SpringMVC的文件上传

1.客户端(ajax)

function submitImgSize1Upload(){    var option={            type:'POST',            url:'${pageContext.request.contextPath }/upload/uploadPic.do',            dataType:'text',            data:{                fileName : 'imgSize1File'            },            success:function(data){                //把json格式的字符串转换成json对象                var jsonObj = $.parseJSON(data);                //返回服务器图片路径，把图片路径设置给img标签                $("#imgSize1ImgSrc").attr("src",jsonObj.fullPath);                //数据库保存相对路径                $("#imgSize1").val(jsonObj.relativePath);            }        };    $("#itemForm").ajaxSubmit(option);}</script>

客户端采用ajaxSubmit的方式上传图片文件。

2. 服务器端

在springmvc.xml中配置

<!-- 文件上传解析器 -->      <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">        <property name="maxUploadSize" value="10240000"></property>    </bean>

@Controller@RequestMapping("/upload")public class UploadController {    @RequestMapping("uploadPic")    public void uploadPic(HttpServletRequest request,String fileName,PrintWriter out){        //把Request强转成多部件请求对象        MultipartHttpServletRequest mh = (MultipartHttpServletRequest) request;        //根据文件名称获取文件对象        CommonsMultipartFile cm = (CommonsMultipartFile) mh.getFile(fileName);        //获取文件上传流        byte[] fbytes = cm.getBytes();        //文件名称在服务器有可能重复？        String newFileName="";        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmssSSS");        newFileName = sdf.format(new Date());        Random r = new Random();        for(int i =0 ;i<3;i++){            newFileName=newFileName+r.nextInt(10);        }        //获取文件扩展名        String originalFilename = cm.getOriginalFilename();        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));        //创建jesy服务器，进行跨服务器上传        Client client = Client.create();        //把文件关联到远程服务器        WebResource resource = client.resource(Commons.PIC_HOST+"/upload/"+newFileName+suffix);        //上传        resource.put(String.class, fbytes);        //ajax回调函数需要会写写什么东西？        //图片需要回显：需要图片完整路径        //数据库保存图片的相对路径.        String fullPath = Commons.PIC_HOST+"/upload/"+newFileName+suffix;        String relativePath="/upload/"+newFileName+suffix;        //{"":"","":""}        String result="{\"fullPath\":\""+fullPath+"\",\"relativePath\":\""+relativePath+"\"}";        out.print(result);    }}

2.1 上传过程中需注意两次类型强转

MultipartHttpServletRequest CommonsMultipartFile
代码片段如下：

//把Request强转成多部件请求对象        MultipartHttpServletRequest mh = (MultipartHttpServletRequest) request;        //根据文件名称获取文件对象        CommonsMultipartFile cm = (CommonsMultipartFile) mh.getFile(fileName);        //获取文件上传流        byte[] fbytes = cm.getBytes();

2.2 服务器端采用jersey框架实现跨服务器上传

代码片段如下：

        //创建jesy服务器，进行跨服务器上传        Client client = Client.create();        //把文件关联到远程服务器        WebResource resource = client.resource(Commons.PIC_HOST+"/upload/"+newFileName+suffix);        //上传        resource.put(String.class, fbytes);