android 上传文件到服务器代码实例

 Android对于上传文件，还是很简单的，和java里面的上传都是一样的，基本上都是熟悉操作输出流和输入流！还有一个特别重要的就是需要一些content-type这些参数的配置！  如果这些都弄好了，上传就很简单了！   下面是我写的一个上传的工具类：
代码如下:
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;

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
   
    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)
            {
               
                DataOutputStream dos = new DataOutputStream( conn.getOutputStream());
                StringBuffer sb = new StringBuffer();
                sb.append(PREFIX);
                sb.append(BOUNDARY);
                sb.append(LINE_END);
               
                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();
               
                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 ;
  &nbs p;                 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;
    }
}

参数就一个File文件和一个请求上传的URL，不过需要注意的是   ，因为需要用到了网络请求，所以大家可不要忘记在上传的时候，给android客户端加一个访问王珞丹呃权限哦！  

 还有一点就是需要大家注意一下：本人是做服务器端javaEE的，我发现在上传的过程中，如果文件的标识name是java关键字之类的，上传过程中，会存在很多位置的问题的！所以大家经可能的不要使用关键字哦！

下面是Activity的代码：

代码如下:
package com.spring.sky.image.upload;

import java.io.File;

import com.spring.sky.image.upload.network.UploadUtil;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.ContentResolver;
import android.content.DialogInterface;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;

public class MainActivity extends Activity implements OnClickListener{
    private static final String TAG = "uploadImage";
    private static String requestURL = "http://192.168.1.14:8080/SetBlobData/img!up";
    private Button selectImage,uploadImage;
    private ImageView imageView;
    private String picPath = null;
   
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        selectImage = (Button) this.findViewById(R.id.selectImage);
        uploadImage = (Button) this.findViewById(R.id.uploadImage);
        selectImage.setOnClickListener(this);
        uploadImage.setOnClickListener(this);
        imageView = (ImageView) this.findViewById(R.id.imageView);
       
    }
    @Override
    public void onClick(View v) {
        switch (v.getId()) {
        case R.id.selectImage:
           
            Intent intent = new Intent();
            intent.setType("image
            Uri uri = data.getData();
            Log.e(TAG, "uri = "+ uri);
            try {
                String[] pojo = {MediaStore.Images.Media.DATA};
                Cursor cursor = managedQuery(uri, pojo, null, null,null);
                if(cursor!=null)
                {
                    ContentResolver cr = this.getContentResolver();
                    int colunm_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
                    cursor.moveToFirst();
                    String path = cursor.getString(colunm_index);
                   
                    if(path.endsWith("jpg")||path.endsWith("png"))
                    {
                        picPath = path;
                        Bitmap bitmap = BitmapFactory.decodeStream(cr.openInputStream(uri));
                        imageView.setImageBitmap(bitmap);
                    }else{alert();}
                }else{alert();}
            } catch (Exception e) {
            }
        }
     & nbsp;  super.onActivityResult(requestCode, resultCode, data);
    }
    private void alert()
    {
        Dialog dialog = new AlertDialog.Builder(this)
        .setTitle("提示")
        .setMessage("您选择的不是有效的图片")
        .setPositiveButton("确定",
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog,
                            int which) {
                        picPath = null;
                    }
                })
        .create();
        dialog.show();
    }
}

layout代码：
代码如下:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
    <Button 
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="选择图片"
    android:id="@+id/selectImage"
    />
    <Button 
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="上传图片"
    android:id="@+id/uploadImage"
    />
     <ImageView 
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/imageView"
    />
</LinearLayout>

以上就是android 上传图片的全部代码，如果想上传其他文件的话，可以修改过滤条件就可以了，同时文件的类型一定要和服务器端的文件类型保持一致，否则上传就失败了！

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