使用imgareaselect 輔助後臺進行圖片裁剪
由於項目其中用到圖片裁剪，本來能夠不用到後臺進行裁剪的，可是要兼容萬惡的IE瀏覽器，所以不得不使用後臺進行裁剪。
這次使用到imgareaselect?插件獲取須要裁剪區域的坐標。再由後臺進行裁剪操作。
先上個效果圖再說
可是這裏有一個坑就是上傳的圖片過大，可能會造成裁剪的區域跟插件中顯示的不一樣，所以得如今後臺對雲圖片進行壓縮在裁剪
/**
* 等比例壓縮算法：
* 算法思想：依據壓縮基數和壓縮比來壓縮原圖，生產一張圖片效果最接近原圖的縮略圖
* @param srcURL 原圖地址
* @param deskURL 縮略圖地址
* @param comBase 壓縮基數
* @param scale 壓縮限制(寬/高)比例 一般用1：
* 當scale>=1,縮略圖height=comBase,width按原圖寬高比例;若scale<1,縮略圖width=comBase,height按原圖寬高比例
* @throws Exception
*/
public static void saveMinPhoto(String srcURL, String deskURL, double comBase,
double scale) throws Exception {
File srcFile = new java.io.File(srcURL);
String ext = srcURL.substring(srcURL.lastIndexOf(".") + 1);
Image src = ImageIO.read(srcFile);
int srcHeight = src.getHeight(null);
int srcWidth = src.getWidth(null);
int deskHeight = 0;// 縮略圖高
int deskWidth = 0;// 縮略圖寬
double srcScale = (double) srcHeight / srcWidth;
/**縮略圖寬高算法*/
if ((double) srcHeight > comBase || (double) srcWidth > comBase) {
if (srcScale >= scale || 1 / srcScale > scale) {
if (srcScale >= scale) {
deskHeight = (int) comBase;
deskWidth = srcWidth * deskHeight / srcHeight;
} else {
deskWidth = (int) comBase;
deskHeight = srcHeight * deskWidth / srcWidth;
}
} else {
if ((double) srcHeight > comBase) {
deskHeight = (int) comBase;
deskWidth = srcWidth * deskHeight / srcHeight;
} else {
deskWidth = (int) comBase;
deskHeight = srcHeight * deskWidth / srcWidth;
}
}
} else {
deskHeight = srcHeight;
deskWidth = srcWidth;
}
BufferedImage tag = new BufferedImage(deskWidth, deskHeight, BufferedImage.TYPE_3BYTE_BGR);
tag.getGraphics().drawImage(src, 0, 0, deskWidth, deskHeight, null); //繪制縮小後的圖
FileOutputStream deskImage = new FileOutputStream(deskURL); //輸出到文件流
ImageIO.write(tag, ext, new File(deskURL));
deskImage.close();
}這就是壓縮之後在進行裁剪了。好了上完整代碼先
<!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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>上傳頭像</title>
<link rel="stylesheet" href="../../statics/css/ewt/style_1.css" type="text/css">
<link rel="stylesheet" href="../../statics/css/ewt/style_shangchuangtouxiang.css">
<link rel="stylesheet" type="text/css" href="../../statics/css/ewt/imgareaselect-default.css">
<link rel="stylesheet" href="../../statics/css/ewt/style.css" type="text/css" />
<link rel="stylesheet" href="../../statics/scripts/layer/skin/default/layer.css">
<script src="//cdn.bootcss.com/jquery/1.11.3/jquery.min.js"></script>
<script src="../../statics/scripts/include.js"></script>
<script src="../../statics/scripts/template.js"></script>
<script src="../../statics/scripts/layer/layer.js"></script>
<script src="../../statics/scripts/cropbox.js"></script>
<script src="../../statics/scripts/jquery.imgareaselect.pack.js"></script>
<script src="../../statics/scripts/ajaxfileupload.js"></script>
<script src="../../ewt/user/scripts/shangchuangtouxiang.js"></script>
<script src="../../ewt/common/config.js"></script>
</head>
<body>
<include src="../common/user_head.html"></include>
<div class="bggg">
<div class="box">
<div class="bos">
<include src="../common/user_menu.html"></include>
<div class="bos_r">
<div class="biaoti">
<h3>上傳頭像</h3>
</div>
<div style=" width:915px; height: 400; display: block; overflow: hidden; margin: 30px auto; ">
<div style=" width:430px; margin:0 auto;">
<div class="frame" style="margin: 0 0.3em; width: 300px; height: 300px; float: left;">
<img id="photo" src="" style="width: 300px; height: 300px;"/>
</div>
<div id="preview" style="width: 100px; height: 100px; overflow: hidden; float: left;">
<img src="" style="width: 100px; height: 100px;" id="smallImage"/>
</div>
</div>
</div>
<div style=" width:425px; margin:30px auto;">
<div class="input_XZ1">
<div class="input_XZ">選擇圖片</div>
<input id="uplodimage" class="input_style" name="uplodimage" type="file" onchange="uplodImage(this)">
</div>
<input id="imgUrl" type="hidden">
<input type="button" value="上傳" class="input_SC" onclick="upold();">
</div>
<input type="hidden" id="x1" value="" />
<input type="hidden" id="y1" value="" />
<input type="hidden" id="x2" value="" />
<input type="hidden" id="y2" value="" />
<input type="hidden" id="w" value="" />
<input type="hidden" id="h" value="" />
</div>
</div>
</div>
</div>
<include src="../common/user_footer.html"></include>
</body>
</html>
js 代碼
function preview(img, selection) {
if (!selection.width || !selection.height)
return;
var scaleX = 100 / selection.width;
var scaleY = 100 / selection.height;
$(‘#preview img‘).css({
width: Math.round(scaleX * 300),
height: Math.round(scaleY * 300),
marginLeft: -Math.round(scaleX * selection.x1),
marginTop: -Math.round(scaleY * selection.y1)
});
$(‘#x1‘).val(selection.x1);
$(‘#y1‘).val(selection.y1);
$(‘#x2‘).val(selection.x2);
$(‘#y2‘).val(selection.y2);
$(‘#w‘).val(selection.width);
$(‘#h‘).val(selection.height);
}
$(function () {
});
//上傳原始圖片
function uplodImage(target) {
if(checkImage(target)){
var url = httpUtils.rootPath+‘/component/upload.do‘;
$.ajaxFileUpload({
url: url, //用於文件上傳的服務器端請求地址
secureuri: false, //是否須要安全協議，一般設置為false
fileElementId: ‘uplodimage‘, //文件上傳域的ID
dataType: ‘json‘, //返回值類型 一般設置為json
success: function (data) //服務器成功響應處理函數
{
var filePath = data.filePath;
$(‘#photo‘).attr(‘src‘,httpUtils.rootPath+‘/component/upload.do?action=download&filepath=‘+filePath);
$(‘#smallImage‘).attr(‘src‘,httpUtils.rootPath+‘/component/upload.do? action=download&filepath=‘+filePath);
$(‘#imgUrl‘).val(filePath);
$(‘#photo‘).imgAreaSelect({
aspectRatio: ‘1:1‘,
x1: 50, y1: 50, x2: 241, y2: 241,
handles: true,
fadeSpeed: 200,
onSelectChange: preview
});
$(‘#x1‘).val("50");
$(‘#y1‘).val("50");
$(‘#x2‘).val("241");
$(‘#y2‘).val("241");
$(‘#w‘).val("191");
$(‘#h‘).val("191");
}
});
}
}
//上傳裁剪後的圖片
function upold() {
if($(‘#imgUrl‘).val()==‘‘){
layer.alert("請先選擇圖片在上傳");
return false;
}
$.ajax({
type: "post",
url:httpUtils.rootPath+‘/user/setHeadPicture‘,
beforeSend: function(request) {
request.setRequestHeader("jmtcp", header);
},
async:false,
data: {
x:$(‘#x1‘).val(),
y:$(‘#y1‘).val(),
width: $(‘#w‘).val(),
imgUrl : $(‘#imgUrl‘).val(),
heigth: $(‘#h‘).val()
},
dataType: "json",
success: function(data){
if(data.code==1){
layer.alert(data.message,function(){
window.location.href = ‘../user/grzy.html‘;
});
}else{
layer.alert(data.message);
}
}
});
}
function checkImage(target) {
var isIE = /msie/i.test(navigator.userAgent) && !window.opera;
var fileSize = 0;
var filepath = target.value;
// 為了避免轉義反斜杠出問題。這裏將對其進行轉換
var re = /(\+)/g;
var filename = filepath.replace(re, "#");
// 對路徑字符串進行剪切截取
var one = filename.split("#");
// 獲取數組中最後一個，即文件名稱
var two = one[one.length - 1];
// 再對文件名稱進行截取，以取得後綴名
var three = two.split(".");
// 獲取截取的最後一個字符串，即為後綴名
var last = three[three.length - 1];
// 加入須要推斷的後綴名類型
var tp = "jpg,gif,bmp,JPG,GIF,BMP,png";
// 返回符合條件的後綴名在字符串中的位置
var rs = tp.indexOf(last);
// 假設返回的結果大於或等於0。說明包括同意上傳的文件類型
if(rs < 0){
layer.alert(‘您選擇的上傳文件不是有效的圖片文件‘);
return false;
}
// if (isIE && !target.files) { // IE瀏覽器
// var filePath = target.value; // 獲得上傳文件的絕對路徑
// var fileSystem = new ActiveXObject("Scripting.FileSystemObject");
// // GetFile(path) 方法從磁盤獲取一個文件並返回。
// var file = fileSystem.GetFile(filePath);
// fileSize = file.Size; // 文件大小。單位：b
// }
// else { // 非IE瀏覽器
// fileSize = target.files[0].size;
// }
var img1 = document.getElementById(‘photo‘);
//img1.dynsrc=target.value;
//img1.fileSize：IE ， fileObj.files[0].fileSize：chrome， fileObj.files[0].size：FF
var fileSize = img1.fileSize || target.files[0].fileSize || target.files[0].size;
var size = fileSize / 1024 / 1024;
if (size > 5) {
layer.alert("圖片不能大於5M");
return false;
}
return true;
}
後臺代碼
public class CutImageUtils {
public static SecureRandom rnd = new SecureRandom();
public static String cutImage(int x, int y, int width, int height,String srcPath) throws Exception{
String root = ApplicationContext.getProperty("upload_folder");
String imagePath = root+srcPath;
FileInputStream is = null;
ImageInputStream iis = null;
String uploadFolder = null ;
String filepath = null ;
String serverName = null ;
uploadFolder = ApplicationContext.getProperties().getProperty("upload_folder").toString() ;
filepath = generateServerFolder() ;
serverName = generateServerName(srcPath) ;
File file = new File(uploadFolder + filepath);
if (!file.exists()) {
file.mkdirs();
}
try {
// 讀取圖片文件
saveMinPhoto(imagePath, imagePath, 300, 0.9d);
//resetsize(imagePath, imagePath);
is = new FileInputStream(imagePath);
String ext = srcPath.substring(srcPath.lastIndexOf(".") + 1);
Iterator<ImageReader> it = ImageIO.getImageReadersByFormatName(ext);
ImageReader reader = it.next();
// 獲取圖片流
iis = ImageIO.createImageInputStream(is);
reader.setInput(iis, true);
ImageReadParam param = reader.getDefaultReadParam();
/**
*
* 圖片裁剪區域。Rectangle 指定了坐標空間中的一個區域。通過 Rectangle 對象
*
* 的左上頂點的坐標(x，y)、寬度和高度能夠定義這個區域。
*/
Rectangle rect = new Rectangle(x, y, width, height);
// 提供一個 BufferedImage。將其用作解碼像素數據的目標。
param.setSourceRegion(rect);
BufferedImage bi = reader.read(0, param);
// 保存新圖片
ImageIO.write(bi, ext, new File(uploadFolder + filepath + serverName));
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
if (is != null)
is.close();
if (iis != null)
iis.close();
e.printStackTrace();
}
return filepath + serverName ;
}
/**
*
* @param config
* @param file
* @param request
* @return
*/
public static String generateServerName(String clientPath) {
//按當前時間的分鐘毫秒+3位隨機數
Calendar c = Calendar.getInstance();
String min = get(c,Calendar.MINUTE);
String sec = get(c,Calendar.SECOND);
String mis = get(c,Calendar.MILLISECOND);
String rnd = random();
String ext = getFileExt(getClientName(clientPath));
return min + sec + mis + rnd + ext ;
}
/** 客戶端文件名稱 */
public static String getClientName(String clientPath) {
if(null != clientPath){
int index1 = clientPath.lastIndexOf("/");
int index2 = clientPath.lastIndexOf("\\");
if(index2 > index1){
index1 = index2;
}
return clientPath.substring(index1+1,clientPath.length());
}
return null;
}
public static String getFileExt(String fileName){
if(null != fileName){
int dot = fileName.lastIndexOf(".");
if(dot >= 0){
return fileName.substring(dot);
}
}
return "";
}
public static String random(){
String value = String.valueOf(rnd.nextInt(1000));
if(value.length() < 3){
for(int i=value.length();i<3;i++){
value = "0" + value;
}
}
return value;
}
public static String generateServerFolder() {
//按當前年月日和小時生成文件路徑
Calendar c = Calendar.getInstance();
String year = get(c,Calendar.YEAR);
String mon = get(c,Calendar.MONTH);
String day = get(c,Calendar.DAY_OF_MONTH);
String hour = get(c,Calendar.HOUR_OF_DAY);
return year + "/" + mon + "/" + day + "/" + hour + "/";
}
public static String get(Calendar c,int field){
int v = c.get(field);
if(field == Calendar.MONTH){
v += 1;
}
String value = String.valueOf(v);
if(value.length() == 1){
value = "0" + value;
}
return value;
}
/**
* 縮小圖片到固定長高
* @param srcImagePath 讀取圖片路徑
* @param toImagePath 寫入圖片路徑
* @param width 縮小後圖片寬度
* @param height 縮小後圖片長度
* @throws IOException
*/
public static void reduceImageByWidthHeight(String srcImagePath, String toImagePath, int width, int height) throws IOException{
FileOutputStream out = null;
try{
//讀入文件
File file = new File(srcImagePath);
String ext = srcImagePath.substring(srcImagePath.lastIndexOf(".") + 1);
// 構造Image對象
BufferedImage src = javax.imageio.ImageIO.read(file);
// 縮小邊長
BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
// 繪制縮小後的圖片
tag.getGraphics().drawImage(src, 0, 0, width, height, null);
out = new FileOutputStream(toImagePath);
ImageIO.write(tag, ext, new File(toImagePath));
}catch(Exception e){
e.printStackTrace();
}finally{
if(out != null){
out.close();
}
out = null;
System.gc();
}
}
/**
* 等比例壓縮算法：
* 算法思想：依據壓縮基數和壓縮比來壓縮原圖。生產一張圖片效果最接近原圖的縮略圖
* @param srcURL 原圖地址
* @param deskURL 縮略圖地址
* @param comBase 壓縮基數
* @param scale 壓縮限制(寬/高)比例 一般用1：
* 當scale>=1,縮略圖height=comBase,width按原圖寬高比例;若scale<1,縮略圖width=comBase,height按原圖寬高比例
* @throws Exception
*/
public static void saveMinPhoto(String srcURL, String deskURL, double comBase,
double scale) throws Exception {
File srcFile = new java.io.File(srcURL);
String ext = srcURL.substring(srcURL.lastIndexOf(".") + 1);
Image src = ImageIO.read(srcFile);
int srcHeight = src.getHeight(null);
int srcWidth = src.getWidth(null);
int deskHeight = 0;// 縮略圖高
int deskWidth = 0;// 縮略圖寬
double srcScale = (double) srcHeight / srcWidth;
/**縮略圖寬高算法*/
if ((double) srcHeight > comBase || (double) srcWidth > comBase) {
if (srcScale >= scale || 1 / srcScale > scale) {
if (srcScale >= scale) {
deskHeight = (int) comBase;
deskWidth = srcWidth * deskHeight / srcHeight;
} else {
deskWidth = (int) comBase;
deskHeight = srcHeight * deskWidth / srcWidth;
}
} else {
if ((double) srcHeight > comBase) {
deskHeight = (int) comBase;
deskWidth = srcWidth * deskHeight / srcHeight;
} else {
deskWidth = (int) comBase;
deskHeight = srcHeight * deskWidth / srcWidth;
}
}
} else {
deskHeight = srcHeight;
deskWidth = srcWidth;
}
BufferedImage tag = new BufferedImage(deskWidth, deskHeight, BufferedImage.TYPE_3BYTE_BGR);
tag.getGraphics().drawImage(src, 0, 0, deskWidth, deskHeight, null); //繪制縮小後的圖
FileOutputStream deskImage = new FileOutputStream(deskURL); //輸出到文件流
ImageIO.write(tag, ext, new File(deskURL));
deskImage.close();
}
public static void main(String[] args) {
try {
String src = CutImageUtils.cutImage(11, 12, 100, 100, "2017/01/04/17/6348162d-5b50-4e7d-b414-93140498f8de.jpg");
System.out.println(src);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
使用imgareaselect 輔助後臺進行圖片裁剪