实现右键直接粘贴在文本框上，图片上传到服务器并返回一个img的地址，适配IE11、FF、Chrome。这个是前台，用wangEditor测试，用户需引入wangEditor.min.js。 wangEditor demo 欢迎使用 wangEditor 富
wangEditor demo
欢迎使用 wangEditor 富文本编辑器
引入的 paste.js ，在GitHub上看到的一个适配主流浏览器的粘贴图片的轮子。
// 源地址 https://github.com/layerssss/paste.js/
(function() {
var $, Paste, createHiddenEditable, dataURLtoBlob, isFocusable;
$ = window.jQuery;
$.paste = function(pasteContainer) {
var pm;
if (typeof console !== "undefined" && console !== null) {
console.log("DEPRECATED: This method is deprecated. Please use $.fn.pastableNonInputable() instead.");
}
pm = Paste.mountNonInputable(pasteContainer);
return pm._container;
};
$.fn.pastableNonInputable = function() {
var el, j, len, ref;
ref = this;
for (j = 0, len = ref.length; j < len; j++) {
el = ref[j];
if (el._pastable || $(el).is('textarea, input:text, [contenteditable]')) {
continue;
}
Paste.mountNonInputable(el);
el._pastable = true;
}
return this;
};
$.fn.pastableTextarea = function() {
var el, j, len, ref;
ref = this;
for (j = 0, len = ref.length; j < len; j++) {
el = ref[j];
if (el._pastable || $(el).is(':not(textarea, input:text)')) {
continue;
}
Paste.mountTextarea(el);
el._pastable = true;
}
return this;
};
$.fn.pastableContenteditable = function() {
var el, j, len, ref;
ref = this;
for (j = 0, len = ref.length; j < len; j++) {
el = ref[j];
if (el._pastable || $(el).is(':not([contenteditable])')) {
continue;
}
Paste.mountContenteditable(el);
el._pastable = true;
}
return this;
};
dataURLtoBlob = function(dataURL, sliceSize) {
var b64Data, byteArray, byteArrays, byteCharacters, byteNumbers, contentType, i, m, offset, ref, slice;
if (sliceSize == null) {
sliceSize = 512;
}
if (!(m = dataURL.match(/^data\:([^\;]+)\;base64\,(.+)$/))) {
return null;
}
ref = m, m = ref[0], contentType = ref[1], b64Data = ref[2];
byteCharacters = atob(b64Data);
byteArrays = [];
offset = 0;
while (offset < byteCharacters.length) {
slice = byteCharacters.slice(offset, offset + sliceSize);
byteNumbers = new Array(slice.length);
i = 0;
while (i < slice.length) {
byteNumbers[i] = slice.charCodeAt(i);
i++;
}
byteArray = new Uint8Array(byteNumbers);
byteArrays.push(byteArray);
offset += sliceSize;
}
return new Blob(byteArrays, {
type: contentType
});
};
createHiddenEditable = function() {
return $(document.createElement('div')).attr('contenteditable', true).attr('aria-hidden', true).attr('tabindex', -1).css({
width: 1,
height: 1,
position: 'fixed',
left: -100,
overflow: 'hidden'
});
};
isFocusable = function(element, hasTabindex) {
var fieldset, focusableIfVisible, img, map, mapName, nodeName;
map = void 0;
mapName = void 0;
img = void 0;
focusableIfVisible = void 0;
fieldset = void 0;
nodeName = element.nodeName.toLowerCase();
if ('area' === nodeName) {
map = element.parentNode;
mapName = map.name;
if (!element.href || !mapName || map.nodeName.toLowerCase() !== 'map') {
return false;
}
img = $('img[usemap=\'#' + mapName + '\']');
return img.length > 0 && img.is(':visible');
}
if (/^(input|select|textarea|button|object)$/.test(nodeName)) {
focusableIfVisible = !element.disabled;
if (focusableIfVisible) {
fieldset = $(element).closest('fieldset')[0];
if (fieldset) {
focusableIfVisible = !fieldset.disabled;
}
}
} else if ('a' === nodeName) {
focusableIfVisible = element.href || hasTabindex;
} else {
focusableIfVisible = hasTabindex;
}
focusableIfVisible = focusableIfVisible || $(element).is('[contenteditable]');
return focusableIfVisible && $(element).is(':visible');
};
Paste = (function() {
Paste.prototype._target = null;
Paste.prototype._container = null;
Paste.mountNonInputable = function(nonInputable) {
var paste;
paste = new Paste(createHiddenEditable().appendTo(nonInputable), nonInputable);
$(nonInputable).on('click', (function(_this) {
return function(ev) {
if (!isFocusable(ev.target, false)) {
return paste._container.focus();
}
};
})(this));
paste._container.on('focus', (function(_this) {
return function() {
return $(nonInputable).addClass('pastable-focus');
};
})(this));
return paste._container.on('blur', (function(_this) {
return function() {
return $(nonInputable).removeClass('pastable-focus');
};
})(this));
};
Paste.mountTextarea = function(textarea) {
var ctlDown, paste, ref, ref1;
if ((typeof DataTransfer !== "undefined" && DataTransfer !== null ? DataTransfer.prototype : void 0) && ((ref = Object.getOwnPropertyDescriptor) != null ? (ref1 = ref.call(Object, DataTransfer.prototype, 'items')) != null ? ref1.get : void 0 : void 0)) {
return this.mountContenteditable(textarea);
}
paste = new Paste(createHiddenEditable().insertBefore(textarea), textarea);
ctlDown = false;
$(textarea).on('keyup', function(ev) {
var ref2;
if ((ref2 = ev.keyCode) === 17 || ref2 === 224) {
ctlDown = false;
}
return null;
});
$(textarea).on('keydown', function(ev) {
var ref2;
if ((ref2 = ev.keyCode) === 17 || ref2 === 224) {
ctlDown = true;
}
if ((ev.ctrlKey != null) && (ev.metaKey != null)) {
ctlDown = ev.ctrlKey || ev.metaKey;
}
if (ctlDown && ev.keyCode === 86) {
paste._textarea_focus_stolen = true;
paste._container.focus();
paste._paste_event_fired = false;
setTimeout((function(_this) {
return function() {
if (!paste._paste_event_fired) {
$(textarea).focus();
return paste._textarea_focus_stolen = false;
}
};
})(this), 1);
}
return null;
});
$(textarea).on('paste', (function(_this) {
return function() {};
})(this));
$(textarea).on('focus', (function(_this) {
return function() {
if (!paste._textarea_focus_stolen) {
return $(textarea).addClass('pastable-focus');
}
};
})(this));
$(textarea).on('blur', (function(_this) {
return function() {
if (!paste._textarea_focus_stolen) {
return $(textarea).removeClass('pastable-focus');
}
};
})(this));
$(paste._target).on('_pasteCheckContainerDone', (function(_this) {
return function() {
$(textarea).focus();
return paste._textarea_focus_stolen = false;
};
})(this));
return $(paste._target).on('pasteText', (function(_this) {
return function(ev, data) {
var content, curEnd, curStart;
curStart = $(textarea).prop('selectionStart');
curEnd = $(textarea).prop('selectionEnd');
content = $(textarea).val();
$(textarea).val("" + content.slice(0, curStart) + data.text + content.slice(curEnd));
$(textarea)[0].setSelectionRange(curStart + data.text.length, curStart + data.text.length);
return $(textarea).trigger('change');
};
})(this));
};
Paste.mountContenteditable = function(contenteditable) {
var paste;
paste = new Paste(contenteditable, contenteditable);
$(contenteditable).on('focus', (function(_this) {
return function() {
return $(contenteditable).addClass('pastable-focus');
};
})(this));
return $(contenteditable).on('blur', (function(_this) {
return function() {
return $(contenteditable).removeClass('pastable-focus');
};
})(this));
};
function Paste(_container, _target) {
this._container = _container;
this._target = _target;
this._container = $(this._container);
this._target = $(this._target).addClass('pastable');
this._container.on('paste', (function(_this) {
return function(ev) {
var clipboardData, file, item, j, k, len, len1, reader, ref, ref1, ref2, ref3, text;
if (ev.currentTarget !== ev.target) {
return ev.preventDefault();
}
_this._paste_event_fired = true;
if (((ref = ev.originalEvent) != null ? ref.clipboardData : void 0) != null) {
clipboardData = ev.originalEvent.clipboardData;
if (clipboardData.items) {
ref1 = clipboardData.items;
for (j = 0, len = ref1.length; j < len; j++) {
item = ref1[j];
if (item.type.match(/^image\//)) {
reader = new FileReader();
reader.onload = function(event) {
return _this._handleImage(event.target.result);
};
try {
reader.readAsDataURL(item.getAsFile());
} catch (error) {}
ev.preventDefault();
break;
}
if (item.type === 'text/plain') {
item.getAsString(function(string) {
return _this._target.trigger('pasteText', {
text: string
});
});
}
}
} else {
if (-1 !== Array.prototype.indexOf.call(clipboardData.types, 'text/plain')) {
text = clipboardData.getData('Text');
setTimeout(function() {
return _this._target.trigger('pasteText', {
text: text
});
}, 1);
}
_this._checkImagesInContainer(function(src) {
return _this._handleImage(src);
});
}
}
if (clipboardData = window.clipboardData) {
if ((ref2 = (text = clipboardData.getData('Text'))) != null ? ref2.length : void 0) {
setTimeout(function() {
_this._target.trigger('pasteText', {
text: text
});
return _this._target.trigger('_pasteCheckContainerDone');
}, 1);
} else {
ref3 = clipboardData.files;
for (k = 0, len1 = ref3.length; k < len1; k++) {
file = ref3[k];
_this._handleImage(URL.createObjectURL(file));
}
_this._checkImagesInContainer(function(src) {});
}
}
return null;
};
})(this));
}
Paste.prototype._handleImage = function(src) {
var loader;
if (src.match(/^webkit\-fake\-url\:\/\//)) {
return this._target.trigger('pasteImageError', {
message: "You are trying to paste an image in Safari, however we are unable to retieve its data."
});
}
loader = new Image();
loader.crossOrigin = "anonymous";
loader.onload = (function(_this) {
return function() {
var blob, canvas, ctx, dataURL;
canvas = document.createElement('canvas');
canvas.width = loader.width;
canvas.height = loader.height;
ctx = canvas.getContext('2d');
ctx.drawImage(loader, 0, 0, canvas.width, canvas.height);
dataURL = null;
try {
dataURL = canvas.toDataURL('image/png');
blob = dataURLtoBlob(dataURL);
} catch (error) {}
if (dataURL) {
return _this._target.trigger('pasteImage', {
blob: blob,
dataURL: dataURL,
width: loader.width,
height: loader.height
});
}
};
})(this);
loader.onerror = (function(_this) {
return function() {
return _this._target.trigger('pasteImageError', {
message: "Failed to get image from: " + src,
url: src
});
};
})(this);
return loader.src = src;
};
Paste.prototype._checkImagesInContainer = function(cb) {
var img, j, len, ref, timespan;
timespan = Math.floor(1000 * Math.random());
ref = this._container.find('img');
for (j = 0, len = ref.length; j < len; j++) {
img = ref[j];
img["_paste_marked_" + timespan] = true;
}
return setTimeout((function(_this) {
return function() {
var k, len1, ref1;
ref1 = _this._container.find('img');
for (k = 0, len1 = ref1.length; k < len1; k++) {
img = ref1[k];
if (!img["_paste_marked_" + timespan]) {
cb(img.src);
$(img).remove();
}
}
return _this._target.trigger('_pasteCheckContainerDone');
};
})(this), 1);
};
return Paste;
})();
}).call(this);
后端服务器接收并解析的 Servlet
import sun.misc.BASE64Decoder;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.util.Random;
/**
* Created by LXM on 2017-07-20.
*/
public class Servlet extends javax.servlet.http.HttpServlet {
protected void doPost(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) throws javax.servlet.ServletException, IOException {
try {
request.setCharacterEncoding("utf-8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
try {
String data = request.getReader().readLine();
// 处理数据
System.out.println(data);
Random random = new Random();
String path = random.nextInt(10000) + "." + data.split(",")[0].split("image/")[1].split(";")[0];
boolean result = GenerateImage(data.split(",")[1], "F:\\MyJavaWebs\\Server4Upload\\out\\artifacts\\Server4Upload_war_exploded\\RichTextArea\\ImgTmp\\A" + path);
renderData(response, "ImgTmp\\A" + path);
} catch (Exception e) {
e.printStackTrace();
}
}
protected void doGet(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) throws javax.servlet.ServletException, IOException {
}
/**
* base64解码成图片保存
*
* @param imgStr
* @param imgFilePath
* @return
*/
public static boolean GenerateImage(String imgStr, String imgFilePath) {
if (imgStr == null) // 图像数据为空
return false;
BASE64Decoder decoder = new BASE64Decoder();
try {
// Base64解码
byte[] bytes = decoder.decodeBuffer(imgStr);
for (int i = 0; i < bytes.length; ++i) {
if (bytes[i] < 0) {// 调整异常数据
bytes[i] += 256;
}
}
// 生成图片
OutputStream out = new FileOutputStream(imgFilePath);
out.write(bytes);
out.flush();
out.close();
return true;
} catch (Exception e) {
return false;
}
}
/**
* 返回结果
*
* @param response
* @param path
*/
private void renderData(HttpServletResponse response, String path) {
PrintWriter printWriter = null;
try {
response.setHeader("Content-type", "text/html;charset=UTF-8");
printWriter = response.getWriter();
printWriter.print(path);
} catch (IOException ex) {
ex.printStackTrace();
} finally {
if (null != printWriter) {
printWriter.flush();
printWriter.close();
}
}
}
}