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==)
             return ;
         else
             return ;
     }

 public class ConnOrcl {

         private static Connection conn;
         private static Statement stat;
         private static String driver = "oracle.jdbc.driver.OracleDriver";
         private static int SUCCESS=;
         private static int FILE=;
         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();
 }