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How to get local images to display in the browser and upload them to the server in js
How to get local images to display in the browser and upload them to the server in js
The content of this article is about the browser displaying the preview of the local image and calling the back-end interface to upload the image to the server. It has certain reference value. Now I share it with everyone. Friends in need can refer to it. Let’s take a look
1. jsp page
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%><%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html>
<head>
<title></title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<META HTTP-EQUIV="pragma" CONTENT="no-cache">
<META HTTP-EQUIV="Cache-Control" CONTENT="no-cache, must-revalidate">
<META HTTP-EQUIV="expires" CONTENT="0">
<!-- 引入js -->
<script type="text/javascript" src="<%=request.getContextPath()%>/js/jquery.js"></script>
<script type="text/javascript" src="<%=request.getContextPath()%>/js/jquery.min.js"></script>
<body>
<p id="enteringInfor">
<form id="uploadForm" >
<p class="formItem" style="float:left">
<p class="itemBlock">
<p style="display:inline-block;float:left" class="selectContainer">
<span class="txtBox">姓名</span>
<input type="text" class="select" name="realName" id="realName" placeholder="请输入姓名" style="width:200px;">
</p>
</p>
<p class="itemBlock">
<p style="display:inline-block;float:left" class="selectContainer">
<span class="txtBox">性别</span>
<select class="select" name="gender" id="gender" >
<option value="1">男</option>
<option value="2">女</option>
</select>
</p>
</p>
</p>
<p class="formItem" style="float:right;margin-top:50px;">
<p class="picture">
<p class="layui-upload">
<p class="layui-upload-list" id="localImag">
<img class="layui-upload-img lazy" src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/article/000/099/200/2713c4c20388c1d561df6c4e69371e9b-0.png" id="userPic" style="max-width:90%" alt="How to get local images to display in the browser and upload them to the server in js" >
<p id="demoText"></p>
</p>
<p style="width:332px;position:absolute;bottom:0px">
<span >上传图片</span>
<input id="entrustPicUpload" type="file" name="entImg" onchange="getPhoto(this)" />
</p>
</p>
</p>
</p>
</form>
<p style="padding-left:24px;text-align:center;height:70px;line-height:70px;border:none;width:100%;overflow:hidden;zoom:1">
<button onclick="saveUser()">保存</button>
</p>
<input type="hidden" name="userId" id="userId"/>
</p><script>
var imgurl = "";
function getPhoto(node) {
var imgURL = "";
try{
var file = null;
if(node.files && node.files[0] ){
file = node.files[0];
}else if(node.files && node.files.item(0)) {
file = node.files.item(0);
}
//Firefox 因安全性问题已无法直接通过input[file].value 获取完整的文件路径
try{
imgURL = file.getAsDataURL();
}catch(e){
imgRUL = window.URL.createObjectURL(file);
}
}catch(e){
if (node.files && node.files[0]) {
var reader = new FileReader();
reader.onload = function (e) {
imgURL = e.target.result;
};
reader.readAsDataURL(node.files[0]);
}
}
creatImg(imgRUL);//显示图片
return imgURL;
}
function creatImg(imgRUL){
document.getElementById("userPic").src = imgRUL;
$('#userPic').viewer({
url: 'src',
});
}
//保存
function saveUser(){
//数据判断
var realName=$("#realName").val(); if(realName==null||realName==''){
layer.msg('用户名不能为空!',{icon : 7,time:1000}); return ;
} var imgSrc = $("#userPic").attr("src"); if(imgSrc == "" || imgSrc==null){
layer.msg('请上传图片!',{icon : 7,time:1000}); return ;
} var formData = new FormData($("#uploadForm")[0]);
$.ajax({
url : "../addUser",
type: 'POST',
data: formData,
async: false,
cache: false,
contentType: false,
processData: false,
success : function(data) {
var obj = JSON.parse(data);
layer.msg('保存成功!', {icon : 6,time : 2000});
},
error : function(data) {
layer.msg('保存失败!', {icon : 5,time : 2000});
}
});
} </script>
</body></html>2. Controller interface
/**
* 添加用户
* @param session
* @param request
* @param response
* @throws IOException
*/
@RequestMapping(value = "/addUser", method = RequestMethod.POST)
public void addUser(MultipartFile entImg,HttpSession session, HttpServletRequest request, HttpServletResponse response)
throws IOException {
String realName = request.getParameter("realName");//姓名
String gender = request.getParameter("gender");// 性别
//调用工具类上传图片
String userPic = FileUtils.uploadUser(entImg, request);
TestUser testUser = new TestUser();
testUser.setRealName(realName);
testUser.setGender(Integer.parseInt(gender));
testUser.setUserPic(userPic); // 添加人员信息及图片url到数据库
int res= userService.insertUser(testUser); if (res > 0) {
writeJSON(response, res);
} else {
writeJSON(response,null);
}
}3. Tools Category
public class FileUtils {
FILES_PATH("files_path"); // 此路径存放于jdbc.properties配置文件中，例如：files_path=D:/uploadImgs
private static final String path = PropertiesUtil.get(FILES_PATH)+"/user"; /**
* 上传图片URL
* @param fileName
* @param request
* @return
*/
public static String getPath(String fileName,HttpServletRequest request) {
String ip=IpUtil.getIP(); int port=request.getLocalPort();
StringBuilder sb=new StringBuilder();
sb.append("http://");
sb.append(ip);
sb.append(":");
sb.append(port);
sb.append("/uploadImgs/user/");
sb.append(fileName); return sb.toString();
} /**
* 以时间戳对上传文件进行重新命名
* @param file
* @return
*/
public static String renameFile(MultipartFile file) { if(file!=null) {
Long date=new Date().getTime();
String fileRealName=file.getOriginalFilename();
String prefix=fileRealName.substring(fileRealName.lastIndexOf(".")+1);
String fileName = date.toString()+"."+prefix;
return fileName;
} return null;
} /**
* 图片上传
* @param file
* @param fileName
*/
public static String uploadUser(MultipartFile file, HttpServletRequest request) { // 重命名
String renameFile = FileUtils.renameFile(file); // 图片名
String picPath = FileUtils.getPath(renameFile, request); // 上传
File targetFile = new File(borpath, renameFile); if (!targetFile.exists() && !targetFile.isDirectory()) {
targetFile.mkdirs();
} try {
file.transferTo(targetFile);
} catch (Exception e) {
e.printStackTrace();
} return picPath;
}
}4. Effect 
3. After the picture is uploaded successfully, save it to the specified location Under the folder 
4. Database data
## related Recommended:
HTML5 Crop the image locally and upload it to the server
Compress the local image and upload it to the server
JAVA uploads files and images to the server and saves them
Insert the WeChat editor article style Upload pictures to WeChat server
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