·Servlet 文件上传 FileUpload

·实现以下代码前需要在项目中添加jar包commons-fileupload-1.2.1.jar 和其支持jar包commons-io-1.4.jar（即使用commons-fileupload-1.2.1.jar的前提是加载commons-io-1.4.jar）

package com.yinhe.upload;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
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("/upLoadServlet")
public class upLoadServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

   public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
       // TODO Auto-generated method stub
       //获取上传文件保存路径
       String basePath = this.getServletContext().getRealPath("/WEB-INF/upload");
       System.out.println(basePath);
       String message="";
       //创建一个DiskFileItemFactory
       DiskFileItemFactory factory = new DiskFileItemFactory();
       //创建一个文件上传解析器
       ServletFileUpload fileUpload = new ServletFileUpload(factory);

       //处理中文乱码
       fileUpload.setHeaderEncoding("utf-8");
       //判断提交数据是否是上传表单的数据
       if(!ServletFileUpload.isMultipartContent(request)){
           return;
       }
       try {
           List<FileItem> list = fileUpload.parseRequest(request);
           for(FileItem item:list){
               //判断表单是普通表单还是上传表单
               if(item.isFormField()){
                   //普通数据
                   String name=item.getFieldName();
                   System.out.println(name);
               }else{
                   //上传文件
                   String fileName=item.getName();
                   if(fileName==null || fileName.trim().equals("")){
                       continue;
                   }
                   //获取文件名
                   fileName=fileName.substring(fileName.lastIndexOf("\\")+1);
                   //创建一个文件输入流
                   InputStream in =item.getInputStream();
                   //创建一个文件输出流
                   FileOutputStream out = new FileOutputStream(basePath+"/"+fileName);
                   //创建一个缓冲区
                   byte[] buffer=new byte[1024];
                   int len=0;
                   //循环将输入流读入缓冲区当中
                   while((len=in.read(buffer))>0){
                       //使用输出流将缓冲区的数据写入到指定目录
                       out.write(buffer, 0, len);
                   }
                   //关闭流
                   in.close();
                   out.close();
                   //删除临时文件
                   item.delete();
                   message="文件上传成功";
               }
           }
       } catch (FileUploadException e) {
           // TODO Auto-generated catch block
           message="文件上传失败";
           e.printStackTrace();
       }
       request.setAttribute("message", message);
       request.getRequestDispatcher("/message.jsp").forward(request, response);
   }

}

·Servlet 文件上传 FileUpload

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