安卓日记——利用http上传文件到服务器

利用安卓上传文件到服务器首先你要有服务器，第二你要有个处理上传文件的后台

建议自己先学习使用tomcat服务器自己想办法

可以用tomcat把自己电脑变为服务器（不过手机和电脑要在用一个局域网而且地址用cmd然后输入ipconfig找ipv4的，自己试试看吧）

我的后台采用jsp

下面是安卓源码

源码该备注的地方我都写好了，我也是借用别人写好的uploadutil，有兴趣可以研究，没兴趣的话会用就行

这个是mainactivity

package com.example.uploadpic;

import java.io.File;

import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.provider.MediaStore;
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.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener{
    private static final String TAG = "uploadImage";
    //这里写自己服务器后台的地址，后台源码会附上
    private static String requestURL = "http://119.29.136.149:8080/upload.jsp";
    private Button selectImage,uploadImage;
    private ImageView imageView;
    
    private String picPath = null;
    
    /** Called when the activity is first created. */
    @Override
    public void onCreate(final Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_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(final View v) {
        switch (v.getId()) {
        case R.id.selectImage:
            /***
             * 打开选择图片的工具
             * 想上传其他类型文件的用第三方文件浏览器
             */
            final Intent intent = new Intent();
            intent.setType("image/*");
            intent.setAction(Intent.ACTION_GET_CONTENT);
            startActivityForResult(intent, 1);
            break;
        case R.id.uploadImage:
            final File file = new File(picPath);
            if(file!=null)
            {
                
				//final String request = UploadUtil.uploadFile( file, requestURL);
				new AsyncTask<Void, Void, String>(){

					@Override
					protected String doInBackground(Void... arg0) {
						// TODO Auto-generated method stub
						final String request = UploadUtil.uploadFile( file, requestURL);
						return request;
					}
					
					protected void onPostExecute(String result) {

						uploadImage.setText(result);
					};
				}.execute();
				
            }
            break;
        default:
            break;
        }
    }

    @Override
    protected void onActivityResult(final int requestCode, final int resultCode, final Intent data) {
        if(resultCode==Activity.RESULT_OK)
        {
            final Uri uri = data.getData();
            Log.e(TAG, "uri = "+ uri);

                final String[] pojo = {MediaStore.Images.Media.DATA};

                final Cursor cursor = managedQuery(uri, pojo, null, null,null);
                if(cursor!=null)
                {
                    final ContentResolver cr = this.getContentResolver();
                    final int colunm_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
                    cursor.moveToFirst();
                    final String path = cursor.getString(colunm_index);
                    picPath = path;
                }
            }

        super.onActivityResult(requestCode, resultCode, data);
    }
    
}

下面是uploadutil

package com.example.uploadpic;

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
	    /**
	     * 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(final File file,final String RequestURL)
	    {
	        String result = null;
	        final String  BOUNDARY =  UUID.randomUUID().toString();  //边界标识   随机生成
	        final String PREFIX = "--" , LINE_END = "\r\n"; 
	        final String CONTENT_TYPE = "multipart/form-data";   //内容类型
	        
	        try {
	            final URL url = new URL(RequestURL);
	            final 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
	                 */
	                final DataOutputStream dos = new DataOutputStream( conn.getOutputStream());
	                final 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());
	                final InputStream is = new FileInputStream(file);
	                final 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());
	                final 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  
	                 */
	                final int res = conn.getResponseCode();  
	                Log.e(TAG, "response code:"+res);
	                if(res==200)
	                {
	                    Log.e(TAG, "request success");
	                    final InputStream input =  conn.getInputStream();
	                    final 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 (final MalformedURLException e) {
	            e.printStackTrace();
	        } catch (final IOException e) {
	            e.printStackTrace();
	        }
	        return result;
	    }
	}

下面是服务器jsp要用到两个库（commons-io-1.4.jar和commons-fileupload-1.2.1.jar）

我已经把服务器端的东西和安卓源码打包好（直接把upload文件夹拷贝到tomcat的webapps里就好，不知道我说什么的建议先去学习使用tomcat）

<%@ page language="java" pageEncoding="utf-8"%>
<%@ page import="java.io.*"%>
<%@ page import="java.util.*"%>
<%@ page import="java.net.*"%>
<%@ page import="org.apache.commons.fileupload.*"%>
<%@ page import="org.apache.commons.fileupload.servlet.*"%>
<%@ page import="org.apache.commons.fileupload.FileUploadBase.*"%>
<%@ page import="org.apache.commons.fileupload.disk.*"%>

<%
	String   fileName=null;
	String  t_ext=null;
	String  save_path=null;
	final long MAX_SIZE=5*1024*1024;
	String filepath=null;

	FileItemFactory factory=new DiskFileItemFactory();
	ServletFileUpload servletFileUpload =new ServletFileUpload(factory);
	servletFileUpload.setHeaderEncoding("UTF-8");
	servletFileUpload.setSizeMax(MAX_SIZE);

	List<FileItem>fileItemsList =servletFileUpload.parseRequest(request);
	if (fileItemsList!=null && fileItemsList.size()!=0) {
		Iterator fileItr =fileItemsList.iterator();
		while(fileItr.hasNext()){
			FileItem item =(FileItem)fileItr.next();
			if(item!=null && !item.isFormField()){
				fileName=item.getName();
				long size=item.getSize();
				if(!"".equals(fileName) && size!=0){
					fileName=fileName.substring(fileName.lastIndexOf("\\")+1);
					t_ext=fileName.substring(fileName.lastIndexOf(".")+1);
					//生成随机数名字
					String save_name="file"+UUID.randomUUID().toString()+"."+t_ext;
					filepath=save_name;
					save_path="/upload/"+save_name;
					File file=new File(request.getSession().getServletContext().getRealPath(save_path));
					if(!file.getParentFile().exists()){
						file.getParentFile().mkdirs();
					}
					
					item.write(file);
				}

			}
		}
		
	}
	response.setCharacterEncoding("UTF-8");
	response.setContentType("text/plain;charset=UTF-8");
	java.io.PrintWriter p=response.getWriter();
	// p.write("true");
	p.write(filepath);
	p.close();

%>

源码地址：https://github.com/jkgeekJack/UploadPic