学步园

最近在做一个android名片管理系统的demo，主要功能是与服务器端通信上传及下载数据。

android访问服务器端下载基本没什么问题，但是android上传到服务器遇到瓶颈。

android上传文件以数据流的形式上传，所以采用模拟http请求将文件以数据流的形式上传到服务器端，代码如下：

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class mainActivity extends Activity {
  /* 
  * 变量声明 filename：上传后在服务器上的文件名称 uploadFile：要上传的文件路径 actionUrl：服务器上对应的程序路径 
  */  

private String srcPath = Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator+"download"+
		  File.separator+"tilocal.jpeg";  

  private String newName = "tilocal.jpeg";
  //要上传的本地文件路径
  private String uploadFile = Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator+"download"+
  File.separator+"tilocal.jpeg";
  //上传到服务器的指定位置(废弃，在uploadFile方法中写访问服务器路径)
  //private String actionUrl = "http://192.168.3.10:8080//android/customer/upLoad.action";

  private TextView mTextView1;

  private TextView mTextView2;
  private Button mButton1;
 
  @Override
  public void onCreate(Bundle savedInstanceState)
  {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    mTextView1 = (TextView) findViewById(R.id.mTextView1);
    mTextView1.setText("FilePath：/n " + uploadFile);
    mTextView2 = (TextView) findViewById(R.id.mTextView2);
    //mTextView2.setText("UploadPath：/n " + actionUrl);
    /* 设定mButton的onClick事件处理 */
    mButton1 = (Button) findViewById(R.id.mButton1);
    mButton1.setOnClickListener(new View.OnClickListener()
    {
      public void onClick(View v)
      {
    	  uploadFile();
      }
    });
  }


private void uploadFile() {  
    
	  String uploadUrl = "http://10.0.2.2:8080/upLoadFile/servlet/UpLoadFile";  
	  String end = "\r\n";  
	  String twoHyphens = "--";  
	  String boundary = "******";  
	  try {  
		  URL url = new URL(uploadUrl);  
		  HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();  
		  httpURLConnection.setDoInput(true);  
		  httpURLConnection.setDoOutput(true);  
		  httpURLConnection.setUseCaches(false);  
		  httpURLConnection.setRequestMethod("POST");  
		  httpURLConnection.setRequestProperty("Connection", "Keep-Alive");  
		  httpURLConnection.setRequestProperty("Charset", "UTF-8");  
		  httpURLConnection.setRequestProperty("Content-Type","multipart/form-data;boundary=" + boundary);  
		    
		  DataOutputStream dos = new DataOutputStream(httpURLConnection.getOutputStream());  
		  dos.writeBytes(twoHyphens + boundary + end);  
		  dos.writeBytes("Content-Disposition: form-data; name=\"file\"; filename=\""  
		  + srcPath.substring(srcPath.lastIndexOf("/") + 1) + "\"" + end);  
		  dos.writeBytes(end);  
		    
		  FileInputStream fis = new FileInputStream(srcPath);  
		  byte[] buffer = new byte[8192]; // 8k  
		  int count = 0;  
		  while ((count = fis.read(buffer)) != -1) {  
			  dos.write(buffer, 0, count);  
		  }
		  Log.e("", dos.size()+"----------");
		  fis.close();  
		    
		  dos.writeBytes(end);  
		  dos.writeBytes(twoHyphens + boundary + twoHyphens + end);  
		  dos.flush();  
		    
		  InputStream is = httpURLConnection.getInputStream();  
		  InputStreamReader isr = new InputStreamReader(is, "utf-8");  
		  BufferedReader br = new BufferedReader(isr);  
		  String result = br.readLine();  
		    
		  Toast.makeText(this, result, Toast.LENGTH_LONG).show();  
		  dos.close();  
		  is.close();  
	    
	  } catch (Exception e) {  
		  e.printStackTrace();  
		  setTitle(e.getMessage());  
	  }  
    
  }  
  
}

以上代码为android模拟http协议上传文件，以数据流的形式上传。

下面为服务器端servlet接收代码：

import java.io.FileOutputStream;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		
		//获取输入流，是HTTP协议中的实体内容
		ServletInputStream  in=request.getInputStream();
		//缓冲区
		byte buffer[]=new byte[1024];
		//写入服务器端固定路径磁盘中
		FileOutputStream out=new FileOutputStream("F:\\upload\\zzz.jpeg");
		
		int len=in.read(buffer, 0, 1024);
		
		//把流里的信息循环读入到file文件中
		System.out.println(len+"+++++++++++++");
		while( len!=-1 ){
			System.out.println(len+"----------");
			out.write(buffer, 0, len);
			len=in.readLine(buffer, 0, 1024);
			}
		
		out.close();
		
		in.close();
}

以上代码为粗糙的实现了android客户端与服务器端文件的上传功能。