android上传图片至服务器
16lz
2021-01-23
android上传图片至服务器
本实例实现了android上传手机图片至服务器，服务器进行保存
服务器servlet代码 publicvoid doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String temp=request.getSession().getServletContext().getRealPath("/")+"temp"; //临时目录 System.out.println("temp="+temp); String loadpath=request.getSession().getServletContext().getRealPath("/")+"Image"; //上传文件存放目录 System.out.println("loadpath="+loadpath); DiskFileUpload fu =new DiskFileUpload(); fu.setSizeMax(1*1024*1024); // 设置允许用户上传文件大小,单位:字节 fu.setSizeThreshold(4096); // 设置最多只允许在内存中存储的数据,单位:字节 fu.setRepositoryPath(temp); // 设置一旦文件大小超过getSizeThreshold()的值时数据存放在硬盘的目录 //开始读取上传信息 int index=0; List fileItems =null; try { fileItems = fu.parseRequest(request); System.out.println("fileItems="+fileItems); } catch (Exception e) { e.printStackTrace(); } Iterator iter = fileItems.iterator(); // 依次处理每个上传的文件 while (iter.hasNext()) { FileItem item = (FileItem)iter.next();// 忽略其他不是文件域的所有表单信息 if (!item.isFormField()) { String name = item.getName();//获取上传文件名,包括路径 name=name.substring(name.lastIndexOf("\\")+1);//从全路径中提取文件名 long size = item.getSize(); if((name==null||name.equals("")) && size==0) continue; int point = name.indexOf("."); name=(new Date()).getTime()+name.substring(point,name.length())+index; index++; File fNew=new File(loadpath, name); try { item.write(fNew); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } else//取出不是文件域的所有表单信息 { String fieldvalue = item.getString(); //如果包含中文应写为：(转为UTF-8编码) //String fieldvalue = new String(item.getString().getBytes(),"UTF-8"); } } String text1="11"; response.sendRedirect("result.jsp?text1="+ text1); } android客户端代码
publicclass PhotoUpload extends Activity { private String newName ="image.jpg"; private String uploadFile ="/sdcard/image.JPG"; private String actionUrl ="http://192.168.0.71:8086/HelloWord/myForm"; private TextView mText1; private TextView mText2; private Button mButton; @Override publicvoid onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.photo_upload); mText1 = (TextView) findViewById(R.id.myText2); //"文件路径：\n"+ mText1.setText(uploadFile); mText2 = (TextView) findViewById(R.id.myText3); //"上传网址：\n"+ mText2.setText(actionUrl); /* 设置mButton的onClick事件处理 */ mButton = (Button) findViewById(R.id.myButton); mButton.setOnClickListener(new View.OnClickListener() { publicvoid onClick(View v) { uploadFile(); } }); } /* 上传文件至Server的方法 */ privatevoid uploadFile() { String end ="\r\n"; String twoHyphens ="--"; 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); /* 设置传送的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); /* 设置DataOutputStream */ DataOutputStream ds = new DataOutputStream(con.getOutputStream()); ds.writeBytes(twoHyphens + 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); /* 设置每次写入1024bytes */ int bufferSize =1024; byte[] buffer =newbyte[bufferSize]; int length =-1; /* 从文件读取数据至缓冲区 */ while((length = fStream.read(buffer)) !=-1) { /* 将资料写入DataOutputStream中 */ ds.write(buffer, 0, length); } ds.writeBytes(end); ds.writeBytes(twoHyphens + boundary + twoHyphens + end); /* close streams */ 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 ); } /* 将Response显示于Dialog */ showDialog("