ajax으로 file upload를 해보자 & 첨부파일 이미지 미리보기

Wooni0477 2020. 3. 9. 14:35

1. form을 사용하지않고 따로 ajax으로 upload를 해보자

2. 첨부파일 이미지 미리보기

form.jsp

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<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<script src="https://code.jquery.com/jquery-3.4.1.min.js"></script>
</head>
<body>
 
<div>
    <label for="file1">파일</label> 
    <input type="file" id="file1" name="file1"> 
    <button id="btn_submit" onclick="javascript:fn_submit()">전송</button>    
</div>
 
<div>
       <div class="img_wrap">
           <img id="img" />
       </div>
</div>
 
<script type="text/javascript">
    //이미지 미리보기
    var sel_file;
 
    $(document).ready(function() {
        $("#file1").on("change", handleImgFileSelect);
    });
 
    function handleImgFileSelect(e) {
        var files = e.target.files;
        var filesArr = Array.prototype.slice.call(files);
 
        var reg = /(.*?)\/(jpg|jpeg|png|bmp)$/;
 
        filesArr.forEach(function(f) {
            if (!f.type.match(reg)) {
                alert("확장자는 이미지 확장자만 가능합니다.");
                return;
            }
 
            sel_file = f;
 
            var reader = new FileReader();
            reader.onload = function(e) {
                $("#img").attr("src", e.target.result);
            }
            reader.readAsDataURL(f);
        });
    }
</script>
    
<script>
//파일 업로드
function fn_submit(){
        
        var form = new FormData();
        form.append( "file1", $("#file1")[0].files[0] );
        
         jQuery.ajax({
             url : "/myapp/result"
           , type : "POST"
           , processData : false
           , contentType : false
           , data : form
           , success:function(response) {
               alert("성공하였습니다.");
               console.log(response);
           }
           ,error: function (jqXHR) 
           { 
               alert(jqXHR.responseText); 
           }
       });
}
</script>
</body>
</html>
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cs

controller

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package com.bitcamp.myapp;
 
import java.io.File;
import java.util.Calendar;
 
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;
 
@Controller
public class UploadForm {
    
    private String path="C:\\myfolder\\01_project";
    
    @RequestMapping("/form")
    public String form()
    {
        return "form";
    }
    
    @RequestMapping("/result")
    public String result(@RequestParam("file1") MultipartFile multi,HttpServletRequest request,HttpServletResponse response, Model model)
    {
        String url = null;
        
        try {
 
            //String uploadpath = request.getServletContext().getRealPath(path);
            String uploadpath = path;
            String originFilename = multi.getOriginalFilename();
            String extName = originFilename.substring(originFilename.lastIndexOf("."),originFilename.length());
            long size = multi.getSize();
            String saveFileName = genSaveFileName(extName);
            
            System.out.println("uploadpath : " + uploadpath);
            
            System.out.println("originFilename : " + originFilename);
            System.out.println("extensionName : " + extName);
            System.out.println("size : " + size);
            System.out.println("saveFileName : " + saveFileName);
            
            if(!multi.isEmpty())
            {
                File file = new File(uploadpath, multi.getOriginalFilename());
                multi.transferTo(file);
                
                model.addAttribute("filename", multi.getOriginalFilename());
                model.addAttribute("uploadPath", file.getAbsolutePath());
                
                return "filelist";
            }
        }catch(Exception e)
        {
            System.out.println(e);
        }
        return "redirect:form";
    }
    
    // 현재 시간을 기준으로 파일 이름 생성
    private String genSaveFileName(String extName) {
        String fileName = "";
        
        Calendar calendar = Calendar.getInstance();
        fileName += calendar.get(Calendar.YEAR);
        fileName += calendar.get(Calendar.MONTH);
        fileName += calendar.get(Calendar.DATE);
        fileName += calendar.get(Calendar.HOUR);
        fileName += calendar.get(Calendar.MINUTE);
        fileName += calendar.get(Calendar.SECOND);
        fileName += calendar.get(Calendar.MILLISECOND);
        fileName += extName;
        
        return fileName;
    }
}
 
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servlet-context.xml

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<beans:bean name="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <beans:property name="maxUploadSize" value="10000000"></beans:property> //업로드 사이즈 제한
        <beans:property name="maxInMemorySize" value="100000"></beans:property> //메모리 최대 사이즈 제한
        <beans:property name="uploadTempDir" value="temp"></beans:property>
        <beans:property name="defaultEncoding" value="utf-8"></beans:property>
</beans:bean>
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