Java客户端通过Http发送POST请求上传文件到web服务器

http://www.cnblogs.com/WilliamJiang/archive/2012/04/29/2475883.html

1.朋友的一个需求，让我给他实现，需求是这样的，需要用ASP.net写一个页面负责处理客户端上传的文件，并根据传递的参数把文件保存到相应的目录。客户端是手机应用程序，因为没学过Android，所以我只是写了一个Java的Demo用来上传文件。

服务端：

public partial class _Default : System.Web.UI.Page
{

    private string id = "";
    private string userName = "";
    private string type = "";
    private string fileName = "";
    //文件长度
    private long contentLength = 0;
    private static readonly string filePath = ConfigurationManager.AppSettings["filePath"];
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            id = Request["id"];
            userName = Request["user"];
            type = Request["type"];
            fileName = Request.Headers["FileName"];
            writeFile();
        }
    }

    /// <summary>
    /// 上传文件
    /// </summary>
    private void writeFile()
    {
        try
        {
            Stream stream = Request.InputStream;
            contentLength = stream.Length;
            string currentFilePath = filePath + userName;
            if (!Directory.Exists(currentFilePath))
            {
                Directory.CreateDirectory(currentFilePath);
            }

            FileStream fileStream = File.Create(currentFilePath + @"\" + fileName);
            //每次读取的1024个字节
            byte[] bytes = new byte[1024];

            int numReadByte = 0;
            while ((numReadByte = stream.Read(bytes, 0, 1024)) != 0)
            {
                fileStream.Write(bytes, 0,numReadByte);
            }
            //关闭流
            stream.Close();
            fileStream.Close();

    }

Java文件上传客户端示例,（几年没搞java有点生疏了）:

import java.io.BufferedOutputStream;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.net.HttpURLConnection;
import java.net.URL;

/**
 *
 * 只是写的一个示例，filePath,和FileName根据需要进行调整。
 */
public class MyTest {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub

        String str="http://localhost:2906/Default.aspx?id=1&user=2&type=3";
        String filePath="D:\\Wildlife.wmv";
        String fileName="Wildlife.wmv";
        try {
            URL url=new URL(str);
            HttpURLConnection connection=(HttpURLConnection)url.openConnection();
            connection.setDoInput(true);
            connection.setDoOutput(true);
            connection.setRequestMethod("POST");
            connection.addRequestProperty("FileName", fileName);
            connection.setRequestProperty("content-type", "text/html");
            BufferedOutputStream  out=new BufferedOutputStream(connection.getOutputStream());

            //读取文件上传到服务器
            File file=new File(filePath);
            FileInputStream fileInputStream=new FileInputStream(file);
            byte[]bytes=new byte[1024];
　　　　　　　int numReadByte=0;
            while((numReadByte=fileInputStream.read(bytes,0,1024))>0)
            {
                out.write(bytes, 0, numReadByte);
            }
            out.flush();
            fileInputStream.close();
            //读取URLConnection的响应
            DataInputStream in=new DataInputStream(connection.getInputStream());
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

}