今天就跟大家聊聊有關(guān)使用spring boot怎么實現(xiàn)圖片上傳和下載功能,可能很多人都不太了解,為了讓大家更加了解,小編給大家總結(jié)了以下內(nèi)容,希望大家根據(jù)這篇文章可以有所收獲。

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1、核心的controller代碼
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("文件不能為空");
}
// 獲取文件名
String fileName = file.getOriginalFilename();
logger.info("上傳的文件名為:" + fileName);
// 獲取文件的后綴名
String suffixName = fileName.substring(fileName.lastIndexOf("."));
logger.info("上傳的后綴名為:" + suffixName);
// 文件上傳后的路徑
String filePath = uploadDir;
// 解決中文問題,liunx下中文路徑,圖片顯示問題
// fileName = UUID.randomUUID() + suffixName;
File dest = new File(filePath + fileName);
// 檢測是否存在目錄
if (!dest.getParentFile().exists()) {
dest.getParentFile().mkdirs();
}
try {
file.transferTo(dest);
logger.info("上傳成功后的文件路徑未:" + filePath + fileName);
return JsonUtil.getSuccessJsonObject(fileName);
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return JsonUtil.getFailJsonObject("文件上傳失敗");
}
//文件下載相關(guān)代碼
@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) {
//當(dāng)前是從該工程的WEB-INF//File//下獲取文件(該目錄可以在下面一行代碼配置)然后下載到C:\\users\\downloads即本機(jī)的默認(rèn)下載的目錄
/* 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");// 設(shè)置強(qiáng)制下載不打開
response.addHeader("Content-Disposition",
"attachment;fileName=" + imageName);// 設(shè)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;
}
}上面的代碼有兩個方法,上面的方法是圖片上傳的方法,下面的方法是圖片下載的方法。下載圖片需要傳入圖片的文件名,在ios,android手機(jī),谷歌瀏覽器測試,上傳下載沒有問題。
2、測試的html的核心代碼如下,進(jìn)行圖片的上傳和下載:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title>websocket chat</title>
</head>
<body>
<div>
<label>輸入信息:</label><input id="id" width="100px" /><br />
<button id="btn">發(fā)送消息</button>
<button id="connection">websocket連接</button>
<button id="disconnection">斷開websocket連接</button>
<br /><br />
<form enctype="multipart/form-data" id="uploadForm">
<input type="file" name="uploadFile" id="upload_file" >
<input type="button" id="uploadPicButton" value="上傳" onclick="uploadImage()">
</form>
<!--<input type="file" onchange="uploadImgTest();" id="uploadImg" name="uploadImg" />
<button id="uploadImage" onclick="uploadImage();">上傳</button>-->
</div>
<div id="test">
</div>
<hr color="blanchedalmond"/>
<div id="voiceDiv">
</div>
<hr color="chartreuse" />
<div id="imgDiv" >
<img src="http://192.168.9.123:8860/v1/uploadDownload/downloadImage?imageName=123.JPG" />
</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();
//調(diào)用后臺handleTextMessage方法
websocket.send(msg);
} else {
alert("連接失敗!");
}
});
$('#disconnection').on('click', function() {
if(websocket.readyState == websocket.OPEN) {
websocket.close();
//websocket.onclose();
console.log("關(guān)閉websocket連接成功");
}
});
$('#connection').on('click', function() {
if(websocket.readyState == websocket.CLOSED) {
websocket.open();
//websocket.onclose();
console.log("打開websocket連接成功");
}
});
//監(jiān)聽窗口關(guān)閉事件,當(dāng)窗口關(guān)閉時,主動去關(guān)閉websocket連接,防止連接還沒斷開就關(guān)閉窗口,server端會拋異常。
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數(shù)據(jù)
data: fd,
cache: false,
contentType: false,
processData: false,
success:function(data){
console.log("the data is : {}",data);
if(data.code == 0){
console.log("上傳成功后的文件路徑為:"+data.data);
var img = $("<img />")
img.attr("src",downUrl+"?imageName="+data.data);
img.width("160px");
img.height("160px");
$("#imgDiv").append(img);
}
}
});
}
</script>
</html>上面的代碼有些和圖片的上傳和下載沒有關(guān)系,根據(jù)需要自己去掉,看圖片上傳和下載的核心代碼,需要引入jquery。
3、spring boot的屬性配置:
1.解決圖片上傳太大的問題:
spring: http: multipart: max-file-size: 100Mb #文件上傳大小 max-request-size: 200Mb #最打請求大小
這是新版spring boot解決圖片或者文件上傳太大的問題,老板的不是這樣解決的。可以自己查資料
2.配置文件上傳保存的位置:
#上傳位置 uploadDir: F:\mystudy\pic\
springboot一種全新的編程規(guī)范,其設(shè)計目的是用來簡化新Spring應(yīng)用的初始搭建以及開發(fā)過程,SpringBoot也是一個服務(wù)于框架的框架,服務(wù)范圍是簡化配置文件。
看完上述內(nèi)容,你們對使用spring boot怎么實現(xiàn)圖片上傳和下載功能有進(jìn)一步的了解嗎?如果還想了解更多知識或者相關(guān)內(nèi)容,請關(guān)注創(chuàng)新互聯(lián)行業(yè)資訊頻道,感謝大家的支持。
網(wǎng)頁標(biāo)題:使用springboot怎么實現(xiàn)圖片上傳和下載功能
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