需要：itext-2.1.7.jar 和 iTextAsian.jar （*版本要匹配） 和 javabase64-1.3.1.jar 。还要echarts的包。
一、页面
<a class="link search" id="btnPDF" onclick="exportPDF();" ><span></span>导出PDF</a>
<form id="chartForm" style="display:none">
<input id="imageValue" name="base64Info" type="hidden" maxlength="50000"/>
</form>
<div id="tu" style="height:350px"> </div>
二、js
<script type="text/javascript">
var thisChart ;
$(function(){
thisChart = echarts.init(document.getElementById('tu'));
// 以此 示例图 为例子
option = {
title: {
text: 'ECharts 入门示例'
},
tooltip: {},
legend: {
data:['销量']
},
xAxis: {
data: ["衬衫","羊毛衫","雪纺衫","裤子","高跟鞋","袜子"]
},
yAxis: {},
series: [{
name: '销量',
type: 'bar',
data: [5, 20, 36, 10, 10, 20]
}]
};
thisChart.setOption(option);
});
function exportPDF(){
var chartExportUrl = 'exportPDF.htm';
var picBase64Info = thisChart.getDataURL();//获取echarts图的base64编码，为png格式。
$('#chartForm').find('input[name="base64Info"]').val(picBase64Info);//将编码赋值给隐藏域或输入框
$('#chartForm').attr('action',chartExportUrl).attr('method', 'post');//设置提交到的url地址 ,提交方式为post
$('#chartForm').submit();
}
</script>
三、action （SpringMVC框架）
/**
* 导出PDF start
*/
@RequestMapping("exportPDF")
public void exportPDF(HttpServletRequest request,HttpServletResponse response,String base64Info) throws MalformedURLException, IOException, DocumentException{
String urlAdress =request.getSession().getServletContext().getRealPath("/") //获取项目web根目录 如要保存在项目里exportFilePath=urlAdress
ResultMessage message=null;
String newFileName;
String num = String.valueOf(System.currentTimeMillis());
newFileName = "xx" + num + ".pdf";
String newPngName = newFileName.replaceFirst(".pdf", ".png");
String exportFilePath = "d:/export";
base64Info = base64Info.replaceAll(" ", "+");
BASE64Decoder decoder = new BASE64Decoder();
String[] arr = base64Info.split("base64,");
byte[] buffer;
try {
buffer = decoder.decodeBuffer(arr[1]);
} catch (IOException e) {
throw new RuntimeException();
}
OutputStream output = null;
try {
output = new FileOutputStream(new File(exportFilePath+newPngName));//生成png文件
output.write(buffer);
output.flush();
output.close();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
message=new ResultMessage(ResultMessage.Fail, "导出失败");
}
Pdf(exportFilePath+newPngName,exportFilePath+newFileName);
File f = new File(exportFilePath+newPngName);
if(f.exists()){
f.delete();
}
File file = new File("d:/export"+num+".pdf");
Desktop.getDesktop().open(file); //文件自动打开预览
/* 如要下载到本地 执行下面代码。（提交方式不能用ajax，否则不报错不弹出下载框。）
String urlss=urlAdress+num+".pdf"; //下载文件地址
String path=urlss;
File file = new File(path);// path是根据日志路径和文件名拼接出来的
String filename = file.getName();// 获取日志文件名称
InputStream fis = new BufferedInputStream(new FileInputStream(path));
byte[] buffers = new byte[fis.available()];
fis.read(buffers);
fis.close();
response.reset();
// 先去掉文件名称中的空格,然后转换编码格式为utf-8,保证不出现乱码,这个文件名称用于浏览器的下载框中自动显示的文件名
response.addHeader("Content-Disposition", "attachment;filename=" + new String(filename.replaceAll(" ", "").getBytes("utf-8"),"iso8859-1"));
response.addHeader("Content-Length", "" + file.length());
OutputStream os = new BufferedOutputStream(response.getOutputStream());
response.setContentType("application/octet-stream");
os.write(buffers);// 输出文件
os.flush();
os.close();
*/
message=new ResultMessage(ResultMessage.Success, "成功导出到D盘根目录");
addMessage(message, request);
response.sendRedirect(request.getContextPath()+"/platform/report/alertReport/list.htm");
JOptionPane.showMessageDialog(null, "导出成功"); //这种弹窗linux可能不支持。
}
//通过png文件来生成pdf文件
public File Pdf(String imagePath, String mOutputPdfFileName) throws com.lowagie.text.DocumentException, MalformedURLException, IOException {
//建立com.lowagie.text.Document对象的实例。(A4纸,左右上下边距)
Document document = new Document(PageSize.A4, 10, 10, 20, 20);
//add Chinese font 需要 下载远东字体包iTextAsian.jar
BaseFont bfChinese = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);
com.lowagie.text.Font FontChinese = new com.lowagie.text.Font(bfChinese, 10, com.lowagie.text.Font.NORMAL);
//Font fontChinese = new Font(bfChinese, 12, Font.NORMAL, Color.GREEN);
try {
//建立一个书写器(Writer)与document对象关联，通过书写器(Writer)可以将文档写入到磁盘中。
PdfWriter.getInstance(document, new FileOutputStream(mOutputPdfFileName));
//打开文档。
document.addTitle("标题");
document.open();
document.newPage();
Image png = Image.getInstance(imagePath);
float heigth = png.getHeight();
float width = png.getWidth();
int percent = this.getPercent2(heigth, width);
png.setAlignment(Image.MIDDLE);
png.setAlignment(Image.TEXTWRAP);
png.scalePercent(percent + 3);
png.setAlignment(Image.MIDDLE); //图片居中显示
document.add(new Paragraph("zzzzzzzzzzzz"));
document.add(new Paragraph("Hello World"));
document.add(png);
document.add(new Paragraph("zzzzzzzzzzzz"));
document.add(new Paragraph("Hello World"));
//添加表格 start
PdfPTable table = new PdfPTable(6);
table.setWidthPercentage(90); //表格宽度比 默认为80
Paragraph p=new Paragraph("表头",FontChinese);
PdfPCell cell = new PdfPCell(p); //表头
cell.setMinimumHeight(23f);
cell.setHorizontalAlignment(Element.ALIGN_CENTER); //水平居中
cell.setVerticalAlignment(Element.ALIGN_MIDDLE); //垂直居中
cell.setColspan(6); //合并6列
cell.setBackgroundColor(new Color(235, 235, 235));
table.addCell(cell);
PdfPCell cell2 = new PdfPCell(new Paragraph("1列",FontChinese)); //中文要放在Paragraph()里面才会显示出来
PdfPCell cell3 = new PdfPCell(new Paragraph("2列",FontChinese));
PdfPCell cell4 = new PdfPCell(new Paragraph("3列",FontChinese));
PdfPCell cell5 = new PdfPCell(new Paragraph("4列",FontChinese));
PdfPCell cell6 = new PdfPCell(new Paragraph("5列",FontChinese));
PdfPCell cell7 = new PdfPCell(new Paragraph("6列",FontChinese));
cell2.setBackgroundColor(new Color(235, 235, 235));
cell3.setBackgroundColor(new Color(235, 235, 235));
cell4.setBackgroundColor(new Color(235, 235, 235));
cell5.setBackgroundColor(new Color(235, 235, 235));
cell6.setBackgroundColor(new Color(235, 235, 235));
cell7.setBackgroundColor(new Color(235, 235, 235));
table.addCell(cell2);table.addCell(cell3);
table.addCell(cell4);table.addCell(cell5);
table.addCell(cell6);table.addCell(cell7);
//增加每行列数
for(int i=0;i<5;i++){
table.addCell("1.1我");
table.addCell("1.1");
table.addCell("2.1");
table.addCell("1.2");
table.addCell("2.2");
table.addCell("cell test1");
}
//cell.setRowspan(2); //合并行
//cell.setColspan(2); //合并列
document.add(table);
//添加表格 end
document.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (DocumentException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
File mOutputPdfFile = new File(mOutputPdfFileName);
if (!mOutputPdfFile.exists()) {
mOutputPdfFile.deleteOnExit();
return null;
}
return mOutputPdfFile;
}
//统一按照宽度压缩 这样来的效果是，所有图片的宽度是相等的
private int getPercent2(float h, float w) {
int p = 0;
float p2 = 0.0f;
p2 = 530 / w * 100;
p = Math.round(p2);
return p;
}
/**
* 导出PDF end
*/
效果图：注：先让效果出来，再根据实际需求修改。
参照出处：
http://www.open-open.com/doc/view/8d8f3fc183584f7ca52c8a4ed3a0164e PDFPTable帮助文档。
http://www.cnblogs.com/crazyjava/p/3199936.html Java生成PDF报表
http://blog.csdn.net/zwx19921215/article/details/34439851 Java通过IText导出word和pdf
http://blog.csdn.net/qq_22778121/article/details/54175358 Echarts导出为pdf