Android 实现文件(图片)上传

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

public class 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("上传成功"+b.toString().trim());          /* 关闭DataOutputStream */          ds.close();        }        catch(Exception e)        {          showDialog("上传失败"+e);        }      }      /* 显示Dialog的method */      privatevoid showDialog(String mess)      {        new AlertDialog.Builder(PhotoUpload.this).setTitle("Message")         .setMessage(mess)         .setNegativeButton("确定",new DialogInterface.OnClickListener()         {           publicvoid onClick(DialogInterface dialog, int which)           {                     }         })         .show();      }    }

原文出自:http://www.cnblogs.com/gzggyy/archive/2011/08/02/2125237.html

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