最近的曲线需要用油画ZoomLine官方网站看了好几天，今天整理出来供大家参考使用
zoomline.html资源
FusionCharts Free Documentation
| FusionCharts. |
以上基本实现了图表的显示工作。假设须要导出还须要下面代码
FCExporterFormat.java源码
package com.fusioncharts.exporter.resources;import javax.servlet.http.HttpServletResponse;import com.fusioncharts.exporter.beans.ExportBean;public abstract class FCExporterFormat { abstract public Object exportProcessor(ExportBean exportBean); abstract public String exportOutput(Object exportObj, HttpServletResponse response);} FCExporterIMG.java源码 package com.fusioncharts.exporter.resources;import java.awt.image.BufferedImage;import java.io.IOException;import java.io.OutputStream;import java.io.PrintWriter;import javax.servlet.http.HttpServletResponse;import com.fusioncharts.exporter.ErrorHandler;import com.fusioncharts.exporter.FusionChartsExportHelper;import com.fusioncharts.exporter.beans.ChartMetadata;import com.fusioncharts.exporter.beans.ExportBean;import com.fusioncharts.exporter.encoders.BasicEncoder;import com.fusioncharts.exporter.encoders.JPEGEncoder;import com.fusioncharts.exporter.generators.ImageGenerator;public class FCExporterIMG extends FCExporterFormat { private ExportBean exportBean = null; public String exportOutput(Object exportObj, HttpServletResponse response) { String action = (String)exportBean.getExportParameterValue("exportaction"); String exportFormat = (String)exportBean.getExportParameterValue("exportformat"); String exportTargetWindow = (String)exportBean.getExportParameterValue("exporttargetwindow"); String fileNameWithoutExt = (String)exportBean.getExportParameterValue("exportfilename"); String extension = FusionChartsExportHelper.getExtensionFor(exportFormat.toLowerCase());; String fileName = fileNameWithoutExt+"."+ extension; StringBuffer err_warn_Codes = new StringBuffer(); BufferedImage chartImage = (BufferedImage)exportObj; boolean isHTML = false; if(action.equals("download")) isHTML=true; String noticeMessage = ""; String meta_values= exportBean.getMetadataAsQueryString(null,false,isHTML); if(action.equals("download")){ try { response.setContentType(FusionChartsExportHelper.getMimeTypeFor(exportFormat.toLowerCase())); OutputStream os = response.getOutputStream(); if(exportTargetWindow.equalsIgnoreCase("_self")){ response.addHeader("Content-Disposition", "attachment; filename=\""+fileName+"\""); //response.addHeader("Content-length",""+ios.length()); } else { response.addHeader("Content-Disposition", "inline; filename=\""+fileName+"\""); } if( exportFormat.toLowerCase().equalsIgnoreCase("jpg") || exportFormat.toLowerCase().equalsIgnoreCase("jpeg")){ JPEGEncoder jpegEncoder = new JPEGEncoder(); try { jpegEncoder.encode(chartImage,os); os.flush(); }catch(Throwable e){ //Unable to encode the buffered image System.out.println("Unable to (JPEG) encode the buffered image"); err_warn_Codes.append("E516,"); //os.flush(); // Note forward will not work in this case, as the output stream has already been opened // Hence we have to output the error directly. meta_values =exportBean.getMetadataAsQueryString(null,true,isHTML); // Reset the response to set new content type and use out instead of outputstream response.reset(); response.setContentType("text/html"); PrintWriter out = response.getWriter(); out.print(meta_values+noticeMessage+ErrorHandler.buildResponse(err_warn_Codes.toString(),isHTML)); return null; } chartImage=null; } else { BasicEncoder basicEncoder = new BasicEncoder(); try { basicEncoder.encode(chartImage,os,1F,exportFormat.toLowerCase()); os.flush(); }catch(Throwable e){ System.out.println("Unable to encode the buffered image"); err_warn_Codes.append("E516,"); //os.flush(); // Note forward will not work in this case, as the output stream has already been opened // Hence we have to output the error directly. meta_values =exportBean.getMetadataAsQueryString(null,true,isHTML); // Reset the response to set new content type and use out instead of outputstream response.reset(); response.setContentType("text/html"); PrintWriter out = response.getWriter(); out.print(meta_values+noticeMessage+ErrorHandler.buildResponse(err_warn_Codes.toString(),isHTML)); return null; } chartImage=null; } } catch (IOException e) { e.printStackTrace(); } } if(err_warn_Codes.indexOf("E") != -1) { meta_values =exportBean.getMetadataAsQueryString(null,true,isHTML); PrintWriter out; try { out = response.getWriter(); out.print(meta_values+noticeMessage+"&statusCode=1&statusMessage=successful"); } catch (IOException e) { e.printStackTrace(); } } return null; } public Object exportProcessor(ExportBean pExportBean) { exportBean = pExportBean; String stream = (String)exportBean.getStream(); ChartMetadata metadata= exportBean.getMetadata(); BufferedImage chartImage = ImageGenerator.getChartImage(stream,metadata); return chartImage; }} FCExporter.java源码 package com.fusioncharts.exporter.servlet;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletConfig;import javax.servlet.ServletContext;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import com.fusioncharts.exporter.ErrorHandler;import com.fusioncharts.exporter.FusionChartsExportHelper;import com.fusioncharts.exporter.beans.ExportBean;import com.fusioncharts.exporter.resources.FCExporterFormat;public class FCExporter extends HttpServlet { public FCExporter() { super(); } public void init(ServletConfig config) throws ServletException { super.init(config); } public void destroy() { super.destroy(); } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request,response); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { ServletContext sc = getServletContext(); String WEB_ROOT_PATH = sc.getRealPath("/"); ExportBean localExportBean = FusionChartsExportHelper.parseExportRequestStream(request); String exportFormat = (String)localExportBean.getExportParameterValue("exportformat"); String exportTargetWindow = (String)localExportBean.getExportParameterValue("exporttargetwindow"); StringBuffer err_warn_Codes = new StringBuffer(); if (localExportBean.getMetadata().getWidth() == -1 || localExportBean.getMetadata().getHeight() == -1 || localExportBean.getMetadata().getWidth() == 0 || localExportBean.getMetadata().getHeight() == 0 ) { //If Width/Height parameter is not sent, the ChartMetadata will have width/height as -1 //Raise Error E101 - Width/Height not found err_warn_Codes.append("E101,"); } if (localExportBean.getMetadata().getBgColor() == null) { //Background color not available err_warn_Codes.append("W513,"); } if (localExportBean.getStream() == null ) { //If image data not available //Raise Error E100 err_warn_Codes.append("E100,"); } String exportAction = (String)localExportBean.getExportParameterValue("exportaction"); boolean isHTML = false; if(exportAction.equals("download")) isHTML=true; if(!exportAction.equals("download")) { String fileNameWithoutExt = (String)localExportBean.getExportParameterValue("exportfilename"); String extension = FusionChartsExportHelper.getExtensionFor(exportFormat.toLowerCase());; String fileName = fileNameWithoutExt+"."+ extension; err_warn_Codes.append(ErrorHandler.checkServerSaveStatus(WEB_ROOT_PATH,fileName)); } String pathToWebAppRoot = getServletContext().getRealPath("/"); localExportBean.addExportParameter("webapproot", pathToWebAppRoot); String meta_values= localExportBean.getMetadataAsQueryString(null,true,isHTML); if(err_warn_Codes.indexOf("E") != -1) { // There are errors - forward to error page writeError(response,""+isHTML,err_warn_Codes.toString(),meta_values,exportTargetWindow); } else { // get the exporter for this format //String path = FusionChartsExportHelper.getExporterFilePath(exportFormat).replace(" ",""); // gives with .jsp extension, let us remove the extension - this is a work-around until next release, where Servlets will also be supported //int indexOfDot = path.lastIndexOf("."); //String exporterClassName = path.substring(0, indexOfDot); try { //Class exporterClass = Class.forName(exporterClassName); Class exporterClass = Class.forName("com.fusioncharts.exporter.resources.FCExporterIMG"); FCExporterFormat fcExporter = (FCExporterFormat)exporterClass.newInstance(); Object exportObject = fcExporter.exportProcessor(localExportBean); String status= fcExporter.exportOutput(exportObject, response); } catch (ClassNotFoundException e) { err_warn_Codes.append("E404"); writeError(response,""+isHTML,err_warn_Codes.toString(),meta_values,exportTargetWindow); } catch (InstantiationException e) { err_warn_Codes.append("E404"); writeError(response,""+isHTML,err_warn_Codes.toString(),meta_values,exportTargetWindow); } catch (IllegalAccessException e) { err_warn_Codes.append("E404"); writeError(response,""+isHTML,err_warn_Codes.toString(),meta_values,exportTargetWindow); } } } private void writeError(HttpServletResponse response, String isHTML, String errorCodes, String otherMessages, String exportTargetWindow) { if(isHTML==null){ isHTML = "true"; } if(otherMessages==null){ otherMessages=""; } if(errorCodes==null){ errorCodes=""; } response.setContentType("text/html"); if(exportTargetWindow.equalsIgnoreCase("_self")){ response.addHeader("Content-Disposition", "attachment;"); } else { response.addHeader("Content-Disposition", "inline;"); } PrintWriter out; try { out = response.getWriter(); out.print(ErrorHandler.buildResponse(errorCodes,new Boolean(isHTML).booleanValue())) ; out.print(otherMessages); } catch (IOException e) { } }} web.xml配置 xml version="1.0" encoding="UTF-8"?
> <web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> <servlet> <display-name>FCExporter</display-name> <servlet-name>FCExporter</servlet-name> <servlet-class>com.fusioncharts.exporter.servlet.FCExporter</servlet-class> </servlet> <servlet-mapping> <servlet-name>FCExporter</servlet-name> <url-pattern>/FCExporter</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>zoomline.html</welcome-file> </welcome-file-list> </web-app>