再分享一個剛學會的小東東：聊天室實現ctrl+v粘貼並上傳圖片，親測有效（目前只能粘貼QQ或者微信的截圖上傳，桌面上的圖片直接復制再粘貼無效，今后再深究），下面上代碼
前端頁面：
<textarea class="scroll" id="text" placeholder="在此輸入..."></textarea>
<script type="text/javascript">
document.querySelector("#text").addEventListener("paste", function(e){
//添加監聽paste事件
var cbd = e.clipboardData;
var ua = window.navigator.userAgent;
if ( !(e.clipboardData && e.clipboardData.items) ) {
return ;
}
if(cbd.items && cbd.items.length === 2 && cbd.items[0].kind === "string" && cbd.items[1].kind === "file" && cbd.types && cbd.types.length === 2 && cbd.types[0] === "text/plain" && cbd.types[1] === "Files" && ua.match(/Macintosh/i) && Number(ua.match(/Chrome\/(\d{2})/i)[1]) < 49){
return;
}
for(var i = 0; i < cbd.items.length; i++) {
var item = cbd.items[i];
if(item.kind == "file"){
var blob = item.getAsFile();
if (blob.size === 0) {
return;
}
var data = new FormData();
data.append("blob", blob);
$.ajax({
url : "/user/uploads",
type : 'POST',
cache : false,
data : data,
processData : false,
contentType : false,
success : function(result){
if(result.state == "1"){
console.log(result.msg)
var html = "<img src='"+result.fileAddress+"' width='200' height='200'>";
$("#text").val(html);
$("#submit").trigger("click"); //模擬點擊按鈕，粘貼之后直接發送
}else if(result.state == "2"){
console.log(result.msg)
}else if(result.state == "3"){
console.log(result.msg)
}
}
});
}
}
}, false)
</script>
后端上傳方法：
@RequestMapping(value="/uploads",produces=MediaType.APPLICATION_JSON_VALUE+";charset=utf-8")
@ResponseBody
public String uploads(@RequestParam(value = "blob", required = false) MultipartFile blob, HttpServletRequest request){
/**
* 入參直接寫MultipartFile blob獲取的參數是null，具體原因不清楚
* 還有一個主意事項就是入參的參數名要和前面傳值的參數名對應上例（blob），否則接收不到參數
*/
JSONObject jsonObject = new JSONObject();
if(!blob.isEmpty()){
if(blob.getSize() >= 5242880){
jsonObject.accumulate("state", "3");
jsonObject.accumulate("msg", "請上傳小於5M的文件！");
}else{
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmsssss");
String id = sdf.format(new Date());
String path = request.getSession().getServletContext().getRealPath("/uploads");
String filename = blob.getOriginalFilename();
String[] endfilename = filename.split("\\.");
String finalname = id + "." + endfilename[endfilename.length-1];
File filepath = new File(path, finalname);
if(!filepath.getParentFile().exists()){
filepath.getParentFile().mkdirs();
}
try {
blob.transferTo(new File(path + File.separator + finalname));
jsonObject.accumulate("state", "1");
jsonObject.accumulate("msg", "上傳成功！");
jsonObject.accumulate("fileAddress", "/uploads/"+finalname);
} catch (Exception e) {
e.printStackTrace();
}
}
}else{
jsonObject.accumulate("state", "2");
}
return JsonUtils.objectToJson(jsonObject);
}
GAME OVER，功能實現~
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