可以使用iText. 您需要使用自定义表格定位和自定义行列写入。
我能够调整这个 iText 示例以水平和垂直地在多个页面上书写。这个想法是记住在页面上垂直进入的开始行和结束行。我已经把整个代码，所以你可以很容易地运行它。
public class Main {
public static final String RESULT = "results/part1/chapter04/zhang.pdf";
public static final float PAGE_HEIGHT = PageSize.A4.getHeight() - 100f;
public void createPdf(String filename)
throws IOException, DocumentException {
// step 1
Document document = new Document();
// step 2
PdfWriter writer
= PdfWriter.getInstance(document, new FileOutputStream(filename));
// step 3
document.open();
//setup of the table: first row is a really tall one
PdfPTable table = new PdfPTable(new float[] {1, 5, 5, 1});
StringBuilder sb = new StringBuilder();
for(int i = 0; i < 50; i++) {
sb.append("tall text").append(i + 1).append("\n");
}
for(int i = 0; i < 4; i++) {
table.addCell(sb.toString());
}
for (int i = 0; i < 50; i++) {
sb = new StringBuilder("some text");
table.addCell(sb.append(i + 1).append(" col1").toString());
sb = new StringBuilder("some text");
table.addCell(sb.append(i + 1).append(" col2").toString());
sb = new StringBuilder("some text");
table.addCell(sb.append(i + 1).append(" col3").toString());
sb = new StringBuilder("some text");
table.addCell(sb.append(i + 1).append(" col4").toString());
}
// set the total width of the table
table.setTotalWidth(600);
PdfContentByte canvas = writer.getDirectContent();
ArrayList<PdfPRow> rows = table.getRows();
//check every row height and split it if is taller than the page height
//can be enhanced to split if the row is 2,3, ... n times higher than the page
for (int i = 0; i < rows.size(); i++) {
PdfPRow currentRow = rows.get(i);
float rowHeight = currentRow.getMaxHeights();
if(rowHeight > PAGE_HEIGHT) {
PdfPRow newRow = currentRow.splitRow(table,i, PAGE_HEIGHT);
if(newRow != null) {
rows.add(++i, newRow);
}
}
}
List<Integer[]> chunks = new ArrayList<Integer[]>();
int startRow = 0;
int endRow = 0;
float chunkHeight = 0;
//determine how many rows gets in one page vertically
//and remember the first and last row that gets in one page
for (int i = 0; i < rows.size(); i++) {
PdfPRow currentRow = rows.get(i);
chunkHeight += currentRow.getMaxHeights();
endRow = i;
//verify against some desired height
if (chunkHeight > PAGE_HEIGHT) {
//remember start and end row
chunks.add(new Integer[]{startRow, endRow});
startRow = endRow;
chunkHeight = 0;
i--;
}
}
//last pair
chunks.add(new Integer[]{startRow, endRow + 1});
//render each pair of startRow - endRow on 2 pages horizontally, get to the next page for the next pair
for(Integer[] chunk : chunks) {
table.writeSelectedRows(0, 2, chunk[0], chunk[1], 236, 806, canvas);
document.newPage();
table.writeSelectedRows(2, -1, chunk[0], chunk[1], 36, 806, canvas);
document.newPage();
}
document.close();
}
public static void main(String[] args) throws IOException, DocumentException {
new Main().createPdf(RESULT);
}
}
我知道这iText对于报告来说可能太低了，但它可以与标准报告工具一起使用，以满足此类特殊需求。
更新：现在首先拆分高于页面高度的行。如果行高 2、3、...、n 倍，则代码不会进行拆分，但也可以对此进行调整。
