SpringMVC结合Jcrop实现图片裁剪

<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> 

<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> 

<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> 

@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"; 
  } 

/** 
   * 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(); 
    } 
  } 

jquery('#cropbox').jcrop({
         onchange: showcoords,
         onselect: showcoords
      });

var api = $.jcrop('#cropbox',{
         onchange: showpreview,
         onselect: showpreview,
         aspectratio: 1
      });