原理
android客户端模拟一个http的post请求到服务器端，服务器端接收相应的post请求后，返回响应信息给给客户端。
背景
网上很多上传到java服务器上的，找了好久，找到了上传到php的了，思路跟我当初想的差不多，就是post过去。废话不多说，直接上图看代码。
php代码
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<?php$target_path = "./upload/";//接收文件目录$target_path = $target_path . basename( $_files['uploadedfile']['name']);if(move_uploaded_file($_files['uploadedfile']['tmp_name'], $target_path)) {echo "the file ". basename( $_files['uploadedfile']['name']). " has been uploaded";} else{echo "there was an error uploading the file, please try again!" . $_files['uploadedfile']['error'];}?> |
android代码
上传的主要代码:
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private void uploadfile(string uploadurl){string end = " ";string twohyphens = "--";string boundary = "******";try{url url = new url(uploadurl);httpurlconnection httpurlconnection = (httpurlconnection) url.openconnection();//http连接// 设置每次传输的流大小，可以有效防止手机因为内存不足崩溃// 此方法用于在预先不知道内容长度时启用没有进行内部缓冲的 http 请求正文的流。httpurlconnection.setchunkedstreamingmode(128 * 1024);// 128k// 允许输入输出流httpurlconnection.setdoinput(true);httpurlconnection.setdooutput(true);httpurlconnection.setusecaches(false);// 使用post方法httpurlconnection.setrequestmethod("post");httpurlconnection.setrequestproperty("connection", "keep-alive");//保持一直连接httpurlconnection.setrequestproperty("charset", "utf-8");//编码httpurlconnection.setrequestproperty("content-type","multipart/form-data;boundary=" + boundary);//post传递过去的编码dataoutputstream dos = new dataoutputstream(httpurlconnection.getoutputstream());//输出流dos.writebytes(twohyphens + boundary + end);dos.writebytes("content-disposition: form-data; name="uploadedfile"; filename=""+ srcpath.substring(srcpath.lastindexof("/") + 1)+ """+ end);dos.writebytes(end);fileinputstream fis = new fileinputstream(srcpath);//文件输入流，写入到内存中byte[] buffer = new byte[8192]; // 8kint count = 0;// 读取文件while ((count = fis.read(buffer)) != -1){dos.write(buffer, 0, count);}fis.close();dos.writebytes(end);dos.writebytes(twohyphens + boundary + twohyphens + end);dos.flush();inputstream is = httpurlconnection.getinputstream();//http输入，即得到返回的结果inputstreamreader isr = new inputstreamreader(is, "utf-8");bufferedreader br = new bufferedreader(isr);string result = br.readline();toast.maketext(this, result, toast.length_long).show();//将结果输出dos.close();is.close();} catch (exception e){e.printstacktrace();settitle(e.getmessage());}} |
因为安卓4.0之后耗时间的操作要求都在非ui线程中操作，即将前面的asynctask拿来用了吧~
asynctask传送门：http://www.zzvips.com/article/159411.html
在这个类中，将上传的操作放在doinbackground当中，可以有progressdialog显示上传了多少：
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// read filebytesread = fileinputstream.read(buffer, 0, buffersize);while (bytesread > 0) {outputstream.write(buffer, 0, buffersize);length += buffersize;progress = (int) ((length * 100) / totalsize);publishprogress(progress);bytesavailable = fileinputstream.available();buffersize = math.min(bytesavailable, maxbuffersize);bytesread = fileinputstream.read(buffer, 0, buffersize);}outputstream.writebytes(lineend);outputstream.writebytes(twohyphens + boundary + twohyphens+ lineend);publishprogress(100); |
还有就是，注意权限哟：
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<uses-permission android:name="android.permission.internet" /> |
以上内容给大家介绍了android异步上传图片到php服务器，希望本文分享能够给大家带来帮助。
