ajax上传图片

<input type="file" value="上传图片" name="photo" id="uploadPhoto" >

<button class="btn btn-default" type="button" onclick="uploadFile()" value="上传"> 上传</button>

function uploadFile(){

if(!$("#uploadPhoto").val()){

alert("请选择需要上传的图片");

return false;

}

$.ajaxFileUpload ({

url: '../../../loadfile/uploadfile.action', //用于文件上传的服务器端请求地址

secureuri: false, //是否需要安全协议，一般设置为false

fileElementId: 'uploadPhoto', //文件上传域的ID

dataType: 'json', //返回值类型 一般设置为json

//服务器成功响应处理函数

success:function (data, status) {

alert(data);

$("#photonPk").val(data.message);

$("#showDevPic").attr("src","../../../loadfile/showPic.action?sysPk="+data.message)//取图片

},

//服务器响应失败处理函数

error:function (data, status, e){

alert("as:"+e);

}

} );

return false;

}

action中：

private File photo;

private List<String> fileContentType;

private SystemAttachmentService attachmentService;

private Long objectId;

private Long sysPk;

/get set 方法/

@Action("uploadfile")

public String upLoadPic() throws Exception {

SystemAttachment ssa = new SystemAttachment();

byte[] byte_photo = FileCopyUtils.copyToByteArray(getPhoto());

ssa.setContent(byte_photo);

ssa.setCreateTime(new Date());

ssa.setCreateUser(getCurrentUserCode());

ssa.setDeleteFlag(0l);

Long pk = attachmentService.saveSystemAttach(ssa);

getJson().put("message", pk);

return "forjson";

}

@Action("showPic")

public String showViewPic() {

OutputStream out = null;

SystemAttachment ss = null;

if(null!=objectId){

ss = attachmentService.querySysPicForObjectId(objectId);

}else{

ss = attachmentService.querySysPicForSyspk(sysPk);

}

try {

out = getHttpServletResponse().getOutputStream();

if (null != ss) {

try {

out.write(ss.getContent());

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}else{

out.write(attachmentService.querySysPicForObjectId(0l).getContent());

}

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} finally {

try {

out.flush();

out.close();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

return null;

}