JSP fusioncharts 导出图片（JPG）的例子（完整工程 测试通过）

package com.fusioncharts.exporter.resources; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import java.io.OutputStream; import java.io.PrintWriter; import javax.imageio.stream.FileImageOutputStream; 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; /** * * @author InfosoftGlobal (P) Ltd. * */ public class FCExporter_IMG extends FCExporter_Format { private ExportBean exportBean=null; /* (non-Javadoc) * @see com.fusioncharts.exporter.resources.FcExporter_Format#exportOutput(java.lang.Object, javax.servlet.http.HttpServletResponse, java.lang.String, int) */ 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; String stream = (String)exportBean.getStream(); 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")){ noticeMessage = "&notice="; // For servlet api before 2.1 use the following //String requestURL = HttpUtils.getRequestURL(request).toString(); // in servlet api 2.1 use the following //String requestURL = request.getRequestURL().toString(); String pathToSaveFolder = (String)exportBean.getExportParameterValue("webapproot")+File.separator+FusionChartsExportHelper.SAVEPATH; File saveFolder = new File(pathToSaveFolder); String completeFilePath = pathToSaveFolder + File.separator + fileName; String completeFilePathWithoutExt = pathToSaveFolder + File.separator + fileNameWithoutExt; File saveFile = new File(completeFilePath); if(saveFile.exists()) { noticeMessage+=ErrorHandler.getErrorForCode("W509"); if(!FusionChartsExportHelper.OVERWRITEFILE){ if(FusionChartsExportHelper.INTELLIGENTFILENAMING) { noticeMessage+=ErrorHandler.getErrorForCode("W514"); completeFilePath= FusionChartsExportHelper.getUniqueFileName(completeFilePathWithoutExt,extension); File tempFile= new File(completeFilePath); fileName = tempFile.getName(); noticeMessage+=ErrorHandler.getErrorForCode("W515")+ fileName; err_warn_Codes.append("W515,"); } } } // In Save mode, send back Successful response back to chart // In save mode, isHTML is false String pathToDisplay=FusionChartsExportHelper.HTTP_URI+"/"+fileName; if (FusionChartsExportHelper.HTTP_URI.endsWith("/")) { pathToDisplay=FusionChartsExportHelper.HTTP_URI+fileName; } meta_values =exportBean.getMetadataAsQueryString(pathToDisplay,false,isHTML); try{ // Now encode and save to file FileImageOutputStream fios = new FileImageOutputStream(new File(completeFilePath)); if( exportFormat.toLowerCase().equalsIgnoreCase("jpg") || exportFormat.toLowerCase().equalsIgnoreCase("jpeg")){ JPEGEncoder jpegEncoder = new JPEGEncoder(); try { jpegEncoder.encode(chartImage,fios); }catch(Throwable e){ //TODO Unable to encode the buffered image err_warn_Codes.append("E516,"); } chartImage=null; } else { BasicEncoder basicEncoder = new BasicEncoder(); try { basicEncoder.encode(chartImage,fios,1F,exportFormat.toLowerCase()); }catch(Throwable e){ System.out.println(" Unable to encode the buffered image"); err_warn_Codes.append("E516,"); } chartImage=null; } } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } if(err_warn_Codes.indexOf("E")<0){ // if there are no errors PrintWriter out; try { out = response.getWriter(); out.print(meta_values+noticeMessage+"&statusCode=1&statusMessage=successful"); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } else{ 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) { // TODO Auto-generated catch block 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) { // TODO Auto-generated catch block e.printStackTrace(); } } return null; } public Obje