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<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
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<%
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String path = request.getContextPath();
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String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
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%>
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<base href="<%=basePath%>">
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<title>My JSP 'cc.jsp' starting page</title>
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<meta http-equiv="pragma" content="no-cache">
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<meta http-equiv="cache-control" content="no-cache">
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<meta http-equiv="expires" content="0">
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<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
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<meta http-equiv="description" content="This is my page">
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<!--
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<link rel="stylesheet" type="text/css" href="styles.css">
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-->
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<style type="text/css">
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.float{
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float:left;
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width : 200px;
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height: 200px;
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overflow: hidden;
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border: 1px solid #CCCCCC;
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border-radius: 10px;
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padding: 5px;
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margin: 5px;
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}
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img{
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position: relative;
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}
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.result{
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width: 200px;
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height: 200px;
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text-align: center;
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box-sizing: border-box;
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}
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#file_input{
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display: none;
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}
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.delete{
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width: 200px;
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height:200px;
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position: absolute;
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text-align: center;
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line-height: 200px;
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z-index: 10;
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font-size: 30px;
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background-color: rgba(255,255,255,0.8);
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color: #777;
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opacity: 0;
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transition-duration: 0.7s;
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-webkit-transition-duration: 0.7s;
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}
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.delete:hover{
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cursor: pointer;
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opacity: 1;
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}
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</style>
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<script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script>
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<script type="text/javascript">
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window.onload = function(){
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var input = document.getElementById("file_input");
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var result;
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var dataArr = []; // 储存所选图片的结果(文件名和base64数据)
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var fd; //FormData方式发送请求
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var oSelect = document.getElementById("select");
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var oAdd = document.getElementById("add");
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var oSubmit = document.getElementById("submit");
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var oInput = document.getElementById("file_input");
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if(typeof FileReader==='undefined'){
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alert("抱歉，你的浏览器不支持 FileReader");
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input.setAttribute('disabled','disabled');
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}else{
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input.addEventListener('change',readFile,false);
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}
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//handler
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function readFile(){
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fd = new FormData();
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var iLen = this.files.length;
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for(var i=0;i<iLen;i++){
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if (!input['value'].match(/.jpg|.gif|.png|.jpeg|.bmp/i)){//判断上传文件格式
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return alert("上传的图片格式不正确，请重新选择");
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}
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var reader = new FileReader();
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fd.append(i,this.files[i]);
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reader.readAsDataURL(this.files[i]); //转成base64
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reader.fileName = this.files[i].name;
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reader.onload = function(e){
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var imgMsg = {
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name : this.fileName,//获取文件名
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base64 : this.result //reader.readAsDataURL方法执行完后，base64数据储存在reader.result里
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}
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dataArr.push(imgMsg);
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result = '<div class="delete">delete</div><div class="result"><img class="subPic" src="'+this.result+'" alt="'+this.fileName+'"/></div>';
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var div = document.createElement('div');
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div.innerHTML = result;
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div['className'] = 'float';
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document.getElementsByTagName('body')[0].appendChild(div); //插入dom树
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var img = div.getElementsByTagName('img')[0];
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img.onload = function(){
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var nowHeight = ReSizePic(this); //设置图片大小
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this.parentNode.style.display = 'block';
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var oParent = this.parentNode;
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if(nowHeight){
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oParent.style.paddingTop = (oParent.offsetHeight - nowHeight)/2 + 'px';
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}
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}
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div.onclick = function(){
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$(this).remove(); // 在页面中删除该图片元素
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}
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}
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}
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}
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function send(){
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var submitArr = [];
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$('.subPic').each(function () {
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submitArr.push({
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name: $(this).attr('alt'),
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base64: $(this).attr('src')
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});
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}
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);
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$.ajax({
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url : 'http://123.206.89.242:9999',
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type : 'post',
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data : JSON.stringify(submitArr),
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dataType: 'json',
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//processData: false, 用FormData传fd时需有这两项
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//contentType: false,
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success : function(data){
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console.log('返回的数据：'+JSON.stringify(data))
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}
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})
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}
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oSelect.onclick=function(){
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oInput.value = ""; // 先将oInput值清空，否则选择图片与上次相同时change事件不会触发
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//清空已选图片
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$('.float').remove();
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oInput.click();
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}
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oAdd.onclick=function(){
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oInput.value = ""; // 先将oInput值清空，否则选择图片与上次相同时change事件不会触发
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oInput.click();
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}
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oSubmit.onclick=function(){
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if(!dataArr.length){
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return alert('请先选择文件');
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}
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send();
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}
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}
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/*
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用ajax发送fd参数时要告诉jQuery不要去处理发送的数据，
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不要去设置Content-Type请求头才可以发送成功，否则会报“Illegal invocation”的错误，
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也就是非法调用，所以要加上“processData: false,contentType: false,”
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* */
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function ReSizePic(ThisPic) {
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var RePicWidth = 200; //这里修改为您想显示的宽度值
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var TrueWidth = ThisPic.width; //图片实际宽度
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var TrueHeight = ThisPic.height; //图片实际高度
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if(TrueWidth>TrueHeight){
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//宽大于高
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var reWidth = RePicWidth;
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ThisPic.width = reWidth;
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//垂直居中
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var nowHeight = TrueHeight * (reWidth/TrueWidth);
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return nowHeight; //将图片修改后的高度返回，供垂直居中用
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}else{
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//宽小于高
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var reHeight = RePicWidth;
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ThisPic.height = reHeight;
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}
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}
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</script>
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</head>
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<body>
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<div class="container">
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<label>请选择一个图像文件：</label>
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<button id="select">(重新)选择图片</button>
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<button id="add">(追加)图片</button>
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<input type="file" id="file_input" multiple/> <!--用input标签并选择type=file，记得带上multiple，不然就只能单选图片了-->
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<button id="submit">提交</button>
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</div>
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</body>
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</html>
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