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jsp+servlet簡(jiǎn)單實(shí)現(xiàn)上傳文件功能（保存目錄改進(jìn)）

1、jsp前端

<%--
 created by intellij idea.
 user: lenovo
 date: 2020/6/19
 time: 22:53
 learn from https://www.bilibili.com/video/bv18z411i7gh?t=23&p=192
 to change this template use file | settings | file templates.
--%>
<%@ page contenttype="text/html;charset=utf-8" language="java" %>
<html>
<head>
  <title>文件上傳</title>
</head>
<body>
  <!--文件上傳對(duì)表單的要求-->
  <!--
    1、表單中的請(qǐng)求提交方式必須是post
    2、表單中應(yīng)指定所提交的請(qǐng)求位multipart請(qǐng)求，通過(guò)在<form/>標(biāo)簽中添加enctype屬性
      其值為multipart/form-data
    3、 表單
  -->
  <form method="post" action="http://localhost:8888/hello/uploadimageservlet" enctype="multipart/form-data">
    編號(hào)<input type="text" name="bno"></br>
    名字<input type="text" name="bname"></br>
    照片<input type="file" name="picutreurl"></br>
    <input type="submit" value="注冊(cè)">
  </form>
</body>
</html>

2、servlet后臺(tái)

package servlet.bookservlet;

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;
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 java.io.*;
import java.text.simpledateformat;
import java.util.calendar;
import java.util.date;
import java.util.list;


@webservlet(name = "uploadimageservlet")
public class uploadimageservlet extends httpservlet {
  @override
  protected void doget(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception {
    this.dopost(request,response);
  }
  @override
  protected void dopost(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception {
    //1、判斷請(qǐng)求是不是multipart請(qǐng)求
    if(!servletfileupload.ismultipartcontent(request)){
      throw new runtimeexception("當(dāng)前請(qǐng)求不支持文件上傳");
    }
    system.out.println("開(kāi)始上傳文件");
    //2、創(chuàng)建fileitem工廠==>文件寫(xiě)入硬盤的作用
    try {
      diskfileitemfactory factory = new diskfileitemfactory();
      //3、創(chuàng)建temp臨時(shí)文件夾
      string temppath ="d:\\tomcat\\apache-tomcat-9.0.35-windows-x64\\apache-tomcat-9.0.35\\webapps\\librarysystem\\web\\net\\temp";
      file tempfile = new file(temppath);
      factory.setrepository(tempfile);
      //4、設(shè)置使用臨時(shí)文件的邊界值,大于該值，上傳文件先保存在臨時(shí)文件中，小于該值，則直接寫(xiě)入內(nèi)存
      //單位是字節(jié)
      factory.setsizethreshold(1024*1024*1);

      //5、創(chuàng)建文件上傳核心組件
      // 調(diào)用servletfileupload.parserequest方法解析request對(duì)象，得到一個(gè)保存了所有上傳內(nèi)容的list對(duì)象。
      servletfileupload upload = new servletfileupload(factory);
      upload.setheaderencoding("utf-8");//可以解決文件名中文亂碼
      upload.setfilesizemax(1024*1024*2);

      string bno="defaultbno",bname="defaultbname";
      //6、解析請(qǐng)求
      list<fileitem> items =upload.parserequest(request);
      //7、遍歷請(qǐng)求
      for(fileitem item:items){
        //普通表單項(xiàng)，上傳名字，編號(hào)等普通信息的上i傳
        if(item.isformfield()){
          string filename = item.getfieldname();// name屬性值
          string filevalue = item.getstring("utf-8");// name對(duì)應(yīng)的value值
          system.out.println(filename + " -- " + filevalue);
          if(filename.equalsignorecase("bno")){
            bno = filevalue;
          }
          if(filename.equalsignorecase("bname")){
            bname = filevalue;
          }
         }
        else{//上傳圖片等
          string filename = item.getname();
          system.out.println("上傳文件名字:"+filename);
          string suffix = filename.substring(filename.lastindexof('.'));//獲取文件類型
          string newfilename = bno+"_"+bname+suffix;
          system.out.println(newfilename);
          //獲取輸入流，其中有上傳文件的內(nèi)容
          inputstream is = item.getinputstream();
          //string path = this.getservletcontext().getrealpath("/net/bookimage");//獲得當(dāng)前項(xiàng)目保存服務(wù)器地址，也就是web文件夾下
          string path ="d:\\tomcat\\apache-tomcat-9.0.35-windows-x64\\apache-tomcat-9.0.35\\webapps\\librarysystem\\web\\net\\bookimage";
          //文件夾內(nèi)文件數(shù)目有上限，但是可以創(chuàng)建子目錄
            //獲取當(dāng)前系統(tǒng)時(shí)間
            calendar now = calendar.getinstance();
            int year = now.get(calendar.year);
            int month = now.get(calendar.month)+1;
            int day = now.get(calendar.day_of_month);
            path = path+"/"+year+"/"+month+"/"+day;
            //若該目錄不存在，直接創(chuàng)建新目錄
            file dirfile = new file(path);
            if(!dirfile.exists()){
              dirfile.mkdirs();
            }
          //創(chuàng)建目標(biāo)文件，用來(lái)保存上傳文件
          file desfile = new file(path,newfilename);
          //創(chuàng)建文件輸出流
          outputstream os = new fileoutputstream(desfile);
          //將輸入流數(shù)據(jù)寫(xiě)入到輸出流中
          int len=-1;
          byte[]buf = new byte[1024];
          while((len=is.read(buf))!=-1){
            os.write(buf,0,len);
          }
          //desfile.delete();//刪除臨時(shí)文件
          os.close();//輸出流
          is.close();//輸入流
          //刪除臨時(shí)文件
          item.delete();
        }
      }
    } catch (fileuploadexception e) {
      e.printstacktrace();
    }
  }
}

總結(jié)

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