从DataTable构建表

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通常,您的应用程序将从数据库中提取数据并以DataTable的形式存储。 您可能希望轻松地将此数据作为新表插入到文档中,并快速将格式应用于整个表。

使用Aspose.Words,您可以轻松地从数据库中检索数据并将其存储为表:

  1. Document上创建一个新的DocumentBuilder对象。
  2. 使用DocumentBuilder启动一个新表。
  3. 如果我们想将DataTable中的每个列的名称作为标题行插入,那么遍历每个数据列并将列名写入表中的一行。
  4. 遍历DataTable中的每个DataRow:
    1. 遍历DataRow中的每个对象。
    2. 使用DocumentBuilder将对象插入到文档中。 使用的方法取决于插入的对象的类型,例如[DocumentBuilder.writeln()](https://reference.aspose.com/words/java/com.aspose.words/documentbuilder/#writeln())用于文本,[DocumentBuilder.insertImage()](https://reference.aspose.com/words/java/com.aspose.words/documentbuilder/#insertImage(byte[]))用于表示图像的字节数组。
    3. 在数据行的处理结束时,也通过使用DocumentBuilder.endRow()结束由DocumentBuilder创建的行。
  5. 处理完DataTable中的所有行后,通过调用DocumentBuilder.endTable()完成表。
  6. 最后,我们可以使用适当的表属性之一(如Table.getStyleIdentifier())设置所需的表样式,以自动将格式应用于整个表。 在这个例子中使用了DataTable中的以下数据:

build-a-table-from-a-datatable-aspose-words-java-1

下面的代码示例演示如何在Aspose.Words中执行上述算法:

// For complete examples and data files, please go to https://github.com/aspose-words/Aspose.Words-for-Java.git.
/// <summary>
/// Imports the content from the specified DataTable into a new Aspose.Words Table object.
/// The table is inserted at the document builder's current position and using the current builder's formatting if any is defined.
/// </summary>
public Table importTableFromDataTable(DocumentBuilder builder, DataTable dataTable,
boolean importColumnHeadings)
{
Table table = builder.startTable();
// Check if the columns' names from the data source are to be included in a header row.
if (importColumnHeadings)
{
// Store the original values of these properties before changing them.
boolean boldValue = builder.getFont().getBold();
int paragraphAlignmentValue = builder.getParagraphFormat().getAlignment();
// Format the heading row with the appropriate properties.
builder.getFont().setBold(true);
builder.getParagraphFormat().setAlignment(ParagraphAlignment.CENTER);
// Create a new row and insert the name of each column into the first row of the table.
for (DataColumn column : dataTable.getColumns())
{
builder.insertCell();
builder.writeln(column.getColumnName());
}
builder.endRow();
// Restore the original formatting.
builder.getFont().setBold(boldValue);
builder.getParagraphFormat().setAlignment(paragraphAlignmentValue);
}
for (DataRow dataRow : (Iterable<DataRow>) dataTable.getRows())
{
for (Object item : dataRow.getItemArray())
{
// Insert a new cell for each object.
builder.insertCell();
switch (item.getClass().getName())
{
case "DateTime":
// Define a custom format for dates and times.
Date dateTime = (Date) item;
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("MMMM d, yyyy");
builder.write(simpleDateFormat.format(dateTime));
break;
default:
// By default any other item will be inserted as text.
builder.write(item.toString());
break;
}
}
// After we insert all the data from the current record, we can end the table row.
builder.endRow();
}
// We have finished inserting all the data from the DataTable, we can end the table.
builder.endTable();
return table;
}

然后可以使用DocumentBuilder和数据轻松调用该方法。

下面的代码示例演示如何从DataTable导入数据并将其插入到文档中的新表中:

// For complete examples and data files, please go to https://github.com/aspose-words/Aspose.Words-for-Java.git.
Document doc = new Document();
// We can position where we want the table to be inserted and specify any extra formatting to the table.
DocumentBuilder builder = new DocumentBuilder(doc);
// We want to rotate the page landscape as we expect a wide table.
doc.getFirstSection().getPageSetup().setOrientation(Orientation.LANDSCAPE);
DataSet ds = new DataSet();
ds.readXml(getMyDir() + "List of people.xml");
// Retrieve the data from our data source, which is stored as a DataTable.
DataTable dataTable = ds.getTables().get(0);
// Build a table in the document from the data contained in the DataTable.
Table table = importTableFromDataTable(builder, dataTable, true);
// We can apply a table style as a very quick way to apply formatting to the entire table.
table.setStyleIdentifier(StyleIdentifier.MEDIUM_LIST_2_ACCENT_1);
table.setStyleOptions(TableStyleOptions.FIRST_ROW | TableStyleOptions.ROW_BANDS | TableStyleOptions.LAST_COLUMN);
// For our table, we want to remove the heading for the image column.
table.getFirstRow().getLastCell().removeAllChildren();
doc.save(getArtifactsDir() + "WorkingWithTables.BuildTableFromDataTable.docx");

下图所示的表格是通过运行上述代码生成的。

build-a-table-from-a-datatable-aspose-words-java-2