急！急！在线候救！！怎么实现form上传

Question

是上传一个文件？
还是在form中填写的内容？
如果要将在页面上填写的form内容进行放到servlet处理到是很简单的。

Answer 1

URLConnection中实现form
要不直接在连接的后面带参数直接指向绝对路径！
再由一个客户端程序进行处理形成流文件交给服务器端处理

Answer 2

URLConnection.getOutStream()按照Http格式把你的文件内容写进去，就没问题了

Answer 3

模拟上传的代码，请自行优化：import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.Socket;
public class SimulateUpload
{
    private static final byte[] BOUNDARY = "---------------------------7d33bc1b47038c".getBytes();
    private static final byte[] CRLF = "\r\n".getBytes();    public void simUpload(String page, String[] paramNames, Object[] paramValues, OutputStream os) throws IOException
    {
        int contentLength = calculateLength(paramNames, paramValues);        os.write(("POST " + page + " HTTP/1.1\r\n").getBytes());
        os.write("User-Agent: myselfHttp/1.0\r\n".getBytes());
        os.write("Accept: */*\r\n".getBytes());
        os.write("Host: localhost\r\n".getBytes());
        os.write("Content-Type: multipart/form-data; boundary=".getBytes());
        os.write(BOUNDARY);
        os.write(CRLF);
        os.write(("Content-Length: " + contentLength).getBytes());
        os.write(CRLF);
        os.write(CRLF);        os.write(BOUNDARY);
        os.write(CRLF);
        for(int i=0; i<paramNames.length; i++)
        {
            if(paramValues[i] instanceof String)
                writeParameter(os, paramNames[i], (String) paramValues[i]);
            else if(paramValues[i] instanceof File)
                writeFile(os, paramNames[i], (File) paramValues[i]);
        }
        os.flush();
    }    private void writeFile(OutputStream os, String paramName, File file) throws IOException
    {
        os.write("Content-Disposition: form-data; name=\"".getBytes());
        os.write(paramName.getBytes());
        os.write("\"; filename=\"".getBytes());
        os.write(file.getAbsolutePath().getBytes());
        os.write("\"\r\nContent-Type: application/octet-stream".getBytes());
        os.write(CRLF);
        os.write(CRLF);        FileInputStream fis = new FileInputStream(file);
        byte[] buf = new byte[4096];
        int bytes = 0;
        while((bytes = fis.read(buf)) != -1)
            os.write(buf, 0, bytes);
        fis.close();        os.write(CRLF);
        os.write(BOUNDARY);
        os.write(CRLF);
    }    private void writeParameter(OutputStream os, String name, String value) throws IOException
    {
        os.write("Content-Disposition: form-data; name=\"".getBytes());
        os.write(name.getBytes());
        os.write('"');
        os.write(CRLF);
        os.write(CRLF);
        os.write(value.getBytes());
        os.write(CRLF);
        os.write(BOUNDARY);
        os.write(CRLF);
    }    private int calculateLength(String[] paramNames, Object[] paramValues)
    {
        int result = BOUNDARY.length + CRLF.length;
        for(int i=0; i<paramNames.length; i++)
        {
            if(paramValues[i] instanceof String)
                result += 88 + paramNames[i].getBytes().length + ((String)paramValues[i]).getBytes().length;
            else if(paramValues[i] instanceof File)
            {
                File file = (File) paramValues[i];
                result += 141 + paramNames[i].getBytes().length + file.getAbsolutePath().getBytes().length + file.length();
            }
        }
        return result;
    }    public static void main(String[] args)
    {
        try
        {
            Socket socket = new Socket("localhost", 80);
            OutputStream os = socket.getOutputStream();
            //OutputStream os = new FileOutputStream("request");
            SimulateUpload sim = new SimulateUpload();
            String[] paramNames = new String[]{"param1", "param2", "param3", "file", "file2"};
            Object[] paramValues = new Object[]{"value1", "value2", "value3", new File("d:\\test.txt"), new File("d:\\test1.txt")};
            sim.simUpload("/uploadServlet", paramNames, paramValues, os);
            os.flush();
            os.close();
            socket.close();
        }
        catch(Exception e)
        {
            e.printStackTrace();
        }
    }
}