Android上传文件到服务器(1)

Android客户端经常有需要上传文件到服务器，国内的方法一般都是用非常底层的东西，创建一个HttpURLConnection，然后读取文件流，写到connection里，比如这个网址http://www.cnblogs.com/greatverve/archive/2011/12/23/android-upload.html上传文件：

package com.spring.sky.image.upload.network;import java.io.DataOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.IOException;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import java.util.UUID;import android.util.Log;/** *  * 上传工具类 * @author spring sky * Email:[e-mail] * QQ:840950105 * MyName:石明政 */public class UploadUtil {    private static final String TAG = "uploadFile";    private static final int TIME_OUT = 10*1000;   //超时时间    private static final String CHARSET = "utf-8"; //设置编码    /**     * android上传文件到服务器     * @param file  需要上传的文件     * @param RequestURL  请求的rul     * @return  返回响应的内容     */    public static String uploadFile(File file,String RequestURL)    {        String result = null;        String  BOUNDARY =  UUID.randomUUID().toString();  //边界标识   随机生成        String PREFIX = "--" , LINE_END = "\r\n";         String CONTENT_TYPE = "multipart/form-data";   //内容类型                try {            URL url = new URL(RequestURL);            HttpURLConnection conn = (HttpURLConnection) url.openConnection();            conn.setReadTimeout(TIME_OUT);            conn.setConnectTimeout(TIME_OUT);            conn.setDoInput(true);  //允许输入流            conn.setDoOutput(true); //允许输出流            conn.setUseCaches(false);  //不允许使用缓存            conn.setRequestMethod("POST");  //请求方式            conn.setRequestProperty("Charset", CHARSET);  //设置编码            conn.setRequestProperty("connection", "keep-alive");               conn.setRequestProperty("Content-Type", CONTENT_TYPE + ";boundary=" + BOUNDARY);                         if(file!=null)            {                /**                 * 当文件不为空，把文件包装并且上传                 */                DataOutputStream dos = new DataOutputStream( conn.getOutputStream());                StringBuffer sb = new StringBuffer();                sb.append(PREFIX);                sb.append(BOUNDARY);                sb.append(LINE_END);                /**                 * 这里重点注意：                 * name里面的值为服务器端需要key   只有这个key 才可以得到对应的文件                 * filename是文件的名字，包含后缀名的   比如:abc.png                   */                                sb.append("Content-Disposition: form-data; name=\"img\"; filename=\""+file.getName()+"\""+LINE_END);                 sb.append("Content-Type: application/octet-stream; charset="+CHARSET+LINE_END);                sb.append(LINE_END);                dos.write(sb.toString().getBytes());                InputStream is = new FileInputStream(file);                byte[] bytes = new byte[1024];                int len = 0;                while((len=is.read(bytes))!=-1)                {                    dos.write(bytes, 0, len);                }                is.close();                dos.write(LINE_END.getBytes());                byte[] end_data = (PREFIX+BOUNDARY+PREFIX+LINE_END).getBytes();                dos.write(end_data);                dos.flush();                /**                 * 获取响应码  200=成功                 * 当响应成功，获取响应的流                   */                int res = conn.getResponseCode();                  Log.e(TAG, "response code:"+res);//                if(res==200)//                {                    Log.e(TAG, "request success");                    InputStream input =  conn.getInputStream();                    StringBuffer sb1= new StringBuffer();                    int ss ;                    while((ss=input.read())!=-1)                    {                        sb1.append((char)ss);                    }                    result = sb1.toString();                    Log.e(TAG, "result : "+ result);//                }//                else{//                    Log.e(TAG, "request error");//                }            }        } catch (MalformedURLException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }        return result;    }}

下面分享一个高级层面的方法：使用HttpMime上传文件。

public static HttpResponse upload(String url, String fileName,  File file) throws ClientProtocolException, IOException{HttpClient client = new DefaultHttpClient();HttpParams httpParam = client.getParams();HttpConnectionParams.setConnectionTimeout(httpParam, 8000);HttpConnectionParams.setSoTimeout(httpParam, 8000);HttpPost request = new HttpPost(url);MultipartEntity entity = new MultipartEntity();entity.addPart(fileName, new FileBody(file));request.setEntity(entity);return client.execute(request, localContext);}

是不是非常简单？

HttpMime的jar包下载地址http://www.java2s.com/Code/Jar/h/Downloadhttpmime412jar.htm， 大家可以导入到项目的Libraries里边，再在Order and Export勾选上里边的HttpMime。

如果想上传文件的时候再POST参数，应该怎么办？没问题，上代码：

public static HttpResponse upload(String url, String fileName,  File file, List<NameValuePair> params) throws ClientProtocolException, IOException{HttpClient client = new DefaultHttpClient();HttpParams httpParam = client.getParams();HttpConnectionParams.setConnectionTimeout(httpParam, 8000);HttpConnectionParams.setSoTimeout(httpParam, 8000);HttpPost request = new HttpPost(url);MultipartEntity entity = new MultipartEntity();entity.addPart(fileName, new FileBody(file));if (null != params) {for (int i = 0; i < params.size(); i++) {BasicNameValuePair param = (BasicNameValuePair) params.get(i);entity.addPart(param.getName(),new StringBody(param.getValue()));}}request.setEntity(entity);return client.execute(request, localContext);}