1.准备工作：
网上下载highcharts导出的关键dll。
1）、Svg.dll：因为highcharts的格式其实就是一个xml，采用svg的方式画图；
2）、itextsharp.dll：这样主要是用于处理和提取highcharts图表内的文字以及编码问题；
2.创建一个简单asp.net项目，并把上述两个程序集引入到项目中，OK。
3.给出页面代码：
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="HCExport.aspx.cs" Inherits="HighCharts_Web.HCExport" ValidateRequest="false" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script type="text/javascript" src="Scripts/highcharts/jquery-1.8.3.min.js"></script>
<script type="text/javascript" src="Scripts/highcharts/highcharts.js"></script>
<script type="text/javascript" src="Scripts/highcharts/exporting.js"></script>
<script type="text/javascript">
var chart;
$(function () {
$(document).ready(function () {
chart = new Highcharts.Chart({
chart: {
renderTo: ‘container‘,
plotBackgroundColor: null,
plotBorderWidth: null,
plotShadow: false
},
title: {
text: ‘Browser market shares at a specific website, 2010‘
},
tooltip: {
pointFormat: ‘{series.name}: <b>{point.percentage}%</b>‘,
percentageDecimals: 1
},
plotOptions: {
pie: {
allowPointSelect: true,
cursor: ‘pointer‘,
dataLabels: {
enabled: true,
color: ‘#000000‘,
connectorColor: ‘#000000‘,
formatter: function () {
return ‘<b>‘ + this.point.name + ‘</b>: ‘ + this.percentage + ‘ %‘;
}
},
showInLegend: true //是否显示图例
}
},
exporting: {
filename: ‘mychart‘,
url: "/HCExport.aspx"
},
series: [{
type: ‘pie‘,
name: ‘Browser share‘,
data: [
[‘Firefox‘, 45.0],
[‘IE‘, 26.8],
{
name: ‘Chrome‘,
y: 12.8,
sliced: true,
selected: true
},
[‘Safari‘, 8.5],
[‘Opera‘, 6.2],
[‘Others‘, 0.7]
]
}]
});
});
});
</script>
</head>
<body>
<div id="container" style="min-width: 400px; height: 400px; margin: 0 auto">
</div>
<div style="text-align:center; width:100%;">
<input type="button" value="保存图表至服务器（默认保存为PNG格式可自行调整)" onclick="SaveChart()" />
</div>
<script type="text/javascript" language="javascript">
//也可以直接用异步提交方式，这样可以防止页面刷新
function ExportChart() {
$.ajax(
{
type: ‘POST‘, //post方式异步提交
async: false, //同步提交
url: "/highcharts_export.aspx", //导出图表的服务页面地址
dataType: "json", //传递方式为json
//几个重要的参数 如果这里不传递width的话，需要修改导出服务页面内的Request.Form["width"].ToString() 把这句代码注释掉即可
data: { type: ‘image/png‘, filename: ‘MyChartTest‘, width: 400, svg: chart.getSVG() },
success: function (msg) {
alert("图表导出成功!");
},
error: function (errorMsg) {
if (errorMsg.statusText == "OK") {
alert("图表导出成功!");
} else {
alert("图表导出失败!");
}
}
}
);
}
//保存图表
function SaveChart() {
chart.exportChart({
type: ‘image/png‘,
filename: ‘mychart‘
});
}
</script>
</body>
</html>
4.服务器上的代码：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.IO;
using System.Text;
using System.Drawing.Imaging;
using iTextSharp.text.pdf;
using iTextSharp.text;
using Svg;
using System.Xml;
namespace HighCharts_Web
{
public partial class HCExport : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
//判断参数是否正确
//type是可以自己指定的导出类型
//svg是默认传递的
//filename是可以自己指定的文件名
if (Request.Form["type"] != null && Request.Form["svg"] != null && Request.Form["filename"] != null)
{
//获得相应参数
string tType = Request.Form["type"].ToString();
string tSvg = Request.Form["svg"].ToString();
string tFileName = Request.Form["filename"].ToString();
if (tFileName == "")
{
tFileName = "chart";
}
//将svg转换为二进制流
MemoryStream tData = new MemoryStream(Encoding.ASCII.GetBytes(tSvg));
MemoryStream tStream = new MemoryStream();
string tTmp = new Random().Next().ToString();
string tExt = "";
string tTypeString = "";
//获取导出类型
switch (tType)
{
case "image/png":
tTypeString = "-m image/png";
tExt = "png";
break;
case "image/jpeg":
tTypeString = "-m image/jpeg";
tExt = "jpg";
break;
case "application/pdf":
tTypeString = "-m application/pdf";
tExt = "pdf";
break;
case "image/svg+xml":
tTypeString = "-m image/svg+xml";
tExt = "svg";
break;
}
if (tTypeString != "")
{
string tWidth = Request.Form["width"].ToString();
SvgDocument tSvgObj = SvgDocument.Open<SvgDocument>(tData);
switch (tExt)
{
case "jpg":
tSvgObj.Draw().Save(tStream, ImageFormat.Jpeg);
//DELETING SVG FILE
//if (File.Exists(Server.MapPath(null) + ConfigurationManager.AppSettings["EXPORT_TEMP_FOLDER"].ToString() + tSvgOuputFile))
//{
// File.Delete(Server.MapPath(null) + ConfigurationManager.AppSettings["EXPORT_TEMP_FOLDER"].ToString() + tSvgOuputFile);
//}
break;
case "png":
tSvgObj.Draw().Save(tStream, ImageFormat.Png);
////DELETING SVG FILE
//if (File.Exists(Server.MapPath(null) + ConfigurationManager.AppSettings["EXPORT_TEMP_FOLDER"].ToString() + tSvgOuputFile))
//{
// File.Delete(Server.MapPath(null) + ConfigurationManager.AppSettings["EXPORT_TEMP_FOLDER"].ToString() + tSvgOuputFile);
//}
break;
case "pdf":
PdfWriter tWriter = null;
Document tDocumentPdf = null;
try
{
// First step saving png that would be used in pdf
tSvgObj.Draw().Save(tStream, ImageFormat.Png);
// Creating pdf document
tDocumentPdf = new Document(new iTextSharp.text.Rectangle((float)tSvgObj.Width, (float)tSvgObj.Height));
// setting up margin to full screen image
tDocumentPdf.SetMargins(0.0f, 0.0f, 0.0f, 0.0f);
// creating image
iTextSharp.text.Image tGraph = iTextSharp.text.Image.GetInstance(tStream.ToArray());
tGraph.ScaleToFit((float)tSvgObj.Width, (float)tSvgObj.Height);
tStream = new MemoryStream();
// Insert content
tWriter = PdfWriter.GetInstance(tDocumentPdf, tStream);
tDocumentPdf.Open();
tDocumentPdf.NewPage();
tDocumentPdf.Add(tGraph);
tDocumentPdf.CloseDocument();
//// deleting png
//if (File.Exists(Server.MapPath(null) + ConfigurationManager.AppSettings["EXPORT_TEMP_FOLDER"].ToString() + tOutputFile.Substring(0, tOutputFile.LastIndexOf(".")) + ".png"))
//{
// File.Delete(Server.MapPath(null) + ConfigurationManager.AppSettings["EXPORT_TEMP_FOLDER"].ToString() + tOutputFile.Substring(0, tOutputFile.LastIndexOf(".")) + ".png");
//}
//// deleting svg
//if (File.Exists(Server.MapPath(null) + ConfigurationManager.AppSettings["EXPORT_TEMP_FOLDER"].ToString() + tSvgOuputFile))
//{
// File.Delete(Server.MapPath(null) + ConfigurationManager.AppSettings["EXPORT_TEMP_FOLDER"].ToString() + tSvgOuputFile);
//}
}
catch (Exception ex)
{
throw ex;
}
finally
{
//正确释放资源
tDocumentPdf.Close();
tDocumentPdf.Dispose();
tWriter.Close();
tWriter.Dispose();
tData.Dispose();
tData.Close();
}
break;
case "svg":
tStream = tData;
break;
}
//if (File.Exists(Server.MapPath(null) + ConfigurationManager.AppSettings["EXPORT_TEMP_FOLDER"].ToString() + tOutputFile))
//{
//Putting session to be able to delete file in temp directory
//Session["sFileToTransmit_highcharts_export"] = File.ReadAllBytes(Server.MapPath(null) + ConfigurationManager.AppSettings["EXPORT_TEMP_FOLDER"].ToString() + tOutputFile);
//First step deleting disk file;
//File.Delete(Server.MapPath(null) + ConfigurationManager.AppSettings["EXPORT_TEMP_FOLDER"].ToString() + tOutputFile);
//保存图表路径 可以自己指定
tFileName = Server.MapPath("~/Report/") + tFileName + "." + tExt;
Response.ClearContent();
Response.ClearHeaders();
Response.ContentType = tType;
//Response.AppendHeader("Content-Disposition", "attachment; filename=" + tFileName + "." + tExt + "");
//将二进制流保存为指定路径下的具体文件
System.IO.File.WriteAllBytes(tFileName, tStream.ToArray());
//Response.BinaryWrite(tStream.ToArray());
Response.Write("恭喜您，highcharts导出成功，路径为" + tFileName);
Response.End();
//}
}
}
}
}
}
}
5，这样就可以将图表下载到服务器的Report文件夹中了，ok，不谢！
6。着力推荐关于本文中所解决的问题，让更多的爱好者都能学习到如此经典的方式。本文也是借鉴的。
http://www.stepday.com/topic/?594 http://www.stepday.com/topic/?725
时间： 2024-10-29 19:11:23