java实现上传图片

1.将图片上传到tomcat下

2.将相对路径存放到数据库中

 1 @RequestMapping(params="upLoadPicture") 
 2     @ResponseBody
 3     public String addFilemsgPic(MultipartFile file,HttpServletRequest request) throws Exception{
 4         
 5         String path="../Manage_ssm/upLoadPicture";
 6         
 7         //创建文件 
 8         File dir=new File(path);
 9         if(!dir.exists()){
10             dir.mkdirs();
11         }
12         
13         String username=(String) request.getSession().getAttribute("userName");
14         //返回原来在客户端的文件系统的文件名
15         String fileName=file.getOriginalFilename();
16         //username+后缀名
17     
18         String img=username+fileName.substring(fileName.lastIndexOf("."));//zhao.jpg
19         FileOutputStream imgOut=new FileOutputStream(new File(dir,img));//根据 dir 抽象路径名和 img 路径名字符串创建一个新 File 实例。
20         
21         imgOut.write(file.getBytes());//返回一个字节数组文件的内容
22         imgOut.close();
23         Map<String, String> map=new HashMap<String, String>();
24     
25         String rpath = path+"/"+img;
26         map.put("rPath",rpath);
27         JSONObject jsonObject = JSONObject.fromObject(map);//将json字符串转换为json对象
28         String r=jsonObject.toString();
29         String s=URLEncoder.encode(r, "utf-8");//加密
30         return s;
31     }

 1 @RequestMapping(params="pictureToDb") 
 2     @ResponseBody
 3     public int pictureToDb(String src,HttpServletRequest request){
 4     
 5        
 6         String newSrc = src.replace(" ", "+");
 7         int flag=ConnOrcl.connToTable(newSrc,request);
 8         if(flag==1)
 9             return 1;
10         else
11             return 2;
12     }

 1 public class ConnOrcl {
 2     
 3         private static Connection conn;  
 4         private static Statement stat;  
 5         private static String driver = "oracle.jdbc.driver.OracleDriver";  
 6         private static int SUCCESS=1; 
 7         private static int FILE=2; 
 8         public static int connToTable(String file,HttpServletRequest request)  
 9         {  
10             try  
11             {  
12                 //数据库连接  
13                 Class.forName(driver);  
14                 conn = java.sql.DriverManager.getConnection("jdbc:oracle:thin:@127.0.0.1:1521:orcl", "GKBMFZXT", "GKBMFZXT");  
15                 stat = conn.createStatement();  
16                
17                 String username=(String) request.getSession().getAttribute("userName");             
18                 String sql="update user_table set picture='"+file+"' where user_name='"+username+"'";      
19                 stat.execute(sql.toString());  
20                    
21                 return SUCCESS;
22             }  
23             catch(ClassNotFoundException e)  
24             {  
25                 e.printStackTrace();  
26             }  
27             catch(SQLException e)  
28             {  
29                 e.printStackTrace();  
30             }  
31             finally  
32             {  
33                 if(null != stat)  
34                 {  
35                     try   
36                     {  
37                         stat.close();  
38                     }   
39                     catch (SQLException e)  
40                     {  
41                         e.printStackTrace();  
42                     }  
43                 }  
44                 if(null != conn)  
45                 {  
46                     try   
47                     {  
48                         conn.close();  
49                     }   
50                     catch (SQLException e)   
51                     {  
52                         e.printStackTrace();  
53                     }  
54                 }  
55             }  
56             return FILE;
57         }  
58 
59 }

 1 <script src="js/ajaxfileupload.js"></script>
 2 <script type="text/javascript">
 3 function upload(){
 4     
 5     var file="file";
 6     var picElement=document.getElementById(file).value;
 7     
 8     var picFormat=picElement.substring(picElement.lastIndexOf('.')+1,picElement.length);
 9     if(picFormat!="jpg"){
10         alert("请选择jpg 格式的文件!");
11         return;
12     }
13 
14     $.ajaxFileUpload({
15              url:"user.do?upLoadPicture",
16            secureuri: false,
17            fileElementId:file,
18            dataType: 'JSON',
19            success:function(data){
20                   data=decodeURIComponent(data);//解码
21                   var arr=JSON.parse(data);//JSON.parse() 方法解析一个JSON字符串            
22                 $("#fsrc").val(arr.rPath);         
23                  $.post(
24                         "user.do?pictureToDb&src="+$("#fsrc").val(),    
25                         function(data){
26                             //data=decodeURIComponent(data);
27                             //var arr=JSON.parse(data);
28                             if(data==1){
29                             alert("上传成功！");
30                             }else{
31                             alert("上传失败！");
32                             }
33 
34                         }
35                     ); 
36         },
37         error: function (){
38                alert("上传失败!当前时间为:"+new Date().toLocaleTimeString());
39           
40        }
41     });
42 };
43 
44 function findFile(){
45     document.getElementById("file").click();
46 }

 

来源：https://www.cnblogs.com/xiaotian-222/p/6962351.html