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

@RequestMapping(params="upLoadPicture") 
    @ResponseBody
    public String addFilemsgPic(MultipartFile file,HttpServletRequest request) throws Exception{
        
        String path="../Manage_ssm/upLoadPicture";
        
        //创建文件 
        File dir=new File(path);
        if(!dir.exists()){
            dir.mkdirs();
        }
        
        String username=(String) request.getSession().getAttribute("userName");
        //返回原来在客户端的文件系统的文件名
        String fileName=file.getOriginalFilename();
        //username+后缀名
    
        String img=username+fileName.substring(fileName.lastIndexOf("."));//zhao.jpg
        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。
        
        imgOut.write(file.getBytes());//返回一个字节数组文件的内容
        imgOut.close();
        Map<String, String> map=new HashMap<String, String>();
    
        String rpath = path+"/"+img;
        map.put("rPath",rpath);
        JSONObject jsonObject = JSONObject.fromObject(map);//将json字符串转换为json对象
        String r=jsonObject.toString();
        String s=URLEncoder.encode(r, "utf-8");//加密
        return s;
    }

@RequestMapping(params="pictureToDb") 
    @ResponseBody
    public int pictureToDb(String src,HttpServletRequest request){
    
       
        String newSrc = src.replace(" ", "+");
        int flag=ConnOrcl.connToTable(newSrc,request);
        if(flag==1)
            return 1;
        else
            return 2;
    }

public class ConnOrcl {
    
        private static Connection conn;  
        private static Statement stat;  
        private static String driver = "oracle.jdbc.driver.OracleDriver";  
        private static int SUCCESS=1; 
        private static int FILE=2; 
        public static int connToTable(String file,HttpServletRequest request)  
        {  
            try  
            {  
                //数据库连接  
                Class.forName(driver);  
                conn = java.sql.DriverManager.getConnection("jdbc:oracle:thin:@127.0.0.1:1521:orcl", "GKBMFZXT", "GKBMFZXT");  
                stat = conn.createStatement();  
               
                String username=(String) request.getSession().getAttribute("userName");             
                String sql="update user_table set picture='"+file+"' where user_name='"+username+"'";      
                stat.execute(sql.toString());  
                   
                return SUCCESS;
            }  
            catch(ClassNotFoundException e)  
            {  
                e.printStackTrace();  
            }  
            catch(SQLException e)  
            {  
                e.printStackTrace();  
            }  
            finally  
            {  
                if(null != stat)  
                {  
                    try   
                    {  
                        stat.close();  
                    }   
                    catch (SQLException e)  
                    {  
                        e.printStackTrace();  
                    }  
                }  
                if(null != conn)  
                {  
                    try   
                    {  
                        conn.close();  
                    }   
                    catch (SQLException e)   
                    {  
                        e.printStackTrace();  
                    }  
                }  
            }  
            return FILE;
        }  

}

<script src="js/ajaxfileupload.js"></script>
<script type="text/javascript">
function upload(){
    
    var file="file";
    var picElement=document.getElementById(file).value;
    
    var picFormat=picElement.substring(picElement.lastIndexOf('.')+1,picElement.length);
    if(picFormat!="jpg"){
        alert("请选择jpg 格式的文件!");
        return;
    }

    $.ajaxFileUpload({
             url:"user.do?upLoadPicture",
           secureuri: false,
           fileElementId:file,
           dataType: 'JSON',
           success:function(data){
                  data=decodeURIComponent(data);//解码
                  var arr=JSON.parse(data);//JSON.parse() 方法解析一个JSON字符串            
                $("#fsrc").val(arr.rPath);         
                 $.post(
                        "user.do?pictureToDb&src="+$("#fsrc").val(),    
                        function(data){
                            //data=decodeURIComponent(data);
                            //var arr=JSON.parse(data);
                            if(data==1){
                            alert("上传成功！");
                            }else{
                            alert("上传失败！");
                            }

                        }
                    ); 
        },
        error: function (){
               alert("上传失败!当前时间为:"+new Date().toLocaleTimeString());
          
       }
    });
};

function findFile(){
    document.getElementById("file").click();
}