Springmvc3实现文件上传

Spring自己封装了文件上传功能，可以利用
MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest)request;
MultipartFile multFile = multiRequest.getFile("imgFile");

需要在springmvc-servlet.xml里配置：
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver" />

结合iframe实现局部刷新上传

代码：

1.JSP页面：

<form:form method="post" action="${ctx}/wzxxfbpdtp/save" target="hidden_frame" id="pdtpNewForm" enctype="multipart/form-data" modelAttribute="wzXxfbPdtp">
		<div class="pageContent" layoutH="30">
		<div class="pageFormContent" align="center" style="overflow: hidden;">
			<input type="hidden" name="imgPath" id="imgPath" />
			<table align="center" width="500px" height="300px" border="0" cellpadding="0" cellspacing="0" style="margin-top: 10px;text-align: center;border-spacing: 10px;">


				<tr>
					<td width="70px">选择图片</td>
					<td colspan="2"><input id="imgFile" name="imgFile" type="file" /></td>
				</tr>
			</table>
		</div>
		</div>
		<iframe name="hidden_frame" id="hidden_frame" src="message.html" style="display:none"></iframe>

	</form:form>

2 controller后台：

/** 保存新增,@Valid标注spirng在绑定对象时自动为我们验证对象属性并存放errors在BindingResult  */
	@RequestMapping(value = "/save")
	public String create(ModelMap model,@Valid WzXxfbPdtp wzXxfbPdtp,HttpServletRequest request,HttpServletResponse response)throws Exception  {
		MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest)request;
		MultipartFile multFile = multiRequest.getFile("imgFile");
		// 扩展名格式：
		String extName = "";
		String message = "";
		String newName = "";
		boolean flag = true;
		//取得上传的文件名
		String fileName = multFile.getOriginalFilename();
		if(fileName != null && !"".equals(fileName.trim())){
			//上传文件的大小
			long size = multFile.getSize();
			if(size > (1024*1024)){
				message = "只允许上传1M之内的图片";
				flag = false;
			}
			if (fileName.lastIndexOf(".") >= 0) {
				extName = fileName.substring(fileName.lastIndexOf("."));
			}
			//定义允许上传的文件类型
			List<String> fileTypes = new ArrayList<String>();
			fileTypes.add(".jpg");
			fileTypes.add(".jpeg");
			fileTypes.add(".gif");
			fileTypes.add(".png");
			if(!fileTypes.contains(extName.toLowerCase())){
				message = "只允许上传jpg,jpeg,gif,png格式的图片";
				flag = false;
			}
			String root=request.getSession().getServletContext().getRealPath("");
			String savePath = root+File.separator+"pdtpFolder"+File.separator;
			File f1 = new File(savePath);
			if (!f1.exists()) {
				f1.mkdirs();
			}
			if(flag){
				DateFormat df = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ssSSS");
				Calendar calendar = Calendar.getInstance();
				//以当前时间为文件名 格式如：2011-09-03-19-30-36047 
				newName = df.format(calendar.getTime());
				//newName = UUID.randomUUID().toString();
				File newFile = new File(savePath + newName + extName);
				try {
					multFile.transferTo(newFile);
				} catch (IllegalStateException e) {
					e.printStackTrace();
					flag = false;
				} catch (IOException e) {
					e.printStackTrace();
					flag = false;
				}
				//设置图片的相对地址
				wzXxfbPdtp.setTpdz("pdtpFolder/"+newName+extName);
				//图片原名称
				wzXxfbPdtp.setTpmc(fileName);
				//设置ID与新生成的图片名
				wzXxfbPdtp.setPkid(newName);
				wzXxfbPdtpManager.save(wzXxfbPdtp);
			}
		}
//		dwzCallback(model,CREATED_SUCCESS);
		response.setContentType("text/html");
		response.setCharacterEncoding("utf-8");
		PrintWriter out = response.getWriter();
		out.write("<script>parent.callback('"+flag+"','"+message+"')</script>");
//		return LIST_ACTION;
		return null;
	}

3 springmvc-servlet.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:p="http://www.springframework.org/schema/p" 
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans 
        http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
        http://www.springframework.org/schema/context 
        http://www.springframework.org/schema/context/spring-context-2.5.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd"
    default-autowire="byName"   >

	<!-- 开启支持@NumberFormat @DateTimeFormat @Valid标注 ,@DateTimeFormat用于bean 日期属性的格式化,请查看: http://static.springsource.org/spring/docs/3.0.2.RELEASE/spring-framework-reference/htmlsingle/spring-framework-reference.html#mvc-config-->
    <mvc:annotation-driven validator="validator"/>

	<!-- 自动搜索@Controller标注的类 -->
	<context:component-scan base-package="com.**.controller"/>

	<bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping">
		<!-- 拦截器注册 -->
		<property name="interceptors">
			<bean class="javacommon.springmvc.interceptor.SharedRenderVariableInterceptor"/>
		</property>
	</bean>

    <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"/>
	<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver" />

    <!-- 根据客户端的不同的请求决定不同的view进行响应, 如 /blog/1.json /blog/1.xml -->
    <bean class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
    	<property name="ignoreAcceptHeader" value="true"/>
		<property name="defaultContentType" value="text/html"/>

    	<!-- 扩展名至mimeType的映射,即 /user.json => application/json -->
		<property name="mediaTypes">
			<map>
				<entry key="json" value="application/json" />
				<entry key="xml" value="application/xml" />
			</map>
		</property>
		<!-- 用于开启 /userinfo/123?format=json 的支持 -->
		<property name="favorParameter" value="true"/>
		<property name="viewResolvers">
			<list>
				<bean class="org.springframework.web.servlet.view.BeanNameViewResolver" />
			    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
			        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
			        <property name="prefix" value="/pages"/>
			        <property name="suffix" value=".jsp"/>
			    </bean>
			</list>
		</property>
		<property name="defaultViews">
			<list>
				<!-- for application/json -->
				<bean class="org.springframework.web.servlet.view.json.MappingJacksonJsonView" />
				<!-- for application/xml -->
				<!-- 
				<bean class="org.springframework.web.servlet.view.xml.MarshallingView" >
					<property name="marshaller">
						<bean class="org.springframework.oxm.xstream.XStreamMarshaller"/>
					</property>
				</bean>
				 -->
			</list>
		</property>
    </bean>

    <!-- Mapping exception to the handler view -->
    <bean id="exceptionResolver" class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
        <property name="exceptionMappings">
            <props>
            </props>
        </property>
    </bean>

</beans>

[img]http://dl.iteye.com/upload/attachment/559258/a539a5da-fcca-3077-9754-9b67fab5f4cd.jpg[/img]


###############################################################
使用DiskFileItemFactory 及ServletFileUpload 组件进行上传
[color=red]需要注意的是：所有的Form表单数据不再会自动绑定赋值，需要手动去设置值，还有就是不需要在springmvc-servlet.xml里配置：[/color]<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver" />

后台处理类：

@Controller
@RequestMapping("/wzxxfbpdtp")
public class WzXxfbPdtpController extends BaseRestSpringController<WzXxfbPdtp,java.lang.String>{
//默认多列排序,example: username desc,createTime asc
	protected static final String DEFAULT_SORT_COLUMNS = ""; 
	private WzXxfbPdtpManager wzXxfbPdtpManager;
	private final String LIST_ACTION = "redirect:/wzxxfbpdtp/manager";
	/** 
	 * 增加setXXXX()方法,spring就可以通过autowire自动设置对象属性,注意大小写
	 **/
	public void setWzXxfbPdtpManager(WzXxfbPdtpManager manager) {
		this.wzXxfbPdtpManager = manager;
	}
		String extName = "";
		String message = "";
		boolean flag = true;
		Iterator<FileItem> it = fileList.iterator();
		while (it.hasNext()) {
			FileItem item = it.next();
			//给取表单域的值，赋给wzXxfbPdtp对象
			setFormFields(wzXxfbPdtp, item);
			// 如果是文件类型字段
			if (!item.isFormField()) {
				name = item.getName();
				long size = item.getSize();
				if(size>(1024*1024)){
					message="文件"+item.getName()+"大超过了1M，上传失败！";
					json.put("statusCode", "300");
					json.put("message", message);
					flag = false;
					break;
				}
				// 扩展名格式：
				if (name.lastIndexOf(".") >= 0) {
					extName = name.substring(name.lastIndexOf("."));
				}
				// 定义允许上传的文件类型
				List<String> fileTypes = new ArrayList<String>();
				fileTypes.add(".jpg");
				fileTypes.add(".jpeg");
				fileTypes.add(".gif");
				fileTypes.add(".png");
				if(!fileTypes.contains(extName.toLowerCase())){
					message = "只允许上传jpg,jpeg,gif,png格式的图片";
					json.put("statusCode", "300");
					json.put("message", message);
					flag = false;
					break;
				}
				if(flag) {
					DateFormat df2 = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ssSSS");
					Calendar calendar2 = Calendar.getInstance();
					//以当前时间为文件名 格式如：2011-09-03-19-30-36047 
					newName = df2.format(calendar2.getTime());
					File newFile = new File(savePath+"/"+folderName+"/" + newName + extName);
					item.write(newFile);
					//设置图片的相对地址
					wzXxfbPdtp.setTpdz(rootFile.getName()+"/"+folderName+"/"+newName+extName);
					//图片原名称
					wzXxfbPdtp.setTpmc(name);
				} 
			}
		}
		if(flag){
			wzXxfbPdtpManager.save(wzXxfbPdtp);
			json.put("navTabId", "BM01040000");
			json.put("statusCode", "200");
			json.put("callbackType", "closeCurrent");
			json.put("message", CREATED_SUCCESS);
		}
		response.setContentType("text/html");
		response.setCharacterEncoding("utf-8");
		PrintWriter out = response.getWriter();
		out.write(json.toString());
		out.flush();
		out.close();
		return null;
	}
/*
	 * 取得Form表单各文本域的值，赋给wzXxfbPdtp对象
	 */
	private void setFormFields(WzXxfbPdtp wzXxfbPdtp, FileItem item) throws UnsupportedEncodingException {
		if(item.isFormField()){
			String field = item.getFieldName();
			String temp;
			if(field.equals("zzdm")){
				temp = item.getString("utf-8");
				wzXxfbPdtp.setZzdm(temp);
			}
			if(field.equals("zzjc")){
				temp = item.getString("utf-8");
				wzXxfbPdtp.setZzjc(temp);
			}
			if(field.equals("bmdm")){
				temp = item.getString("utf-8");
				wzXxfbPdtp.setBmdm(temp);
			}
			if(field.equals("bmjc")){
				temp = item.getString("utf-8");
				wzXxfbPdtp.setBmjc(temp);
			}
			if(field.equals("tpbt")){
				temp = item.getString("utf-8");
				wzXxfbPdtp.setTpbt(temp);
			}
			if(field.equals("tplj")){
				temp = item.getString("utf-8");
				wzXxfbPdtp.setTplj(temp);
			}
			if(field.equals("kd")){
				temp = item.getString("utf-8");
				wzXxfbPdtp.setKd(Integer.parseInt(temp));
			}
			if(field.equals("gd")){
				temp = item.getString("utf-8");
				wzXxfbPdtp.setGd(Integer.parseInt(temp));
			}
			if(field.equals("sfpd")){
				temp = item.getString("utf-8");
				wzXxfbPdtp.setSfpd(temp);
			}
		}
	}

//删除本地图片文件
	private void deleteLocalFile(HttpServletRequest request, WzXxfbPdtp pdtp) {
		String	path = pdtp.getTpdz();
		String	root = request.getSession().getServletContext().getRealPath("");
		File rootFile =  new File(root);
		//得到图片存放的完整路径

		String savePath = rootFile.getParent()+ConstantUtils.getFilePath()+"/"+path;
		File f1 = new File(savePath);
		if(f1.exists()){
			f1.delete();
		}
	}

页面显示跟上图一样