思路：onchange()事件触发异步请求，js将成功后返回图片的地址动态写入
JSP页面： 外层一个ID为myForm的表单
*上传产品图片(XX尺寸)：注:该尺寸图片必须为90x150。
请上传图片的大小不超过3MB
JS函数
function submitImgSize1Upload() {
var option = {
url:"${path}/upload/upload.do",//使用ajax的方式提交表单，url以option中为准
type:'post',
dataType:"text",//不要写成dateType
data:{
fileName:'imgSize1File'
},
success:function(responseText){
//把字符串解析成json对象
var obj = $.parseJSON(responseText);
$("#imgSize1ImgSrc").attr("src", obj.realPath);
$("#imgSize1").val(obj.relativePath);
},
error:function(){
alert("系统错误");
}
};
$("#myForm").ajaxSubmit(option);
}
控制层：
import com.sun.jersey.api.client.Client;
import com.sun.jersey.api.client.WebResource;
@RequestMapping("/upload.do")
public void upload(String fileName, HttpServletRequest request, PrintWriter out){
MultipartHttpServletRequest mr = (MultipartHttpServletRequest) request;
CommonsMultipartFile cfile = (CommonsMultipartFile) mr.getFile(fileName);
byte[] fbyte = cfile.getBytes();
String imageName = "";
SimpleDateFormat format = new SimpleDateFormat("yyyyMMddHHmmssSSS");
imageName = format.format(new Date());
Random random = new Random();
for(int i =0; i < 3; i++){
imageName = imageName + random.nextInt(10);
}
String raginalFileName = cfile.getOriginalFilename();
String suffixName = raginalFileName.substring(raginalFileName.lastIndexOf("."));
//创建客户端
Client client = Client.create();
//图片在图片服务器上的绝对路径
String imagePath = EcpsConstants.UPLOAD_PATH+"/upload/"+imageName+suffixName;
WebResource resource = client.resource(imagePath);
//把图片放到图片服务器上
resource.put(String.class, fbyte);
String result = "{\"realPath\":\""+imagePath+"\", \"relativePath\":\""+"/upload/"+imageName+suffixName+"\"}";
out.write(result);
out.close();
}
原文：http://blog.csdn.net/ojackhao/article/details/45190049