uploadservlet.java

java实现的透明信息上传组件

package test;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Enumeration;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileItemStream;
import org.apache.commons.fileupload.util.Streams;

public class UploadServlet extends HttpServlet {

	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {

		resp.setContentType("text/html;charset=gb2312");
		PrintWriter out=resp.getWriter();
		
		out.println("用户:"+req.getParameter("author"));
		out.println("来自:"+req.getParameter("company"));
		
		//设置上传文件后的保存目录
	    String path=this.getServletContext().getRealPath("/upload");
		File saveDir = new File(path);  
		
		MultipartRequest mreq=(MultipartRequest)req;
		Enumeration fileItemNames=mreq.getFileItemNames();
		
		while(fileItemNames.hasMoreElements()){
			
			String name=(String)fileItemNames.nextElement();
		
			FileItemStream fis=(FileItemStream) mreq.getFileItem(name);
			System.out.println("---------------");
			InputStream stream2=fis.openStream();
			System.out.println("---------------");
			String fileName = fis.getName().substring(fis.getName().lastIndexOf("\\")+1);
			BufferedInputStream in = new BufferedInputStream(stream2);   //获得文件输入流
			BufferedOutputStream out2 = new BufferedOutputStream(new FileOutputStream(new File(saveDir,fileName)));  //获得文件输出流
			Streams.copy(in, out2, true);   //开始把文件写到你指定的上传文件夹
		}
		
		}
	}