android的自带的httpClient(4.x) 怎么上传文件?报错

public static String post(AppContext appContext, String url, Map<String, String> params, File file)
			throws Exception{
		String userAgent = getUserAgent(appContext);
		String cookie = getCookie(appContext);


		MultipartEntityBuilder builder = MultipartEntityBuilder.create();
		builder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
		
		if(params != null){
			for(String key : params.keySet()){			//添加所有的文本字段
				builder.addTextBody(key, params.get(key));
			}
		}

		if(file != null){
			FileBody fileBody = new FileBody(file);
			builder.addPart("face", fileBody);
		}
		
		HttpClient httpClient= getHttpClient();
		HttpPost httpPost = getHttpPost(url, cookie, userAgent);
		HttpEntity entity = builder.build();
		httpPost.setEntity(entity);
		
		try {
			HttpResponse response = httpClient.execute(httpPost);
			if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK){
				String responseBody = EntityUtils.toString(response.getEntity());
				return responseBody;
			} else{
				throw new Exception("服务器错误");
			}
		} catch (IOException e) {
			e.printStackTrace();
			return null;
		}
		
	}

现在android自带的httpClient版本是4.X的，我看了开源中国的源码。里面很多的类都已经没了。

上网搜了大部分都是基于完整版的，android自带的好像没有一些类

上面的这段代码，运行时报错

02-16 18:58:33.923: E/AndroidRuntime(6813): FATAL EXCEPTION: Thread-4485
02-16 18:58:33.923: E/AndroidRuntime(6813): java.lang.NoClassDefFoundError: org.apache.http.entity.ContentType
02-16 18:58:33.923: E/AndroidRuntime(6813): at org.apache.http.entity.mime.MultipartEntityBuilder.addTextBody(MultipartEntityBuilder.java:148)
02-16 18:58:33.923: E/AndroidRuntime(6813): at com.gojob.app.net.NetworkVisitor.post(NetworkVisitor.java:219)
02-16 18:58:33.923: E/AndroidRuntime(6813): at com.gojob.app.net.NetworkVisitor.login(NetworkVisitor.java:150)
02-16 18:58:33.923: E/AndroidRuntime(6813): at com.gojob.app.fragment.LoginFragment$1$1.run(LoginFragment.java:68)

于是，我把httpmime.jar 加进来。他还需要httpcore.jar.

但是还是报错

02-16 18:37:10.617: E/AndroidRuntime(23166): FATAL EXCEPTION: Thread-5712
02-16 18:37:10.617: E/AndroidRuntime(23166): java.lang.NoSuchFieldError: org.apache.http.message.BasicHeaderValueFormatter.INSTANCE
02-16 18:37:10.617: E/AndroidRuntime(23166): at org.apache.http.entity.ContentType.toString(ContentType.java:153)
02-16 18:37:10.617: E/AndroidRuntime(23166): at org.apache.http.entity.mime.MultipartFormEntity.<init>(MultipartFormEntity.java:52)
02-16 18:37:10.617: E/AndroidRuntime(23166): at org.apache.http.entity.mime.MultipartEntityBuilder.buildEntity(MultipartEntityBuilder.java:226)
02-16 18:37:10.617: E/AndroidRuntime(23166): at org.apache.http.entity.mime.MultipartEntityBuilder.build(MultipartEntityBuilder.java:230)
02-16 18:37:10.617: E/AndroidRuntime(23166): at com.gojob.app.net.NetworkVisitor.post(NetworkVisitor.java:235)
02-16 18:37:10.617: E/AndroidRuntime(23166): at com.gojob.app.net.NetworkVisitor.regist(NetworkVisitor.java:205)
02-16 18:37:10.617: E/AndroidRuntime(23166): at com.gojob.app.fragment.RegistFragment$1$1.run(RegistFragment.java:74)

我上网搜索了一下，是因为android自带的和我加的冲突了。请问怎么解决？？？