前台代码

上传图片按钮

选择图片

隐藏的文件选择器

图片预览

去除图片预览未选择时默认时的边框

img[src=""],img:not([src]){

opacity:0;

}

JavaScript部分

function uploadPhoto() {

$("#photoFile").click();

}

/**

* 上传图片

*/

function upload() {

if ($("#photoFile").val() == '') {

return;

}

var formData = new FormData();

formData.append('photo', document.getElementById('photoFile').files[0]);

$.ajax({

url:"${pageContext.request.contextPath}/system/uploadPhoto",

type:"post",

data: formData,

contentType: false,

processData: false,

success: function(data) {

if (data.type == "success") {

$("#preview_photo").attr("src", data.filepath+data.filename);

$("#productImg").val(data.filename);

} else {

alert(data.msg);

}

},

error:function(data) {

alert("上传失败")

}

});

}

后台代码

/**

* 图片上传

* @param photo

* @param request

* @return

*/

@RequestMapping(value = "/uploadPhoto", method = RequestMethod.POST)

@ResponseBody

public Map uploadPhoto(MultipartFile photo, HttpServletRequest request) {

Map ret = new HashMap();

if (photo == null) {

ret.put("type", "error");

ret.put("msg", "选择要上传的文件！");

return ret;

}

if (photo.getSize() > 1024 * 1024 * 10) {

ret.put("type", "error");

ret.put("msg", "文件大小不能超过10M！");

return ret;

}

//获取文件后缀

String suffix = photo.getOriginalFilename().substring(photo.getOriginalFilename().lastIndexOf(".") + 1, photo.getOriginalFilename().length());

if (!"jpg,jpeg,gif,png".toUpperCase().contains(suffix.toUpperCase())) {

ret.put("type", "error");

ret.put("msg", "请选择jpg,jpeg,gif,png格式的图片！");

return ret;

}

//获取项目根目录加上图片目录 webapp/static/imgages/upload/

String savePath = request.getSession().getServletContext().getRealPath("/") + "/static/images/upload/";

File savePathFile = new File(savePath);

if (!savePathFile.exists()) {

//若不存在该目录，则创建目录

savePathFile.mkdir();

}

String filename = new Date().getTime() + "." + suffix;

try {

//将文件保存指定目录

photo.transferTo(new File(savePath + filename));

} catch (Exception e) {

ret.put("type", "error");

ret.put("msg", "保存文件异常！");

e.printStackTrace();

return ret;

}

ret.put("type", "success");

ret.put("msg", "上传图片成功！");

ret.put("filepath", request.getSession().getServletContext().getContextPath() + "/static/images/upload/");

ret.put("filename", filename);

return ret;

}