Servlet文件上传

Servlet文件上传要点：

1、设置注解：@MultipartConfig

2、表单提交方式：post

3、设置表单提交编码格式：enctype="multipart/form-data"

4、代码如下：

package com.tiger.fileload;

import java.io.*;
import javax.servlet.ServletException;
import javax.servlet.annotation.*;
import javax.servlet.http.*;
/**
 * 单文件上传
 * 1、设置注解：@MultipartConfig
 * 2、表单提交方式：post
 * 3、设置表单提交编码格式：enctype="multipart/form-data"
 * @author tiger
 * @time 2017年9月1日
 */
@WebServlet("/fileloadone")
@MultipartConfig
public class FileupOne extends HttpServlet {
    private static final long serialVersionUID = 1L;
    
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //获取文件对象：filename前端表单提交获取。
        Part part = request.getPart("filename");
        //获取上传文件名
        String fileName = getFileName(part);
        //获取上传文件夹
        String uploadFolder = getUploadFolder(request, "tigerUploadOne");
        
//      part.write(uploadFolder+fileName);
        
        //获取文件输入流
        InputStream is = part.getInputStream();
        //获取文件输出流
        OutputStream os = new FileOutputStream( new File(uploadFolder+fileName));
        System.out.println("one："+uploadFolder+fileName);
        //上传文件
        uploadFile(is, os);
        //关闭传输流
        os.flush();
        os.close();
    }
    /**
     * 上传文件方法
     * @param is
     * @param os
     */
    private void uploadFile(InputStream is,OutputStream os) {
        //缓存大小，一次读取1024个字节
        byte[] buff = new byte[1024];
        int len = 0;
        try {
            while ((len = is.read(buff)) != -1) {
                os.write(buff, 0, len);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    /**
     * 获取上传文件名
     * @param part
     * @return
     */
    private String getFileName(Part part) {
        String header=part.getHeader("Content-Disposition");
        String fileName=header.substring(header.indexOf("filename=\"")+10, header.lastIndexOf("\""));
        return fileName;
    }
    /**
     * 获取文件上传路径
     * @param request HttpServletRequest请求对象
     * @param upload 文件上传的文件夹
     * @return
     */
    private String getUploadFolder(HttpServletRequest request,String upload) {
        //获取上传文件的路径名：upload为自己设置
        String uploadFolder = request.getServletContext().getRealPath(File.separator+upload) + File.separator;
        //以上一步获取的文件路径名创建上传文件夹
        File file = new File(uploadFolder);
        //如果文件夹不存在，则创建
        if (!file.exists()) {
            file.mkdirs();
        }
        return uploadFolder;
    }
}
package com.tiger.fileload;

import java.io.*;
import java.util.Collection;
import javax.servlet.ServletException;
import javax.servlet.annotation.*;
import javax.servlet.http.*;
/**
 * 多文件上传
 * 1、设置注解：@MultipartConfig
 * 2、表单提交方式：post
 * 3、设置表单提交编码格式：enctype="multipart/form-data"
 * @author tiger
 * @time 2017年9月1日
 */
@WebServlet("/fileloadmore")
@MultipartConfig
public class FileupMore extends HttpServlet {
    private static final long serialVersionUID = 1L;

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //获取文件对象List：filename前端表单提交获取。
        Collection
   
     partList = request.getParts();
        for (Part part : partList) {
            if(part.getName().equals("filename")) {
                //获取上传文件名
                String fileName = getFileName(part);
                //获取上传文件夹
                String uploadFolder = getUploadFolder(request, "tigerUploadMore");
                //将文件写入服务器
                part.write(uploadFolder+fileName);
                System.out.println("more："+uploadFolder+fileName);
            }
        }
    }
    /**
     * 获取上传文件名
     * @param part
     * @return
     */
    private String getFileName(Part part) {
        String header=part.getHeader("Content-Disposition");
        String fileName=header.substring(header.indexOf("filename=\"")+10, header.lastIndexOf("\""));
        return fileName;
    }
    /**
     * 获取文件上传路径
     * @param request HttpServletRequest请求对象
     * @param upload 文件上传的文件夹
     * @return
     */
    private String getUploadFolder(HttpServletRequest request,String upload) {
        //获取上传文件的路径名：upload为自己设置
        String uploadFolder = request.getServletContext().getRealPath(File.separator+upload) + File.separator;
        //以上一步获取的文件路径名创建上传文件夹
        File file = new File(uploadFolder);
        //如果文件夹不存在，则创建
        if (!file.exists()) {
            file.mkdirs();
        }
        return uploadFolder;
    }
}




    
---fileload-one---


    文件上传2：
  
     

    文件上传3：
  
     






    
---fileload-more---


    文件上传2：
  
     

    文件上传3：