JavaWeb实现裁剪图片上传完整代码
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2024-03-12 21:23:51
本文实例为大家分享了javaweb实现裁剪图片上传完整案例，供大家参考，具体内容如下
实现思路
•使用jcrop插件手机要裁剪图片的坐标...
本文实例为大家分享了javaweb实现裁剪图片上传完整案例，供大家参考，具体内容如下
实现思路
•使用jcrop插件手机要裁剪图片的坐标
•将收集到的参数传递到后台，在后台使用java图形对象绘制图像进行裁剪
◦后台处理流程：
1、将上传的图片按按照比例进行压缩后上传到文件服务器，并且将压缩后的图片保存在本地临时目录中。
2、将压缩后的图片回显到页面，使用jcrop进行裁剪，手机裁剪坐标（x,y,width,height）
■@paramx 目标切片起点坐标x
■@param y 目标切片起点坐标y
■@param width 目标切片宽度
■@param height 目标切片高度
3、后台处理裁剪裁剪，重新上传
jsp页面
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contenttype="text/html;charset=utf-8" language="java" %>
<!doctype html>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8"/>
<title>上传用户头像</title>
<link href="${pagecontext.request.contextpath}/js/cutimg/css/master.css" rel="stylesheet" />
<link href="${pagecontext.request.contextpath}/js/cutimg/css/upload.css" rel="stylesheet" />
<link href="${pagecontext.request.contextpath}/js/cutimg/css/jquery.rollbar.css" rel="stylesheet" />
<link href="${pagecontext.request.contextpath}/js/cutimg/css/jquery.jcrop.css" rel="stylesheet" />
</head>
<body>
<div class="user_upload">
<form id="uploadimgfrom" enctype="multipart/form-data" method="post">
<div class="upload">
<div class="upload_left">
<div class="pic">
<div class="pic2" id="pic2" >
<div id="uploadfile">
<div class="upload_btn" style="margin-left: 75px;">
<a href="javascript:;" id="uptext" style="color:red;">上传头像</a>
</div>
<p>
支持jpg、png格式<br />
图片小于2m
</p>
</div>
<!--回显示图片-->
<img src="" name="photo" id="originalimg" alt=""/>
</div>
</div>
<p class="up_reload" id="up_reload" style="display: none;">
<a href="javascript:;" style="color: red">重新上传</a>
</p>
<input type="hidden" name="picval" id="picval" />
<input type="hidden" name="origpicval" id="origpicval" value="" />
<input type="hidden" name="temporigpic" id="temporigpic" />
<input type="hidden" name="fileid" id="fileid" size="100" />
<input type="hidden" name="fileurl" id="fileurl" size="100" />
<input type="hidden" name="imgheight" id="imgheight" size="100" />
<input type="hidden" name="imgwidth" id="imgwidth" size="100" />
</div>
<div class="upload_right">
<div class="upload_view_pic" style="width: 300px; height: 230px; border: solid 1px #ccc; overflow: hidden;">
<img id="preview_1" src="${pagecontext.request.contextpath}/images/4-3.jpg"/>
</div>
<p>
400 x 300像素
</p>
<%--<div class="upload_view_pic" style="width: 80px; height: 80px; border: solid 1px #ccc; overflow: hidden;">
<img id="preview_2" src=${pagecontext.request.contextpath}/images/4-3.jpg />
</div>
<p>
80 x 80像素
</p>--%>
<p>
拖拽或缩放，生成自己满意的头像
</p>
</div>
<%-- <div id="img_description">
<textarea
</div>--%>
<div class="upload_b">
<font id="upalert"></font>
</div>
</div>
<input type="hidden" name="x" id="x" size="5" />
<input type="hidden" name="y" id="y" size="5" />
<input type="hidden" name="w" id="w" size="5" />
<input type="hidden" name="h" id="h" size="5" />
<input type="hidden" name="imgurl" id="imgurl"/>
<input type="hidden" name="imgid" id="imgid"/>
<div class="upload_submit_contain">
<div class="upload_submit" id="saveimage">
<a href="javascript:;" style="color: red">保存头像</a>
</div>
</div>
</form>
</div>
</body>
<script type="text/javascript" src="${pagecontext.request.contextpath}/js/jquery.form.js"></script>
<script type="text/javascript" src="${pagecontext.request.contextpath}/js/jquery.validate.min.js"></script>
<script type="text/javascript" src="${pagecontext.request.contextpath}/js/check.js"></script>
<script src="${pagecontext.request.contextpath}/js/cutimg/js/jquery-1.7.1.min.js" type="text/javascript"></script>
<script src="${pagecontext.request.contextpath}/js/cutimg/js/jquery.form.js" type="text/javascript"></script>
<script src="${pagecontext.request.contextpath}/js/cutimg/js/jquery-custom-file-input.js" type="text/javascript"></script>
<script src="${pagecontext.request.contextpath}/js/cutimg/js/jquery.jcrop.js" type="text/javascript"></script>
<script src="${pagecontext.request.contextpath}/js/cutimg/js/jquery.rollbar.min.js" type="text/javascript"></script>
<script src="${pagecontext.request.contextpath}/js/cutimg/js/upload.ui.photos.js" type="text/javascript"></script>
<script type="text/javascript" src="${pagecontext.request.contextpath}/js/dialog/dialog.js?lib=false"></script>
<script type="text/javascript">
photos.jcorpwidth = 400;//裁剪选择框宽度
photos.jcorpheight = 300;//裁剪框选择高度
// photos.widths = ["200", "80"];// 图片大小“宽”数组，根据图片张数由大到小定义不同图片的宽度
// photos.heights = ["200", "80"];// 图片大小“高”数组，根据图片张数由大到小定义不同图片的高度
photos.upload_fileid = "uploadfile";//上传组件属性id
photos.upload_filetextid = "uptext";//上传组件按钮文本id
photos.upload_alertid = "upalert";//提示文本id
photos.upload_alertclassname = "error";//提示文本增加的样式
photos.upload_formid = "uploadimgfrom";//上传组件表单id
photos.upload_originfileid = "originalimg";//底图图片id
photos.upload_reloadid = "up_reload";//重新上传组件id
photos.upload_picvalueid = "picval";//上传的底图片内容id
photos.upload_picfileid = "fileid";////上传图片id
photos.upload_picfileurl = "fileurl";////上传图片url
photos.upload_picimgheight="imgheight";//上传的底图高
photos.upload_picimgwidth="imgwidth";//上传的底图宽
photos.upload_temporiginvalueid = "temporigpic";//本页面重新上传时的原图片内容id
photos.upload_originvalueid = "origpicval";//其他页面进入时的原图片内容id
photos.upload_rollbarid = "pic2";//自定义滚动条id
photos.upload_saveid = "saveimage";//图片保存按钮id
photos.upload_previewprefix = "preview_";//多个不同尺寸小图的id前缀名称，多个小图id格式“前缀”+数字编号（从1开始），例：id="photos_preview1" ...
photos.parentfileimgid = "imgurl";//父级图片控件id
photos.parentfilevalueid = "imgid";//父级图片地址控件id
photos.xid = "x";//x
photos.yid = "y";//y
photos.wid = "w";//w
photos.hid = "h";//h
photos.uptext_format = "抱歉，暂只支持 jpg、png、bmp 格式";//图片格式验证文本
/* photos.uptext_size = "抱歉，图片大小不能超过2m";*///图片大小验证文本
/*photos.uptext_error = "图片上传出错";//上传出错文本*/
photos.url_check = "/enterprise/filescheck";//文件验证大小的地址
photos.url_upload = "/enterprise/uploadphoto?up=original";//上传图片载入底图的地址
photos.url_reload = "";//重新上传的地址
photos.url_save = "/enterprise/saveimg?up=save";//保存图片的地址
</script>
</html>
后台java代码
图片上传工具类
package com.shengya.service.utils;
import com.shengya.service.imgcontants;
import org.apache.commons.fileupload.disk.diskfileitem;
import org.springframework.web.multipart.multipartfile;
import org.springframework.web.multipart.commons.commonsmultipartfile;
import sun.misc.base64encoder;
import javax.crypto.mac;
import javax.crypto.secretkey;
import javax.crypto.spec.secretkeyspec;
import javax.imageio.imageio;
import javax.imageio.imagereadparam;
import java.awt.*;
import java.awt.geom.affinetransform;
import java.awt.image.affinetransformop;
import java.awt.image.bufferedimage;
import java.io.*;
import java.net.httpurlconnection;
import java.net.url;
import java.net.urlencoder;
import java.util.arraylist;
/**
* @author darcy
* created by administrator on 2016/6/17.
*/
public class uploadutils {
// public final static string radiourl = "http://211.102.216.237:8011/fileserver/webapi/attachments/bio?";
public final static string radiourl = "http://192.168.1.15:8088/fileserver/webapi/attachments/bio?";
public final static string url = imgcontants.img_upload + "/file/uploadimage?";
public final static string fileurl = imgcontants.img_upload + "/file/uploadfile?";
public final static string vediourl = imgcontants.file_upload + "/file/uploadfile?";
public final static string cropurl = imgcontants.img_upload + "/file/cropimage?";
private static byte[] readasbytearr(inputstream is) {
bytearrayoutputstream baos = new bytearrayoutputstream();
try {
byte[] bytes = new byte[1024];
int length = 0;
while ((length = is.read(bytes)) != -1) {
baos.write(bytes, 0, length);
}
return baos.tobytearray();
} catch (exception e) {
e.printstacktrace();
} finally {
try {
baos.close();
} catch (ioexception e) {
e.printstacktrace();
}
}
return null;
}
/**
* 上传图片
*
* @param file
*/
public static string submitimage(file file) throws unsupportedencodingexception {
string filename = urlencoder.encode(file.getname(), "utf-8");
long filesize = file.length();
boolean isresuffix = true;
int height = 0;
int width = 500;
string mark = "t";
string mode = "w";
string url = sign(url)
+ "&channelno=muying_android"
+ "&filename="
+ filename
+ "&filesize="
+ filesize
+ "&isresuffix="
+ isresuffix
+ "&height="
+ height
+ "&width="
+ width + "&mark=" + mark + "&mode=" + mode;
system.out.println("url:" + url);
httpurlconnection conn = null;
outputstream outstream = null;
bufferedinputstream bin = null;
try {
bin = new bufferedinputstream(new fileinputstream(file));
conn = (httpurlconnection) new url(url)
.openconnection();
conn.setconnecttimeout(15000);
conn.setrequestmethod("post");
conn.setdooutput(true);
// conn.setfixedlengthstreamingmode(file.length());
conn.setrequestproperty("content-type",
"application/x-www-form-urlencoded");
conn.setrequestproperty("content-length", file.length()
+ "");
// conn.setrequestproperty("range", "bytes="+"");
// 设置 httpurlconnection的字符编码
conn.setrequestproperty("accept-charset", "utf-8");
outstream = conn.getoutputstream();
byte[] buf = new byte[1024];
int len = 0;
int lencount = 0;
while ((len = bin.read(buf)) != -1) {
outstream.write(buf, 0, len);//ok
lencount = lencount + len;
}
outstream.flush();
int responsecode = conn.getresponsecode();
if (responsecode == 200) {
inputstream instream = conn.getinputstream();
byte[] data1 = readasbytearr(instream);
string json = new string(data1);
instream.close();
return json;
} else {
inputstream instream = conn.getinputstream();
byte[] data1 = readasbytearr(instream);
string json = new string(data1);
instream.close();
return json;
}
} catch (exception e) {
e.printstacktrace();
} finally {
try {
if (outstream != null) {
outstream.close();
}
} catch (ioexception e) {
e.printstacktrace();
}
}
return null;
}
/**
* 上传图片
*
* @param file
*/
public static string submitwebimage(multipartfile file) throws unsupportedencodingexception {
string filename = urlencoder.encode(file.getoriginalfilename(), "utf-8");
long filesize = file.getsize();
boolean isresuffix = true;
int height = 0;
int width = 500;
string mark = "t";
string mode = "w";
string url = sign(url)
+ "&channelno=muying_android"
+ "&filename="
+ filename
+ "&filesize="
+ filesize
+ "&isresuffix="
+ isresuffix
+ "&height="
+ height
+ "&width="
+ width + "&mark=" + mark + "&mode=" + mode;
system.out.println("url:" + url);
httpurlconnection conn = null;
outputstream outstream = null;
bufferedinputstream bin = null;
try {
bin = new bufferedinputstream(file.getinputstream());
conn = (httpurlconnection) new url(url)
.openconnection();
conn.setconnecttimeout(15000);
conn.setrequestmethod("post");
conn.setdooutput(true);
// conn.setfixedlengthstreamingmode(file.length());
conn.setrequestproperty("content-type",
"application/x-www-form-urlencoded");
conn.setrequestproperty("content-length", file.getsize()
+ "");
// conn.setrequestproperty("range", "bytes="+"");
// 设置 httpurlconnection的字符编码
conn.setrequestproperty("accept-charset", "utf-8");
outstream = conn.getoutputstream();
byte[] buf = new byte[1024];
int len = 0;
int lencount = 0;
while ((len = bin.read(buf)) != -1) {
outstream.write(buf, 0, len);//ok
lencount = lencount + len;
}
outstream.flush();
int responsecode = conn.getresponsecode();
if (responsecode == 200) {
inputstream instream = conn.getinputstream();
byte[] data1 = readasbytearr(instream);
string json = new string(data1);
instream.close();
return json;
} else {
inputstream instream = conn.getinputstream();
byte[] data1 = readasbytearr(instream);
string json = new string(data1);
instream.close();
return json;
}
} catch (exception e) {
e.printstacktrace();
} finally {
try {
if (outstream != null) {
outstream.close();
}
} catch (ioexception e) {
e.printstacktrace();
}
}
return null;
}
/**
* 上传视频
*
* @param file
*/
public static string submitradio(multipartfile file) throws exception {
string url = signradio(radiourl);
system.out.println("url:" + url);
httpurlconnection conn = null;
outputstream outstream = null;
bufferedinputstream bin = null;
try {
bin = new bufferedinputstream(file.getinputstream());
conn = (httpurlconnection) new url(url)
.openconnection();
conn.setconnecttimeout(15000);
conn.setrequestmethod("post");
conn.setdooutput(true);
conn.setrequestproperty("content-type",
"application/x-www-form-urlencoded");
conn.setrequestproperty("content-length", file.getsize()
+ "");
conn.setrequestproperty("accept-charset", "utf-8");
outstream = conn.getoutputstream();
byte[] buf = new byte[1024];
int len = 0;
int lencount = 0;
while ((len = bin.read(buf)) != -1) {
outstream.write(buf, 0, len);//ok
lencount = lencount + len;
}
outstream.flush();
int responsecode = conn.getresponsecode();
if (responsecode == 200) {
inputstream instream = conn.getinputstream();
byte[] data1 = readasbytearr(instream);
string json = new string(data1);
instream.close();
return json;
} else {
inputstream instream = conn.getinputstream();
byte[] data1 = readasbytearr(instream);
string json = new string(data1);
instream.close();
return json;
}
} catch (exception e) {
e.printstacktrace();
} finally {
try {
if (outstream != null) {
outstream.close();
}
} catch (ioexception e) {
e.printstacktrace();
}
}
return null;
}
/**
* 上传简历快照
*
* @param filename
* @param content
* @return
* @throws unsupportedencodingexception
*/
public static string submitfile(string filename, string content) throws unsupportedencodingexception {
//content = urlencoder.encode(content, "utf-8");
filename = urlencoder.encode(filename, "utf-8");
byte[] contentbytes = content.getbytes();
long filesize = contentbytes.length;
boolean isresuffix = true;
int height = 0;
int width = 500;
string mark = "t";
string mode = "w";
string url = sign(fileurl)
+ "&channelno=muying_android"
+ "&filename="
+ filename
+ "&filesize="
+ filesize
+ "&isresuffix="
+ isresuffix
+ "&height="
+ height
+ "&width="
+ width + "&mark=" + mark + "&mode=" + mode;
system.out.println("url:" + url);
httpurlconnection conn = null;
outputstream outstream = null;
bufferedinputstream bin = null;
try {
conn = (httpurlconnection) new url(url)
.openconnection();
conn.setconnecttimeout(15000);
conn.setrequestmethod("post");
conn.setdooutput(true);
// conn.setfixedlengthstreamingmode(file.length());
conn.setrequestproperty("content-type",
"application/x-www-form-urlencoded");
conn.setrequestproperty("content-length", content.length()
+ "");
// conn.setrequestproperty("range", "bytes="+"");
// 设置 httpurlconnection的字符编码
conn.setrequestproperty("accept-charset", "utf-8");
outstream = conn.getoutputstream();
outstream.write(contentbytes, 0, contentbytes.length);//ok
outstream.flush();
int responsecode = conn.getresponsecode();
if (responsecode == 200) {
inputstream instream = conn.getinputstream();
byte[] data1 = readasbytearr(instream);
string json = new string(data1);
instream.close();
return json;
} else {
inputstream instream = conn.getinputstream();
byte[] data1 = readasbytearr(instream);
string json = new string(data1);
instream.close();
return json;
}
} catch (exception e) {
e.printstacktrace();
} finally {
try {
if (outstream != null) {
outstream.close();
}
} catch (ioexception e) {
e.printstacktrace();
}
}
return null;
}
/**
* 上传附件
*
* @return json 字符串
* @throws unsupportedencodingexception
*/
public static string submitfile(multipartfile file) throws unsupportedencodingexception {
string filename = urlencoder.encode(file.getoriginalfilename(), "utf-8");
long filesize = file.getsize();
boolean isresuffix = true;
int height = 0;
int width = 500;
string mark = "t";
string mode = "w";
string url = sign(fileurl)
+ "&channelno=muying_android"
+ "&filename="
+ filename
+ "&filesize="
+ filesize
+ "&isresuffix="
+ isresuffix
+ "&height="
+ height
+ "&width="
+ width + "&mark=" + mark + "&mode=" + mode;
system.out.println("url:" + url);
httpurlconnection conn = null;
outputstream outstream = null;
bufferedinputstream bin = null;
try {
bin = new bufferedinputstream(file.getinputstream());
conn = (httpurlconnection) new url(url)
.openconnection();
conn.setconnecttimeout(15000);
conn.setrequestmethod("post");
conn.setdooutput(true);
// conn.setfixedlengthstreamingmode(file.length());
conn.setrequestproperty("content-type",
"application/x-www-form-urlencoded");
conn.setrequestproperty("content-length", file.getsize()
+ "");
// conn.setrequestproperty("range", "bytes="+"");
// 设置 httpurlconnection的字符编码
conn.setrequestproperty("accept-charset", "utf-8");
outstream = conn.getoutputstream();
byte[] buf = new byte[1024];
int len = 0;
int lencount = 0;
while ((len = bin.read(buf)) != -1) {
outstream.write(buf, 0, len);//ok
lencount = lencount + len;
}
int responsecode = conn.getresponsecode();
if (responsecode == 200) {
inputstream instream = conn.getinputstream();
byte[] data1 = readasbytearr(instream);
string json = new string(data1);
instream.close();
return json;
} else {
inputstream instream = conn.getinputstream();
byte[] data1 = readasbytearr(instream);
string json = new string(data1);
instream.close();
return json;
}
} catch (exception e) {
e.printstacktrace();
} finally {
try {
if (outstream != null) {
outstream.close();
}
} catch (ioexception e) {
e.printstacktrace();
}
}
return null;
}
private static string sign(string baseurl) throws unsupportedencodingexception {
long currebttime = system.currenttimemillis();
long timestamp = currebttime / 1000;
string data = "actionname=uploadimage" + "&secretkey=4b19f08dbf0adb82ce9cc7c207ec1dc9"
+ "×tamp=" + timestamp;
string signature = hmac_sha1("4b19f08dbf0adb82ce9cc7c207ec1dc9",
urlencoder.encode(data, "utf-8"));
signature = signature.replace("%3d", "%3d");
signature = signature.replace("%3a", "%3a");
signature = signature.replace("%2f", "%2f");
return baseurl + data + "&signature=" + signature;
}
private static string signradio(string url) throws exception {
long currebttime = system.currenttimemillis();
string data = "secretkey=f1b79c865c424be46183a2f0a49a0f15"
+ "×tamp=" + currebttime;
system.out.println("url:" + url + data);
system.out.println("url = " + urlencoder.encode(url + data, "utf-8"));
string signature = hmacsha1util.getsignature(urlencoder.encode(url + data, "utf-8"), "f1b79c865c424be46183a2f0a49a0f15");
return url + data + "&signature=" + signature;
}
private static string hmac_sha1(string key, string datas) {
string restring = "";
try {
datas = datas.replace("%3a", "%3a");
datas = datas.replace("%2f", "%2f");
datas = datas.replace("%3d", "%3d");
byte[] data = key.getbytes("utf-8");
// 根据给定的字节数组构造一个密钥,第二参数指定一个密钥算法的名称
secretkey secretkey = new secretkeyspec(data, "hmacsha1");
// 生成一个指定 mac 算法 的 mac 对象
mac mac = mac.getinstance("hmacsha1");
// 用给定密钥初始化 mac 对象
mac.init(secretkey);
byte[] text = datas.getbytes("utf-8");
// 完成 mac 操作
byte[] text1 = mac.dofinal(text);
restring = new base64encoder().encodebuffer(text1);
restring = urlencoder.encode(restring, "utf-8");
restring = restring.replace("%0a", "");
restring = restring.replace("%0d", "");
} catch (exception e) {
e.printstacktrace();
}
return restring;
}
/**
* 上传裁剪图片
* zxiao 2016/09/01
*
* @param fileid
*/
public static string submitcutedwebimage(multipartfile file,string fileid,string x,string y,string w,string h) throws unsupportedencodingexception {
string fileid=fileid;
string[] cropwidths=new string[]{"50"};//裁剪宽度
//list<string> list=new list<string>();
//list<string> list = new arraylist<string>(5);
arraylist<string> listcropwidths = new arraylist<string>();
listcropwidths.add("400");
// string[] cropheights=new string[]{"50"};//裁剪高度
arraylist<string> listcropheights = new arraylist<string>();
listcropheights.add("300");
int cropx=integer.parseint(x);//裁剪x坐标
int cropy=integer.parseint(y);//裁剪y坐标
// string[] cropfixs=new string[]{"l"};//裁剪图片的标示集合
arraylist<string> listcropfixs = new arraylist<string>();
listcropfixs.add("l");
string sourcesuffix="jpg";//底图后缀
string sourcefix="";//底图标示
/* boolean isresuffix = true;
int height = 1000;
int width = 750;
string mark = "t";
string mode = "w";*/
string url = sign(cropurl) + "fileid="
+ fileid
+ "&cropwidths="
+ listcropwidths
+ "&cropheights="
+ listcropheights
+ "&cropx="
+ cropx
+ "&cropy="
+ cropy + "&cropfixs=" + listcropfixs + "&sourcesuffix=" + sourcesuffix+ "&sourcefix=" + sourcefix;
system.out.println("url:" + url);
httpurlconnection conn = null;
outputstream outstream = null;
bufferedinputstream bin = null;
try {
bin = new bufferedinputstream(file.getinputstream());
conn = (httpurlconnection) new url(url)
.openconnection();
conn.setconnecttimeout(15000);
conn.setrequestmethod("post");
conn.setdooutput(true);
// conn.setfixedlengthstreamingmode(file.length());
conn.setrequestproperty("content-type",
"application/x-www-form-urlencoded");
conn.setrequestproperty("content-length", file.getsize()
+ "");
// conn.setrequestproperty("range", "bytes="+"");
// 设置 httpurlconnection的字符编码
conn.setrequestproperty("accept-charset", "utf-8");
outstream = conn.getoutputstream();
byte[] buf = new byte[1024];
int len = 0;
int lencount = 0;
while ((len = bin.read(buf)) != -1) {
outstream.write(buf, 0, len);//ok
lencount = lencount + len;
}
int responsecode = conn.getresponsecode();
if (responsecode == 200) {
inputstream instream = conn.getinputstream();
byte[] data1 = readasbytearr(instream);
string json = new string(data1);
instream.close();
return json;
} else {
inputstream instream = conn.getinputstream();
byte[] data1 = readasbytearr(instream);
string json = new string(data1);
instream.close();
return json;
}
} catch (exception e) {
e.printstacktrace();
} finally {
try {
if (outstream != null) {
outstream.close();
}
} catch (ioexception e) {
e.printstacktrace();
}
}
return null;
}
/**上传裁剪后图片 需在本地保存副本
*zxiao 2016/09/01
* @param ，
* @param x
* @param y
* @param w
* @param h
* @return
* @throws ioexception
*/
public static string submitcropimage(multipartfile file,integer x,integer y,integer w,integer h) throws ioexception {
string folder=system.getproperty("java.io.tmpdir");
file tempdir =new file(folder);
//如果文件夹不存在则创建
if (!tempdir .exists() && !tempdir .isdirectory())
{
// system.out.println("//不存在");
tempdir .mkdir();
}
//压缩后临时文件
string srcpath=folder+"scaletemp.jpg";
//获取文件的后缀
/*file uploadfile = new file(srcpath);
inputstream inputstream = file.getinputstream();
fileinputstream fs= (fileinputstream) inputstream;
string srcimg = urlencoder.encode(file.getoriginalfilename(), "utf-8");
string suffix=srcimg.substring(srcimg.lastindexof(".")+1);*/
//裁剪图片
cutimgutils o = new cutimgutils(x,y,w,h);
o.setsrcpath(srcpath);
o.setsubpath(folder+"uptemp.jpg");
file tempfile = o.cut("jpg");
string s = submitimage(tempfile);
return s;
}
/**
* 获取上传图片的宽
* zxiao 2016/09/09
* @param file
* @return
*/
public static int getimgwidth(multipartfile file) throws ioexception {
inputstream is = null;
bufferedimage src = null;
int ret = -1;
try {
is = file.getinputstream();
src = javax.imageio.imageio.read(is);
ret = src.getwidth(null); // 得到源图宽
is.close();
} catch (exception e) {
e.printstacktrace();
}
return ret;
}
/**
* 获取上传图片的高
* zxiao 2016/09/09
* @param file
* @return
*/
public static int getimgheight(multipartfile file) {
inputstream is = null;
bufferedimage src = null;
int ret = -1;
try {
is = file.getinputstream();
src = javax.imageio.imageio.read(is);
ret = src.getheight(null); // 得到源图高
is.close();
} catch (exception e) {
e.printstacktrace();
}
return ret;
}
/**
* 缩放图像（按高度和宽度缩放）
* @param file 文件对象
* @param result 缩放后的图像地址
* @param height 缩放后的高度
* @param width 缩放后的宽度
* @param bb 比例不对时是否需要补白：true为补白; false为不补白;
*/
public static void scale(multipartfile file, string result, int height, int width, boolean bb) {
try {
double ratio = 0.0; // 缩放比例
/*commonsmultipartfile cf= (commonsmultipartfile)file;
diskfileitem fi = (diskfileitem)cf.getfileitem();
file f = fi.getstorelocation();*/
// file f = new file(srcimagefile);
inputstream inputstream = file.getinputstream();
bufferedimage bi = imageio.read(inputstream);
image itemp = bi.getscaledinstance(width, height, bi.scale_smooth);
// 计算比例
if ((bi.getheight() > height) || (bi.getwidth() > width)) {
if (bi.getheight() > bi.getwidth()) {
ratio = (new integer(height)).doublevalue()
/ bi.getheight();
} else {
ratio = (new integer(width)).doublevalue() / bi.getwidth();
}
affinetransformop op = new affinetransformop(affinetransform
.getscaleinstance(ratio, ratio), null);
itemp = op.filter(bi, null);
}
if (bb) {//补白
bufferedimage image = new bufferedimage(width, height,
bufferedimage.type_int_rgb);
graphics2d g = image.creategraphics();
g.setcolor(color.white);
g.fillrect(0, 0, width, height);
if (width == itemp.getwidth(null))
g.drawimage(itemp, 0, (height - itemp.getheight(null)) / 2,
itemp.getwidth(null), itemp.getheight(null),
color.white, null);
else
g.drawimage(itemp, (width - itemp.getwidth(null)) / 2, 0,
itemp.getwidth(null), itemp.getheight(null),
color.white, null);
g.dispose();
itemp = image;
}
imageio.write((bufferedimage) itemp, "jpg", new file(result));
} catch (ioexception e) {
e.printstacktrace();
}
}
public static void main(string[] args) {
try {
/* file file = new file("e:\\bole\\doc\\服务接口文档\\伯乐服务接口说明v1.0.docx");
system.out.println("file = " + file);
string json = submitfile(file);
system.out.println("json = " + json);*/
} catch (exception e) {
e.printstacktrace();
}
}
}
图片裁剪工具类
package com.shengya.service.utils;
import javax.imageio.imageio;
import javax.imageio.imagereadparam;
import javax.imageio.imagereader;
import javax.imageio.stream.imageinputstream;
import java.awt.*;
import java.awt.image.bufferedimage;
import java.io.file;
import java.io.fileinputstream;
import java.io.ioexception;
import java.util.iterator;
/**
* created by administrator on 2016/9/1.
*/
public class cutimgutils {
// ===源图片路径名称如：c:\1.jpg
private string srcpath;
// ===剪切图片存放路径名称。如：c:\2.jpg
private string subpath;
public void setsrcpath(string srcpath) {
this.srcpath = srcpath;
}
public void setsubpath(string subpath) {
this.subpath = subpath;
}
// ===剪切点x坐标
private int x;
private int y;
// ===剪切点宽度
private int width;
private int height;
public cutimgutils() {
}
public cutimgutils(int x, int y, int width, int height) {
if(x<0){
x=0;
}else{
this.x = x;
}
if(y<0){
y=0;
}else{
this.y = y;
}
this.width = width;
this.height = height;
}
/**
*
* 对图片裁剪，并把裁剪完蛋新图片保存 。
*/
public file cut() throws ioexception {
fileinputstream is = null;
imageinputstream iis = null;
try {
// 读取图片文件
is = new fileinputstream(srcpath);
/**
*
* 返回包含所有当前已注册 imagereader 的 iterator，这些 imagereader
*
* 声称能够解码指定格式。 参数：formatname - 包含非正式格式名称 .
*
* (例如 "jpeg" 或 "tiff")等 。
*/
iterator<imagereader> it = imageio
.getimagereadersbyformatname("jpg");
imagereader reader = it.next();
// 获取图片流
iis = imageio.createimageinputstream(is);
/**
*
* <p>
* iis:读取源。true:只向前搜索
* </p>
* .将它标记为 ‘只向前搜索'。
*
* 此设置意味着包含在输入源中的图像将只按顺序读取，可能允许 reader
*
* 避免缓存包含与以前已经读取的图像关联的数据的那些输入部分。
*/
reader.setinput(iis, true);
/**
*
* <p>
* 描述如何对流进行解码的类
* <p>
* .用于指定如何在输入时从 java image i/o
*
* 框架的上下文中的流转换一幅图像或一组图像。用于特定图像格式的插件
*
* 将从其 imagereader 实现的 getdefaultreadparam 方法中返回
*
* imagereadparam 的实例。
*/
imagereadparam param = reader.getdefaultreadparam();
/**
*
* 图片裁剪区域。rectangle 指定了坐标空间中的一个区域，通过 rectangle 对象
*
* 的左上顶点的坐标(x，y)、宽度和高度可以定义这个区域。
*/
rectangle rect = new rectangle(x, y, width, height);
// 提供一个 bufferedimage，将其用作解码像素数据的目标。
param.setsourceregion(rect);
/**
*
* 使用所提供的 imagereadparam 读取通过索引 imageindex 指定的对象，并将
*
* 它作为一个完整的 bufferedimage 返回。
*/
bufferedimage bi = reader.read(0, param);
// 保存新图片
imageio.write(bi, "jpg", new file(subpath));
file file = new file("subpath");
return file;
} finally {
if (is != null)
is.close();
if (iis != null)
iis.close();
}
}
public file cut(string suffix) throws ioexception {
fileinputstream is = null;
imageinputstream iis = null;
try {
// 读取图片文件
is = new fileinputstream(srcpath);
// is = inputstream;
/**
*
* 返回包含所有当前已注册 imagereader 的 iterator，这些 imagereader
*
* 声称能够解码指定格式。 参数：formatname - 包含非正式格式名称 .
*
* (例如 "jpeg" 或 "tiff")等 。
* iterator<imagereader> it = imageio.getimagereadersbyformatname("jpg");
*/
string suffixname=null;
if(suffix.equals("gif")){
suffixname="gif";
}else if(suffix.equals("png")){
suffixname="png";
} else{
suffixname="jpg";
}
iterator<imagereader> it = imageio
.getimagereadersbyformatname(suffixname);
imagereader reader = it.next();
// 获取图片流
iis = imageio.createimageinputstream(is);
/**
*
* <p>
* iis:读取源。true:只向前搜索
* </p>
* .将它标记为 ‘只向前搜索'。
*
* 此设置意味着包含在输入源中的图像将只按顺序读取，可能允许 reader
*
* 避免缓存包含与以前已经读取的图像关联的数据的那些输入部分。
*/
reader.setinput(iis, true);
/**
*
* <p>
* 描述如何对流进行解码的类
* <p>
* .用于指定如何在输入时从 java image i/o
*
* 框架的上下文中的流转换一幅图像或一组图像。用于特定图像格式的插件
*
* 将从其 imagereader 实现的 getdefaultreadparam 方法中返回
*
* imagereadparam 的实例。
*/
imagereadparam param = reader.getdefaultreadparam();
/**
*
* 图片裁剪区域。rectangle 指定了坐标空间中的一个区域，通过 rectangle 对象
*
* 的左上顶点的坐标(x，y)、宽度和高度可以定义这个区域。
*/
rectangle rect = new rectangle(x, y, width, height);
// 提供一个 bufferedimage，将其用作解码像素数据的目标。
param.setsourceregion(rect);
/**
*
* 使用所提供的 imagereadparam 读取通过索引 imageindex 指定的对象，并将
*
* 它作为一个完整的 bufferedimage 返回。
*/
bufferedimage bi = reader.read(0, param);
// 保存新图片
imageio.write(bi, "jpg", new file(subpath));
file file = new file(subpath);
return file;
} finally {
if (is != null)
is.close();
if (iis != null)
iis.close();
}
}
}
遇到的问题总结：
-裁剪图片发生偏移现象
解决办法：使用压缩后的图片等比例收集裁切坐标信息
-multipartfile 和 file之间相互转化
第一种方法：
multipartfile file = xxx;
commonsmultipartfile cf= (commonsmultipartfile)file;
diskfileitem fi = (diskfileitem)cf.getfileitem();
file f = fi.getstorelocation();
会在项目的根目录的临时文件夹下生成一个文件；
第二种方法：
transferto(file dest)；
会在项目中生成一个新文件；
第三种方法：
file f = (file) xxx 强转即可。前提是要配置multipartresolver，要不然会报类型转换失败的异常。
<bean id="multipartresolver" class="org.springframework.web.multipart.commons.commonsmultipartresolver">
<property name="maxuploadsize" value="104857600"/>
<property name="maxinmemorysize" value="4096"/>
</bean>
没试过；
第四种方法：
workbook wb = workbook.getworkbook(xxx .getinputstream());
转换为输入流，直接读取；
第五种方法：
byte[] buffer = myfile.getbytes();
先转换为字节数组，没试过；
第六种方法：
直接转成输入流
multipartfile file=xxx; is = file.getinputstream(); src = javax.imageio.imageio.read(is); ret = src.getwidth(null); // 得到源图宽
参考资料：
jcop api：http://code.ciaoca.com/jquery/jcrop/.
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。
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