commons.fileupload简单应用

导入包:

commons-fileupload-1.3.1.jar

commons-io-2.4.jar

commons-fileupload依赖于commons-io,commons-io-2.4必须是JDK6+;

下载地址:

http://commons.apache.org/proper/commons-fileupload/download_fileupload.cgi

http://commons.apache.org/proper/commons-io/download_io.cgi

index.jsp

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
    </head>
    <body>
        <h1>Hello World!</h1>

        <form name="myform" action="FileUploadTestServlet" method="post" enctype="multipart/form-data">
            姓名: <br>
            <input type="text" name="name" size="15"><br>
            附件1:<br>
            <input type="file" name="myfile1"><br>
            附件2:<br>
            <input type="file" name="myfile2"><br>
            <br>
            <input type="submit" name="submit" value="Commit">
        </form>
    </body>
</html>

FileUploadTestServlet.java

import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Iterator;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
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.FileItemFactory;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

/**
 *
 * @author y
 */
public class FileUploadTestServlet extends HttpServlet {

    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        
        if(!ServletFileUpload.isMultipartContent(request)){
            return;
        }
        
        FileItemFactory fileFactory = new DiskFileItemFactory();
        
        ServletFileUpload fileUpload = new ServletFileUpload(fileFactory);
        
        try {
            List items = fileUpload.parseRequest(request);
            Iterator iter = items.iterator();
            
            while(iter.hasNext()){
                FileItem item = (FileItem)iter.next();
                if(item.isFormField()){
                    out.print("<p>"+item.getFieldName()+":"+new String(item.getString().getBytes("ISO8859-1"), "utf-8")+"</p>");
                }else{
                    String path = "/home/y/my_temp/upload"+File.separator+item.getName();
                    File disk = new File(path);
                    item.write(disk);
                    
                    out.print("<p>文件保存到:"+path+"</p>");
                }
            }
        } catch (FileUploadException ex) {
            Logger.getLogger(FileUploadTestServlet.class.getName()).log(Level.SEVERE, null, ex);
        } catch (Exception ex) {
            Logger.getLogger(FileUploadTestServlet.class.getName()).log(Level.SEVERE, null, ex);
        }finally{
            out.close();
        }
        
    }

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

}

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原文地址：https://www.cnblogs.com/yshyee/p/4141099.html