html2canvas 上传图片至服务器（java）

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功能：对于一些页面的聊天类，将聊天记录截图发送至服务器端。

用到的js框架：

imgareaselect

http://odyniec.net/projects/imgareaselect/

html2canvas

http://html2canvas.hertzen.com/

利用ImageAreaSelect插件截图，利用html2cancas将截图内容生成cancas并上传至服务器

界面截图：

前端js脚本

$(function(){
				var _width = 0;
				var _height = 0;
				var _borderCss;
				
				function imageCutCancel(){
					alert(_borderCss)
					
				}
				
				$("#btnCut").on('click', function(){
					_borderCss = $('#photo01').get(0).style.border;
					$('#photo01').css('border', '1px solid #FF0000').imgAreaSelect({
				        handles: true,
				        onSelectEnd: function (img, selection) {
					        _width = selection.width;
					        _height = selection.height;
					        $('input[name="x1"]').val(selection.x1);
							$('input[name="y1"]').val(selection.y1);
							$('input[name="x2"]').val(selection.x2);
							$('input[name="y2"]').val(selection.y2);
					    }
				    });
				    
				    
				});
				
				
				$("#btnCancel").on('click', function(){
					_width = 0;
					_height = 0;
					$('#photo01').css('border', _borderCss).imgAreaSelect({remove: true});
				});
				
				$("#btnOk").on('click', function(){
					if (_width<10 && _height<10) return false;
					
					html2canvas($('div#photo01'), {
						onrendered: function(canvas) {
							var imgCxt = canvas.toDataURL();
							
							$.post('${pageContext.request.contextPath}/image/upload.do', {"data":imgCxt}, function(json){
								alert(json.msg);
							}, 'json');
							
							document.body.appendChild(canvas);
						},
						width: _width,
						height: _height
					});
					
					$("#btnCancel").click();
				});
			});

@Controller
@RequestMapping("/image")
public class ImageController{

	@RequestMapping("/upload")
	public void uplod(HttpServletRequest request, HttpServletResponse response){
		String data = request.getParameter("data");
		
		int result = 1;
		String msg = "上传成功";
		
		
		Base64 base64 = new Base64();
		//base64 decode image
		byte[] b = base64.decode(data.substring("data:image/png;base64,".length()).getBytes());
		String fileName = String.valueOf(System.currentTimeMillis());
		//image path
		String filePath = System.getProperty("zokee.root") + File.separator + "DATAS" + File.separator + fileName + ".png";
		//write image
		File file = new File(filePath);
		try {
			FileUtils.writeByteArrayToFile(file, b);
		} catch (IOException e) {
			result = 0;
			msg = "上传失败";
			e.printStackTrace();
		}
		
		JSONObject json = new JSONObject();
		json.accumulate("result", result);
		json.accumulate("msg", msg);
		
		response.setContentType("text/json");
		response.setCharacterEncoding("utf-8");
		try {
			PrintWriter out = response.getWriter();
			out.print(json.toString());
		} catch (IOException e) {
			e.printStackTrace();
		}
		
	}
}

html2canvas 上传图片至服务器（java）

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原文地址：http://blog.csdn.net/xhzq1986/article/details/44488363