本文实例为大家分享了SpringMVC结合Jcrop实现图片裁剪的具体代码，供大家参考，具体内容如下
一、jsp页面：
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<form name="form" action="<%=request.getContextPath()%>/UploadDemo/uploadHeadImage" class="form-horizontal"
method="post" enctype="multipart/form-data">
<div class="modal-body text-center">
<div class="zxx_main_con">
<div class="zxx_test_list">
<input class="photo-file" type="file" name="imgFile" id="fcupload" onchange="readURL(this);"/>
<img alt="" src="" id="cutimg"/>
<input type="hidden" id="x" name="x"/>
<input type="hidden" id="y" name="y"/>
<input type="hidden" id="w" name="w"/>
<input type="hidden" id="h" name="h"/>
</div>
</div>
</div>
<div class="modal-footer">
<button id="submit" onclick="">上传</button>
</div>
</form>
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二、jcrop组件引用情况：
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<link rel="stylesheet" href="<c:url value="/resources/uploadPlugin/css/jquery.Jcrop.css"/>" type="text/css"></link>
<script type="text/javascript" src="<c:url value="/resources/uploadPlugin/scripts/jquery-1.8.3.js"/>"></script>
<script type="text/javascript" src="<c:url value="/resources/uploadPlugin/scripts/jquery.Jcrop.js"/>"></script>
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三、jcrop使用方法
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<script type="text/javascript">
//定义一个全局api，这样操作起来比较灵活
var api = null;
function readURL(input) {
if (input.files && input.files[0]) {
var reader = new FileReader();
reader.readAsDataURL(input.files[0]);
reader.onload = function (e) {
$('#cutimg').removeAttr('src');
$('#cutimg').attr('src', e.target.result);
api = $.Jcrop('#cutimg', {
setSelect: [ 20, 20, 200, 200 ],
aspectRatio: 1,
onSelect: updateCoords
});
};
if (api != undefined) {
api.destroy();
}
}
function updateCoords(obj) {
$("#x").val(obj.x);
$("#y").val(obj.y);
$("#w").val(obj.w);
$("#h").val(obj.h);
};
}
</script>
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四、后台代码：
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@RequestMapping(value = "/uploadHeadImage")
public String uploadHeadImage(
HttpServletRequest request,
@RequestParam(value = "x") String x,
@RequestParam(value = "y") String y,
@RequestParam(value = "h") String h,
@RequestParam(value = "w") String w,
@RequestParam(value = "imgFile") MultipartFile imageFile
) throws Exception{
System.out.println("==========Start=============");
String realPath = request.getSession().getServletContext().getRealPath("/");
String resourcePath = "resources/uploadImages/";
if(imageFile!=null){
if(FileUploadUtil.allowUpload(imageFile.getContentType())){
String fileName = FileUploadUtil.rename(imageFile.getOriginalFilename());
int end = fileName.lastIndexOf(".");
String saveName = fileName.substring(0,end);
File dir = new File(realPath + resourcePath);
if(!dir.exists()){
dir.mkdirs();
}
File file = new File(dir,saveName+"_src.jpg");
imageFile.transferTo(file);
String srcImagePath = realPath + resourcePath + saveName;
int imageX = Integer.parseInt(x);
int imageY = Integer.parseInt(y);
int imageH = Integer.parseInt(h);
int imageW = Integer.parseInt(w);
//这里开始截取操作
System.out.println("==========imageCutStart=============");
ImageCut.imgCut(srcImagePath,imageX,imageY,imageW,imageH);
System.out.println("==========imageCutEnd=============");
}
}
return "user/uploadImg/test";
}
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五、ImageCut.java工具类：
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/**
* 截取图片
* @param srcImageFile 原图片地址
* @param x 截取时的x坐标
* @param y 截取时的y坐标
* @param desWidth 截取的宽度
* @param desHeight 截取的高度
*/
public static void imgCut(String srcImageFile, int x, int y, int desWidth,
int desHeight) {
try {
Image img;
ImageFilter cropFilter;
BufferedImage bi = ImageIO.read(new File(srcImageFile+"_src.jpg"));
int srcWidth = bi.getWidth();
int srcHeight = bi.getHeight();
if (srcWidth >= desWidth && srcHeight >= desHeight) {
Image image = bi.getScaledInstance(srcWidth, srcHeight,Image.SCALE_DEFAULT);
cropFilter = new CropImageFilter(x, y, desWidth, desHeight);
img = Toolkit.getDefaultToolkit().createImage(
new FilteredImageSource(image.getSource(), cropFilter));
BufferedImage tag = new BufferedImage(desWidth, desHeight,
BufferedImage.TYPE_INT_RGB);
Graphics g = tag.getGraphics();
g.drawImage(img, 0, 0, null);
g.dispose();
//输出文件
ImageIO.write(tag, "JPEG", new File(srcImageFile+"_cut.jpg"));
}
} catch (Exception e) {
e.printStackTrace();
}
}
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六、jcrop的两种使用方式：
1、
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jQuery('#cropbox').Jcrop({
onChange: showCoords,
onSelect: showCoords
});
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2、
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var api = $.Jcrop('#cropbox',{
onChange: showPreview,
onSelect: showPreview,
aspectRatio: 1
});
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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服务器之家。