首頁 > 其他

Web工程採用JFreeChart作柱狀圖簡單一實例

來源：互聯網
上載者：User
創建阿里雲帳戶，並獲得超過 40 款產品的免費試用版；而企業帳戶則可以享有總值 $1200 的免費試用版。立即註冊！

建立一個web 工程，發布到tomcat

建立一個Servlet，配置自動。

Servlet代碼： 

import java.awt.Color;import java.awt.Font;import java.io.FileOutputStream;import java.io.IOException;import java.io.OutputStream;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.jfree.chart.ChartFactory;import org.jfree.chart.ChartUtilities;import org.jfree.chart.JFreeChart;import org.jfree.chart.axis.CategoryAxis;import org.jfree.chart.axis.ValueAxis;import org.jfree.chart.labels.ItemLabelAnchor;import org.jfree.chart.labels.ItemLabelPosition;import org.jfree.chart.labels.StandardCategoryItemLabelGenerator;import org.jfree.chart.plot.CategoryPlot;import org.jfree.chart.plot.PlotOrientation;import org.jfree.chart.renderer.category.BarRenderer3D;import org.jfree.data.category.CategoryDataset;import org.jfree.data.general.DatasetUtilities;import org.jfree.ui.TextAnchor;/** * Servlet implementation class EmployeeCommServlet */public class EmployeeCommServlet extends HttpServlet {private static final long serialVersionUID = 1L;    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {this.doPost(request, response);}protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {request.setCharacterEncoding("utf-8");try{double[][] data = new double[][] {{1320}, {720}, {830}, {400}, {1000}, {1500}};  String[] rowKeys = {"201201", "201202", "201203", "201204", "201205", "201206"};  String[] columnKeys = {""}; CategoryDataset dataset = DatasetUtilities.createCategoryDataset(rowKeys, columnKeys, data);   JFreeChart chart = ChartFactory.createBarChart3D("2012上半年傭金",                     "年月","傭金",dataset,                    PlotOrientation.VERTICAL,                    true,                    false,                    false);  //設定標題字型，可以處理亂碼問題chart.getTitle().setFont(new Font("宋體", Font.BOLD,12));CategoryPlot plot = chart.getCategoryPlot();    //X軸CategoryAxis domainAxis = plot.getDomainAxis();//設定設定Y軸上的文字  domainAxis.setTickLabelFont(new Font("sans-serif", Font.PLAIN, 11));//設定Y軸的標題文字domainAxis.setLabelFont(new Font("宋體", Font.PLAIN, 12)); //Y軸ValueAxis numberaxis = plot.getRangeAxis();//設定設定Y軸上的文字  numberaxis.setTickLabelFont(new Font("sans-serif", Font.PLAIN, 12));    //設定Y軸的標題文字  numberaxis.setLabelFont(new Font("黑體", Font.PLAIN, 12));    //這句代碼解決了底部漢字亂碼的問題 chart.getLegend().setItemFont(new Font("宋體", Font.PLAIN, 12));  //設定網格背景顏色  plot.setBackgroundPaint(Color.white);  //設定網格豎線顏色  plot.setDomainGridlinePaint(Color.pink);  //設定網格橫線顏色  plot.setRangeGridlinePaint(Color.pink);    //顯示每個柱的數值，並修改該數值的字型屬性  BarRenderer3D renderer = new BarRenderer3D();  renderer.setBaseItemLabelGenerator(new StandardCategoryItemLabelGenerator());  renderer.setBaseItemLabelsVisible(true);    //預設的數字顯示在柱子中，通過如下兩句可調整數位顯示  //注意：此句很關鍵，若無此句，那數位顯示會被覆蓋，給人數字沒有顯示出來的問題  renderer.setBasePositiveItemLabelPosition(new ItemLabelPosition(ItemLabelAnchor.OUTSIDE12, TextAnchor.BASELINE_LEFT));  renderer.setItemLabelAnchorOffset(10D);    //設定每個月份所包含的多種傭金柱的之間距離，如果每個月需要分別顯示多種傭金的話  //renderer.setItemMargin(0.4);  plot.setRenderer(renderer);      int width = 600;int height= 400;String fileName = "comm.jpeg";String url  = request.getSession().getServletContext().getRealPath("\\");System.out.println(url);    OutputStream os = new FileOutputStream(url+fileName);    ChartUtilities.writeChartAsJPEG(os, chart, width, height);        os.flush();    if(os != null)    os.close();        request.setAttribute("pic", fileName);    request.setAttribute("width", width);    request.setAttribute("height", height);        request.getRequestDispatcher("/employee.jsp").forward(request, response);    }catch(Exception e){e.printStackTrace();}}}

JSP：

<%@ page language="java" contentType="text/html; charset=gbk" pageEncoding="utf-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><title>Employee Commission</title></head><body><img src="<%=request.getAttribute("pic") %>" width="<%=request.getAttribute("width") %>" height="<%=request.getAttribute("height") %>" ><p><a href="http://lapulande.iteye.com/blog/847961" target="_blank">參考文檔一</a><br><br><a href="http://www.jfree.org/jfreechart/" target="">JFree官方學習網</a><br><a href="http://www.jfree.org/jfreechart/api/javadoc/index.html" target="">JFree官方API</a><br><a href="http://www.jfree.org/jfreechart/" target="">JFree官方學習網</a><br>不懂多上網查</p><br><a href="CommDetailServlet" >詳細圖</a></body></html>

完事了。

本文章原先以中文撰寫並發佈於 aliyun.com，亦設英文版本，僅作資訊用途。本網站不對文章的準確性，完整性或可靠性或其任何翻譯作出任何明示或暗示的陳述或保證。如對該文章有任何疑慮或投訴，請傳送電郵至 info-contact@alibabacloud.com 並提供相關疑慮或投訴的詳細說明。職員會於 5 個工作天內與您聯絡，一經驗證之後，即會刪除該侵權內容。

聯繫我們

該頁面正文內容均來源於網絡整理，並不代表阿里雲官方的觀點，該頁面所提到的產品和服務也與阿里云無關，如果該頁面內容對您造成了困擾，歡迎寫郵件給我們，收到郵件我們將在5個工作日內處理。

如果您發現本社區中有涉嫌抄襲的內容，歡迎發送郵件至： info-contact@alibabacloud.com 進行舉報並提供相關證據，工作人員會在 5 個工作天內聯絡您，一經查實，本站將立刻刪除涉嫌侵權內容。

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

Get Started for Free

  • Sales Support

    1 on 1 presale consultation

    Chat Contact Sales

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

    Open a Ticket

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.

    Learn More