log.debug(getClass().getName() + "hasExpired()");
return (System.currentTimeMillis() - since.getTime()) > 5000;
}
/**
* Returns a unique ID for this DatasetProducer
*/
public String getProducerId() {
return "PageViewCountData DatasetProducer";
}
    /**
     * Returns a link target for a special data item.
     */
    public String generateLink(Object data, int series, Object category) {
        return seriesNames[series];
    }

/**
* @see java.lang.Object#finalize()
*/
protected void finalize() throws Throwable {
super.finalize();
log.debug(this + " finalized.");
}
/**
* @see org.jfree.chart.tooltips.CategoryToolTipGenerator#generateToolTip(CategoryDataset, int, int)
*/
public String generateToolTip(CategoryDataset arg0, int series, int arg2) {
return seriesNames[series];
}
}

==============>JSP页面
<%@page contentType="text/html;charset=utf8"%>
<%@taglib uri=''/WEB-INF/tlds/cewolf.tld'' prefix=''cewolf'' %>
<HTML>
<BODY>
<H1>Page View Statistics</H1>
   <HR>
    <jsp:useBean id="pageViews"      class="cewolf.PageViewCountData"/>
    <cewolf:chart id="li