spring文件上傳

發布時間: 2022-01-16 02:24:55

A. 如何使用springmvc實現文件上傳

在現在web應用的開發，springMvc使用頻率是比較廣泛的，現在給大家總結一下springMvc的上傳附件的應用，希望對大家有幫助,廢話不多說，看效果

准備jar包

4.准備上傳代碼

@Controller//spring使用註解管理bean
@RequestMapping("/upload")//向外暴露資源路徑,訪問到該類
public class UploadController {
/**
* 上傳功能
* @return
* @throws IOException
*/
@RequestMapping("/uploadFile")//向外暴露資源路徑，訪問到該方法
public String uploadFile(MultipartFile imgFile,HttpServletRequest req) throws IOException{
if(imgFile != null ){
//獲取文件輸入流
InputStream inputStream = imgFile.getInputStream();
//隨機產生文件名，原因是：避免上傳的附件覆蓋之前的附件
String randName = UUID.randomUUID().toString();//隨機文件名
//獲取文件原名
String originalFilename = imgFile.getOriginalFilename();
//獲取文件後綴名(如：jpgpng...)
String extension = FilenameUtils.getExtension(originalFilename);
//新名字
String newName = randName+"."+extension;
//獲取servletContext
ServletContext servletContext = req.getSession().getServletContext();
//獲取根路徑
String rootPath = servletContext.getRealPath("/");

File file = new File(rootPath,"upload");
//判斷文件是否存在，若不存在，則創建它
if(!file.exists()){
file.mkdirs();
}
//獲取最終輸出的位置
FileOutputStream fileOutputStream = new FileOutputStream(new File(file,newName));
//上傳附件
IOUtils.(inputStream, fileOutputStream);
}
return null;
}
}

B. springmvc怎麼實現多文件上傳

多文件上傳其實很簡單，和上傳其他相同的參數如checkbox一樣，表單中使用相同的名稱，然後action中將MultipartFile參數類定義為數組就可以。
接下來實現：
1、創建一個上傳多文件的表單：
在CODE上查看代碼片派生到我的代碼片
<body>
<h2>上傳多個文件實例</h2>
<form action="filesUpload.html" method="post"
enctype="multipart/form-data">
<p>
選擇文件:<input type="file" name="files">
<p>
選擇文件:<input type="file" name="files">
<p>
選擇文件:<input type="file" name="files">
<p>
<input type="submit" value="提交">
</form>
</body>
2、編寫處理表單的action，將原來保存文件的方法單獨寫一個方法出來方便共用：
[java] view plain
print?在CODE上查看代碼片派生到我的代碼片
/***
* 保存文件
* @param file
* @return
*/
private boolean saveFile(MultipartFile file) {
// 判斷文件是否為空
if (!file.isEmpty()) {
try {
// 文件保存路徑
String filePath = request.getSession().getServletContext().getRealPath("/") + "upload/"
+ file.getOriginalFilename();
// 轉存文件
file.transferTo(new File(filePath));
return true;
} catch (Exception e) {
e.printStackTrace();
}
}
return false;
}
3、編寫action:
@RequestMapping("filesUpload")
public String filesUpload(@RequestParam("files") MultipartFile[] files) {
//判斷file數組不能為空並且長度大於0
if(files!=null&&files.length>0){
//循環獲取file數組中得文件
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";
}

C. spring mvc word文件上傳功能

springmvc文件上傳
1.加入jar包：
commons-fileupload-1.2.2.jar
commons-io-2.0.1.jar
lperson.java中加屬性，實現get ,set方法
private String photoPath;
2.創建WebRoot/upload目錄，存放上傳的文件

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行文件上傳框，不能和實體對象屬性同名，類型不同

controller配置

1 12、文件上傳功能實現配置文件上傳解析器
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」); //設定文件保存的目錄
10
11 String filename = file.getOriginalFilename(); //得到上傳時的文件名
12 FileUtils.writeByteArrayToFile(new File(dir,filename), file.getBytes());
13
14 p.setPhotoPath(「/upload/」+filename); //設置圖片所在路徑
15
16 System.out.println("upload over. "+ filename);
17 }
18 ps.saveOrUpdate(p);
19 return "redirect:/person/list.action"; //重定向
20 }

3.文件上傳功能實現 spring-mvc.xml 配置文件上傳解析器

1 
2 <bean id="multipartResolver"
3 class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
4 <property name="maxUploadSize" value=「10485760"/>
5 </bean>
6
7 maxUploadSize以位元組為單位：10485760 =10M id名稱必須這樣寫

1 映射資源目錄
2 <mvc:resources location="/upload/" mapping="/upload/**"/>

隨即文件名常用的三種方式：
文件上傳功能（增強：防止文件重名覆蓋）
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 }

圖片顯示 personList.jsp
1 <td><img src="${pageContext.request.contextPath}${p.photoPath}">${p.photoPath}</td>

D. 請教spring mvc 的文件上傳

E. spring mvc 實現多個文件上傳 List<MultipartFile> files = request.getFiles("file"); 報錯

CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(request.getSession().getServletContext());
//判斷request是否有文件需要上傳
if (multipartResolver.isMultipart(request)) {
//轉換成多部分request
MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest) request;
//讀取文件
List<MultipartFile> file = multiRequest.getFiles("file");

F. springmvc怎麼上傳文件

spring mvc(註解)上傳文件的簡單例子,這有幾個需要注意的地方
1.form的enctype=」multipart/form-data」這個是上傳文件必須的
2.applicationContext.xml中 <bean id=」multipartResolver」 class=」org.springframework.web.multipart.commons.CommonsMultipartResolver」/> 關於文件上傳的配置不能少

大家可以看具體代碼如下:

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("開始");
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>上傳圖片</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>上傳結果</title>
</head>
<body>
<img alt="" src="${fileUrl }" />
</body>
</html>

G. spring文件上傳

萬變不離其宗，要實現文件的上傳需要對應的JAR包：
1、commons-fileupload-1.2.2.jar
2、commons-io-2.0.1.jar

H. springmvc怎麼實現文件上傳

springmvc怎麼實現文件上傳

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 {

/** 日誌對象*/
private Log logger = LogFactory.getLog(this.getClass());

private static final long serialVersionUID = 1L;

/** 上傳目錄名*/
private static final String uploadFolderName = "uploadFiles";

/** 允許上傳的擴展名*/
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");

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

// 判斷文件是否存在
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();
}

}

I. spring mvc上傳文件到指定的文件夾中，新手不會，

第一個參數是你的前台傳遞進來的文件。

第二個參數是request對象。
第三個參數是spring mvc 綁定數據用的對象。
根據你的代碼你的第三個參數可以不要。

第一個參數是前台form當中有個類似於<input type="file" name="file"/>的控制項傳遞過來的文件。

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