简单实现Android文件上传

文件上传在B/S应用中是一种十分常见的功能，那么在Android平台下是否可以实现像B/S那样的文件上传功能呢？答案是肯定的。下面是一个模拟网站程序上传文件的例子。

首先新建一个Android工程，新建主启动Activity：

MainActivity.java：

package com.xzq.upload;

import java.io.DataOutputStream;
import java.io.FileInputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity{

 private String newName = "htys.mp3";
 //要上传的本地文件路径
 private String uploadFile = "/data/data/com.xzq/htys.mp3";
 //上传到服务器的指定位置
 private String actionUrl = "http://192.168.100.100:8080/upload/upload.jsp";
 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.myText2);
  mTextView1.setText("FilePath：/n" + uploadFile);
  mTextView2 = (TextView) findViewById(R.id.myText3);
  mTextView2.setText("UploadPath：/n" + actionUrl);
  /* 设定mButton的onClick事件处理 */
  mButton1 = (Button) findViewById(R.id.myButton);
  mButton1.setOnClickListener(new View.OnClickListener(){
   public void onClick(View v){
    uploadFile();
   }
  });
 }

 private void uploadFile(){
  String end = "/r/n";
  String Hyphens = "--";
  String boundary = "*****";
  try{
   URL url = new URL(actionUrl);
   HttpURLConnection con = (HttpURLConnection) url.openConnection();
   /* 允许Input、Output，不使用Cache */
   con.setDoInput(true);
   con.setDoOutput(true);
   con.setUseCaches(false);
   /* 设定传送的method=POST */
   con.setRequestMethod("POST");
   /* setRequestProperty */
   con.setRequestProperty("Connection", "Keep-Alive");
   con.setRequestProperty("Charset", "UTF-8");
   con.setRequestProperty("Content-Type",
     "multipart/form-data;boundary=" + boundary);
   /* 设定DataOutputStream */
   DataOutputStream ds = new DataOutputStream(con.getOutputStream());
   ds.writeBytes(Hyphens + boundary + end);
   ds.writeBytes("Content-Disposition: form-data; "
     + "name=/"file1/";filename=/"" + newName + "/"" + end);
   ds.writeBytes(end);
   /* 取得文件的FileInputStream */
   FileInputStream fStream = new FileInputStream(uploadFile);
   /* 设定每次写入1024bytes */
   int bufferSize = 1024;
   byte[] buffer = new byte[bufferSize];
   int length = -1;
   /* 从文件读取数据到缓冲区 */
   while ((length = fStream.read(buffer)) != -1){
    /* 将数据写入DataOutputStream中 */
    ds.write(buffer, 0, length);
   }
   ds.writeBytes(end);
   ds.writeBytes(Hyphens + boundary + Hyphens + end);
   fStream.close();
   ds.flush();
   /* 取得Response内容 */
   InputStream is = con.getInputStream();
   int ch;
   StringBuffer b = new StringBuffer();
   while ((ch = is.read()) != -1){
    b.append((char) ch);
   }
   System.out.println("上传成功");
   Toast.makeText(MainActivity.this, "上传成功", Toast.LENGTH_LONG)
     .show();
   ds.close();
  } catch (Exception e){
   System.out.println("上传失败" + e.getMessage());
   Toast.makeText(MainActivity.this, "上传失败" + e.getMessage(),
     Toast.LENGTH_LONG).show();
  }
 }
}

最后别忘了在AndroidManifest.xml中设置访问Internet的权限：

<uses-permission android:name="android.permission.INTERNET" />

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持我们。