使用Itext 进行PDf导出功能

最近项目要用到pdf导出功能，这个功能此前一直都没接触过，最近通过Itext实现了，特此记录一下，方便日后需要。话不多说：

maven 依赖

<dependency>
<groupId>com.itextpdf</groupId>
<artifactId>itext-asian</artifactId>
<version>5.2.0</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.itextpdf/itextpdf -->
<dependency>
<groupId>com.itextpdf</groupId>
<artifactId>itextpdf</artifactId>
<version>5.5.10</version>
</dependency>

<!-- https://mvnrepository.com/artifact/com.lowagie/itext -->
<dependency>
<groupId>com.lowagie</groupId>
<artifactId>itext</artifactId>
<version>2.1.7</version>
</dependency>

这里使用的itext的版本不是最新的itext7，但是能够使用，完成功能。

代码

import com.itextpdf.text.*;
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 com.origin.eurybia.utils.DateUtils;

import javax.servlet.http.HttpServletResponse;
import java.util.Date;
import java.util.List;

public class ExportReportPdfUtil {

/**
* 报表导出功能
*
* @param fileName
* @param tableList
* @param response
* @throws Exception
*/
public static void export(String fileName, List<PDFTable> tableList, HttpServletResponse response) throws Exception {
Document document = new Document();

BaseFont bfChinese = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);
Font titFont = new Font(bfChinese, 20, Font.NORMAL);
Font docFont = new Font(bfChinese, 12, Font.NORMAL);
Font subTitle = new Font(bfChinese, 16, Font.NORMAL);
Font footnoteFont = new Font(bfChinese, 10, Font.NORMAL);

// 设置response参数，可以打开下载页面
response.reset();
response.setContentType("application/pdf;charset=utf-8");
response.addHeader("Content-Disposition", "attachment;filename=" + new String(fileName.getBytes("gb2312"), "ISO8859-1"));

PdfWriter.getInstance(document, response.getOutputStream());

//设置标题
document.addTitle("XXXXX");
//打开文档
document.open();

//设置title
Paragraph header = new Paragraph("XXXXX", titFont);
header.setAlignment(1);
document.add(header);
//设置报告出具时间
Paragraph time = new Paragraph("【报告出具时间：" + DateUtils.formatDate(new Date(), "yyyy 年 MM 月 dd") + " 】", docFont);
time.setIndentationLeft(300);
document.add(time);

for (PDFTable table : tableList) {
Paragraph title = new Paragraph(table.getTitle(), subTitle);
document.add(title);
if (table.getTextDescription() != null) {
Paragraph textDescription = new Paragraph(table.getTextDescription() + "\n", docFont);
textDescription.setSpacingBefore(10f);
textDescription.setIndentationLeft(50);
document.add(textDescription);
}
if (table.getFootnote() != null) {
Paragraph footnote = new Paragraph(table.getFootnote(), footnoteFont);
footnote.setIndentationLeft(50);
document.add(footnote);
}
PdfPTable conTable = new PdfPTable(table.getConWidths());
conTable.setSpacingBefore(5f);
conTable.setWidthPercentage(80);
for (PDFColumn column : table.getColumns()) {
PdfPCell cell = new PdfPCell(new Paragraph(column.getText(), docFont));
if (column.isBold) {
cell.setBackgroundColor(BaseColor.LIGHT_GRAY);
cell.setHorizontalAlignment(Element.ALIGN_CENTER);
}
cell.setSpaceCharRatio(10f);
conTable.addCell(cell);
}
document.add(conTable);
}

String str = "\n" + "厂商确认（盖章）";
Paragraph strGaiZhang = new Paragraph(str, titFont);
strGaiZhang.setIndentationLeft(250);
document.add(strGaiZhang);

//关闭文档
document.close();
}
}

这里只是简单的一个实例，其中需要注意的是

BaseFont bfChinese = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);

这句主要是用来解决中文字体的问题，关于pdf上的文字的排版需要去查看API了，对于段前段后距离多少，居中还是距离左边的距离等都有相应的方法。

这里的PDFTable和PDFColumn是自定义的表格JavaBean可以根据自己的需要自定义。

PDFTable

import java.util.List;

/**
* Created by silence on 2016/11/1.
* Desc :
*/
public class PDFTable {
private String title;
private int numColumns;
private float widthPercent;
private List<PDFColumn> columns;
private float[] conWidths;

private String textDescription;
private String footnote;

public String getTextDescription() {
return textDescription;
}

public void setTextDescription(String textDescription) {
this.textDescription = textDescription;
}

public String getFootnote() {
return footnote;
}

public void setFootnote(String footnote) {
this.footnote = footnote;
}

public float[] getConWidths() {
return conWidths;
}

public void setConWidths(float[] conWidths) {
this.conWidths = conWidths;
}

public String getTitle() {
return title;
}

public void setTitle(String title) {
this.title = title;
}

public int getNumColumns() {
return numColumns;
}

public void setNumColumns(int numColumns) {
this.numColumns = numColumns;
}

public float getWidthPercent() {
return widthPercent;
}

public void setWidthPercent(float widthPercent) {
this.widthPercent = widthPercent;
}

public List<PDFColumn> getColumns() {
return columns;
}

public void setColumns(List<PDFColumn> columns) {
this.columns = columns;
}
}

PDFColumn

/**
* Created by silence on 2016/11/1.
* Desc :
*/
public class PDFColumn {
private String text;
public boolean isBold = false;

public boolean isHeader(){
return false;
}

public String getText() {
return text;
}

public void setText(String text) {
this.text = text;
}
}

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