html5 图片上传范例详解 -

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html5 图片上传范例详解

html5 java JavaScript

html5 最新的拖拽上传网上的例子也不少，但是本人没看到什么特别全面的，所以特地在这里把前台和后台代码全部贴上，望还没实现的人今早实现。
代码如下：

前台的jsp如下：

<%@ page language="java" pageEncoding="UTF-8"%>
<%@ page isELIgnored="false"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn"%>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort()+ path + "/";
%>
<!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>
<title>我的webQQ</title>
<base href="<%=basePath%>"/>
<script type="text/javascript" src="<%=basePath%>js/jquery-1.6.1.min.js"></script>
<script language="JavaScript" type="text/JavaScript">

$(function(){
if (window.FileReader) {
var file ;
        var list = document.getElementById('list'),
            cnt = document.getElementById('container'),
            btn = document.getElementById("upLoadbtn");

        // 判断是否图片
        function isImage(type) {
            switch (type) {
            case 'image/jpeg':
            case 'image/png':
            case 'image/gif':
            case 'image/bmp':
            case 'image/jpg':
                return true;
            default:
                return false;
            }
        }

function looks(f,img){
list.innerHTML += '<li><strong>' + f.name + '</strong> - ' + f.size + ' bytes<p>' + img + '</p></li>';
            cnt.innerHTML = img;

}

        // 处理拖放文件列表
        function handleFileSelect(evt) {
            evt.stopPropagation();
            evt.preventDefault();

            var files = evt.dataTransfer.files;

            for (var i = 0, f; f = files[i]; i++) {

                var t = f.type ? f.type : 'n/a';
                reader = new FileReader();
isImg = isImage(t);

                // 处理得到的图片
                if (isImg) {
                    reader.onload = (function (theFile) {
                        return function (e) {
                            img = '<img class="preview" src="' + e.target.result + '" title="' + theFile.name + '"/>';
                            looks(theFile, img);
file=theFile;
                        };
                    })(f);
                    reader.readAsDataURL(f);
                } else {
                    img = '"o((>ω< ))o"，你传进来的不是图片！！';
                    looks(f, img);
                }

            }

        }

        // 处理插入拖出效果
        function handleDragEnter(evt){ this.setAttribute('style', 'border-style:dashed;'); }
        function handleDragLeave(evt){ this.setAttribute('style', ''); }

        // 处理文件拖入事件，防止浏览器默认事件带来的重定向
        function handleDragOver(evt) {
            evt.stopPropagation();
            evt.preventDefault();
        }

        cnt.addEventListener('dragenter', handleDragEnter, false);
        cnt.addEventListener('dragover', handleDragOver, false);
        cnt.addEventListener('drop', handleFileSelect, false);
        cnt.addEventListener('dragleave', handleDragLeave, false);


function upload(){

var container = document.getElementById('container');

/**
//获取分割线
var boundary="----------BOUNDARY"+(new Date()).getTime();

//新建文件读取
var fileReader = new FileReader();

//读取文件
fileReader.readAsBinaryString(file);
var fileData = fileReader.result;

//拼接body
var body = '';
body += "--" + boundary + "\r\n";
body += "Content-Disposition: form-data; name=\"image\"; filename=\"" + file.name + "\"\r\n";
body += "Content-Type: "+file.type+"\r\n\r\n";
body += fileData + "\r\n";
body += "--" + boundary + "--\r\n";

//开始异步请求
var xhr = new XMLHttpRequest();
xhr.open('POST', "test/upload.html", true);

xhr.setRequestHeader('content-type', "multipart/form-data, boundary="+boundary);
xhr.setRequestHeader("Content-Length",file.size);
alert(body);
xhr.sendAsBinary(body);

*/

var xhr = new XMLHttpRequest();
xhr.open('post', "test/upload.html", true);
xhr.setRequestHeader("X-Requested-With", "XMLHttpRequest");
var fd = new FormData();
fd.append('name', file.name);
// Add file data
fd.append('file', file);
// Send data
xhr.send(fd);

/**

xhr.onload = function() {
alert("onload");
};
xhr.onerror = function() {
//alert(this.responseText);
};
xhr.upload.onprogress = function(event) {
//alert("onprogress");
};
xhr.upload.onloadstart = function(event) {
//alert("start");
};

// prepare FormData
var formData = new FormData();
formData.append('myfile', file);
xhr.send(formData);
*/

}
btn.addEventListener('click',upload,false);
    } else {
        document.getElementById('section').innerHTML = '你的浏览器不支持啊，同学';
    }

});

</script>
        <style>
            #section{font-family: "Georgia", "微软雅黑", "华文中宋";}
            .container{display:inline-block;min-height:200px;min-width:360px;color:#f30;padding:30px;border:3px solid #ddd;-moz-border-radius:10px;-webkit-border-radius:10px;border-radius:10px;}
            .preview{max-width:360px;}
            #files-list{position:absolute;top:0;left:500px;}
            #list{width:460px;}
            #list .preview{max-width:250px;}
            #list p{color:#888;font-size:12px;}
            #list .green{color:#09c;}
        </style>
</head>
<body>

<div id="section">
            <p>把你的图片拖到下面的容器内：</p>

            <div id="container" class="container">

            </div>
            <div id ="files-list">
                <p>已经拖进过来的文件：</p>
                <ul id="list"></ul>
            </div>
                <input type="button" value = "确认上传" id="upLoadbtn" "/>
        </div>


</body>
</html>

   后台的java代码如下：
        /**
*
* @author 程欣伟
* 图片上传
* @param request
*/
@RequestMapping("upload.html")
public void upload(HttpServletRequest request) {
try {
MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;

//获取文件map信息
Map<String,MultipartFile> fileMap = multipartRequest.getFileMap();

//迭代map
Iterator<Entry<String,MultipartFile>> iterator = fileMap.entrySet().iterator();
while(iterator.hasNext()){
Map.Entry<String,MultipartFile> entry = iterator.next();
//获取文件信息
MultipartFile value   = entry.getValue();
//获取文件大小
Long size = value.getSize();
//获取文件名字
String fileName = value.getOriginalFilename();
//获取后缀名
String houzhuiName = fileName.substring(fileName.lastIndexOf('.')+1,fileName.length());
BufferedOutputStream out = null;
BufferedInputStream in = null;
//获取文件字节数组
byte[] b = value.getBytes();
try {
String filename = UUID.randomUUID().toString(); // 重命名文件
String dir = "d:/image/";
File file = new File(dir);
if(!file.exists()){
file.mkdir();
}
String filepathString = dir+filename+"."+houzhuiName;
//吧字节数组写入
out = new BufferedOutputStream(new FileOutputStream(filepathString, true));
out.write(b, 0, b.length);

} catch (Exception ex) {
// TODO: handle exception
} finally {
if (out != null) {
out.close();
}
if (in != null) {
in.close();
}
}
}
} catch (Exception ex) {
ex.printStackTrace();
}
}

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