溫馨提示×
您好，登錄后才能下訂單哦！
點(diǎn)擊 登錄注冊(cè) 即表示同意《億速云用戶服務(wù)條款》
您好，登錄后才能下訂單哦！
因?yàn)轫?xiàng)目當(dāng)中用到圖片裁剪，本來(lái)可以不用到后臺(tái)進(jìn)行裁剪的，但是要兼容萬(wàn)惡的IE瀏覽器，所以不得不使用后臺(tái)進(jìn)行裁剪。
這次使用到imgareaselect 插件獲取需要裁剪區(qū)域的坐標(biāo)，再由后臺(tái)進(jìn)行裁剪操作。先上個(gè)效果圖再說(shuō)
但是這里有一個(gè)坑就是上傳的圖片過(guò)大，可能會(huì)造成裁剪的區(qū)域跟插件中顯示的不一樣，所以得現(xiàn)在后臺(tái)對(duì)云圖片進(jìn)行壓縮在裁剪。
/**
* 等比例壓縮算法：
* 算法思想：根據(jù)壓縮基數(shù)和壓縮比來(lái)壓縮原圖，生產(chǎn)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(shù)
* @param scale 壓縮限制(寬/高)比例 一般用1：
* 當(dāng)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); //繪制縮小后的圖
FileOutputStream deskImage = new FileOutputStream(deskURL); //輸出到文件流
ImageIO.write(tag, ext, new File(deskURL));
deskImage.close();
}
這就是壓縮之后在進(jìn)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" rel="external nofollow" type="text/css"> <link rel="stylesheet" href="../../statics/css/ewt/style_shangchuangtouxiang.css" rel="external nofollow" > <link rel="stylesheet" type="text/css" href="../../statics/css/ewt/imgareaselect-default.css" rel="external nofollow" > <link rel="stylesheet" href="../../statics/css/ewt/style.css" rel="external nofollow" type="text/css" /> <link rel="stylesheet" href="../../statics/scripts/layer/skin/default/layer.css" rel="external nofollow" > <script src="http://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"> <h4>上傳頭像</h4> </div> <div > <div > <div class="frame" > <img id="photo" src="" /> </div> <div id="preview" > <img src="" id="smallImage"/> </div> </div> </div> <div > <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, //用于文件上傳的服務(wù)器端請(qǐng)求地址
secureuri: false, //是否需要安全協(xié)議，一般設(shè)置為false
fileElementId: 'uplodimage', //文件上傳域的ID
dataType: 'json', //返回值類型 一般設(shè)置為json
success: function (data) //服務(wù)器成功響應(yīng)處理函數(shù)
{
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");
$('#h').val("191");
}
});
}
}
//上傳裁剪后的圖片
function upold() {
if($('#imgUrl').val()==''){
layer.alert("請(qǐng)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(zhuǎn)義反斜杠出問(wèn)題，這里將對(duì)其進(jìn)行轉(zhuǎn)換
var re = /(\+)/g;
var filename = filepath.replace(re, "#");
// 對(duì)路徑字符串進(jìn)行剪切截取
var one = filename.split("#");
// 獲取數(shù)組中最后一個(gè)，即文件名
var two = one[one.length - 1];
// 再對(duì)文件名進(jìn)行截取，以取得后綴名
var three = two.split(".");
// 獲取截取的最后一個(gè)字符串，即為后綴名
var last = three[three.length - 1];
// 添加需要判斷的后綴名類型
var tp = "jpg,gif,bmp,JPG,GIF,BMP,png";
// 返回符合條件的后綴名在字符串中的位置
var rs = tp.indexOf(last);
// 如果返回的結(jié)果大于或等于0，說(shuō)明包含允許上傳的文件類型
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(duì)路徑
// var fileSystem = new ActiveXObject("Scripting.FileSystemObject");
// // GetFile(path) 方法從磁盤獲取一個(gè)文件并返回。
// 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("圖片不能大于5M");
return false;
}
return true;
}
后臺(tái)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(qū)域。Rectangle 指定了坐標(biāo)空間中的一個(gè)區(qū)域，通過(guò) Rectangle 對(duì)象
*
* 的左上頂點(diǎn)的坐標(biāo)(x，y)、寬度和高度可以定義這個(gè)區(qū)域。
*/
Rectangle rect = new Rectangle(x, y, width, height);
// 提供一個(gè) BufferedImage，將其用作解碼像素?cái)?shù)據(jù)的目標(biāo)。
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(dāng)前時(shí)間的分鐘毫秒+3位隨機(jī)數(shù)
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 */
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(dāng)前年月日和小時(shí)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(zhǎng)高
* @param srcImagePath 讀取圖片路徑
* @param toImagePath 寫入圖片路徑
* @param width 縮小后圖片寬度
* @param height 縮小后圖片長(zhǎng)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(gòu)造Image對(duì)象
BufferedImage src = javax.imageio.ImageIO.read(file);
// 縮小邊長(zhǎng)
BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
// 繪制縮小后的圖片
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：根據(jù)壓縮基數(shù)和壓縮比來(lái)壓縮原圖，生產(chǎn)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(shù)
* @param scale 壓縮限制(寬/高)比例 一般用1：
* 當(dāng)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); //繪制縮小后的圖
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();
}
}
}
以上就是本文的全部?jī)?nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持億速云。
免責(zé)聲明：本站發(fā)布的內(nèi)容（圖片、視頻和文字）以原創(chuàng)、轉(zhuǎn)載和分享為主，文章觀點(diǎn)不代表本網(wǎng)站立場(chǎng)，如果涉及侵權(quán)請(qǐng)聯(lián)系站長(zhǎng)郵箱：is@yisu.com進(jìn)行舉報(bào)，并提供相關(guān)證據(jù)，一經(jīng)查實(shí)，將立刻刪除涉嫌侵權(quán)內(nèi)容。
億速云公眾號(hào)
手機(jī)網(wǎng)站二維碼