上传图片至fastdfs分布式文件系统并回显

事件，当我们浏览完图片选中一张时，触发onchange事件将图片上传到服务器并回显、

<img width="100" height="100" id="allUrl" src="${brand.imgUrl }"/>
<input type="hidden" name="imgUrl" id="imgUrl" value="${brand.imgUrl }"/>
<input type="file" name="pic" onchange="uploadPic()"/>

uploadPic()方法：

//上传图片
function uploadPic(){
    //jquery.form.js
    var options = {
            url : "/upload/uploadPic.do",
            dataType : "json",
            type : "post",
            success : function(data){
                $("#allUrl").attr("src",data.url);
                $("#imgUrl").val(data.url);
            }
    }
    $("#jvForm").ajaxSubmit(options);
}

Springmvc配置上传图片

<!-- 图片上传 -->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"/>

FastDFS的Java接口使用

全局配置文件 fdfs_client.conf

# connect timeout in seconds
# default value is 30s
connect_timeout=30

# network timeout in seconds
# default value is 30s
network_timeout=60

# the base path to store log files
base_path=/home/fastdfs

# tracker_server can ocur more than once, and tracker_server format is
#  "host:port", host can be hostname or ip address
tracker_server=119.29.146.187:22122
#tracker_server=119.29.146.187:22122

#standard log level as syslog, case insensitive, value list:
### emerg for emergency
### alert
### crit for critical
### error
### warn for warning
### notice
### info
### debug
log_level=info

# if use connection pool
# default value is false
# since V4.05
use_connection_pool = false

# connections whose the idle time exceeds this time will be closed
# unit: second
# default value is 3600
# since V4.05
connection_pool_max_idle_time = 3600

# if load FastDFS parameters from tracker server
# since V4.05
# default value is false
load_fdfs_parameters_from_tracker=false

# if use storage ID instead of IP address
# same as tracker.conf
# valid only when load_fdfs_parameters_from_tracker is false
# default value is false
# since V4.05
use_storage_id = false

# specify storage ids filename, can use relative or absolute path
# same as tracker.conf
# valid only when load_fdfs_parameters_from_tracker is false
# since V4.05
storage_ids_filename = storage_ids.conf


#HTTP settings
http.tracker_server_port=80

#use "#include" directive to include HTTP other settiongs
##include http.conf

工具类：FastDFSUtils

public class FastDFSUtil {

    public static String uploadPic(byte[] pic ,String name,long size){
        String path = null;
        //ClientGloble 读配置文件
        ClassPathResource resource = new ClassPathResource("fdfs_client.conf");
        try {
            ClientGlobal.init(resource.getClassLoader().getResource("fdfs_client.conf").getPath());
            //老大客户端
            TrackerClient trackerClient = new TrackerClient();
            TrackerServer trackerServer = trackerClient.getConnection();
            StorageServer storageServer  = null;
            StorageClient1 storageClient1 = new StorageClient1(trackerServer, storageServer);
            String ext = FilenameUtils.getExtension(name);
            
            NameValuePair[] meta_list = new NameValuePair[3];
            meta_list[0] = new NameValuePair("fileName",name);
            meta_list[1] = new NameValuePair("fileExt",ext);
            meta_list[2] = new NameValuePair("fileSize",String.valueOf(size));
            
            path = storageClient1.upload_file1(pic, ext, meta_list);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return path;
    }
}

保存图片到FastDFS分布式文件系统

@Service("uploadService")
public class UploadServiceImpl implements UploadService {

    //上传图片
    public String uploadPic(byte[] pic ,String name,long size) {
        
        return FastDFSUtil.uploadPic(pic, name, size);
    }
}

controller：

@Controller
public class UploadController {
    
    @Autowired UploadService uploadService;
    //上传图片
    @RequestMapping(value="/upload/uploadPic.do")
    public void uploadPic(@RequestParam(required = false) MultipartFile pic,HttpServletResponse response) throws IOException{
        
        String path = uploadService.uploadPic(pic.getBytes(), pic.getOriginalFilename(), pic.getSize());
        String url = Constants.img_url+path;
        JSONObject jo = new JSONObject();
        jo.put("url", url);
        response.setContentType("application/json;charset=UTF-8");
        response.getWriter().write(jo.toString());
    }
}