发布于 2016-07-14 08:35:27 | 1086 次阅读 | 评论: 0 | 来源: 网友投递

这里有新鲜出炉的精品教程，程序狗速度看过来！

ECharts Javascript免费图表库

ECharts开源来自百度商业前端数据可视化团队，基于html5 Canvas，是一个纯Javascript图表库，提供直观，生动，可交互，可个性化定制的数据可视化图表。创新的拖拽重计算、数据视图、值域漫游等特性大大增强了用户体验，赋予了用户对数据进行挖掘、整合的能力。

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这篇文章主要介绍了echarts图表导出excel示例,需要的朋友可以参考下

根据传入的参数生成相应的图形

loadChart : function(data,item){
  var that = this;
  require(['echarts', 'echarts/chart/bar', 'echarts/chart/line',
    'echarts/chart/pie'], function(ec) {
   that.body.setHeight(800);
   var myChart = ec.init(that.body.dom);
   myChart.showLoading({
    text : "图表数据正在努力加载..."
   });

   
    var option = {
     tooltip : {
      trigger : 'axis',
      axisPointer : { // 坐标轴指示器，坐标轴触发有效
       type : 'shadow' // 默认为直线，可选为：'line' | 'shadow'
      }
     },
     legend : {
      data : data.indis,
      x : 'left',
      y : 'top'
     },
     toolbox : {
      show : true,
      orient : 'vertical',
      x : 'right',
      y : 'center',
      feature : {
       mark : {
        show : true
       },
       dataView : {
        show : true,
        readOnly : true
       },
       magicType : {
        show : true,
        type : ['line', 'bar', 'stack', 'tiled']
       },
       restore : {
        show : true
       },
       saveAsImage : {
        show : true
       }
      }
     },
     calculable : true,
     animation : false,
     xAxis : [{
      type : 'category',
      data : data.grp
     }],
     yAxis : [{
      type : 'value',
      splitArea : {
       show : true
      }
     }],
     series : data.bar.series
    };
   }
   myChart.hideLoading();
   myChart.setOption(option);
   that.imgURL = myChart.getDataURL('png');//获取base64编码
  });

 },
initEChart : function(){
  require.config({
         paths:{
             'echarts':'js/com/bhtec/echart/echarts',
             'echarts/chart/bar' : 'js/com/bhtec/echart/echarts',
             'echarts/chart/line': 'js/com/bhtec/echart/echarts',
             'echarts/chart/pie': 'js/com/bhtec/echart/echarts'
         }
     }); 
 }

将数据传递到后台

doExport : function(){

  var url = this.chartPanel.getImageURL();
  var title = Ext.fly('indi-display-title-id').first().dom.innerHTML;
  var left = Ext.getCmp("indi_pivotGrid_id").leftAxis.getTuples();
  var t = Ext.getCmp("indi_pivotGrid_id").topAxis.getTuples();

  //TODO  获取base64的图片编码
  Ext.Ajax.request({
   url : 'indicator/exp2excl.mvc',
   params : {
    imgURL:url,
    left:getS(left)
   }
  });
  function getS(d){
      var arr = [],str;
      for(var i=0;i<d.length;i++){
          var s = IndiFn.getAxisStr(d[i]);
          arr.push(s);
      }
      str = arr.join(',');
      return str;
  }
  var data = Ext.getCmp("indi_pivotGrid_id").extractData();
  var s,arr=[];
  for(var i=0;i<data.length;i++){
      arr.push(data[i]);
  }

  window.open('indicator/exportList2Excel.mvc?title='+encodeURIComponent(encodeURIComponent(title))+'&left='+encodeURIComponent(encodeURIComponent(getS(left)))+'' +
    '&top='+encodeURIComponent(encodeURIComponent(getS(t)))+'&data='+arr.join(';'));
 }

解析base64，生成图片

public void base64TOpic(String fileName, HttpServletRequest req) {
  //对字节数组字符串进行Base64解码并生成图片
        if (imgsURl == null) //图像数据为空
            return ;
        BASE64Decoder decoder = new BASE64Decoder();
        try 
        {
         String[] url = imgsURl.split(",");
         String u = url[1];
            //Base64解码
         byte[] buffer = new BASE64Decoder().decodeBuffer(u);
            //生成图片
            OutputStream out = new FileOutputStream(new File(req.getRealPath("pic/"+fileName+".jpg")));    
            out.write(buffer);
            out.flush();
            out.close();
            return;
        } 
        catch (Exception e) 
        {
            return;
        }
 }

通过poi画图，将图片放入到excel中

row = sheet.createRow(index+3);
  HSSFCell headerCell = row.createCell(0);    
  headerCell.setCellType(HSSFCell.CELL_TYPE_BLANK);  
  headerCell.setCellValue(title);

  row = sheet.createRow(index + 6);
  HSSFCell cells = row.createCell(0);
  cells.setCellType(HSSFCell.CELL_TYPE_BLANK);
  ByteArrayOutputStream outStream = new ByteArrayOutputStream(); // 将图片写入流中
  BufferedImage bufferImg = ImageIO.read(new File(req.getRealPath("pic/"+fileName+".jpg")));
  ImageIO.write(bufferImg, "PNG", outStream); // 利用HSSFPatriarch将图片写入EXCEL
  HSSFPatriarch patri = sheet.createDrawingPatriarch();
  HSSFClientAnchor anchor = new HSSFClientAnchor(5, 5, 5, 5,
    (short) 1, index + 6, (short) 6, 45);
  patri.createPicture(anchor, workbook.addPicture(
    outStream.toByteArray(), HSSFWorkbook.PICTURE_TYPE_PNG));
  try {
   workbook.write(out);
   out.flush();
   out.close();
  } catch (IOException e) {
   e.printStackTrace();
  }