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。