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SpringMVC杂记(一) 文件上传

springmvcfileupload 
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SpringMVC杂记(一) 文件上传

1) 添加multipartResolver的配置 
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
	<property name="maxUploadSize" value="100000" />
	<property name="defaultEncoding" value="UTF-8" />
</bean>


2) 由于multipartResolver采用的是CommonsMultipartResolver的实现毫无疑问 Jakarta commons fileupload组件是必须添加到
CLASSPATH下的。 另外Spring也使用了 Jakarta commons io组件。
pom.xml 
<dependency>
	<groupId>commons-io</groupId>
	<artifactId>commons-io</artifactId>
	<version>2.1</version>
</dependency>
<dependency>
	<groupId>commons-fileupload</groupId>
	<artifactId>commons-fileupload</artifactId>
	<version>1.2.2</version>
</dependency>


3) JSP 
<%@ page language="java" %>
<%@ page contentType="text/html; charset=UTF-8" %>
<%@ page import="java.util.*" %>
<%@ page isELIgnored="false" %>

<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<html>
	<head>
		<base href="<%=basePath%>" />
		<title>上传测试</title>
	</head>

	<body>
		<form action="test/upload" method="post" enctype="multipart/form-data">
			<table>
				<tr>
					<td>文件名</td>
					<td> <input type="text" name="fileName"> </td>
				</tr>
				<tr>
					<td>文件</td>
					<td> <input type="file" name="file"> </td>
				</tr>
				<tr>
					<td colspan="2"><input type="submit" value="上传"></td>
				</tr>
			</table>
		</form>
	</body>
</html>


4) RequestMapping 方法 
@Controller
@RequestMapping(value = "/test")
public class TestController {

	private static final File USER_FILES_DIRECTORY = new File("D:/TEST_UPLOAD/");

	@ResponseBody
	@RequestMapping(value = "/upload", method = {RequestMethod.POST})
	public String test(
			@RequestParam("fileName") String fileName,
			@RequestParam("file") CommonsMultipartFile file) throws Exception {

		file.getFileItem().write(new File(USER_FILES_DIRECTORY, fileName));

		return "OK";
	}
}


5) 上传文件过大怎么办？ 如何抓到org.springframework.web.multipart.MaxUploadSizeExceededException ? 
@Controller
@RequestMapping(value = "/test")
public class TestController{

	// ...

	@ExceptionHandler(MaxUploadSizeExceededException.class)
	public ModelAndView handleMaxUploadSizeExceededException(Exception ex, WebRequest request) {
		// TODO: 在这里处理MaxUploadSizeExceededException
		return null;
	}
}

其实这样做是不行的。 因为，test()方法还没有被执行的时候，在数据绑定阶段MaxUploadSizeExceededException的一个实例已经被抛出。
SpringMVC框架，直接在exceptionResolver的配置中去找对应的逻辑视图名。

应该把这个Controller实现为一个org.springframework.web.servlet.HandlerExceptionResolver。 
@Controller
@RequestMapping(value = "/test")
public class TestController implements HandlerExceptionResolver {

	private static final File USER_FILES_DIRECTORY = new File("D:/TEST_UPLOAD/");

	@ResponseBody
	@RequestMapping(value = "/upload", method = {RequestMethod.POST})
	public String test(
			@RequestParam("fileName") String fileName,
			@RequestParam("file") CommonsMultipartFile file) throws Exception {

		file.getFileItem().write(new File(USER_FILES_DIRECTORY, fileName));

		return "OK";
	}

	public ModelAndView resolveException(HttpServletRequest request,
			HttpServletResponse response, Object handler, Exception ex) {

		if (ex instanceof MaxUploadSizeExceededException) {
			System.out.println("上传过大错误已经处理");
			return new ModelAndView("redirect:http://www.iteye.com");
		}

		return null;	// 其他错误交由exceptionResolver处理
	}
}
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评论
1 楼 qq545485196 2012-10-08  
美女最好还写个spring-mvc入门的.
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