JavaWeb实现裁剪图片上传完整代码
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"
+ "&TimeStamp=" + 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"
+ "&timeStamp=" + 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我们。
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