将 CSV、TSV 和 TXT 转换为 Excel

打开 CSV 文件

逗号分隔值 (CSV) 文件包含其值由逗号分隔或分隔的记录。在 CSV 文件中,数据以表格格式存储,其字段由逗号分隔并由双引号引起来。如果字段的值包含双引号字符,则使用一对双引号字符进行转义。您还可以使用 Microsoft Excel 将电子表格数据导出到 CSV 文件。

要打开 CSV 文件,请使用**加载选项**类并选择**CSV**值,预定义在**加载格式**枚举。

例子

// For complete examples and data files, please go to https://github.com/aspose-cells/Aspose.Cells-for-Java
// The path to the documents directory.
String dataDir = Utils.getSharedDataDir(OpeningCSVFiles.class) + "loading_saving/";
// Opening CSV Files
// Creating and CSV LoadOptions object
LoadOptions loadOptions4 = new LoadOptions(LoadFormat.CSV);
// Creating an Workbook object with CSV file path and the loadOptions
// object
Workbook workbook6 = new Workbook(dataDir + "Book_CSV.csv", loadOptions4);
// Print message
System.out.println("CSV format workbook has been opened successfully.");

打开 CSV 文件并替换无效字符

在 Excel 中,打开带有特殊字符的 CSV 文件时,会自动替换这些字符。 Aspose.Cells API 完成了同样的操作,在下面给出的代码示例中进行了演示。

例子

// For complete examples and data files, please go to https://github.com/aspose-cells/Aspose.Cells-for-Java
//Source directory
String dataDir = Utils.getSharedDataDir(OpeningCSVFilesAndReplacingInvalidCharacters.class) + "LoadingSavingConvertingAndManaging/";
LoadOptions loadOptions = new LoadOptions(LoadFormat.CSV);
//Load CSV file
Workbook workbook = new Workbook(dataDir + "[20180220142533][ASPOSE_CELLS_TEST].csv", loadOptions);
System.out.println(workbook.getWorksheets().get(0).getName()); // (20180220142533)(ASPOSE_CELLS_T
System.out.println(workbook.getWorksheets().get(0).getName().length()); // 31
System.out.println("CSV file opened successfully!");

使用首选解析器打开 CSV 文件

这并不总是需要使用默认解析器设置来打开 CSV 文件。有时导入 CSV 文件不会创建预期的输出,例如日期格式不符合预期或空字段的处理方式不同。以此目的**TxtLoadOptions.PreferredParsers**可根据需要提供自己的首选解析器来解析不同的数据类型。以下示例代码演示了首选解析器的用法。

可以从以下链接下载示例源文件和输出文件以测试此功能。

示例首选解析器.csv

outputsamplePreferredParser.xlsx

例子

// For complete examples and data files, please go to https://github.com/aspose-cells/Aspose.Cells-for-Java
class TextParser implements ICustomParser
{
@Override
public Object parseObject(String s) {
return s;
}
@Override
public String getFormat() {
return "";
}
}
class DateParser implements ICustomParser {
@Override
public Object parseObject(String s) {
Date myDate = null;
SimpleDateFormat formatter = new SimpleDateFormat("dd/MM/yyyy");
try {
myDate = formatter.parse(s);
} catch (ParseException e) {
e.printStackTrace();
}
return myDate;
}
@Override
public String getFormat() {
return "dd/MM/yyyy";
}
}
public class OpeningCSVFilesWithPreferredParser {
//Source directory
private static String sourceDir = Utils.Get_SourceDirectory();
private static String outputDir = Utils.Get_OutputDirectory();
public static void main(String[] args) throws Exception {
// Initialize Text File's Load options
TxtLoadOptions oTxtLoadOptions = new TxtLoadOptions(LoadFormat.CSV);
// Specify the separatot character
oTxtLoadOptions.setSeparator(',');
// Specify the encoding scheme
oTxtLoadOptions.setEncoding(Encoding.getUTF8());
// Set the flag to true for converting datetime data
oTxtLoadOptions.setConvertDateTimeData(true);
// Set the preferred parsers
oTxtLoadOptions.setPreferredParsers(new ICustomParser[] { new TextParser(), new DateParser() });
// Initialize the workbook object by passing CSV file and text load options
Workbook oExcelWorkBook = new Workbook(sourceDir + "samplePreferredParser.csv", oTxtLoadOptions);
// Get the first cell
Cell oCell = oExcelWorkBook.getWorksheets().get(0).getCells().get("A1");
// Display type of value
System.out.println("A1: " + getCellType(oCell.getType()) + " - " + oCell.getDisplayStringValue());
// Get the second cell
oCell = oExcelWorkBook.getWorksheets().get(0).getCells().get("B1");
// Display type of value
System.out.println("B1: " + getCellType(oCell.getType()) + " - " + oCell.getDisplayStringValue());
// Save the workbook to disc
oExcelWorkBook.save(outputDir + "outputsamplePreferredParser.xlsx");
System.out.println("OpeningCSVFilesWithPreferredParser executed successfully.\r\n");
}
private static String getCellType(int type){
if(type == CellValueType.IS_STRING){
return "String";
} else if(type == CellValueType.IS_NUMERIC){
return "Numeric";
} else if(type == CellValueType.IS_BOOL){
return "Bool";
} else if(type == CellValueType.IS_DATE_TIME){
return "Date";
} else if(type == CellValueType.IS_NULL){
return "Null";
} else if(type == CellValueType.IS_ERROR){
return "Error";
} else{
return "Unknown";
}
}

打开 TSV(制表符分隔)文件

制表符分隔的文件包含电子表格数据,但没有任何格式。数据按行和列排列,例如表格和电子表格。简而言之,制表符分隔文件是一种特殊的纯文本文件,文本中的每一列之间都有一个制表符。

要打开制表符分隔的文件,开发人员应该使用**加载选项**类并选择**TSV**值,预定义在**加载格式**枚举。

例子

// For complete examples and data files, please go to https://github.com/aspose-cells/Aspose.Cells-for-Java
// The path to the documents directory.
String dataDir = Utils.getSharedDataDir(OpeningTabDelimitedFiles.class) + "loading_saving/";
// Creating and TAB_DELIMITED LoadOptions object
LoadOptions loadOptions5 = new LoadOptions(LoadFormat.TSV);
// Creating an Workbook object with Tab Delimited text file path and the
// loadOptions object
Workbook workbook7 = new Workbook(dataDir + "Book1TabDelimited.txt", loadOptions5);
// Print message
System.out.println("Tab Delimited workbook has been opened successfully.");

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