spring文件上传_springmvc怎么上传文件

1. Springmvc的几种多附件上传方式

1.单文件上传

1.1、页面

文件上传需要将表单的提交方法设置为post，将enctype的值设置为”multipart/form-data”。

<form action="${pageContext.request.contextPath}/test/upload.do" method="post" enctype="multipart/form-data">
<input type="file" name="img"><br />
<input type="submit" name="提交">
</form>
1.2 控制器
@Controller
@RequestMapping("/test")
public class MyController {

@RequestMapping(value = "/upload.do", method = RequestMethod.POST)
// 这里的MultipartFile对象变量名跟表单中的file类型的input标签的name相同，
//所以框架会自动用MultipartFile对象来接收上传过来的文件，
//当然也可以使用@RequestParam("img")指定其对应的参数名称
public String upload(MultipartFile img, HttpSession session)
throws Exception {
// 如果没有文件上传，MultipartFile也不会为null，可以通过调用getSize()方法获取文件的大小来判断是否有上传文件
if (img.getSize() > 0) {
// 得到项目在服务器的真实根路径，如：/home/tomcat/webapp/项目名/images
String path = session.getServletContext().getRealPath("images");
// 得到文件的原始名称，如：美女.png
String fileName = img.getOriginalFilename();
// 通过文件的原始名称，可以对上传文件类型做限制，如：只能上传jpg和png的图片文件
if (fileName.endsWith("jpg") || fileName.endsWith("png")) {
File file = new File(path, fileName);
img.transferTo(file);
return "/success.jsp";
}
}
return "/error.jsp";
}
}
1.3springmvc.xml配置

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

<property name="defaultEncoding" value="utf-8"/>

<property name="maxUploadSize" value="1048576"/>

<property name="maxUploadSizePerFile" value="1048576"/>
</bean>
2.多文件上传

2.1页面
<form action="${pageContext.request.contextPath}/test/upload.do" method="post" enctype="multipart/form-data">
file 1 : <input type="file" name="imgs"><br />
file 2 : <input type="file" name="imgs"><br />
file 3 : <input type="file" name="imgs"><br />
<input type="submit" name="提交">
</form>
2.2控制器
@Controller
@RequestMapping("/test")
public class MyController {

@RequestMapping(value = "/upload.do", method = RequestMethod.POST)
// 这里的MultipartFile[] imgs表示前端页面上传过来的多个文件，imgs对应页面中多个file类型的input标签的name，
// 但框架只会将一个文件封装进一个MultipartFile对象，
// 并不会将多个文件封装进一个MultipartFile[]数组，直接使用会报[Lorg.springframework.web.multipart.MultipartFile;.<init>()错误，
// 所以需要用@RequestParam校正参数（参数名与MultipartFile对象名一致），当然也可以这么写：@RequestParam("imgs") MultipartFile[] files。
public String upload(@RequestParam MultipartFile[] imgs, HttpSession session)
throws Exception {
for (MultipartFile img : imgs) {
if (img.getSize() > 0) {
String path = session.getServletContext().getRealPath("images");
String fileName = img.getOriginalFilename();
if (fileName.endsWith("jpg") || fileName.endsWith("png")) {
File file = new File(path, fileName);
img.transferTo(file);
}
}
}
return "/success.jsp";
}
}
2.3springmvc.xml配置

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

<property name="defaultEncoding" value="utf-8"/>

<property name="maxUploadSize" value="1048576"/>

<property name="maxUploadSizePerFile" value="1048576"/>
</bean>

扩展：
/*
* 通过流的方式上传文件
* @RequestParam("file") 将name=file控件得到的文件封装成CommonsMultipartFile 对象
*/

/*
* 采用file.Transto 来保存上传的文件
*/

/*
*采用spring提供的上传文件的方法
*/

2. springmvc怎么实现多文件上传

多文件上传其实很简单，和上传其他相同的参数如checkbox一样，表单中使用相同的名称，然后action中将MultipartFile参数类定义为数组就可以。
接下来实现：
1、创建一个上传多文件的表单：
在CODE上查看代码片派生到我的代码片
<body>
<h2>上传多个文件实例</h2>
<form action="filesUpload.html" method="post"
enctype="multipart/form-data">
<p>
选择文件:<input type="file" name="files">
<p>
选择文件:<input type="file" name="files">
<p>
选择文件:<input type="file" name="files">
<p>
<input type="submit" value="提交">
</form>
</body>
2、编写处理表单的action，将原来保存文件的方法单独写一个方法出来方便共用：
[java] view plain
print?在CODE上查看代码片派生到我的代码片
/***
* 保存文件
* @param file
* @return
*/
private boolean saveFile(MultipartFile file) {
// 判断文件是否为空
if (!file.isEmpty()) {
try {
// 文件保存路径
String filePath = request.getSession().getServletContext().getRealPath("/") + "upload/"
+ file.getOriginalFilename();
// 转存文件
file.transferTo(new File(filePath));
return true;
} catch (Exception e) {
e.printStackTrace();
}
}
return false;
}
3、编写action:
@RequestMapping("filesUpload")
public String filesUpload(@RequestParam("files") MultipartFile[] files) {
//判断file数组不能为空并且长度大于0
if(files!=null&&files.length>0){
//循环获取file数组中得文件
for(int i = 0;i<files.length;i++){
MultipartFile file = files[i];
//保存文件
saveFile(file);
}
}
// 重定向
return "redirect:/list.html";
}

3. 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
[html] view plain
<?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>

<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>

<servlet-mapping>
<servlet-name>dispatcherServlet</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>

<welcome-file-list>
<welcome-file>index.do</welcome-file>
</welcome-file-list>
</web-app>

applicationContext.xml
[html] view plain
<?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">


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


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


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


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

</beans>

codeifAction.xml
[html] view plain
<?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
[java] view plain
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
[html] view plain
<%@ 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
[html] view plain
<%@ 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>

4. spring mvc 怎么实现上传文件

在springmvc配置文件中这样配置:

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

<property name="defaultEncoding" value="utf-8"/>

<property name="maxUploadSize" value="-1"/>

<property name="resolveLazily" value="true"/>
</bean>
页面：
<form action="upload.action" method="post" enctype="multipart/form-data">
<input type="file" name="fileUpload" />
<input type="submit" value="上传" />
</form>

后台：
@Controller
public class UploadAction implements ServletContextAware {
private ServletContext context;
@RequestMapping("/upload")
public String upload(HttpServletRequest request) throws Exception{
//转换请求为文件上传请求
MultipartHttpServletRequest mrequest=(MultipartHttpServletRequest)request;
MultipartFile mfile=mrequest.getFile("file");
if(!mfile.isEmpty()){//判断文件是否为空
path=context.getRealPath("/upload")+File.separator+mfile.getOriginalFilename();
File file=new File(path);
mfile.transferTo(file);//保存文件
}
return "跳转页面";
}}

5. spring mvc 实现多个文件上传 List<MultipartFile> files = request.getFiles("file"); 报错

CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(request.getSession().getServletContext());
//判断request是否有文件需要上传
if (multipartResolver.isMultipart(request)) {
//转换成多部分request
MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest) request;
//读取文件
List<MultipartFile> file = multiRequest.getFiles("file");

6. 如何使用springmvc实现文件上传

在现在web应用的开发，springMvc使用频率是比较广泛的，现在给大家总结一下springMvc的上传附件的应用，希望对大家有帮助,废话不多说，看效果

准备jar包

4.准备上传代码

@Controller//spring使用注解管理bean
@RequestMapping("/upload")//向外暴露资源路径,访问到该类
public class UploadController {
/**
* 上传功能
* @return
* @throws IOException
*/
@RequestMapping("/uploadFile")//向外暴露资源路径，访问到该方法
public String uploadFile(MultipartFile imgFile,HttpServletRequest req) throws IOException{
if(imgFile != null ){
//获取文件输入流
InputStream inputStream = imgFile.getInputStream();
//随机产生文件名，原因是：避免上传的附件覆盖之前的附件
String randName = UUID.randomUUID().toString();//随机文件名
//获取文件原名
String originalFilename = imgFile.getOriginalFilename();
//获取文件后缀名(如：jpgpng...)
String extension = FilenameUtils.getExtension(originalFilename);
//新名字
String newName = randName+"."+extension;
//获取servletContext
ServletContext servletContext = req.getSession().getServletContext();
//获取根路径
String rootPath = servletContext.getRealPath("/");

File file = new File(rootPath,"upload");
//判断文件是否存在，若不存在，则创建它
if(!file.exists()){
file.mkdirs();
}
//获取最终输出的位置
FileOutputStream fileOutputStream = new FileOutputStream(new File(file,newName));
//上传附件
IOUtils.(inputStream, fileOutputStream);
}
return null;
}
}

7. spring mvc上传文件到指定的文件夹中，新手不会，

第一个参数是你的前台传递进来的文件。

第二个参数是request对象。
第三个参数是spring mvc 绑定数据用的对象。
根据你的代码你的第三个参数可以不要。

第一个参数是前台form当中有个类似于<input type="file" name="file"/>的控件传递过来的文件。

8. springmvc怎么实现文件上传

springmvc怎么实现文件上传

package com.test.controller;

import java.io.File;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.apache.commons.io.FilenameUtils;
import org.apache.commons.lang3.ArrayUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
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.bind.annotation.ResponseBody;
import org.springframework.web.multipart.commons.CommonsMultipartFile;

import com.test.servlet.NoSupportExtensionException;
import com.test.servlet.State;

@Controller
@RequestMapping(value = "/mvc")
public class UploadController {

/** 日志对象*/
private Log logger = LogFactory.getLog(this.getClass());

private static final long serialVersionUID = 1L;

/** 上传目录名*/
private static final String uploadFolderName = "uploadFiles";

/** 允许上传的扩展名*/
private static final String [] extensionPermit = {"txt", "xls", "zip"};

@RequestMapping(value = "/upload.do", method = RequestMethod.POST)
public @ResponseBody Map<String, Object> fileUpload(@RequestParam("file") CommonsMultipartFile file,
HttpSession session, HttpServletRequest request, HttpServletResponse response) throws Exception{
logger.info("UploadController#fileUpload() start");

//清除上次上传进度信息
String curProjectPath = session.getServletContext().getRealPath("/");
String saveDirectoryPath = curProjectPath + "/" + uploadFolderName;
File saveDirectory = new File(saveDirectoryPath);
logger.debug("Project real path [" + saveDirectory.getAbsolutePath() + "]");

// 判断文件是否存在
if (!file.isEmpty()) {
String fileName = file.getOriginalFilename();
String fileExtension = FilenameUtils.getExtension(fileName);
if(!ArrayUtils.contains(extensionPermit, fileExtension)) {
throw new NoSupportExtensionException("No Support extension.");
}
file.transferTo(new File(saveDirectory, fileName));
}

logger.info("UploadController#fileUpload() end");
return State.OK.toMap();
}

}

9. 请教spring mvc 的文件上传

springmvc文件上传
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 
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>

10. 上传文件时，SpringMVC如何接收表单数据

用MultipartFile接收表单上传文件数据

案例：全过程
jsp

<form action="${pageContext.request.contextPath }/upload" method="post" enctype="multipart/form-data">
<h2>文件上传</h2>
文件:<input type="file" name="uploadFile"/><br/><br/>
<input type="submit" value="上传"/>
</form>

SpringMVC Controller
@RequestMapping(value = "/upload",method = RequestMethod.POST)
public String upload(@RequestParam(value = "file", required = false) MultipartFile uploadFile, 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 "uploadResult";
}

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