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jsp,servlet简单的文件上传

作者:yjjie | 日期2009-05-18 23:14:47

jsp,servlet利用Commons-upload进行文件上传（自己解析协议太麻烦了）

Commons-upload是apache的开源项目

注意：Commons-upload要结合Commons-io来使用这两个包都可以在apache网站上下到

Commons FileUpload提供三种文件上传处理方式，DiskFileUpload、ServletFileUpload和PortletFileUpload三种方式

DiskFileUpload已经被标记为过期！而PortletFileUpload需要配合portlet-api来使用，所以这里我用最简单的ServletFileUpload来写个很简单的例子！

html就一个带有file的表单！自己写！

servlet:

package com.tarena.web.servlet;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
public class FileUpload extends HttpServlet {
/**
*
*/
private static final long serialVersionUID = -1374320117413755987L;
/**
* Constructor of the object.
*/
public FileUpload() {
super();
}
/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println("  <BODY>");
out.println("本页面不支持get方式提交");
out.println("  </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");
PrintWriter out = response.getWriter();
//html
out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println("  <BODY>");
//取得上传目录
String up_file = this.getServletContext().getRealPath("/upload");
out.println("文件目录:"+up_file+"<br/>");
// 用于设定诸如缓存之类的参数，和性能相关
// 此处用默认设定
DiskFileItemFactory dfif = new DiskFileItemFactory();
//用于解析表单中的数据
ServletFileUpload upload = new ServletFileUpload(dfif);
upload.setSizeMax(100*1024*1024);//允许上传的最大 size
try {
//取得文件列表
List fileItems = upload.parseRequest(request);
Iterator it = fileItems.iterator();
while(it.hasNext()){
FileItem item = (FileItem)it.next();
if(!item.isFormField()){
String name = item.getName();
out.println("文件名:"+name+"<br/>");
out.println("字段名:"+item.getFieldName()+"<br/>");
item.write(new File(up_file+"\\"+
name.replace(".", "_"+new Date().getTime()+".")));
}
}
} catch (FileUploadException ex) {
// TODO Auto-generated catch block
ex.printStackTrace();
out.println("上传失败："+ex.getMessage());
} catch(Exception ex){
ex.printStackTrace();
out.println("上传失败："+ex.getMessage());
}
out.println("  </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
}

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jsp,servlet简单的文件上传

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