JSP頁面匯出PDF格式檔案基本在前端頁面可以全部完成

<script src="https://cdnjs.cloudflare.com/ajax/libs/html2canvas/0.4.1/html2canvas.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jspdf/1.0.272/jspdf.debug.js"></script>

新增下載連結的點選事件

<script type="text/javascript">
    var downPdf = document.getElementById("downLoad");
    downPdf.onclick = function() {
        downPdf.parentNode.removeChild(downPdf);
        html2canvas(document.body, {
            onrendered:function(canvas) {

                var contentWidth = canvas.width;
                var contentHeight = canvas.height;

                //一頁pdf顯示html頁面生成的canvas高度;
                var pageHeight = contentWidth / 592.28 * 841.89;
                //未生成pdf的html頁面高度
                var leftHeight = contentHeight;
                //pdf頁面偏移
                var position = 0;
                //a4紙的尺寸[595.28,841.89]，html頁面生成的canvas在pdf中圖片的寬高
                var imgWidth = 595.28;
                var imgHeight = 592.28/contentWidth * contentHeight;

                var pageData = canvas.toDataURL('image/jpeg', 1.0);

                var pdf = new jsPDF('', 'pt', 'a4');

                //有兩個高度需要區分，一個是html頁面的實際高度，和生成pdf的頁面高度(841.89)
                //當內容未超過pdf一頁顯示的範圍，無需分頁
                if (leftHeight < pageHeight) {
                    pdf.addImage(pageData, 'JPEG', 0, 0, imgWidth, imgHeight );
                } else {
                    while(leftHeight > 0) {
                        pdf.addImage(pageData, 'JPEG', 0, position, imgWidth, imgHeight)
                        leftHeight -= pageHeight;
                        position -= 841.89;
                        //避免新增空白頁
                        if(leftHeight > 0) {
                            pdf.addPage();
                        }
                    }
                }
                pdf.save('content.pdf');
            }
        })
    }
</script>

<a id="downLoad" href="javascript:void(0)">列印檔案</a>
最終生成檔案