使用itex生成pdf文件并下载总结

文件并下载总结"/>

使用itex生成pdf文件并下载总结

项目中需要根据数据库中查询到的数据生成pdf文件并下载

文章参考：
最终效果图如下：

pom文件

<dependency><groupId>com.itextpdf</groupId><artifactId>itextpdf</artifactId><version>5.4.3</version></dependency><dependency><groupId>com.lowagie</groupId><artifactId>itext</artifactId><version>2.1.7</version></dependency><dependency><groupId>com.itextpdf</groupId><artifactId>itext-asian</artifactId><version>5.2.0</version></dependency>

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Element;
import com.itextpdf.text.Font;
import com.itextpdf.text.Phrase;
import com.itextpdf.text.RectangleReadOnly;
import com.itextpdf.text.pdf.BaseFont;
import com.itextpdf.text.pdf.PdfPCell;
import com.itextpdf.text.pdf.PdfPTable;
import com.itextpdf.text.pdf.PdfWriter;/*** 生成pdf文件工具类.** @author**/
public class PdfUtil {// 表格高度private static int high = 20;// 表格宽度private static int widthPercentage = 100;private static Font keyfont;private static Font textfont;/*** BASE_PATH.*/private static final String BASE_PATH;//  private static final String FONT_PATH;
//    static {
//        FONT_PATH = PdfUtil.class.getClassLoader().getResource("WEB-INF/font/MSYH.TTC").getPath();
//    }// 静态代码块static {try {// 不同字体（这里定义为同一种字体：包含不同字号、不同style）// BaseFont bfChinese = BaseFont.createFont(FONT_PATH + ",1",BaseFont.IDENTITY_H,BaseFont.NOT_EMBEDDED);BaseFont bfChinese = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);new Font(bfChinese, 16, java.awt.Font.BOLD);new Font(bfChinese, 14, java.awt.Font.BOLD);keyfont = new Font(bfChinese, 10, java.awt.Font.BOLD);textfont = new Font(bfChinese, 10, Font.NORMAL);} catch (Exception e) {e.printStackTrace();}}static {final String os = System.getProperty("os.name");if (os.toLowerCase().startsWith("win")) {BASE_PATH = "D:\\upload\\pdf\\";} else {BASE_PATH = "/data/upload/pdf/";}new File(BASE_PATH).mkdirs();}PdfUtil() {}public static void main(String[] args) {try {String dwmc = "单位名称xxxx";// 表头文字String[] titleName = new String[] { "名称", "税率", "备注", "金额" };List<Map> data = new ArrayList<Map>();Map<String,Object> e = new HashMap<>();e.put("name","名称1");e.put("tax_rate","0.08");e.put("remark","备注1");e.put("tax_fees","123.89");data.add(e);Map<String,Object> e1 = new HashMap<>();e1.put("name","名称2");e1.put("tax_rate","0.08");e1.put("remark","备注2");e1.put("tax_fees","123.89");data.add(e1);Map<String,Object> e2 = new HashMap<>();e2.put("name","名称3");e2.put("tax_rate","0.08");e2.put("remark","备注3");e2.put("tax_fees","123.89");data.add(e2);pdfOut(dwmc,titleName,data,"生成Pdf文件.pdf");} catch (IOException e) {e.printStackTrace();} catch (DocumentException e) {e.printStackTrace();}}/*** 表格的样式** @param content*            内容* @param font*            字体对象* @param high*            表格高度* @Param isAlignCenter 是否水平居中* @Param isAlignMidde 是否垂直居中* @return*/private static PdfPCell pdfTableStyle(String content, Font font, int high, boolean isAlignMidde,int align) {PdfPCell pdfPCell = new PdfPCell(new Phrase(content, font));pdfPCell.setMinimumHeight(high);pdfPCell.setUseAscender(true); // 设置可以居中pdfPCell.setHorizontalAlignment(align); // 设置水平居中 0 左 1中 2 右//pdfPCell.setHorizontalAlignment(PdfPCell.ALIGN_CENTER); // 设置水平居中if (isAlignMidde) {pdfPCell.setVerticalAlignment(PdfPCell.ALIGN_MIDDLE); // 设置垂直居中}return pdfPCell;}public static PdfPCell createCell(String value, Font font) {PdfPCell cell = new PdfPCell();cell.setVerticalAlignment(Element.ALIGN_MIDDLE);cell.setHorizontalAlignment(Element.ALIGN_CENTER);cell.setPhrase(new Phrase(value, font));return cell;}/*** 创建单元格（指定字体、水平居..）** @param value* @param font* @param align* @return*/public static PdfPCell createCell(String value, Font font, int align) {PdfPCell cell = new PdfPCell();cell.setVerticalAlignment(Element.ALIGN_MIDDLE);cell.setHorizontalAlignment(align);cell.setPhrase(new Phrase(value, font));cell.setPaddingTop(8.0f);cell.setPaddingBottom(8.0f);return cell;}/*** 创建单元格（指定字体、水平居..、单元格跨x列合并）** @param value* @param font* @param align* @param colspan* @return*/public static PdfPCell createCell(String value, Font font, int align, int colspan) {PdfPCell cell = new PdfPCell();cell.setVerticalAlignment(Element.ALIGN_MIDDLE);cell.setHorizontalAlignment(align);cell.setColspan(colspan);cell.setPhrase(new Phrase(value, font));cell.setPaddingTop(8.0f);cell.setPaddingBottom(8.0f);return cell;}/*** 创建单元格（指定字体、水平居..、单元格跨x列合并、设置单元格内边距）** @param value* @param font* @param align* @param colspan* @param boderFlag* @return*/public static PdfPCell createCell(String value, Font font, int align, int colspan, boolean boderFlag,int height) {PdfPCell cell = new PdfPCell();cell.setVerticalAlignment(Element.ALIGN_MIDDLE);cell.setHorizontalAlignment(align);cell.setMinimumHeight(height); //高度cell.setColspan(colspan);cell.setPhrase(new Phrase(value, font));cell.setPadding(3.0f);if (!boderFlag) {cell.setBorder(0);cell.setPaddingTop(15.0f);cell.setPaddingBottom(8.0f);} else if (boderFlag) {cell.setBorder(0);cell.setPaddingTop(0.0f);cell.setPaddingBottom(15.0f);}return cell;}/*** 检查是否存在文件夹并创建** @param path* @throws IOException*/public static File creatNewFile(String path) throws IOException {File file = new File(path);File fileParent = file.getParentFile();if (!fileParent.exists()) {fileParent.mkdirs();}file.createNewFile();return file;}/*** 创建单元格（指定字体、水平..、边框宽度：0表示无边框、内边距）** @param value* @param font* @param align* @param borderWidth* @param paddingSize* @param flag* @return*/public PdfPCell createCell(String value, Font font, int align, float[] borderWidth, float[] paddingSize,boolean flag) {PdfPCell cell = new PdfPCell();cell.setVerticalAlignment(Element.ALIGN_MIDDLE);cell.setHorizontalAlignment(align);cell.setPhrase(new Phrase(value, font));cell.setBorderWidthLeft(borderWidth[0]);cell.setBorderWidthRight(borderWidth[1]);cell.setBorderWidthTop(borderWidth[2]);cell.setBorderWidthBottom(borderWidth[3]);cell.setPaddingTop(paddingSize[0]);cell.setPaddingBottom(paddingSize[1]);if (flag) {cell.setColspan(2);}return cell;}/**** @param dwmc 单位名称* @param titleName 标题名称* @param data 表格数据* @throws IOException* @throws DocumentException*/public static String pdfOut(String dwmc,String[] titleName,List<Map> data, String fileName) throws IOException, DocumentException {String path = BASE_PATH + fileName;// 判断路径中文件夹是否存在,不存在则自动创建,防止因为文件夹不存在而报错creatNewFile(path);// 新建一个pdf文档对象,前一个参数是纸张大小,后四个为边距// 设置为A4横向Document document = new Document(new RectangleReadOnly(842F, 595F));PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(path));document.open();// 添加标题// 创建第一行表格PdfPTable dwName = new PdfPTable(1);dwName.setWidthPercentage(widthPercentage); // 设置标题长度占纸张比例// 给表格赋值// tableName.addCell(pdfTableStyle("测试pdf", size14font, 50, true, true));dwName.addCell(createCell("单位名称："+ dwmc, keyfont, Element.ALIGN_LEFT,1,false,20));// 将表格添加到文档对象中document.add(dwName);// 创建第二行,并设置第二行中的表格数PdfPTable table = new PdfPTable(titleName.length);table.setWidthPercentage(widthPercentage);// 该数组是每个表格的宽度float[] floats = new float[titleName.length];// 循环将表头数据添加到第二行表格中for (int i = 0; i < titleName.length; i++) {table.addCell(pdfTableStyle(titleName[i], keyfont, high, true, 1));floats[i] = 0.1f;}// 设置表格的宽度table.setTotalWidth(floats);document.add(table);// 将数据放入表格中for (int i = 0; i < data.size(); i++) {Map objects = data.get(i);PdfPTable dataTable = new PdfPTable(titleName.length);dataTable.setWidthPercentage(widthPercentage);dataTable.setTotalWidth(floats);// 将数组中的数据按照顺序添加dataTable.addCell(pdfTableStyle(objects.get("name") == null ? "" :String.valueOf(objects.get("name")), textfont, high, true, 0));dataTable.addCell(pdfTableStyle(objects.get("tax_rate") == null ? "" :String.valueOf(objects.get("tax_rate")), textfont, high, true, 1));dataTable.addCell(pdfTableStyle(objects.get("remark") == null ? "" :String.valueOf(objects.get("remark")), textfont, high, true, 0));dataTable.addCell(pdfTableStyle(new BigDecimal(objects.get("tax_fees").toString()).toPlainString(), textfont, high, true, 2));document.add(dataTable);}document.close();writer.close();return path;}
}

开发中遇到的问题

1. pdf字体问题
   在实际项目中使用的jar包版本是：

	<dependency><groupId>com.itextpdf</groupId><artifactId>itextpdf</artifactId><version>5.5.8</version></dependency><dependency><groupId>com.itextpdf</groupId><artifactId>itext-asian</artifactId><version>5.2.0</version></dependency>

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

使用上面的字体生成的文件是没有字的，一片空白，使用了itext自带的字体但是不能展示中文，所以后来在项目中添加了微软雅黑的字体，具体代码如下：

    private static final String FONT_PATH;static {FONT_PATH = PdfUtil.class.getClassLoader().getResource("xxx/MSYH.TTC").getPath();}// 静态代码块static {try {// 不同字体（这里定义为同一种字体：包含不同字号、不同style）BaseFont bfChinese = BaseFont.createFont(FONT_PATH + ",1",BaseFont.IDENTITY_H,BaseFont.NOT_EMBEDDED);// ,1 必须添加，否则还是空白new Font(bfChinese, 16, java.awt.Font.BOLD);new Font(bfChinese, 14, java.awt.Font.BOLD);keyfont = new Font(bfChinese, 10, java.awt.Font.BOLD);textfont = new Font(bfChinese, 10, Font.NORMAL);} catch (Exception e) {e.printStackTrace();}}

2.需要将pdf文件传输给别人，开始使用的post，那边一直接受不到文件流，后来改为get就可以
3.切换到测试环境之后，下载还是有问题，最后在linux装了字体，把微软雅黑的字体放入字体目录下，代码里面兼容windows和linux之后就可以正常展示出来。