Java使用itext组件导出pdf报表,导出pdf文件一般是系统中常支持的功能,输出pdf之后可以打印,下面介绍导出pdf一般使用的功能,介绍怎么 在pdf插入浮动层图片(类似HTML中div),有(X、Y)坐标确定图片的位置。
iText使用的版本是:itextpdf-5.5.1.jar, 可以去iText官网下载
输出pdf表格
iText输出pdf最基本是输出table表格,下面是输出区域、总销售额(万元)、总利润(万元)简单的表格,创建Document文档对象,其可以加入表格table,pdf文档大小设置为A4,通过PdfWriter对象将pdf文件写入到输出流中。getPdfChineseFont()方法解决中文乱码,需要加入itext-asian.jar
float[] widths = {144, 113, 191};
FileOutputStream fos = new FileOutputStream("/Users/mike/table1.pdf");
Document document = new Document();
PdfWriter writer = PdfWriter.getInstance(document, fos);
writer.setViewerPreferences(PdfWriter.PageModeUseThumbs);
document.setPageSize(PageSize.A4);//设置A4
document.open();
PdfPTable table = new PdfPTable(widths);
table.setTotalWidth(458);
table.setHorizontalAlignment(Element.ALIGN_LEFT);
Object[][] datas = {{"区域", "总销售额(万元)", "总利润(万元)简单的表格"}, {"江苏省" , 9045, 2256}, {"广东省", 3000, 690}};
for(int i = 0; i < datas.length; i++) {
for(int j = 0; j < datas[i].length; j++) {
PdfPCell pdfCell = new PdfPCell(); //表格的单元格
Paragraph paragraph = new Paragraph(StringUtils.trimToNull(datas[i][j]), getPdfChineseFont());
pdfCell.setPhrase(paragraph);
table.addCell(pdfCell);
}
}
document.add(table); //pdf文档中加入table
document.close();
public static Font getPdfChineseFont() throws Exception {
BaseFont bfChinese = BaseFont.createFont("STSongStd-Light", "UniGB-UCS2-H",
BaseFont.NOT_EMBEDDED);
Font fontChinese = new Font(bfChinese, 12, Font.NORMAL);
return fontChinese;
}
设置表格行高、列宽
有时单元格文本比较多,需要设置表格的列宽度,在初始化PdfTable可以指定每列的宽度,使用单元格对象PdfCell设置表格行高度,
table的setLockedWidth(true)方法设置表格为固定宽度,这时必须设置setTotalWidth(458)表格宽度
FileOutputStream fos = new FileOutputStream("/Users/mike/table2.pdf");
Document document = new Document();
PdfWriter writer = PdfWriter.getInstance(document, fos);
writer.setViewerPreferences(PdfWriter.PageModeUseThumbs);
document.setPageSize(PageSize.A4);
document.open();
float[] widths = {144, 113, 191}; //设置三列表格的宽度
PdfPTable table = new PdfPTable(widths);
table.setLockedWidth(true);
table.setTotalWidth(458);
table.setHorizontalAlignment(Element.ALIGN_LEFT);
Object[][] datas = {{"区域", "总销售额(万元)", "总利润(万元)简单的表格"}, {"江苏省" , 9045, 2256}, {"广东省", 3000, 690}};
for(int i = 0; i < datas.length; i++) {
for(int j = 0; j < datas[i].length; j++) {
PdfPCell pdfCell = new PdfPCell();
pdfCell.setMinimumHeight(30);//设置表格行高
Paragraph paragraph = new Paragraph(StringUtils.trimToNull(datas[i][j]), getPdfChineseFont());
pdfCell.setPhrase(paragraph);
table.addCell(pdfCell);
}
}
document.add(table);
document.close();
设置pdf单元格样式
单元格可以设置居左、居中、居右、上下居中、设置边框、设置边框颜色、设置单元格背景颜色等, 使用PdfCell对象设置,颜色比比较简单直接时16进制rgb值。
pdfCell.setHorizontalAlignment(Element.ALIGN_CENTER);
pdfCell.setVerticalAlignment(Element.ALIGN_MIDDLE);
pdfCell.setBackgroundColor(new BaseColor(0xdd7e6b));
pdfCell.setBorderWidthTop(0.1f);
pdfCell.setBorderWidthBottom(0.1f);
pdfCell.setBorderWidthLeft(0.1f);
pdfCell.setBorderWidthRight(0.1f);
pdfCell.setBorderColorBottom(new BaseColor(0x674ea7));
pdfCell.setBorderColorLeft(new BaseColor(0x674ea7));
pdfCell.setBorderColorRight(new BaseColor(0x674ea7));
pdfCell.setBorderColorTop(new BaseColor(0x674ea7));
单元格文本设置字体样式
单元格文本可设置字体大小、颜色、斜体、粗体、下划线等,对于设置字体粗体、斜体、下划线则都使用font.setStyle()方法,
这个font是com.itextpdf.text.Font不是Java的Font, setStyle方法内部会做或操作。
Font font = getPdfChineseFont();
font.setColor(new BaseColor(0xff0000));
font.setSize(16);
font.setStyle("bold");
font.setStyle("italic");
font.setStyle("underline");
public static Font getPdfChineseFont() throws Exception {
BaseFont bfChinese = BaseFont.createFont("STSongStd-Light", "UniGB-UCS2-H",
BaseFont.NOT_EMBEDDED);
Font fontChinese = new Font(bfChinese, 12, Font.NORMAL);
return fontChinese;
}
合并单元格
PdfCell做单元格合并比较简单,直接调用setRowspan与setColspan方法,
如下第一行3列合并, 被合并的单元格不需要加入table中(table.addCell(pdfCell)),否则会出现表格错乱的情况。
pdfCell.setRowspan(1);
pdfCell.setColspan(3);
单元格中加入图片
单元格中不仅是文本、数值、也可以加入图片,直接调用pdfCell.setImage()方法。
//单元格插入图片
byte[] bt = FileUtils.readFileToByteArray(new File("/Users/mike/pie.png"));
PdfPCell pdfCell = new PdfPCell();
pdfCell.setImage(Image.getInstance(bt));//插入图片
table.addCell(pdfCell);
table.addCell(new PdfPCell());
table.addCell(new PdfPCell());
ClientAnchor anchor = helper.createClientAnchor();
anchor.setCol1(0); //图片开始列数
anchor.setRow1(4); //图片开始行数
anchor.setCol2(3); //图片结束列数
anchor.setRow2(25);//图片结束行数
drawing.createPicture(anchor, pictureIdx);
pdf中插入浮动层图片类似html中div
pdf中插入图片, iText导出pdf可以根据绝对位置X、Y坐标值插入图片,然后将image加入到pdf文档document中,上面的例子是document中加入表格table, pdf文档开始坐标位置在左下角位置,所以使用document的高度(PageSize.A4.getHeight())减去y值和图片自身高度.
//文档插入绝对位置图片
Image image = Image.getInstance(bt);
int x = 30;
int y = 230;
image.setAbsolutePosition(x + document.leftMargin(), PageSize.A4.getHeight() - y -
image.getHeight() - document.topMargin());
document.add(image);
pdf单元格中插入子表格
pdf表格中可以加入子表格,通过pdfCell.addElement(suTtable)方法加入(sub1、sub2)子表格
//插入子表格
pdfCell = new PdfPCell();
pdfCell.setRowspan(1);
pdfCell.setColspan(2);
PdfPTable suTtable = new PdfPTable(new float[]{100,100});
PdfPCell subPdfCell = new PdfPCell();
subPdfCell.setPhrase(new Paragraph("sub1", getPdfChineseFont()));
suTtable.addCell(subPdfCell);
subPdfCell = new PdfPCell();
subPdfCell.setPhrase(new Paragraph("sub2", getPdfChineseFont()));
suTtable.addCell(subPdfCell);
pdfCell.addElement(suTtable);//添加子表格
table.addCell(pdfCell);
单元格中画斜线
iText pdf单元格中画斜线另一篇有详细介绍:iText报表表格画斜线
完整例子
iText导出pdf例子
import java.io.File;
import java.io.FileOutputStream;
import org.apache.commons.io.FileUtils;
import com.itextpdf.text.BaseColor;
import com.itextpdf.text.Document;
import com.itextpdf.text.Element;
import com.itextpdf.text.Font;
import com.itextpdf.text.Image;
import com.itextpdf.text.PageSize;
import com.itextpdf.text.Paragraph;
import com.itextpdf.text.pdf.BaseFont;
import com.itextpdf.text.pdf.PdfPCell;
import com.itextpdf.text.pdf.PdfPTable;
import com.itextpdf.text.pdf.PdfWriter;
import org.apache.commons.lang.StringUtils;
public class TestExportPdf {
public static void main(String[] args) throws Exception {
FileOutputStream fos = new FileOutputStream("/Users/mike/table8.pdf");
Document document = new Document();
PdfWriter writer = PdfWriter.getInstance(document, fos);
writer.setViewerPreferences(PdfWriter.PageModeUseThumbs);
document.setPageSize(PageSize.A4);
document.open();
float[] widths = {144, 113, 191};
PdfPTable table = new PdfPTable(widths);
table.setLockedWidth(true);
table.setTotalWidth(458);
table.setHorizontalAlignment(Element.ALIGN_LEFT);
Object[][] datas = {{"区域产品销售额"},{"区域", "总销售额(万元)", "总利润(万元)简单的表格"}, {"江苏省" , 9045, 2256}, {"广东省", 3000, 690}};
for(int i = 0; i < datas.length; i++) {
for(int j = 0; j < datas[i].length; j++) {
PdfPCell pdfCell = new PdfPCell();
pdfCell.setMinimumHeight(30);
//设置单元格样式
pdfCell.setHorizontalAlignment(Element.ALIGN_CENTER);
pdfCell.setVerticalAlignment(Element.ALIGN_MIDDLE);
pdfCell.setBackgroundColor(new BaseColor(0xdd7e6b));
pdfCell.setBorder(0);
pdfCell.setBorderWidthTop(0.1f);
pdfCell.setBorderWidthBottom(0.1f);
pdfCell.setBorderWidthLeft(0.1f);
pdfCell.setBorderWidthRight(0.1f);
pdfCell.setBorderColorBottom(new BaseColor(0x674ea7));
pdfCell.setBorderColorLeft(new BaseColor(0x674ea7));
pdfCell.setBorderColorRight(new BaseColor(0x674ea7));
pdfCell.setBorderColorTop(new BaseColor(0x674ea7));
//设置单元格文本字体样式
Font font = getPdfChineseFont();
if(i == datas.length - 1 && j == 3 - 1) {
font.setColor(new BaseColor(0xff0000));
font.setSize(16);
font.setStyle("bold");
font.setStyle("italic");
font.setStyle("underline");
}
//合并单元格
if(i == 0 && j == 0) {
pdfCell.setRowspan(1);
pdfCell.setColspan(3);
}
Paragraph paragraph = new Paragraph(StringUtils.trimToNull(datas[i][j]), font);
pdfCell.setPhrase(paragraph);
table.addCell(pdfCell);
}
}
//单元格插入图片
byte[] bt = FileUtils.readFileToByteArray(new File("/Users/mike/pie.png"));
PdfPCell pdfCell = new PdfPCell();
pdfCell.setImage(Image.getInstance(bt));
table.addCell(pdfCell);
//插入子表格
pdfCell = new PdfPCell();
pdfCell.setRowspan(1);
pdfCell.setColspan(2);
PdfPTable suTtable = new PdfPTable(new float[]{100, 100});
PdfPCell subPdfCell = new PdfPCell();
subPdfCell.setPhrase(new Paragraph("sub1", getPdfChineseFont()));
suTtable.addCell(subPdfCell);
subPdfCell = new PdfPCell();
subPdfCell.setPhrase(new Paragraph("sub2", getPdfChineseFont()));
suTtable.addCell(subPdfCell);
pdfCell.addElement(suTtable);
table.addCell(pdfCell);
document.add(table);
//文档插入绝对位置图片
Image image = Image.getInstance(bt);
int x = 30;
int y = 230;
image.setAbsolutePosition(x + document.leftMargin(), PageSize.A4.getHeight() - y -
image.getHeight() - document.topMargin());
document.add(image);
document.close();
}
public static Font getPdfChineseFont() throws Exception {
BaseFont bfChinese = BaseFont.createFont("STSongStd-Light", "UniGB-UCS2-H",
BaseFont.NOT_EMBEDDED);
Font fontChinese = new Font(bfChinese, 12, Font.NORMAL);
return fontChinese;
}
}
补充一下这里有个StringUtil.trimToNull工具类jar包,commons-lang和commons-lang3都可以使用
Paragraph paragraph = new Paragraph(StringUtils.trimToNull(datas[i][j]), getPdfChineseFont());
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.3.2</version>
</dependency>