如何利用java實(shí)現(xiàn)生成PDF文件

第如何利用java實(shí)現(xiàn)生成PDF文件目錄1.PDF文件簡(jiǎn)介2.生成PDF2.1基于freemarker框架實(shí)現(xiàn)HTML轉(zhuǎn)PDF2.1.1引入jar包依賴:2.1.2創(chuàng)建html模板test_template：2.1.3獲取HTML內(nèi)容2.1.4生成PDF文檔總結(jié)

1.PDF文件簡(jiǎn)介

PDF是可移植文檔格式，是一種電子文件格式，具有許多其他電子文檔格式無(wú)法相比的優(yōu)點(diǎn)。PDF文件格式可以將文字、字型、格式、顏色及獨(dú)立于設(shè)備和分辨率的圖形圖像等封裝在一個(gè)文件中。該格式文件還可以包含超文本鏈接、聲音和動(dòng)態(tài)影像等電子信息，支持特長(zhǎng)文件，集成度和安全可靠性都較高。在系統(tǒng)開(kāi)發(fā)中通常用來(lái)生成比較正式的報(bào)告或者合同類的電子文檔。

2.生成PDF

2.1基于freemarker框架實(shí)現(xiàn)HTML轉(zhuǎn)PDF

2.1.1引入jar包依賴:

dependency

groupIdjectlombok/groupId

artifactIdlombok/artifactId

version1.18.20/version

/dependency

!--/artifact/com.itextpdf/html2pdf--

dependency

groupIdcom.itextpdf/groupId

artifactIdhtml2pdf/artifactId

version4.0.3/version

/dependency

!--springboot項(xiàng)目請(qǐng)?zhí)砑哟艘蕾?-

dependency

groupIdorg.springframework.boot/groupId

artifactIdspring-boot-starter-freemarker/artifactId

/dependency

!--非springboot項(xiàng)目請(qǐng)?zhí)砑哟艘蕾?-

dependency

groupIdorg.freemarker/groupId

artifactIdfreemarker/artifactId

version2.3.30/version

/dependency

2.1.2創(chuàng)建html模板test_template：

!DOCTYPEhtml

htmllang="en"

head

metacharset="UTF-8"/

titleTitle/title

style

body{font-family:SimSun;}

.title{align-content:center;text-align:center;}

.signature{float:right}

/style

/head

body

div

h1標(biāo)題/h1

h4副標(biāo)題/h4

span當(dāng)前時(shí)間:${date_time}/span

div日期：${date}/div

/div

/body

/html

2.1.3獲取HTML內(nèi)容

當(dāng)HTML模板存放在系統(tǒng)文件夾

StringtemplateDirectory="D:\\";//系統(tǒng)文件夾路徑如:D:\

當(dāng)HTML模板存放在項(xiàng)目resources/templates目錄

ClassLoaderclassLoader=PdfUtilTest.class.getClassLoader();

URLresource=classLoader.getResource("templates");

StringtemplateDirectory=resource.toURI().getPath();

示例代碼:

importcom.itextpdf.html2pdf.ConverterProperties;

importcom.itextpdf.html2pdf.HtmlConverter;

importcom.itextpdf.layout.font.FontProvider;

importfreemarker.template.Configuration;

importfreemarker.template.Template;

importlombok.extern.slf4j.Slf4j;

importjava.io.*;

import.URL;

importjava.time.LocalDateTime;

importjava.time.format.DateTimeFormatter;

importjava.util.HashMap;

importjava.util.Map;

@Slf4j

publicclassPdfUtilTest{

*獲取模板內(nèi)容

*@paramtemplateDirectory模板文件夾

*@paramtemplateName模板文件名

*@paramparamMap模板參數(shù)

*@return

*@throwsException

privatestaticStringgetTemplateContent(StringtemplateDirectory,StringtemplateName,MapString,ObjectparamMap)throwsException{

Configurationconfiguration=newConfiguration(Configuration.DEFAULT_INCOMPATIBLE_IMPROVEMENTS);

try{

configuration.setDirectoryForTemplateLoading(newFile(templateDirectory));

}catch(Exceptione){

System.out.println("--exception--");

Writerout=newStringWriter();

Templatetemplate=configuration.getTemplate(templateName,"UTF-8");

cess(paramMap,out);

out.flush();

out.close();

returnout.toString();

publicstaticvoidmain(String[]args)throwsException{

MapString,ObjectparamMap=newHashMap();

DateTimeFormatterdateTimeFormatter=DateTimeFormatter.ofPattern("yyyy-MM-ddHH:mm:ss");

paramMap.put("date_time",dateTimeFormatter.format(LocalDateTime.now()));

paramMap.put("date",dateTimeFormatter.format(LocalDateTime.now()).substring(0,10));

ClassLoaderclassLoader=PdfUtilTest.class.getClassLoader();

URLresource=classLoader.getResource("templates");

StringtemplateDirectory=resource.toURI().getPath();

StringtemplateContent=PdfUtilTest.getTemplateContent(templateDirectory,"test_template.html",paramMap);

System.out.println(templateContent);

2.1.4生成PDF文檔

示例代碼:

/**

*HTML轉(zhuǎn)PDF

*@paramcontenthtml內(nèi)容

*@paramoutPath輸出pdf路徑

*@return是否創(chuàng)建成功

publicstaticbooleanhtml2Pdf(Stringcontent,StringoutPath){

try{

ConverterPropertiesconverterProperties=newConverterProperties();

converterProperties.setCharset("UTF-8");

FontProviderfontProvider=newFontProvider();

fontProvider.addSystemFonts();

converterProperties.setFontProvider(fontProvider);

HtmlConverter.convertToPdf(content,newFileOutputStream(outPath),converterProperties);

}catch(Exceptione){

log.error("生成模板內(nèi)容失敗,{}",e);

returnfalse;

returntrue;

*HTML轉(zhuǎn)PDF

*@paramcontenthtml內(nèi)容

*@returnPDF字節(jié)數(shù)組

publicstaticbyte[]html2Pdf(Stringcontent){

ByteArrayOutputStreamoutputStream=newByteArrayOutputStream();;

try{

ConverterPropertiesconverterProperties=newConverterProperties();

converterProperties.setCharset("UTF-8");

FontProviderfontProvider=newFontProvider();

fontProvider.addSystemFonts();

converterProperties.setFontProvider(fontProvider);

HtmlConverter.convertToPdf(content,outputStream,converterProperties);

}catch(Exceptione){

log.error("生成PDF失敗,{}",e);

returnoutputStream.toByteArray();

publicstaticvoidmain(String[]args)throwsException{

MapString,ObjectparamMap=newHashMap();

DateTimeFormatterdateTimeFormatter=DateTimeFormatter.ofPattern("yyyy-MM-ddHH:mm:ss");

paramMap.put("date_time",dateTimeFormatter.format(LocalDateTime.now()));

paramMap.put("date",dateTimeFormatter.format(LocalDate