在jsp中，可以使用jsp通过servlet中的代码读取数据库数据。
下面给出了jstl读取数据库数据并使用JavaScript画出饼图方法的jsp代码。
首先在该类的Servlet中加入如下方法：
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public String tree(HttpServletRequest request,HttpServletResponse response) throws IOException,ServletException{ File file=CommonUtils.toBean(request.getParameterMap(),File.class); encoding(file); //处理GET请求方式编码问题 int pageNum=getPageNum(request); int Record=999999; pageBean<File> pb=fileService.query(file,pageNum,Record); //获取路径url，保存到pb中 pb.setUrl(getUrl(request)); request.setAttribute("pb",pb); return "/controller.jsp"; } } |
另外对应的controller.jsp页面如下：
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<%@ page contentType="text/html;charset=UTF-8" language="java" pageEncoding="UTF-8" %> <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> <html> <head> <title>客户列表</title> <script type="text/javascript" src="<%= request.getContextPath()%>/plugin/layui/layui.all.js"></script> <link rel="stylesheet" href="<%= request.getContextPath()%>/plugin/layui/css/layui.css"> <script src="jquery-1.4.4.min.js"></script> <!--[if IE]> <script src="http://explorercanvas.googlecode.com/svn/trunk/excanvas.js"></script> <![endif]--> <script> // Run the code when the DOM is ready $( pieChart ); function pieChart() { // Config settings var chartSizePercent = 55; // The chart radius relative to the canvas width/height (in percent) var sliceBorderWidth = 1; // Width (in pixels) of the border around each slice var sliceBorderStyle = "#fff"; // Colour of the border around each slice var sliceGradientColour = "#ddd"; // Colour to use for one end of the chart gradient var maxPullOutDistance = 25; // How far, in pixels, to pull slices out when clicked var pullOutFrameStep = 4; // How many pixels to move a slice with each animation frame var pullOutFrameInterval = 40; // How long (in ms) between each animation frame var pullOutLabelPadding = 65; // Padding between pulled-out slice and its label var pullOutLabelFont = "bold 16px 'Trebuchet MS', Verdana, sans-serif"; // Pull-out slice label font var pullOutValueFont = "bold 12px 'Trebuchet MS', Verdana, sans-serif"; // Pull-out slice value font var pullOutValuePrefix = "$"; // Pull-out slice value prefix var pullOutShadowColour = "rgba( 0, 0, 0, .5 )"; // Colour to use for the pull-out slice shadow var pullOutShadowOffsetX = 5; // X-offset (in pixels) of the pull-out slice shadow var pullOutShadowOffsetY = 5; // Y-offset (in pixels) of the pull-out slice shadow var pullOutShadowBlur = 5; // How much to blur the pull-out slice shadow var pullOutBorderWidth = 2; // Width (in pixels) of the pull-out slice border var pullOutBorderStyle = "#333"; // Colour of the pull-out slice border var chartStartAngle = -.5 * Math.PI; // Start the chart at 12 o'clock instead of 3 o'clock // Declare some variables for the chart var canvas; // The canvas element in the page var currentPullOutSlice = -1; // The slice currently pulled out (-1 = no slice) var currentPullOutDistance = 0; // How many pixels the pulled-out slice is currently pulled out in the animation var animationId = 0; // Tracks the interval ID for the animation created by setInterval() var chartData = []; // Chart data (labels, values, and angles) var chartColours = []; // Chart colours (pulled from the HTML table) var totalValue = 0; // Total of all the values in the chart var canvasWidth; // Width of the canvas, in pixels var canvasHeight; // Height of the canvas, in pixels var centreX; // X-coordinate of centre of the canvas/chart var centreY; // Y-coordinate of centre of the canvas/chart var chartRadius; // Radius of the pie chart, in pixels // Set things up and draw the chart init(); /** * Set up the chart data and colours, as well as the chart and table click handlers, * and draw the initial pie chart */ function init() { // Get the canvas element in the page canvas = document.getElementById('chart'); // Exit if the browser isn't canvas-capable if ( typeof canvas.getContext === 'undefined' ) return; // Initialise some properties of the canvas and chart canvasWidth = canvas.width; canvasHeight = canvas.height; centreX = canvasWidth / 2; centreY = canvasHeight / 2; chartRadius = Math.min( canvasWidth, canvasHeight ) / 2 * ( chartSizePercent / 100 ); // Grab the data from the table, // and assign click handlers to the table data cells var currentRow = -1; var currentCell = 0; $('#chartData td').each( function() { currentCell++; if ( currentCell % 2 != 0 ) { currentRow++; chartData[currentRow] = []; chartData[currentRow]['label'] = $(this).text(); } else { var value = parseFloat($(this).text()); totalValue += value; value = value.toFixed(2); chartData[currentRow]['value'] = value; } // Store the slice index in this cell, and attach a click handler to it $(this).data( 'slice', currentRow ); $(this).click( handleTableClick ); // Extract and store the cell colour if ( rgb = $(this).css('color').match( /rgb\((\d+), (\d+), (\d+)/) ) { chartColours[currentRow] = [ rgb[1], rgb[2], rgb[3] ]; } else if ( hex = $(this).css('color').match(/#([a-fA-F0-9]{2})([a-fA-F0-9]{2})([a-fA-F0-9]{2})/) ) { chartColours[currentRow] = [ parseInt(hex[1],16) ,parseInt(hex[2],16), parseInt(hex[3], 16) ]; } else { alert( "Error: Colour could not be determined! Please specify table colours using the format '#xxxxxx'" ); return; } } ); // Now compute and store the start and end angles of each slice in the chart data var currentPos = 0; // The current position of the slice in the pie (from 0 to 1) for ( var slice in chartData ) { chartData[slice]['startAngle'] = 2 * Math.PI * currentPos; chartData[slice]['endAngle'] = 2 * Math.PI * ( currentPos + ( chartData[slice]['value'] / totalValue ) ); currentPos += chartData[slice]['value'] / totalValue; } // All ready! Now draw the pie chart, and add the click handler to it drawChart(); $('#chart').click ( handleChartClick ); } /** * Process mouse clicks in the chart area. * * If a slice was clicked, toggle it in or out. * If the user clicked outside the pie, push any slices back in. * * @param Event The click event */ function handleChartClick ( clickEvent ) { // Get the mouse cursor position at the time of the click, relative to the canvas var mouseX = clickEvent.pageX - this.offsetLeft; var mouseY = clickEvent.pageY - this.offsetTop; // Was the click inside the pie chart? var xFromCentre = mouseX - centreX; var yFromCentre = mouseY - centreY; var distanceFromCentre = Math.sqrt( Math.pow( Math.abs( xFromCentre ), 2 ) + Math.pow( Math.abs( yFromCentre ), 2 ) ); if ( distanceFromCentre <= chartRadius ) { // Yes, the click was inside the chart. // Find the slice that was clicked by comparing angles relative to the chart centre. var clickAngle = Math.atan2( yFromCentre, xFromCentre ) - chartStartAngle; if ( clickAngle < 0 ) clickAngle = 2 * Math.PI + clickAngle; for ( var slice in chartData ) { if ( clickAngle >= chartData[slice]['startAngle'] && clickAngle <= chartData[slice]['endAngle'] ) { // Slice found. Pull it out or push it in, as required. toggleSlice ( slice ); return; } } } // User must have clicked outside the pie. Push any pulled-out slice back in. pushIn(); } /** * Process mouse clicks in the table area. * * Retrieve the slice number from the jQuery data stored in the * clicked table cell, then toggle the slice * * @param Event The click event */ function handleTableClick ( clickEvent ) { var slice = $(this).data('slice'); toggleSlice ( slice ); } /** * Push a slice in or out. * * If it's already pulled out, push it in. Otherwise, pull it out. * * @param Number The slice index (between 0 and the number of slices - 1) */ function toggleSlice ( slice ) { if ( slice == currentPullOutSlice ) { pushIn(); } else { startPullOut ( slice ); } } /** * Start pulling a slice out from the pie. * * @param Number The slice index (between 0 and the number of slices - 1) */ function startPullOut ( slice ) { // Exit if we're already pulling out this slice if ( currentPullOutSlice == slice ) return; // Record the slice that we're pulling out, clear any previous animation, then start the animation currentPullOutSlice = slice; currentPullOutDistance = 0; clearInterval( animationId ); animationId = setInterval( function() { animatePullOut( slice ); }, pullOutFrameInterval ); // Highlight the corresponding row in the key table $('#chartData td').removeClass('highlight'); var labelCell = $('#chartData td:eq(' + (slice*2) + ')'); var valueCell = $('#chartData td:eq(' + (slice*2+1) + ')'); labelCell.addClass('highlight'); valueCell.addClass('highlight'); } /** * Draw a frame of the pull-out animation. * * @param Number The index of the slice being pulled out */ function animatePullOut ( slice ) { // Pull the slice out some more currentPullOutDistance += pullOutFrameStep; // If we've pulled it right out, stop animating if ( currentPullOutDistance >= maxPullOutDistance ) { clearInterval( animationId ); return; } // Draw the frame drawChart(); } /** * Push any pulled-out slice back in. * * Resets the animation variables and redraws the chart. * Also un-highlights all rows in the table. */ function pushIn() { currentPullOutSlice = -1; currentPullOutDistance = 0; clearInterval( animationId ); drawChart(); $('#chartData td').removeClass('highlight'); } /** * Draw the chart. * * Loop through each slice of the pie, and draw it. */ function drawChart() { // Get a drawing context var context = canvas.getContext('2d'); // Clear the canvas, ready for the new frame context.clearRect ( 0, 0, canvasWidth, canvasHeight ); // Draw each slice of the chart, skipping the pull-out slice (if any) for ( var slice in chartData ) { if ( slice != currentPullOutSlice ) drawSlice( context, slice ); } // If there's a pull-out slice in effect, draw it. // (We draw the pull-out slice last so its drop shadow doesn't get painted over.) if ( currentPullOutSlice != -1 ) drawSlice( context, currentPullOutSlice ); } /** * Draw an individual slice in the chart. * * @param Context A canvas context to draw on * @param Number The index of the slice to draw */ function drawSlice ( context, slice ) { // Compute the adjusted start and end angles for the slice var startAngle = chartData[slice]['startAngle'] + chartStartAngle; var endAngle = chartData[slice]['endAngle'] + chartStartAngle; if ( slice == currentPullOutSlice ) { // We're pulling (or have pulled) this slice out. // Offset it from the pie centre, draw the text label, // and add a drop shadow. var midAngle = (startAngle + endAngle) / 2; var actualPullOutDistance = currentPullOutDistance * easeOut( currentPullOutDistance/maxPullOutDistance, .8 ); startX = centreX + Math.cos(midAngle) * actualPullOutDistance; startY = centreY + Math.sin(midAngle) * actualPullOutDistance; context.fillStyle = 'rgb(' + chartColours[slice].join(',') + ')'; context.textAlign = "center"; context.font = pullOutLabelFont; context.fillText( chartData[slice]['label'], centreX + Math.cos(midAngle) * ( chartRadius + maxPullOutDistance + pullOutLabelPadding ), centreY + Math.sin(midAngle) * ( chartRadius + maxPullOutDistance + pullOutLabelPadding ) ); context.font = pullOutValueFont; context.fillText( pullOutValuePrefix + chartData[slice]['value'] + " (" + ( parseInt( chartData[slice]['value'] / totalValue * 100 + .5 ) ) + "%)", centreX + Math.cos(midAngle) * ( chartRadius + maxPullOutDistance + pullOutLabelPadding ), centreY + Math.sin(midAngle) * ( chartRadius + maxPullOutDistance + pullOutLabelPadding ) + 20 ); context.shadowOffsetX = pullOutShadowOffsetX; context.shadowOffsetY = pullOutShadowOffsetY; context.shadowBlur = pullOutShadowBlur; } else { // This slice isn't pulled out, so draw it from the pie centre startX = centreX; startY = centreY; } // Set up the gradient fill for the slice var sliceGradient = context.createLinearGradient( 0, 0, canvasWidth*.75, canvasHeight*.75 ); sliceGradient.addColorStop( 0, sliceGradientColour ); sliceGradient.addColorStop( 1, 'rgb(' + chartColours[slice].join(',') + ')' ); // Draw the slice context.beginPath(); context.moveTo( startX, startY ); context.arc( startX, startY, chartRadius, startAngle, endAngle, false ); context.lineTo( startX, startY ); context.closePath(); context.fillStyle = sliceGradient; context.shadowColor = ( slice == currentPullOutSlice ) ? pullOutShadowColour : "rgba( 0, 0, 0, 0 )"; context.fill(); context.shadowColor = "rgba( 0, 0, 0, 0 )"; // Style the slice border appropriately if ( slice == currentPullOutSlice ) { context.lineWidth = pullOutBorderWidth; context.strokeStyle = pullOutBorderStyle; } else { context.lineWidth = sliceBorderWidth; context.strokeStyle = sliceBorderStyle; } // Draw the slice border context.stroke(); } /** * Easing function. * * A bit hacky but it seems to work! (Note to self: Re-read my school maths books sometime) * * @param Number The ratio of the current distance travelled to the maximum distance * @param Number The power (higher numbers = more gradual easing) * @return Number The new ratio */ function easeOut( ratio, power ) { return ( Math.pow ( 1 - ratio, power ) + 1 ); } }; </script> <style> .wideBox { clear: both; text-align: center; margin-bottom: 50px; padding: 10px; background: #ebedf2; border: 1px solid #333; line-height: 80%; } #container { width: 900px; margin: 0 auto; } #chart, #chartData { border: 1px solid #333; background: #ebedf2 url("img/gradient.png") repeat-x 0 0; } #chart { display: block; margin: 0 0 50px 0; float: left; cursor: pointer; } #chartData { width: 200px; margin: 0 40px 0 0; float: right; border-collapse: collapse; box-shadow: 0 0 1em rgba(0, 0, 0, 0.5); -moz-box-shadow: 0 0 1em rgba(0, 0, 0, 0.5); -webkit-box-shadow: 0 0 1em rgba(0, 0, 0, 0.5); background-position: 0 -100px; } #chartData th, #chartData td { padding: 0.5em; border: 1px dotted #666; text-align: left; } #chartData th { border-bottom: 2px solid #333; text-transform: uppercase; } #chartData td { cursor: pointer; } #chartData td.highlight { background: #e8e8e8; } #chartData tr:hover td { background: #f0f0f0; } </style> </head> <body> <c:set var="docx" value="0"> </c:set> <c:set var="pptx" value="0"> </c:set> <c:set var="xlsx" value="0"> </c:set> <c:set var="code" value="0"> </c:set> <c:set var="other" value="0"> </c:set> <c:forEach items="${pb.beanList}" var="cstm"> <c:if test="${cstm.category eq 'docx'}"> <c:set var="docx" value="${docx+1}"/> </c:if> <c:if test="${cstm.category eq 'doc'}"> <c:set var="docx" value="${docx+1}"/> </c:if> <c:if test="${cstm.category eq 'txt'}"> <c:set var="docx" value="${docx+1}"/> </c:if> <c:if test="${cstm.category eq 'pptx'}"> <c:set var="pptx" value="${pptx+1}"/> </c:if> <c:if test="${cstm.category eq 'ppt'}"> <c:set var="pptx" value="${pptx+1}"/> </c:if> <c:if test="${cstm.category eq 'xlsx'}"> <c:set var="xlsx" value="${xlsx+1}"/> </c:if> <c:if test="${cstm.category eq 'xls'}"> <c:set var="xlsx" value="${xlsx+1}"/> </c:if> <c:if test="${cstm.category eq 'java'}"> <c:set var="code" value="${code+1}"/> </c:if> <c:if test="${cstm.category eq 'py'}"> <c:set var="code" value="${code+1}"/> </c:if> <c:if test="${cstm.category eq 'cpp'}"> <c:set var="code" value="${code+1}"/> </c:if> <c:if test="${cstm.category eq 'c'}"> <c:set var="code" value="${code+1}"/> </c:if> <c:if test="${cstm.category eq 'exe'}"> <c:set var="other" value="${other+1}"/> </c:if> <c:if test="${cstm.category eq 'mat'}"> <c:set var="other" value="${other+1}"/> </c:if> <c:if test="${cstm.category eq 'm'}"> <c:set var="other" value="${other+1}"/> </c:if> <c:if test="${cstm.category eq 'html'}"> <c:set var="other" value="${other+1}"/> </c:if> </c:forEach> <div id="container"> <br> <br> <canvas id="chart" width="600" height="500"></canvas> <table id="chartData"> <tr> <th>文档类型</th><th>数量</th> </tr> <tr style="color: #0DA068"> <td>文本</td><td>${docx}</td> </tr> <tr style="color: #194E9C"> <td>幻灯片</td><td>${pptx}</td> </tr> <tr style="color: #723d17"> <td>数据表</td><td>${xlsx}</td> </tr> <tr style="color: #973f9c"> <td>代码类</td><td>${code}</td> </tr> <tr style="color: #9c0055"> <td>其它</td><td>${other}</td> </tr> </table> </div> </body> </html> |
效果： 
