springmvc怎么上传文件

spring mvc(注解)上传文件的简单例子,这有几个需要注意的地方

1.form的enctype=”multipart/form-data” 这个是上传文件必搜磨须的

2.applicationContext.xml中 <bean id=”multipartResolver” class=”org.springframework.web.multipart.commons.CommonsMultipartResolver”/>关于文件上传的配置不能少

大家可以看具体代码如下:

web.xml

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<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">

<display-name>webtest</display-name>

<凳则listener>

<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>

</listener>

<context-param>

<param-name>contextConfigLocation</param-name>

<param-value>

/WEB-INF/config/applicationContext.xml

/WEB-INF/config/codeifAction.xml

</param-value>

</context-param>

<servlet>

<servlet-name>dispatcherServlet</servlet-name>

<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

<init-param>

<param-name>contextConfigLocation</param-name>

<param-value>/WEB-INF/config/codeifAction.xml</param-value>

</init-param>

<load-on-startup>1</load-on-startup>

</servlet>

<!-- 拦截所有以do结尾的请求 -->

<servlet-mapping>

<servlet-name>dispatcherServlet</servlet-name>

<url-pattern>*.do</url-pattern>

</servlet-mapping>枣漏棚

<welcome-file-list>

<welcome-file>index.do</welcome-file>

</welcome-file-list>

</web-app>

applicationContext.xml

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<?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-3.0.xsd

http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd"

default-lazy-init="true">

<!-- 启动Spring MVC的注解功能，完成请求和注解POJO的映射 -->

<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" lazy-init="false" />

<!-- 另外最好还要加入DefaultAnnotationHandlerMapping，不然会被 XML或其它的映射覆盖！ -->

<bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" />

<!-- 对模型视图名称的解析，即在模型视图名称添加前后缀 -->

<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" p:prefix="/WEB-INF/jsp/" p:suffix=".jsp" />

<!-- 支持上传文件 -->

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

</beans>

codeifAction.xml

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<?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:context="http://www.springframework.org/schema/context"

xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd

http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd"

default-lazy-init="true">

<bean id="uploadAction" class="com.codeif.action.UploadAction" />

</beans>

UploadAction.java

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package com.codeif.action

import java.io.File

import java.util.Date

import javax.servlet.http.HttpServletRequest

import org.springframework.stereotype.Controller

import org.springframework.ui.ModelMap

import org.springframework.web.bind.annotation.RequestMapping

import org.springframework.web.bind.annotation.RequestParam

import org.springframework.web.multipart.MultipartFile

@Controller

public class UploadAction {

@RequestMapping(value = "/upload.do")

public String upload(@RequestParam(value = "file", required = false) MultipartFile file, HttpServletRequest request, ModelMap model) {

System.out.println("开始")

String path = request.getSession().getServletContext().getRealPath("upload")

String fileName = file.getOriginalFilename()

//String fileName = new Date().getTime()+".jpg"

System.out.println(path)

File targetFile = new File(path, fileName)

if(!targetFile.exists()){

targetFile.mkdirs()

}

//保存

try {

file.transferTo(targetFile)

} catch (Exception e) {

e.printStackTrace()

}

model.addAttribute("fileUrl", request.getContextPath()+"/upload/"+fileName)

return "result"

}

}

index.jsp

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<%@ page pageEncoding="utf-8"%>

<!DOCTYPE html>

<html>

<head>

<meta charset="utf-8">

<title>上传图片</title>

</head>

<body>

<form action="upload.do" method="post" enctype="multipart/form-data">

<input type="file" name="file" /><input type="submit" value="Submit" /></form>

</body>

</html>

WEB-INF/jsp/下的result.jsp

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<%@ page pageEncoding="utf-8"%>

<!DOCTYPE html>

<html>

<head>

<meta charset="utf-8">

<title>上传结果</title>

</head>

<body>

<img alt="" src="${fileUrl }" />

</body>

</html>

springmvc文核枯或件上传

1.加入jar包：

commons-fileupload-1.2.2.jar

commons-io-2.0.1.jar

lperson.java中加属性，实现get ,set方法

private String photoPath

2.创建WebRoot/upload目录，存放上传的文败敬件

1 <sf:form id="p" action="saveOrUpdate"

2 method="post"

3 modelAttribute="person"

4 enctype="multipart/form-data">

5

6 <sf:hidden path="id"/>

7 name: <sf:input path="name"/><br>

8 age: <sf:input path="age"/><br>

9 photo: <input type="file" name="photo"/><br>

上面第9行文件上传框，不能和实体对象属性同名，类型不同

controller配置

1 12、文件上传改伍功能实现 配置文件上传解析器

2 @RequestMapping(value={"/saveOrUpdate"},method=RequestMethod.POST)

3 public String saveOrUpdate(Person p,

4 @RequestParam("photo") MultipartFile file,

5 HttpServletRequest request

6 ) throws IOException{

7 if(!file.isEmpty()){

8 ServletContext sc = request.getSession().getServletContext()

9 String dir = sc.getRealPath(“/upload”) //设定文件保存的目录

10

11 String filename = file.getOriginalFilename() //得到上传时的文件名

12 FileUtils.writeByteArrayToFile(new File(dir,filename), file.getBytes())

13

14 p.setPhotoPath(“/upload/”+filename) //设置图片所在路径

15

16 System.out.println("upload over. "+ filename)

17 }

18 ps.saveOrUpdate(p)

19 return "redirect:/person/list.action" //重定向

20 }

3.文件上传功能实现 spring-mvc.xml 配置文件上传解析器

1 <!-- 文件上传解析器 id 必须为multipartResolver -->

2 <bean id="multipartResolver"

3 class="org.springframework.web.multipart.commons.CommonsMultipartResolver">

4 <property name="maxUploadSize" value=“10485760"/>

5 </bean>

6

7 maxUploadSize以字节为单位：10485760 =10M id名称必须这样写

1 映射资源目录

2 <mvc:resources location="/upload/" mapping="/upload/**"/>

随即文件名常用的三种方式：

文件上传功能（增强：防止文件重名覆盖）

fileName = UUID.randomUUID().toString() + extName

fileName = System.nanoTime() + extName

fileName = System.currentTimeMillis() + extName

1 if(!file.isEmpty()){

2 ServletContext sc = request.getSession().getServletContext()

3 String dir = sc.getRealPath("/upload")

4 String filename = file.getOriginalFilename()

5

6

7 long _lTime = System.nanoTime()

8 String _ext = filename.substring(filename.lastIndexOf("."))

9 filename = _lTime + _ext

10

11 FileUtils.writeByteArrayToFile(new File(dir,filename), file.getBytes())

12

13 p.setPhotoPath("/upload/"+filename)

14

15 System.out.println("upload over. "+ filename)

16 }

图片显示 personList.jsp

1 <td><img src="${pageContext.request.contextPath}${p.photoPath}">${p.photoPath}</td>

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