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项目中我们可能会使用到异步上传并且有时需要是异步的，那么Ajaxfileupload是一个不错的选择,最近刚 做了一个多文件上传到远程服务器，远程服务器提供接口，当远程服务器上传结束后返回一个文件的服务器地址。分享出来给有需要的参考 下，Ajaxfileupload默认是一次只能上传一个文件的，所以需要稍稍修改下他的源码就可以上传多个文件，这里就不多说，百度一下自然就知道。
<input type="file" id="playeraddress" name="playeraddress" /> <input type="file" id="cover" name="cover" /> //这里就是两个file id自己定义
$.ajaxFileUpload({
url : web_path+'upload/upload.do',
secureuri : false,
data : data,//需要传递的数据 json格式
fileElementId :['playeraddress','cover'],
dataType : 'json',
success : function(data) {
//上传成功后的回调。
},
error : function(data) {
}
});
/**
*
*
* @param request
* @param response
* @param audioItem
* @return
*/
@RequestMapping(value = "/upload.do", method = { RequestMethod.POST })
@ResponseBody
public String addMusic(HttpServletRequest request,
HttpServletResponse response, AudioItem audioItem) {
//这里无需理会，这只是
String uploadFileUrl = GlobalUtil .getValue("upload_audioItem_audio_url");
String uploadIconUrl = GlobalUtil.getValue("upload_audioItem_pic_url");
CommonsMultipartResolver resolver = new CommonsMultipartResolver(
request.getServletContext());
if (resolver.isMultipart(request)) {
MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest) request;
// 取得request中的所有文件名
Iterator<String> iter = multiRequest.getFileNames();
while (iter.hasNext()) {
String fileName = iter.next();
// 取得上传文件
MultipartFile file = multiRequest.getFile(fileName);
/**
* 获取文件名
*/
String originalFilename = file.getOriginalFilename();
if ("playeraddress".equals(fileName)&&!"".equals(originalFilename)) {
try {
//这里的upload方法就是以http post的方式上传文件的 稍后贴出
String url = BaseService.upload(uploadFileUrl,
file.getOriginalFilename(),
file.getInputStream());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if ("cover".equals(fileName)&&!"".equals(originalFilename)){
try {
String icon = BaseService.upload(uploadIconUrl,
file.getOriginalFilename(),
file.getInputStream());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
//这里需要注意 使用Ajaxfileupload需要使用以下方式返回结果 回调不了success 方法
response.setContentType("text/html");
try {
response.getWriter().write("ok");
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}
//最后一步了
public static String upload(String httpurl, String fileName, InputStream inputStream) {
String result = "";
try {
//这里看你的网络环境 按需设置代理 正常都不需要理会
if (true) {
System.setProperty("http.proxyHost", BaseService.PROXY_IP);
System.setProperty("http.proxyPort", BaseService.PROXY_PORT);
}
String BOUNDARY = "---------7d4a6d158c9"; // 定义数据分隔线
URL url = new URL(httpurl);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
// 发送POST请求必须设置如下两行
conn.setDoOutput(true);
conn.setDoInput(true);
conn.setUseCaches(false);
conn.setRequestMethod("POST");
conn.setRequestProperty("connection", "Keep-Alive");
conn.setRequestProperty("user-agent",
"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)");
conn.setRequestProperty("Charsert", "UTF-8");
conn.setRequestProperty("Content-Type",
"multipart/form-data; boundary=" + BOUNDARY);
OutputStream out = new DataOutputStream(conn.getOutputStream());
byte[] end_data = ("\r\n--" + BOUNDARY + "--\r\n").getBytes();// 定义最后数据分隔线
StringBuilder sb = new StringBuilder();
sb.append("--");
sb.append(BOUNDARY);
sb.append("\r\n");
sb.append("Content-Disposition: form-data;name=\"file" + 1
+ "\";filename=\"" + fileName + "\"\r\n");
sb.append("Content-Type:application/octet-stream\r\n\r\n");
byte[] data = sb.toString().getBytes();
out.write(data);
DataInputStream in = new DataInputStream(inputStream);
int bytes = 0;
byte[] bufferOut = new byte[1024];
while ((bytes = in.read(bufferOut)) != -1) {
out.write(bufferOut, 0, bytes);
}
out.write("\r\n".getBytes()); // 多个文件时，二个文件之间加入这个
in.close();
out.write(end_data);
out.flush();
out.close();
// 定义BufferedReader输入流来读取URL的响应
BufferedReader reader = new BufferedReader(new InputStreamReader(
conn.getInputStream()));
String line = null;
while ((line = reader.readLine()) != null) {
result+=line;
}
} catch (Exception e) {
System.out.println("发送POST请求出现异常！" + e);
}
return new JSONObject(result).getString("url");
}
// 到这就结束了！希望能帮到你。
来自：http://my.oschina.net/pingdy/blog/361833