android上传图片至服务器

服务器servlet代码

public void 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
public void 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()
{
public void onClick(View v)
{
uploadFile();
}
});
}

/* 上传文件至Server的方法 */
private void 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 = new byte[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 */
private void showDialog(String mess)
{
new AlertDialog.Builder(PhotoUpload.this).setTitle("Message")
.setMessage(mess)
.setNegativeButton("确定",new DialogInterface.OnClickListener()
{
public void onClick(DialogInterface dialog, int which)
{
}
})
.show();
}
}