Java 使用模板模式设计通用流程
我有一个我为许多项目反复做的例行程序，我想推广它。我使用Java 使用模板模式设计通用流程,java,templates,design-patterns,abstract-class,Java,Templates,Design Patterns,Abstract Class,我有一个我为许多项目反复做的例行程序，我想推广它。我使用iText进行PDF操作 假设我在一个文件夹中有2000个PDF，我需要将它们压缩在一起。假设限制为每邮政编码1000 PDF。因此zip的名称将遵循以下规则：作业名称+作业顺序。例如，前1000个PDF的邮政编码名称为XNKXMN+AA，第二个邮政编码名称为XNKXMN+AB。在压缩这些PDF之前，我需要在每个PDF中添加一些文本。文本看起来类似于作业名称+作业序列+pdf序列。因此firstzip中的第一个PDF将包含以下文本XNKXM
iText作业名称作业顺序XNKXMNAAXNKXMNAB作业序列pdf序列XNKXMNAA000001XNKXMNAA000002GenericTextpublic abstract class GenericText {
private float x;
private float y;
private float rotation;
/**
* Since the text that the user want to insert onto the Pdf might vary
* from page to page, or from logical document to logical document, we allow
* the user to write their own implementation of the text. To give the user enough
* flexibility, we give them the reference to the physical page index, the logical page index.
* @param physcialPage The actual page number that the user current looking at
* @param logicalPage A Pdf might contain multiples sub-documents, <code>logicalPage</code>
* tell the user which logical sub-document the system currently looking at
*/
public abstract String generateText(int physicalPage, int logicalPage);
GenericText(float x, float y, float rotation){
this.x = x;
...
}
}
JobGenerator.javapublic String generatePrintJob(List<File> pdfList, String outputPath,
String printName, String seq, List<GenericText> textList, int maxSize)
for (int currentPdfDocument = 0; currentPdfDocument < pdfList.size(); currentPdfDocument++) {
File pdf = pdfList.get(currentPdfDocument);
if (currentPdfDocument % maxSize != 0) {
if(textList != null && !textList.isEmpty()){
for(GenericText gt : textList){
String text = gt.generateText(currentPdfDocument, currentPdfDocument)
//Add the text content to the PDF using PdfReader and PdfWriter
}
}
...
}else{
//Close the current output stream and zip output stream
seq = Utils.getNextSeq(seq);
jobPath = outputPath + File.separator + printName + File.separator + seq + ".zip"
//Open new zip output stream with the new <code>jobPath</code>
}
}
}
final String printName = printNameLookup.get(baseOutputName);
String jobSeq = config.getPrintJobSeq();
final String seq = jobSeq;
GenericText keyline = new GenericText(90, 640, 0){
@Override
public String generateText(int physicalPage, int logicalPage) {
//if logicalPage = 1, Utils.right(String.valueOf(logicalPage), 6, '0') -> 000001
return printName + seq + " " + Utils.right(String.valueOf(logicalPage), 6, '0');
}
};
textList.add(keyline);
JobGenerator pjg = new JobGenerator();
pjg.generatePrintJob(...,..., printName, jobSeq, textList, 1000);
XNKXMNAAXNKXMNAB在查看了
tototo2GenericTextmaxSizeGenerateTextGenerateTextfinal seqgeneratePrintJobelseseqint numberOfZipFiles =
(int) Math.ceil((double) pdfList.size() / maxSize);
for (int iZip = 0; iZip < numberOfZipFiles; iZip++) {
String batchSubName = generateBatchSubName(iZip); // gives AA, AB,...
for (int iFile = 0; iFile < maxSize; iFile++) {
int fileNumber = iZip * maxSize + iFile;
if (fileNumber >= pdfList.size()) // can happen for last batch
return;
String text = jobName + batchSubName + iFile;
... add "text" to pdfList.get(fileNumber)
}
}
还可以有
genericText.generateText（fileNumber）GenerateTextgenerateTextfinal seqgeneratePrintJobelseseqint numberOfZipFiles =
(int) Math.ceil((double) pdfList.size() / maxSize);
for (int iZip = 0; iZip < numberOfZipFiles; iZip++) {
String batchSubName = generateBatchSubName(iZip); // gives AA, AB,...
for (int iFile = 0; iFile < maxSize; iFile++) {
int fileNumber = iZip * maxSize + iFile;
if (fileNumber >= pdfList.size()) // can happen for last batch
return;
String text = jobName + batchSubName + iFile;
... add "text" to pdfList.get(fileNumber)
}
}
也可能有
genericText.generateText（fileNumber）GenericTextgeneratePrintJobGenericTextGenericTextGenericTextelseIfgenerateText（int-physicalPage，int-logicalPage）000001GenericTextgeneratePrintJobGenericTextGenericTextGenericTextelseIfgenerateText（int physicalPage，int