检验上传图片大小、尺寸、类型的两种实现方案

web开发作者:dayu日期:11天前点击:7
技术分享
 1 <%@ page language="java" contenttype="text/html; charset=UTF-8" pageencoding="UTF-8"%>
 2 <%@ include file="../common/common_tags.jsp" %>
 3 <!DOCTYPE html>
 4 <html lang="en">
 5 <head>
 6 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
 7 <title>素材列表&gt;图片编辑</title>
 8 </head>
 9 <body>
10 <form action="${path}/materialImage/update.do" method="post">
11     <input type="file" id="sdfile" name="sdfile" onchange="preImg(this.id,‘preview_2‘);">
12 </form>
13 <div id="tip1">
14 </div>
15 <div id="tip2">
16 </div>
17 <script>
18 /**图片的大小要求,不超过80KB,单位是KB*/
19 var size = "80";
20 /**图片的类型要求(即文件后缀)*/
21 var suffix = "jpg,png";
22 /**图片宽高要求,单位是px*/  
23 var width = "640";
24 var height = "530";
25 var suffixList ="";
26 function preImg(fileid, previewid) 
27 {    
28     var name = document.getElementById(fileid).files[0].name;
29     var curSize = document.getElementById(fileid).files[0].size;
30     var curSuffix = name.split(".")[1];
31     console.info(document.getElementById(fileid).files[0])
32     //1、判断图片大小
33     if(curSize>size*1024)
34     {
35         alert("图片大小不能超过"+size+"KB!");
36         return;
37     }  
38     //2、判断图片类型
39     if(suffix.indexOf(curSuffix)==-1)
40     {
41         suffixList="图片只能以";
42         for(var j=0;j<suffix.split(",").length;j++)
43         {
44             if(j==0)
45             {
46                 suffixList+="."+suffix.split(",")[j];
47             }
48             else
49             {
50                 suffixList+="或."+suffix.split(",")[j];
51             }
52         }
53         suffixList+="结尾!"
54         alert(suffixList+"");
55         return;
56     }
57     /*
58    3、 判断图片的尺寸(即宽和高)
59       现在的问题是,如何读取图片的宽、高
60       我这里是通过实例化Image对象、加载src 来获取。    
61     */
62     var reader = new FileReader();  
63     var picpreview = document.getElementById(previewid);    
64     reader.onload = function(e) { 
65         var data = e.target.result;
66         //加载图片获取图片真实宽度和高度
67         var image = new Image();
68         image.onload=function(){
69             var w = image.width;
70             var h = image.height;
71             if(w!=width || h!=height)
72             {
73                 alert("请上传尺寸为尺寸为"+width+"x"+height"的图片,当前图片尺寸为"+w+"x"+h+"!");
74                 return;
75             }
76         }
77         image.src= data;
78         picpreview.innerHTML = "<img src=‘"+this.result+"‘ class=‘‘ style=‘height: 282px;‘ />";    
79     }  
80     reader.readAsDataURL(document.getElementById(fileid).files[0]);  
81 }
82 </script>

View Code

第二种:放到服务器端校验

首先看用到jsp页面是如下

技术分享技术分享
 1 <%@ page language="java" contenttype="text/html; charset=UTF-8" pageencoding="UTF-8"%>
 2 <%@ include file="../common/common_tags.jsp" %>
 3 <!DOCTYPE html>
 4 <html lang="en">
 5 <head>
 6 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
 7 <title>素材列表&gt;图片编辑</title>
 8 </head>
 9 <body>
10 <form action="${path}/materialImage/update.do" method="post">
11     <input type="file" id="sdfile" name="sdfile" onchange="preImg(this.id ,‘preview_2‘);">
12 </form>
13 <div id="tip1">
14 </div>
15 <div id="tip2">
16 </div>
17 <script>
18 function preImg(fileid, previewid) 
19 {    
20     //异步校验图片格式
21 $.ajax({
22     type: "POST",
23     url: "${path}/materialImage/imageCheck.do",
24     data: formdata,
25     contentType: false,
26     processData: false,
27     async: false,
28     cache: false,
29     success: function(data) {
30         if (data.result == 0) {
31             alert("请上传图片JPG或GIF格式的图片!!");
32             errorCount++;
33         } else if (data.result == 1) {
34             alert("请上传图片格式等于" + imgWidth + "×" + imgHeight + " 格式的图片!!");
35         } else if (data.result == 2) {
36             imgSize = data.imageSize;
37             alert("图片大于" + data.imageSize + "K!");
38         } 
39     }
40 }
41 </script>

View Code

再看服务器端代码

技术分享技术分享
  1 package com.lutongnet.cps.material.controller;
  2 
  3 import java.awt.image.BufferedImage;
  4 import java.io.File;
  5 import java.io.IOException;
  6 import java.util.ArrayList;
  7 import java.util.Date;
  8 import java.util.HashMap;
  9 import java.util.Iterator;
 10 import java.util.List;
 11 import java.util.Map;
 12 
 13 import javax.annotation.Resource;
 14 import javax.imageio.ImageIO;
 15 import javax.imageio.ImageReader;
 16 import javax.imageio.stream.ImageInputStream;
 17 import javax.servlet.http.HttpServletRequest;
 18 
 19 import org.apache.commons.fileupload.disk.DiskFileItem;
 20 import org.slf4j.Logger;
 21 import org.slf4j.LoggerFactory;
 22 import org.springframework.http.HttpHeaders;
 23 import org.springframework.stereotype.Controller;
 24 import org.springframework.ui.Model;
 25 import org.springframework.web.bind.annotation.ModelAttribute;
 26 import org.springframework.web.bind.annotation.RequestMapping;
 27 import org.springframework.web.bind.annotation.RequestParam;
 28 import org.springframework.web.bind.annotation.ResponseBody;
 29 import org.springframework.web.multipart.MultipartHttpServletRequest;
 30 import org.springframework.web.multipart.commons.CommonsMultipartFile;
 31 
 32 
 33 /**
 34  * 图片素材Controller
 35  * @author     hehaitao
 36  * @since      1.0
 37  */
 38 @Controller
 39 @RequestMapping(value = "/materialImage")
 40 public class MaterialImageController2 
 41 {
 42     private static Logger log = LoggerFactory.getLogger(MaterialImageController2.class);
 43     
 44    @RequestMapping(value = "/imageCheck")
 45    @ResponseBody
 46    public Map<String,Object> imageCheck(HttpServletRequest request) 
 47            throws IOException
 48    {
 49        Map<String, Object> jsonMap = new HashMap<String, Object>();
 50        MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
 51        CommonsMultipartFile file = (CommonsMultipartFile) multipartRequest.getFile("file");
 52        DiskFileItem fi = (DiskFileItem)file.getFileItem(); 
 53        File bigFile = fi.getStoreLocation();
 54        
 55        //判断图片格式必须为JPEG才开始上传
 56        if(checkImageType(bigFile, "JPEG") && (checkImageType(bigFile, "gif")) )
 57        {
 58               log.error("image type error!");
 59            jsonMap.put("result", 0);
 60        }
 61    
 62        if(checkImageElement(bigFile, 1280, 720))
 63        {
 64            log.error("image element error!");
 65            jsonMap.put("result", 1);
 66        }
 67        if(checkImageSize(bigFile, 400) && checkImageType(bigFile, "gif"))
 68        {
 69            log.error("image size too large!");
 70            jsonMap.put("imageName","上传的高清gif");
 71            jsonMap.put("imageSize",400);
 72            jsonMap.put("result", 2);
 73        }
 74        if(checkImageSize(bigFile, 100) && checkImageType(bigFile, "JPEG"))
 75        {
 76            log.error("image size too large!");
 77            jsonMap.put("imageName","上传的高清jpg");
 78            jsonMap.put("imageSize",100);
 79            jsonMap.put("result", 3);
 80        }
 81           
 82        return jsonMap;
 83    }
 84    
 85     /**
 86      * 图片后缀的格式检验
 87      * @param file  文件
 88      * @param imageType  后缀格式,如"JPEG,png.."
 89      * @return true:符合imageType格式; false:不符合
 90      * @throws IOException
 91      */
 92     public static boolean checkImageType(File file, String imageType) throws IOException
 93    {
 94         if(!file.exists())
 95         {
 96             return false;
 97         }
 98            boolean result = false;
 99            ImageInputStream iis = ImageIO.createImageInputStream(file);  
100            Iterator<ImageReader> readers = ImageIO.getImageReaders(iis); 
101            ImageReader reader = null;
102            if(readers.hasNext())
103            {
104                reader = readers.next();
105            }
106            if(reader.getFormatName().equals(imageType))
107            {
108                result = true;
109            }
110            //System.out.println(reader.getFormatName());
111            return result;
112    }
113     
114     /**
115      * 图片的像素判断
116      * @param file  文件
117      * @param imageWidth  图片宽度
118      * @param imageHeight   图片高度
119      * @return true:上传图片宽度和高度都小于等于规定最大值
120      * @throws IOException
121      */
122     public static boolean checkImageElement(File file, int imageWidth, int imageHeight) throws IOException
123     {
124         boolean result = false;
125            if(!file.exists())
126            {
127                return false;
128            }
129            BufferedImage bufferedImage = ImageIO.read(file);
130            if(bufferedImage != null && bufferedImage.getHeight() == imageHeight && bufferedImage.getWidth() == imageWidth)
131            {
132                result = true;
133            }
134            return result;
135     }
136     
137     /**
138      * 检测图片的大小
139      * @param file 文件
140      * @param imageSize 图片最大值(KB)
141      * @return true:上传图片小于图片的最大值
142      */
143     public static boolean checkImageSize(File file, int imageSize)
144     {
145         boolean result = false;
146         if(!file.exists())
147         {
148             return false;
149         }
150         if((file.length() / 1024) <= imageSize)
151         {
152             result = true;
153         }
154         
155         return result;
156     }
157     
158    
159     
160 }

View Code

检验上传图片大小、尺寸、类型的两种实现方案

原文地址:http://www.cnblogs.com/zishengY/p/7241051.html


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