android 上传文件到 spring 搭建的后台

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android

项目后台是用Spring搭建的，上传图片一直不行，最后的最后终于解决了，记下了，以后还会用的着。
android端上传方法：

/**
   * 上传参数和文件
   * @param url
   * @param paramters
   * @param filesMap
   * @return
   * @throws Exception
   */
public static String uploadFile2(String url, Map<String, String> paramters,
Map<String, File> filesMap) throws Exception {
System.out.println("uploadFile2---------------");
HttpClient httpClient = new DefaultHttpClient();
httpClient.getParams().setParameter(
CoreProtocolPNames.PROTOCOL_VERSION, HttpVersion.HTTP_1_1);
/* 建立HTTPPost对象 */
HttpPost httpRequest = new HttpPost(url);
String strResult = "doPostError";
// 文件传输
MultipartEntity mEntity = new MultipartEntity();
//添加上传参数
for (Map.Entry<String, String> entry : paramters.entrySet()) {
ContentBody strBody = new StringBody(entry.getValue());
mEntity.addPart(entry.getKey(), strBody);
}

            //添加上传的文件
Iterator<String> iterator = filesMap.keySet().iterator();
while (iterator.hasNext()) {
String fileName = iterator.next();
ContentBody cBody = new FileBody(filesMap.get(fileName));
mEntity.addPart(fileName, cBody);
System.out.println("while-----iterator fileName:"+fileName+"  file:"+filesMap.get(fileName));
}
System.out.println("file length----->" + mEntity.getContentLength());
httpRequest.setEntity(mEntity);
/* 发送请求并等待响应 */
HttpResponse httpResponse = httpClient.execute(httpRequest);
/* 若状态码为200 ok */
if (httpResponse.getStatusLine().getStatusCode() == 200) {
/* 读返回数据 */
strResult = EntityUtils.toString(httpResponse.getEntity());
} else {
strResult = "Error Response: "
+ httpResponse.getStatusLine().toString();
}
// 关闭连接
httpClient.getConnectionManager().shutdown();
return strResult;

}

没什么好说的不过多解释。

后台原来的接收文件方法：
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
System.out.println("do post");
// 设置request编码，主要是为了处理普通输入框中的中文问题
request.setCharacterEncoding("utf-8");
System.out.println("ShareCon----->request:"
+ request.getAttributeNames().toString());
Enumeration enumeration = request.getAttributeNames();
while (enumeration.hasMoreElements()) {
Object object = enumeration.nextElement();
System.out.println("enum----->" + object.toString());
}
// 这里对request进行封装，RequestContext提供了对request多个访问方法
org.apache.commons.fileupload.RequestContext requestContext = new ServletRequestContext(
request);
// 判断表单是否是Multipart类型的。这里可以直接对request进行判断，不过已经以前的用法了
if (FileUpload.isMultipartContent(requestContext)) {

PrintWriter out = response.getWriter();
// String savePath = getSavePath(request);
String pathroot = this.getClass().getClassLoader().getResource("/")
.getPath();
String path = pathroot.substring(1, pathroot.length() - 8)
+ "resources/img";
path = java.net.URLDecoder.decode(path, "UTF-8");
String savePath = path;
DiskFileItemFactory factory = new DiskFileItemFactory();
// 设置文件的缓存路径
factory.setRepository(new File(savePath));
File dir = new File(savePath);
if (!dir.exists()) {
dir.mkdirs();
}
// System.out.print("已经生成临时文件");

ServletFileUpload upload = new ServletFileUpload(factory);
// 设置上传文件大小的上限，-1表示无上限
upload.setSizeMax(100000 * 1024 * 1024);
List items = new ArrayList();
try {
// 上传文件，并解析出所有的表单字段，包括普通字段和文件字段
items = upload.parseRequest(request);
System.out.println("items------->" + items.size());
} catch (FileUploadException e1) {
System.out.println("文件上传发生错误" + e1.getMessage());
}
// 下面对每个字段进行处理，分普通字段和文件字段
Iterator it = items.iterator();
System.out.println("sc-------it----");
while (it.hasNext()) {
System.out.println("it=" + it);
DiskFileItem fileItem = (DiskFileItem) it.next();
// 如果是普通字段
if (fileItem.isFormField()) {
System.out.println(fileItem.getFieldName()
+ " "
+ fileItem.getName()
+ " "
+ new String(fileItem.getString().getBytes(
"iso8859-1"), "gbk"));
} else {
System.out.println(fileItem.getFieldName() + " "
+ fileItem.getName() + " "
+ fileItem.isInMemory() + " "
+ fileItem.getContentType() + " "
+ fileItem.getSize());
// 保存文件，其实就是把缓存里的数据写到目标路径下
if (fileItem.getName() != null && fileItem.getSize() != 0) {
File fullFile = new File(fileItem.getName());
String fileName = getFileName(request, fileItem
.getName());
File newFile = new File(savePath + fileName);
try {
fileItem.write(newFile);
} catch (Exception e) {
e.printStackTrace();
out.print("{\"error\":\"upload error!\"}");
}
out.print("{\"url\":\"/upload/" + fileName + "\"}");
} else {
System.out.println("文件没有选择或文件内容为空");
}
}
}
}
}

items = upload.parseRequest(request); 得到的item的长度一直为0 ，上网找了找，试了一些方法，都没解决。
最后改成了这样
@RequestMapping(value = "/upload_pic", method = RequestMethod.POST)
@ResponseBody
public void uploadFile(HttpServletRequest request,
HttpServletResponse response,int id) throws IOException {
System.out.println("uploadFile------>");
DefaultMultipartHttpServletRequest req = (DefaultMultipartHttpServletRequest) request;
request.setCharacterEncoding("UTF-8");
Map<String, MultipartFile> files = req.getFileMap();
String pathroot = this.getClass().getClassLoader().getResource("/")
.getPath();
String path = pathroot.substring(1, pathroot.length() - 8)
+ "resources/img/";
for (String key : files.keySet()) {
MultipartFile file = files.get(key);
System.out.println(file.getName());
System.out.println(file.getSize());
FileOutputStream fileOutput;
path = java.net.URLDecoder.decode(path, "UTF-8");
String fileName = path+key;
System.out.println("save_path:"+fileName);
try {
fileOutput = new FileOutputStream(fileName);
fileOutput.write(file.getBytes());
fileOutput.flush();
fileOutput.close();
String filename = "xxxxxxxxxxxxxxxxxxx";
int nums = shareService.addSharePic(id,filename);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}

解决问题

         // 转型为MultipartHttpRequest
         MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
         // 根据前台的name名称得到上传的文件   "file" 是前端的参数名，值就是文件对象 File
         MultipartFile file = multipartRequest.getFile("file");

String fileName = file.getOriginalFilename();

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