SpringMVC上传文件例子

服务器：
Apache Tomcat/8.0.33

开发环境：Eclipse Java EE IDE for Web Developers.

Version: Mars.2 Release (4.5.2)

Build id: 20160218-0600

java version "1.8.0_65"

SpringMVC：4.2.6

新建一个Dynamic Web Project

新建web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <!-- 配置Servlet name 和class-->
<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class> org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<!-- 配置servlet mapping -->
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>*.html</url-pattern>
</servlet-mapping>
<!-- 配置filter name和class  -->
<filter>
<filter-name>CharacterEncodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>utf-8</param-value>
</init-param>
</filter>
<!-- 配置filter mapping -->
<filter-mapping>
<filter-name>CharacterEncodingFilter</filter-name>
<url-pattern>*.html</url-pattern>
</filter-mapping>
</web-app>

新建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"
xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
<!-- jsp 渲染器 -->
<bean id="jspViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
<property name="prefix" value="/WEB-INF/jsp/"/>
<property name="suffix" value=".jsp"/>
</bean>
<!-- 对上传的支持
需要commons-fileupload.jar和commons-io.jar的支持
设置(multipart渲染器)  multipart就是file upload
-->
<bean id="multipartResolver"
class="org.springframework.web.multipart.commons.CommonsMultipartResolver">

<!-- one of the properties available; the maximum file size in bytes  -->
<!-- 10mb -->
<property name="maxUploadSize" value="1000000"/>

</bean>
<!-- 注解扫描 -->
<context:component-scan base-package="cn.han.controller"/>

<!-- ... -->

</beans>

新建cn.han.controller包

新建HelloWorldController.java

package cn.han.controller;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.text.Normalizer.Form;

import javax.servlet.http.HttpServletRequest;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.commons.CommonsMultipartFile;
import org.springframework.web.servlet.ModelAndView;

@Controller
public class HelloWorldController {
//|表单页面
@RequestMapping("/form")
public ModelAndView form()
{
ModelAndView mView=new ModelAndView();
mView.setViewName("form");
return mView;
}
//|上传处理页面
@RequestMapping(path="/upload",method = RequestMethod.POST)
public ModelAndView upload(@RequestParam("file")CommonsMultipartFile upfile,HttpServletRequest req) throws IOException{
//|获取在Web服务器上的 绝对路径
String path =req.getRealPath("/fileupload");
System.out.println(path);
//|获取输入流
InputStream is=upfile.getInputStream();
//|文件输出流
OutputStream os =new FileOutputStream(new File(path,upfile.getOriginalFilename()));
//|循环写入
int length=0;
byte [] buffer=new byte[128];
while((length=is.read(buffer))!=-1)
{
os.write(buffer,0, length);
}
is.close();
os.close();
//===渲染===
ModelAndView mView=new ModelAndView();
mView.setViewName("upload");
//|返回至渲染器
return mView;
}
}

新建form.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>上传文件</title>
</head>
<body>
<form action="upload.html" method="POST" enctype="multipart/form-data">
<input type="file" name="file"/>
<input type="submit" value="上传" />
</form>
</body>
</html>

upload.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>上传结果</title>
</head>
<body>
恭喜~上传成功~
</body>
</html>

还需要导入jar包，包括Springmvc的所有包

commons-io.jar,commons-fileupload.jar

commons-logging-1.2.jar

jastl-1.1.2.jar,standard-1.1.2.jar

下面是我遇到的报错以及解决办法

HTTP Status 500 - Failed to convert value of type [java.lang.String] to required type [org.springframework.web.multipart.commons.CommonsMultipartFile]; nested exception is java.lang.IllegalStateException: Cannot convert value of type [java.lang.String] to required type [org.springframework.web.multipart.commons.CommonsMultipartFile]: no matching editors or conversion strategy found

type Exception report

message Failed to convert value of type [java.lang.String] to required type [org.springframework.web.multipart.commons.CommonsMultipartFile]; nested exception is java.lang.IllegalStateException: Cannot convert value of type [java.lang.String] to required type [org.springframework.web.multipart.commons.CommonsMultipartFile]: no matching editors or conversion strategy found

description The server encountered an internal error that prevented it from fulfilling this request.

exception
org.springframework.beans.ConversionNotSupportedException: Failed to convert value of type [java.lang.String] to required type [org.springframework.web.multipart.commons.CommonsMultipartFile]; nested exception is java.lang.IllegalStateException: Cannot convert value of type [java.lang.String] to required type [org.springframework.web.multipart.commons.CommonsMultipartFile]: no matching editors or conversion strategy found
org.springframework.beans.TypeConverterSupport.doConvert(TypeConverterSupport.java:74)
org.springframework.beans.TypeConverterSupport.convertIfNecessary(TypeConverterSupport.java:47)
org.springframework.validation.DataBinder.convertIfNecessary(DataBinder.java:688)
org.springframework.web.bind.annotation.support.HandlerMethodInvoker.resolveRequestParam(HandlerMethodInvoker.java:520)
org.springframework.web.bind.annotation.support.HandlerMethodInvoker.resolveHandlerArguments(HandlerMethodInvoker.java:353)
org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:173)
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:444)
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:432)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:961)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:895)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:967)
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:869)
javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:843)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:121)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

root cause
java.lang.IllegalStateException: Cannot convert value of type [java.lang.String] to required type [org.springframework.web.multipart.commons.CommonsMultipartFile]: no matching editors or conversion strategy found
org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:302)
org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:108)
org.springframework.beans.TypeConverterSupport.doConvert(TypeConverterSupport.java:64)
org.springframework.beans.TypeConverterSupport.convertIfNecessary(TypeConverterSupport.java:47)
org.springframework.validation.DataBinder.convertIfNecessary(DataBinder.java:688)
org.springframework.web.bind.annotation.support.HandlerMethodInvoker.resolveRequestParam(HandlerMethodInvoker.java:520)
org.springframework.web.bind.annotation.support.HandlerMethodInvoker.resolveHandlerArguments(HandlerMethodInvoker.java:353)
org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:173)
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:444)
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:432)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:961)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:895)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:967)
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:869)
javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:843)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:121)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

note The full stack trace of the root cause is available in the Apache Tomcat/8.0.33 logs.

上面报错说的是 无法从String转化成CommonsMultipartFile ，其实就是 我的form表单有问题，把文件名发过去了 而没有真正传送二进制文件，需要设置

enctype="multipart/form-data"

下面是第二个报错：

HTTP Status 500 - Request processing failed; nested exception is org.springframework.web.multipart.MaxUploadSizeExceededException: Maximum upload size of 100000 bytes exceeded; nested exception is org.apache.commons.fileupload.FileUploadBase$SizeLimitExceededException: the request was rejected because its size (164406) exceeds the configured maximum (100000)

type Exception report

message Request processing failed; nested exception is org.springframework.web.multipart.MaxUploadSizeExceededException: Maximum upload size of 100000 bytes exceeded; nested exception is org.apache.commons.fileupload.FileUploadBase$SizeLimitExceededException: the request was rejected because its size (164406) exceeds the configured maximum (100000)

description The server encountered an internal error that prevented it from fulfilling this request.

exception
org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.springframework.web.multipart.MaxUploadSizeExceededException: Maximum upload size of 100000 bytes exceeded; nested exception is org.apache.commons.fileupload.FileUploadBase$SizeLimitExceededException: the request was rejected because its size (164406) exceeds the configured maximum (100000)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:979)
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:869)
javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:843)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:121)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

root cause
org.springframework.web.multipart.MaxUploadSizeExceededException: Maximum upload size of 100000 bytes exceeded; nested exception is org.apache.commons.fileupload.FileUploadBase$SizeLimitExceededException: the request was rejected because its size (164406) exceeds the configured maximum (100000)
org.springframework.web.multipart.commons.CommonsMultipartResolver.parseRequest(CommonsMultipartResolver.java:162)
org.springframework.web.multipart.commons.CommonsMultipartResolver.resolveMultipart(CommonsMultipartResolver.java:142)
org.springframework.web.servlet.DispatcherServlet.checkMultipart(DispatcherServlet.java:1091)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:930)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:895)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:967)
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:869)
javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:843)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:121)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

root cause
org.apache.commons.fileupload.FileUploadBase$SizeLimitExceededException: the request was rejected because its size (164406) exceeds the configured maximum (100000)
org.apache.commons.fileupload.FileUploadBase$FileItemIteratorImpl.<init>(FileUploadBase.java:965)
org.apache.commons.fileupload.FileUploadBase.getItemIterator(FileUploadBase.java:310)
org.apache.commons.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:334)
org.apache.commons.fileupload.servlet.ServletFileUpload.parseRequest(ServletFileUpload.java:115)
org.springframework.web.multipart.commons.CommonsMultipartResolver.parseRequest(CommonsMultipartResolver.java:158)
org.springframework.web.multipart.commons.CommonsMultipartResolver.resolveMultipart(CommonsMultipartResolver.java:142)
org.springframework.web.servlet.DispatcherServlet.checkMultipart(DispatcherServlet.java:1091)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:930)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:895)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:967)
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:869)
javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:843)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:121)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

note The full stack trace of the root cause is available in the Apache Tomcat/8.0.33 logs.

这里一看就知道是配置CommonsMultipart渲染器的上传文件大小限制的原因

<property name="maxUploadSize" value="1000000"/>

下面还有一组报错

HTTP Status 500 - D:\eclipse-jee-workplace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\01upload_test\fileupload\psbe.jpg (系统找不到指定的路径。)

type Exception report

message D:\eclipse-jee-workplace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\01upload_test\fileupload\psbe.jpg (系统找不到指定的路径。)

description The server encountered an internal error that prevented it from fulfilling this request.

exception
java.io.FileNotFoundException: D:\eclipse-jee-workplace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\01upload_test\fileupload\psbe.jpg (系统找不到指定的路径。)
java.io.FileOutputStream.open0(Native Method)
java.io.FileOutputStream.open(FileOutputStream.java:270)
java.io.FileOutputStream.<init>(FileOutputStream.java:213)
java.io.FileOutputStream.<init>(FileOutputStream.java:162)
cn.han.controller.HelloWorldController.upload(HelloWorldController.java:38)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:497)
org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:178)
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:444)
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:432)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:961)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:895)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:967)
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:869)
javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:843)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:121)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

note The full stack trace of the root cause is available in the Apache Tomcat/8.0.33 logs.

Apache Tomcat/8.0.33

这个意思就是文件夹不存在 ，确实不存在，需要在D:\eclipse-jee-workplace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\01upload_test目录下创建fileupload文件夹，因为eclipse默认部署的地方就是在D:\eclipse-jee-workplace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\下面，然而我们指定了目录
，却没有那个目录就报错了。

项目运行截图