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SpringMVC上傳檔案例子

伺服器:

Apache Tomcat/8.0.33

開發環境: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

新建一個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>
<!-- 對上傳的支援
   需要commons-fileupload.jar和commons-io.jar的支援
   設定(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>
<!-- 註解掃描 -->
    <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 {
	//|表單頁面
	@RequestMapping("/form")
	public ModelAndView form()
	{
		ModelAndView mView=new ModelAndView();
		mView.setViewName("form");
		return mView;
	}
	//|上傳處理頁面
	@RequestMapping(path="/upload",method = RequestMethod.POST)
	public ModelAndView upload(@RequestParam("file")CommonsMultipartFile upfile,HttpServletRequest req) throws IOException{
		//|獲取在Web伺服器上的 絕對路徑
		String path =req.getRealPath("/fileupload");
		System.out.println(path);
		//|獲取輸入流
		InputStream is=upfile.getInputStream();
		//|檔案輸出流
		OutputStream os =new FileOutputStream(new File(path,upfile.getOriginalFilename()));
		//|迴圈寫入
		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>上傳檔案</title>
</head>
<body>
  <form action="upload.html" method="POST" enctype="multipart/form-data">
    <input type="file" name="file"/>
    <input type="submit" value="上傳" />
  </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>上傳結果</title>
</head>
<body>
  恭喜~上傳成功~
</body>
</html>
還需要匯入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

下面是我遇到的報錯以及解決辦法

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.

上面報錯說的是 無法從String轉化成CommonsMultipartFile ,其實就是 我的form表單有問題,把檔名發過去了 而沒有真正傳送二進位制檔案,需要設定
enctype="multipart/form-data"
下面是第二個報錯:
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.
這裡一看就知道是配置CommonsMultipart渲染器的上傳檔案大小限制的原因
    <property name="maxUploadSize" value="1000000"/>

下面還有一組報錯
HTTP Status 500 - D:\eclipse-jee-workplace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\01upload_test\fileupload\psbe.jpg (系統找不到指定的路徑。)


type Exception report

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

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 (系統找不到指定的路徑。)
	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
這個意思就是資料夾不存在 ,確實不存在,需要在D:\eclipse-jee-workplace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\01upload_test目錄下建立fileupload資料夾,因為eclipse預設部署的地方就是在D:\eclipse-jee-workplace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\下面,然而我們指定了目錄 ,卻沒有那個目錄就報錯了。

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