生成base64图片数据 var dataUrl = canvas.toDataURL('image/png'); //指定格式，也可不带参数 var formData = new FormData(); //模拟表单对象 formData.append("imgData",convertBase64UrlToBlob(dataUrl)); //写入数据 var xhr = new XMLHttpRequest(); //数据传输方法 xhr.open("POST","../bulletin/exportPdf"); //配置传输方式及地址 xhr.send(formData); xhr.onreadystatechange = function(){ //回调函数 if(xhr.readyState == 4){ if (xhr.status == 200) { var back = JSON.parse(xhr.responseText); if(back.success == true){ alertBox({content: 'Pdf导出成功！',lock: true,drag: false,ok: true}); }else{ alertBox({content: 'Pdf导出失败！',ok: true}); } } } }; } });

//将以base64的图片url数据转换为Blob
function convertBase64UrlToBlob(urlData){
//去掉url的头，并转换为byte
var bytes=window.atob(urlData.split(',')[1]);
//处理异常,将ascii码小于0的转换为大于0
var ab = new ArrayBuffer(bytes.length);
var ia = new Uint8Array(ab);
for (var i = 0; i < bytes.length; i++) {
ia[i] = bytes.charCodeAt(i);
}
return new Blob( [ab],{type : 'image/png'});
}

自定义结果格式 String filePath = "c:\\exportPdf2.pdf"; String imagePath = "c:\\exportImg2.bmp"; Document document = new Document(); try{ Map getMap = request.getFileMap(); MultipartFile mfile = (MultipartFile) getMap.get("imgData"); //获取数据 InputStream file = mfile.getInputStream(); byte[] fileByte = FileCopyUtils.copyToByteArray(file);

FileImageOutputStream imageOutput = new FileImageOutputStream(new File(imagePath));//打开输入流
imageOutput.write(fileByte,fileByte.length);//<a href="https://www.jb51.cc/tag/shengcheng/" target="_blank" class="keywords">生成</a>本地<a href="https://www.jb51.cc/tag/tupian/" target="_blank" class="keywords">图片</a><a href="https://www.jb51.cc/tag/wenjian/" target="_blank" class="keywords">文件</a>
imageOutput.close();

PdfWriter.getInstance(document,new FileOutputStream(filePath)); //itextpdf<a href="https://www.jb51.cc/tag/wenjian/" target="_blank" class="keywords">文件</a>

// document.setPageSize(PageSize.A2);
document.open();
document.add(new Paragraph("JUST TEST ..."));
Image image = Image.getInstance(imagePath); //itext-pdf-image
float heigth = image.getHeight();
float width = image.getWidth();
int percent = getPercent2(heigth,width); //按比例缩小图片
image.setAlignment(Image.MIDDLE);
image.scalePercent(percent+3);
document.add(image);
document.close();

result.setSuccess(true);
operatelogService.addOperateLogInfo(request,"导出成功：成功导出简报Pdf");

}catch (DocumentException de) {
System.err.println(de.getMessage());
}
catch (Exception e) {
e.printStackTrace();
result.setSuccess(false);
result.setErrorMessage(e.toString());
try {
operatelogService.addOperateLogError(request,"导出失败：服务器异常");
} catch (Exception e1) {
e1.printStackTrace();
}
}
response.getWriter().print(JSONObject.fromObject(result).toString());
}

private static int getPercent2(float h,float w) {
int p = 0;
float p2 = 0.0f;
p2 = 530 / w * 100;
p = Math.round(p2);
return p;
}