转：http://blog.csdn.net/explorerqp/article/details/7283295

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：

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1. </pre><prename="code"class="java">importjava.io.BufferedReader;
2. importjava.io.DataOutputStream;
3. importjava.io.File;
4. importjava.io.FileInputStream;
5. importjava.io.InputStream;
6. importjava.io.InputStreamReader;
7. importjava.net.HttpURLConnection;
8. importjava.net.URL;
9. importandroid.app.Activity;
10. importandroid.os.Bundle;
11. importandroid.os.Environment;
12. importandroid.util.Log;
13. importandroid.view.View;
14. importandroid.widget.Button;
15. importandroid.widget.TextView;
16. importandroid.widget.Toast;
18. publicclassmainActivityextendsActivity{
19. /*
20. *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
21. */
23. privateStringsrcPath=Environment.getExternalStorageDirectory().getAbsolutePath()+File.separator+"download"+
24. File.separator+"tilocal.jpeg";
26. privateStringnewName="tilocal.jpeg";
27. //要上传的本地文件路径
28. privateStringuploadFile=Environment.getExternalStorageDirectory().getAbsolutePath()+File.separator+"download"+
29. File.separator+"tilocal.jpeg";
30. //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)
31. //privateStringactionUrl="http://192.168.3.10:8080//android/customer/upLoad.action";

</pre><pre name="code" class="java">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";

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1. privateTextViewmTextView1;

private TextView mTextView1;

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1. privateTextViewmTextView2;
2. privateButtonmButton1;
4. @Override
5. publicvoidonCreate(BundlesavedInstanceState)
6. {
7. super.onCreate(savedInstanceState);
8. setContentView(R.layout.main);
9. mTextView1=(TextView)findViewById(R.id.mTextView1);
10. mTextView1.setText("FilePath：/n"+uploadFile);
11. mTextView2=(TextView)findViewById(R.id.mTextView2);
12. //mTextView2.setText("UploadPath：/n"+actionUrl);
13. /*设定mButton的onClick事件处理*/
14. mButton1=(Button)findViewById(R.id.mButton1);
15. mButton1.setOnClickListener(newView.OnClickListener()
16. {
17. publicvoidonClick(Viewv)
18. {
19. uploadFile();
20. }
21. });
22. }
25. privatevoiduploadFile(){
27. StringuploadUrl="http://10.0.2.2:8080/upLoadFile/servlet/UpLoadFile";
28. Stringend="\r\n";
29. StringtwoHyphens="--";
30. Stringboundary="******";
31. try{
32. URLurl=newURL(uploadUrl);
33. HttpURLConnectionhttpURLConnection=(HttpURLConnection)url.openConnection();
34. httpURLConnection.setDoInput(true);
35. httpURLConnection.setDoOutput(true);
36. httpURLConnection.setUseCaches(false);
37. httpURLConnection.setRequestMethod("POST");
38. httpURLConnection.setRequestProperty("Connection","Keep-Alive");
39. httpURLConnection.setRequestProperty("Charset","UTF-8");
40. httpURLConnection.setRequestProperty("Content-Type","multipart/form-data;boundary="+boundary);
42. DataOutputStreamdos=newDataOutputStream(httpURLConnection.getOutputStream());
43. dos.writeBytes(twoHyphens+boundary+end);
44. dos.writeBytes("Content-Disposition:form-data;name=\"file\";filename=\""
45. +srcPath.substring(srcPath.lastIndexOf("/")+1)+"\""+end);
46. dos.writeBytes(end);
48. FileInputStreamfis=newFileInputStream(srcPath);
49. byte[]buffer=newbyte[8192];//8k
50. intcount=0;
51. while((count=fis.read(buffer))!=-1){
52. dos.write(buffer,0,count);
53. }
54. Log.e("",dos.size()+"----------");
55. fis.close();
57. dos.writeBytes(end);
58. dos.writeBytes(twoHyphens+boundary+twoHyphens+end);
59. dos.flush();
61. InputStreamis=httpURLConnection.getInputStream();
62. InputStreamReaderisr=newInputStreamReader(is,"utf-8");
63. BufferedReaderbr=newBufferedReader(isr);
64. Stringresult=br.readLine();
66. Toast.makeText(this,result,Toast.LENGTH_LONG).show();
67. dos.close();
68. is.close();
70. }catch(Exceptione){
71. e.printStackTrace();
72. setTitle(e.getMessage());
73. }
75. }
77. }

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：

[java] view plain copy print ?

1. importjava.io.FileOutputStream;
2. importjava.io.IOException;
3. importjavax.servlet.ServletException;
4. importjavax.servlet.ServletInputStream;
5. importjavax.servlet.http.HttpServlet;
6. importjavax.servlet.http.HttpServletRequest;
7. importjavax.servlet.http.HttpServletResponse;

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;

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[java] view plain copy print ?

[java] view plain copy print ?

1. publicvoiddoPost(HttpServletRequestrequest,HttpServletResponseresponse)
2. throwsServletException,IOException{
4. //获取输入流，是HTTP协议中的实体内容
5. ServletInputStreamin=request.getInputStream();
6. //缓冲区
7. bytebuffer[]=newbyte[1024];
8. //写入服务器端固定路径磁盘中
9. FileOutputStreamout=newFileOutputStream("F:\\upload\\zzz.jpeg");
11. intlen=in.read(buffer,0,1024);
13. //把流里的信息循环读入到file文件中
14. System.out.println(len+"+++++++++++++");
15. while(len!=-1){
16. System.out.println(len+"----------");
17. out.write(buffer,0,len);
18. len=in.readLine(buffer,0,1024);
19. }
21. out.close();
23. in.close();
24. }

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。

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