java完成上傳圖片停止切割的辦法。本站提示廣大學習愛好者：（java完成上傳圖片停止切割的辦法）文章只能為提供參考，不一定能成為您想要的結果。以下是java完成上傳圖片停止切割的辦法正文
本文實例講述了java完成上傳圖片停止切割的辦法。分享給年夜家供年夜家參考。詳細剖析以下：
為何我要停止上傳的圖片停止切割呢，我這個項目標圖片是部分logo，每一個部分都可以選擇分歧的logo，然則要應對閱讀器的兼容和拉伸，我選擇了把一張圖片切成左、中、右和剩下的部門，由於右邊和中變能夠會有圖案或許字所以不克不及拉伸，拉伸的只是左邊的部門，剩下的部門自順應便可以了。所以用了javax的ImageReader來操作。最初以blob類型保留數據庫中。
起首要在form表單外面寫上enctype="multipart/form-data"
<form method="post" id="mainForm" action="${ctx }/admin/department!save.action" enctype="multipart/form-data">
上面在表單中寫上上傳組件
<tr>
<td >
<strong>上傳Logo：</strong>
<input type="hidden" name="suffix" id="suffix" value="${depart.departmentLogo.suffix }"/>
</td>
<td >
<input type="file" name="logoFile" id="logoFile" onchange="checkFile();"/>
</td>
</tr>
<tr>
<td ></td>
<td >
<span class="red">（圖片格局：jpg,jpeg,bmp,gif,png;</span><br/>
<span class="red">推舉年夜小：1120×80像素）</span>
</td>
</tr>
圖片檢討的checkFile()辦法用於檢討圖片能否以劃定格局開頭和能否沒有選擇
function checkFile(){
var value = $("#logoFile").val();
if(!value){
alert("請選擇您要上傳的圖片！");
return false;
}else{
if(value.lastIndexOf(".jpg") != -1){
$("#suffix").val("jpg");
return true;
}else if(value.lastIndexOf(".jpeg") != -1){
$("#suffix").val("jpeg");
return true;
}else if(value.lastIndexOf(".gif") != -1){
$("#suffix").val("gif");
return true;
}else if(value.lastIndexOf(".bmp") != -1){
$("#suffix").val("bmp");
return true;
}else if(value.lastIndexOf(".png") != -1){
$("#suffix").val("png");
return true;
}else{
alert("對不起，您上傳文件格局有誤，請選擇指定格局的圖片文件上傳");
return false;
}
}
}
上面就是停止後台的save操作了。
public String save() throws Exception {
HttpServletRequest request = ServletActionContext.getRequest() ;
String departId = request.getParameter("id") ;
String departName = request.getParameter("name") ;
String companyId = request.getParameter("companyId") ;
//圖片後綴
String suffix = request.getParameter("suffix");
List<Menu> listMenu = new ArrayList<Menu>() ;
Company company = new Company() ;
company.setId(Long.valueOf(companyId)) ;
if(this.logoFile != null && departName != null && companyId != null && suffix != null){
//獲得解析圖片的ImageReader
Iterator<ImageReader> imageReaders = ImageIO.getImageReadersByFormatName(suffix);
ImageReader imageReader = imageReaders.next();
//把圖片以字撙節的情勢傳入
InputStream logoStream = new BufferedInputStream(new FileInputStream(this.logoFile));
//轉為圖片輸出流
ImageInputStream imageInputStream = ImageIO.createImageInputStream(logoStream);
imageReader.setInput(imageInputStream, true);
int imageWidth = imageReader.getWidth(0);
//固定高度80
int imageHeight = 80;
//設置左中右和剩下的寬度
int leftWidth = imageWidth / 2;
int middleWidth = (imageWidth - leftWidth) / 3;
int rightWidth = 5;
int retainWidth = imageWidth - leftWidth -middleWidth - 5;
ImageReadParam readParam = imageReader.getDefaultReadParam();
BufferedImage bImage = null;
//裁剪左半部門
//依據寬和高取得矩形
Rectangle leftImageRectangle = new Rectangle(0, 0, leftWidth, imageHeight);
readParam.setSourceRegion(leftImageRectangle);
bImage = imageReader.read(0, readParam);
//字節數組輸入流
ByteArrayOutputStream leftByteArrayOutputStream = new ByteArrayOutputStream();
ImageIO.write(bImage, suffix, leftByteArrayOutputStream);
//取得字節數組
byte[] leftImageData = leftByteArrayOutputStream.toByteArray();
leftByteArrayOutputStream.close();
//Hibernate創立一個blob類型
Blob leftBlob = Hibernate.createBlob(leftImageData, this.departmentManager.getSession());
//裁剪中部部門
Rectangle middleImageRectangle = new Rectangle(leftWidth, 0 , middleWidth, imageHeight);
readParam.setSourceRegion(middleImageRectangle);
bImage = imageReader.read(0, readParam);
ByteArrayOutputStream middleArrayOutputStream = new ByteArrayOutputStream();
ImageIO.write(bImage, suffix, middleArrayOutputStream);
byte[] middleImageData = middleArrayOutputStream.toByteArray();
middleArrayOutputStream.close();
Blob middleBlob = Hibernate.createBlob(middleImageData, this.departmentManager.getSession());
//裁剪右半部門
Rectangle rightImageRectangle = new Rectangle(leftWidth + middleWidth, 0, rightWidth, imageHeight);
readParam.setSourceRegion(rightImageRectangle);
bImage = imageReader.read(0, readParam);
ByteArrayOutputStream rightArrayOutputStream = new ByteArrayOutputStream();
ImageIO.write(bImage, suffix, rightArrayOutputStream);
byte[] rightImageData = rightArrayOutputStream.toByteArray();
rightArrayOutputStream.close();
Blob rightBlob = Hibernate.createBlob(rightImageData, this.departmentManager.getSession());
//保存部門
Rectangle retainRectangle = new Rectangle(leftWidth + middleWidth + rightWidth, 0, retainWidth, imageHeight);
readParam.setSourceRegion(retainRectangle);
bImage = imageReader.read(0, readParam);
ByteArrayOutputStream retainArrayOutputStream = new ByteArrayOutputStream();
ImageIO.write(bImage, suffix, retainArrayOutputStream);
byte[] retainImageData = retainArrayOutputStream.toByteArray();
retainArrayOutputStream.close();
Blob retainBlob = Hibernate.createBlob(retainImageData, this.departmentManager.getSession());
if(!departId.equals("") && departId!=null){
Department d = this.departmentManager.findById(Long.valueOf(departId)) ;
if(this.checkedAuthIds != null){
for(int i=0;i<checkedAuthIds.size();i++){
Menu menu = new Menu() ;
menu.setId(checkedAuthIds.get(i)) ;
listMenu.add(menu) ;
}
d.setMenus(listMenu) ;
}
d.getDepartmentLogo().setLeftPartImage(leftBlob);
d.getDepartmentLogo().setMiddlePartImage(middleBlob);
d.getDepartmentLogo().setRightPartImage(rightBlob);
d.getDepartmentLogo().setRetainPartImage(retainBlob);
d.getDepartmentLogo().setCreateTime(new Date());
d.getDepartmentLogo().setSuffix(suffix);
d.setName(departName) ;
d.setParentId(0L) ;
d.setNodeType(1) ;
d.setGrade(1) ;
d.setCompany(company) ;
this.departmentManager.save(d) ;
}else{
Integer parentNodeType = 0 ;
Department dd = new Department() ;
if(this.checkedAuthIds!=null && this.checkedAuthIds.size() != 0){
for(int i=0;i<checkedAuthIds.size();i++){
Menu menu = new Menu() ;
menu.setId(checkedAuthIds.get(i)) ;
listMenu.add(menu) ;
}
dd.setMenus(listMenu) ;
}else{
dd.setMenus(null) ;
}
DepartmentLogo departmentLogo = new DepartmentLogo() ;
departmentLogo.setCreateTime(new Date());
departmentLogo.setLeftPartImage(leftBlob);
departmentLogo.setMiddlePartImage(middleBlob);
departmentLogo.setRightPartImage(rightBlob);
departmentLogo.setRetainPartImage(retainBlob);
departmentLogo.setSuffix(suffix);
dd.setDepartmentLogo(departmentLogo);
dd.getDepartmentLogo().setDepartment(dd);
dd.setId(this.departmentManager.findMaxId()+1) ;
dd.setName(departName) ;
dd.setParentId(0L) ;
dd.setNodeType(1) ;
dd.setGrade(1) ;
dd.setOrderType(0) ;
dd.setCompany(company) ;
dd.setFlag(0) ;
this.departmentManager.save(dd) ;
}
}
return "reload";
}
上面就是顯示了，我是用的qui，所以在top.jsp下面的css中停止靜態顯示
<style type="text/css">
.welcome-hide{width: 210px;white-space: nowrap;overflow: hidden;text-overflow: ellipsis;}
#leftLogo{background: url(${ctx }/admin/department-logo!showLogo.action?position=left) no-repeat;width: ${leftWidth}px;height: 80px;}
#middleLogo{background: url(${ctx }/admin/department-logo!showLogo.action?position=middle) no-repeat;width: ${middleWidth}px;height: 80px;}
#rightLogo,#topTableStyle{background: url(${ctx }/admin/department-logo!showLogo.action?position=right) repeat-x;height: 80px;}
#retainLogo{background: url(${ctx }/admin/department-logo!showLogo.action?position=retain) no-repeat;width: ${retainWidth}px;height: 80px;}
</style>
department-logo!showLogo.action中的showLogo辦法就是加載圖片的辦法
public String showLogo() {
HttpServletRequest request = ServletActionContext.getRequest();
LoginUser loginUser = (LoginUser)((SecurityContext)request.getSession().
getAttribute("SPRING_SECURITY_CONTEXT")).getAuthentication().getPrincipal();
List<DepartmentLogo> logos = this.logoManager.findAll();
for (DepartmentLogo departmentLogo : logos) {
if (loginUser.getUser().getDepartment().getId().equals(departmentLogo.getDepartment().getId())) {
String param = request.getParameter("position");
Blob blob = null;
if (param != null) {
try {
if (param.equals("left")) {
blob = departmentLogo.getLeftPartImage();
imageLogo = blob.getBinaryStream();
return "showLogo";
}else if (param.equals("middle")) {
blob = departmentLogo.getMiddlePartImage();
imageLogo = blob.getBinaryStream();
return "showLogo";
}else if (param.equals("right")) {
blob = departmentLogo.getRightPartImage();
imageLogo = blob.getBinaryStream();
return "showLogo";
}else if (param.equals("retain")) {
blob = departmentLogo.getRetainPartImage();
imageLogo = blob.getBinaryStream();
return "showLogo";
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
return null;
}
固然前往的地址應當選擇struts2中的type="stream"
@Results({
@Result(name = "showLogo", type = "stream", params = {"contentType", "image/jpeg,"
+ "image/bmp,image/png,image/gif,image/jpeg",
"inputName", "imageLogo", "bufferSize", "4096"})
})
那末top.jsp中的width是怎樣獲得的呢？
其實加載菜單的時刻獲得的，上面是menu中的辦法
HttpServletRequest request = ServletActionContext.getRequest();
List<DepartmentLogo> logos = this.logoManager.findAll();
for (DepartmentLogo departmentLogo : logos) {
if (user.getDepartment().getId().equals(departmentLogo.getDepartment().getId())) {
request.setAttribute("leftWidth", ImageIO.read(departmentLogo.
getLeftPartImage().getBinaryStream()).getWidth());
request.setAttribute("middleWidth", ImageIO.read(departmentLogo.
getMiddlePartImage().getBinaryStream()).getWidth());
request.setAttribute("retainWidth", ImageIO.read(departmentLogo.
getRetainPartImage().getBinaryStream()).getWidth());
break;
}
}
如許就完成了一個上傳顯示功效。
這個就是我上傳的測試圖片。
願望本文所述對年夜家的Java法式設計有所贊助。
