Java上传文件common-fileupload

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jsp文件上传大多采用开源项目Commons FileUpload来简化处理，可以在http://jakarta.apache.org/commons/fileupload/下载，这个包需要Commons IO的支持，可以在http://jakarta.apache.org/commons/io/下载。Commons FileUpload提供三种文件上传处理方式，DiskFileUpload、ServletFileUpload和 PortletFileUpload三种方式，其中DiskFileUpload已经在javadoc下已经被标记为过期的方法，建议用 ServletFileUpload代替，而PortletFileUpload需要配合portlet-api来使用，所以这里我们只介绍 ServletFileUpload，并且这个也是最常用的。使用如下：

test.jsp：

<%@ page language="java" import="java.util.*" contentType="text/html;charset=gbk" pageEncoding="gbk"%><html>   <body>     <form action="/MultipartTestServlet" enctype="multipart/form-data" method="post">      <input type="text" name="username" /><br />      <input type="file" name="myfile" /><br/>      <input type="file" name="myfile" /><br/>      <input type="submit" />     </form>   </body></html>

MultipartTestServlet.java：

import java.io.File;import java.io.IOException;import java.util.ArrayList;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.FileUpload;import org.apache.commons.fileupload.FileUploadException;import org.apache.commons.fileupload.RequestContext;import org.apache.commons.fileupload.disk.DiskFileItemFactory;import org.apache.commons.fileupload.servlet.ServletFileUpload;import org.apache.commons.fileupload.servlet.ServletRequestContext;public class MultipartTestServlet extends HttpServlet {  public MultipartTestServlet() {      super();  }  public void doPost(HttpServletRequest request, HttpServletResponse response)      throws ServletException, IOException {      request.setCharacterEncoding("utf-8");      RequestContext requestContext = new ServletRequestContext(request);         if(FileUpload.isMultipartContent(requestContext)){                DiskFileItemFactory factory = new DiskFileItemFactory();            factory.setRepository(new File("c:/tmp/"));            ServletFileUpload upload = new ServletFileUpload(factory);            //upload.setHeaderEncoding("utf-8");            upload.setSizeMax(2000000);            List items = new ArrayList();            try {               items = upload.parseRequest(request);            } catch (FileUploadException e1) {               System.out.println("文件上传发生错误" + e1.getMessage());            }            Iterator it = items.iterator();            while(it.hasNext()){                FileItem fileItem = (FileItem) it.next();                if(fileItem.isFormField()){                             System.out.println(fileItem.getFieldName() + "   " + fileItem.getName() + "   " + new String                                           (fileItem.getString().getBytes("iso8859-1"), "gbk"));                }else{                       System.out.println(fileItem.getFieldName() + "   " +                                fileItem.getName() + "   " + fileItem.isInMemory() + "    " +                                fileItem.getContentType() + "   " + fileItem.getSize());                             if(fileItem.getName()!=null && fileItem.getSize()!=0){                               File fullFile = new File(fileItem.getName());                               File newFile = new File("c:/temp/" + fullFile.getName());                               try {                                   fileItem.write(newFile);                               } catch (Exception e) {                                      e.printStackTrace();                               }                       }else{                               System.out.println("文件没有选择 或 文件内容为空");                       }                }                  }       }   }}

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