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[英]How to disable "Remove Personal Information from file properties on save" in Excel using Java and Apache POI
[英]How can I check if an information is present or not in Excel file using Apache POI and Java Code
我有个问题:
我正在使用以下Java代码从Excel文件中读取一些信息:
HSSFWorkbook workbook = null;
try {
workbook = new HSSFWorkbook(file);
}catch (IOException ex) {
...
}
SummaryInformation summaryInfo = workbook.getSummaryInformation();
if (summaryInfo.getTitle() != null) {
System.out.println(summaryInfo.getTitle());
}
if (summaryInfo.getAuthor() != null) {
System.out.println(summaryInfo.getAuthor());
}
但是出现此错误,但我没有“标题”信息:
java.lang.NullPointerException
我在此行有此错误:
if (summaryInfo.getTitle() != null) {
现在,如何检查“标题”值(或其他值)是否存在,如果这种情况给我一个错误?
您需要确保summaryInfo
不为null。
SummaryInformation summaryInfo = workbook.getSummaryInformation();
if (summaryInfo != null) {
if (summaryInfo.getTitle() != null) {
System.out.println(summaryInfo.getTitle());
}
if (summaryInfo.getAuthor() != null) {
System.out.println(summaryInfo.getAuthor());
}
}
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