spring boot实现图片的上传和下载功能

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              这篇博客简单介绍下spring boot下图片上传和下载,已经遇到的问题。首先需要创建一个spring boot项目。

 1,核心的controller代码

package com.qwrt.station.websocket.controller;import com.alibaba.fastjson.JSONObject;import com.qwrt.station.common.util.JsonUtil;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.beans.factory.annotation.Value;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.RequestParam;import org.springframework.web.bind.annotation.RestController;import org.springframework.web.multipart.MultipartFile;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.*;/** * Created by jack on 2017/10/30. */@RestController@RequestMapping("v1/uploadDownload")public class UploadDownloadController {    private static final Logger logger = LoggerFactory.getLogger(UploadDownloadController.class);    @Value("${uploadDir}")    private String uploadDir;    @RequestMapping(value = "/uploadImage", method = RequestMethod.POST)    public JSONObject uploadImage(@RequestParam(value = "file") MultipartFile file) throws RuntimeException {        if (file.isEmpty()) {            return JsonUtil.getFailJsonObject("文件不能为空");        }        // 获取文件名        String fileName = file.getOriginalFilename();        logger.info("上传的文件名为:" + fileName);        // 获取文件的后缀名        String suffixName = fileName.substring(fileName.lastIndexOf("."));        logger.info("上传的后缀名为:" + suffixName);        // 文件上传后的路径        String filePath = uploadDir;        // 解决中文问题,liunx下中文路径,图片显示问题        // fileName = UUID.randomUUID() + suffixName;        File dest = new File(filePath + fileName);        // 检测是否存在目录        if (!dest.getParentFile().exists()) {            dest.getParentFile().mkdirs();        }        try {            file.transferTo(dest);            logger.info("上传成功后的文件路径未:" + filePath + fileName);            return JsonUtil.getSuccessJsonObject(fileName);        } catch (IllegalStateException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }        return JsonUtil.getFailJsonObject("文件上传失败");    }    //文件下载相关代码    @RequestMapping(value = "/downloadImage",method = RequestMethod.GET)    public String downloadImage(String imageName,HttpServletRequest request, HttpServletResponse response) {        //String fileName = "123.JPG";        logger.debug("the imageName is : "+imageName);        String fileUrl = uploadDir+imageName;        if (fileUrl != null) {            //当前是从该工程的WEB-INF//File//下获取文件(该目录可以在下面一行代码配置)然后下载到C:\\users\\downloads即本机的默认下载的目录           /* String realPath = request.getServletContext().getRealPath(                    "//WEB-INF//");*/            /*File file = new File(realPath, fileName);*/            File file = new File(fileUrl);            if (file.exists()) {                response.setContentType("application/force-download");// 设置强制下载不打开                response.addHeader("Content-Disposition",                        "attachment;fileName=" + imageName);// 设置文件名                byte[] buffer = new byte[1024];                FileInputStream fis = null;                BufferedInputStream bis = null;                try {                    fis = new FileInputStream(file);                    bis = new BufferedInputStream(fis);                    OutputStream os = response.getOutputStream();                    int i = bis.read(buffer);                    while (i != -1) {                        os.write(buffer, 0, i);                        i = bis.read(buffer);                    }                    System.out.println("success");                } catch (Exception e) {                    e.printStackTrace();                } finally {                    if (bis != null) {                        try {                            bis.close();                        } catch (IOException e) {                            e.printStackTrace();                        }                    }                    if (fis != null) {                        try {                            fis.close();                        } catch (IOException e) {                            e.printStackTrace();                        }                    }                }            }        }        return null;    }}

     上面的代码有两个方法,上面的方法是图片上传的方法,下面的方法是图片下载的方法。下载图片需要传入图片的文件名,在ios,android手机,谷歌浏览器测试,上传下载没有问题。


2,测试的html的核心代码如下,进行图片的上传和下载:

<!DOCTYPE html><html><head><meta charset="UTF-8" /><title>websocket chat</title></head><body><div><label>输入信息:</label><input id="id" width="100px" /><br /><button id="btn">发送消息</button>    <button id="connection">websocket连接</button>     <button id="disconnection">断开websocket连接</button><br /><br /><form enctype="multipart/form-data" id="uploadForm">          <input type="file" name="uploadFile" id="upload_file" style="margin-bottom:10px;">            <input type="button" id="uploadPicButton" value="上传" onclick="uploadImage()">         </form><!--<input type="file" onchange="uploadImgTest();" id="uploadImg" name="uploadImg" /><button id="uploadImage" onclick="uploadImage();">上传</button>--></div><div id="test"></div><hr color="blanchedalmond"/><div id="voiceDiv"></div><hr color="chartreuse" /><div id="imgDiv" style="width: 30%;height: 30%;"><img src="http://192.168.9.123:8860/v1/uploadDownload/downloadImage?imageName=123.JPG" style="width: 160px;height: 160px;"/></div></body><script src="js/jquery-3.2.1.min.js"></script><!--<script th:src="@{stomp.min.js}"></script>--><script src="js/sockjs.min.js"></script><script>var websocketUrl = "ws://192.168.9.123:8860/webSocketServer";var websocket;if('WebSocket' in window) {//websocket = new WebSocket("ws://" + document.location.host + "/webSocketServer");//websocket = new WebSocket("ws://192.168.9.123:9092/webSocketServer");//websocket = new WebSocket("ws://localhost:8860/webSocketServer");websocket = new WebSocket(websocketUrl);} else if('MozWebSocket' in window) {websocket = new MozWebSocket("ws://" + document.location.host + "/webSocketServer");} else {websocket = new SockJS("http://" + document.location.host + "/sockjs/webSocketServer");}websocket.onopen = function(evnt) {console.log("onopen----", evnt.data);};websocket.onmessage = function(evnt) {//$("#test").html("(<font color='red'>" + evnt.data + "</font>)");console.log("onmessage----", evnt.data);//$("#test").html(evnt.data);$("#test").append('<div>' + event.data + '</div>');};websocket.onerror = function(evnt) {console.log("onerror----", evnt.data);}websocket.onclose = function(evnt) {console.log("onclose----", evnt.data);}$('#btn').on('click', function() {if(websocket.readyState == websocket.OPEN) {var msg = $('#id').val();//调用后台handleTextMessage方法websocket.send(msg);} else {alert("连接失败!");}});$('#disconnection').on('click', function() {if(websocket.readyState == websocket.OPEN) {websocket.close();//websocket.onclose();console.log("关闭websocket连接成功");}});$('#connection').on('click', function() {if(websocket.readyState == websocket.CLOSED) {websocket.open();//websocket.onclose();console.log("打开websocket连接成功");}});//监听窗口关闭事件,当窗口关闭时,主动去关闭websocket连接,防止连接还没断开就关闭窗口,server端会抛异常。window.onbeforeunload = function() {websocket.close();}function uploadImgTest() {}function uploadImage(){//var uploadUrl = "http://localhost:8860/v1/uploadDownload/uploadImage";var uploadUrl = "http://192.168.9.123:8860/v1/uploadDownload/uploadImage";var downUrl = "http://192.168.9.123:8860/v1/uploadDownload/downloadImage"var pic = $('#upload_file')[0].files[0];        var fd = new FormData();        //fd.append('uploadFile', pic);        fd.append('file', pic);        $.ajax({            url:uploadUrl,            type:"post",            // Form数据            data: fd,            cache: false,            contentType: false,            processData: false,            success:function(data){            console.log("the data is : {}",data);            if(data.code == 0){            console.log("上传成功后的文件路径为:"+data.data);            var img = $("<img />")            img.attr("src",downUrl+"?imageName="+data.data);            img.width("160px");            img.height("160px");            $("#imgDiv").append(img);            }                            }        });}</script></html>

        上面的代码有些和图片的上传和下载没有关系,根据需要自己去掉,看图片上传和下载的核心代码,需要引入jquery。


3,spring boot的属性配置:

1,解决图片上传太大的问题:

spring:
  http:    multipart:       max-file-size: 100Mb   #文件上传大小        max-request-size: 200Mb  #最打请求大小

spring:
  http:
      multipart:
        max-file-size: 100Mb   #文件上传大小
        max-request-size: 200Mb  #最打请求大小

这是新版spring boot解决图片或者文件上传太大的问题,老板的不是这样解决的。可以自己查资料

2,配置文件上传保存的位置:



#上传位置
uploadDir: F:\mystudy\pic\



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