servlet文件上传

1.获取文件上传路径

String path=request.getServletContext.getRePath("/WEB-INF/resources");

2.获得工厂

3.通过servletFileUpLoad 解析返回一个List<FileItem>集合

4.进行遍历根据isFiled 判断是普通文本，然后进行遍历，

5.获得文件输入流，和输入流

6.文件上传成功

代码

 package jquery;

 import java.io.File;

 import java.io.FileOutputStream;

 import java.io.IOException;

 import java.io.InputStream;

 import java.io.OutputStream;

 import java.util.List;

 import javax.servlet.ServletException;

 import javax.servlet.annotation.WebServlet;

 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;

 @WebServlet("/upload")

 public class UploadServlet extends HttpServlet{

     @Override

     public void service(HttpServletRequest request,  HttpServletResponse response) throws ServletException, IOException {

         //获得上传路径

         String savePath=this.getServletContext().getRealPath("/resources");

         File file=new File(savePath);

         if(!file.isDirectory()&&!file.exists()){

             file.mkdir();

         }

         //文件上传

         //创建工厂

         DiskFileItemFactory factory=new DiskFileItemFactory();

         //创建解析器

         ServletFileUpload upload=new ServletFileUpload(factory);

         //解决上传文件乱码问题

         upload.setHeaderEncoding("UTF-8");

         //判断提交过来的是不是表单数据

         if(!upload.isMultipartContent(request)){

             return;

         }

         //使用servletFileUpLoad 将解析结果返回List<FileItem> 结合中FileItem对应表单输入项

         try {

             List<FileItem> item=upload.parseRequest(request);

             for (FileItem fileItem : item) {

                 String message="";

                 //如果不是file类型

                 if(fileItem.isFormField()){

                     System.out.println(fileItem.getString());

                 }else{

                     //是上传文件

                     //得到上传文件名

                     String filename=fileItem.getName();

                     System.out.println(filename);

                     if(filename==null||fileItem.equals("")){

                         continue;

                     }

                      System.out.println(filename);

                     //获得item 文件输入流

                         InputStream in=fileItem.getInputStream();

                         //创建文件输出流

                         OutputStream out=new FileOutputStream(savePath+"\\"+filename);

                         System.out.println(savePath+"\\"+filename);

                         //创建缓冲区

                         byte[] buffer=new byte[1024];

                         int len=0;

                         while((len=in.read(buffer))!=-1){

                             out.write(buffer, 0, len);

                         }

                             in.close();

                             out.close();

                             fileItem.delete();

                             System.out.println("上传成功");

                 }

             }

         } catch (FileUploadException e) {

             e.printStackTrace();

         }

     }

 }

uploadServlet

 <%@ page language="java" contentType="text/html; charset=utf-8"

     pageEncoding="utf-8"%>

 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

 <html>

 <head>

 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">

 <title>Insert title here</title>

 <script type="text/javascript"

     src="${pageContext.request.contextPath }/js/jquery-1.9.1.min.js"></script>

 </head>

 <body>

     <form action="${pageContext.request.contextPath }/upload" method="post"

         enctype="multipart/form-data" method="post">

         上传用户名：<input type="text" name="username" /><br /> <input id="file1"

             type="file" name="file1" /><img src="c/fakepath/1.jpg"> <input

             type="file" name="file2" /> <input type="submit" value="上传" />

     </form>

 </body>

 <script type="text/javascript">

 </script>

 </html>

html

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servlet文件上传

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