基于spring3.0mvc框架的文件上傳實現

2019-11-14 15:35:56

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SPRing 框架提供了構建 Web 應用程序的全功能 MVC 模塊。使用 Spring 可插入的 MVC 架構，可以選擇是使用內置的 Spring Web 框架還是 Struts 這樣的 Web 框架。通過策略接口，Spring 框架是高度可配置的，而且包含多種視圖技術，例如 javaServer Pages（jsp）技術、Velocity、Tiles、iText 和 POI。Spring MVC 框架并不知道使用的視圖，所以不會強迫您只使用 JSP 技術。Spring MVC 分離了控制器、模型對象、分派器以及處理程序對象的角色，這種分離讓它們更容易進行定制。

第一步：1. spring使用了apache-commons下得上傳組件，因此，我們需要引入兩個jar包：

apache-commons-fileupload.jar
apache-commons-io.jar

第二步：2. 在springmvc-servlet.xml配置文件中，增加CommonsMultipartResoler配置：

<?xml version="1.0" encoding="UTF-8" ?><beans    xmlns="http://www.springframework.org/schema/beans"    xmlns:context="http://www.springframework.org/schema/context"    xmlns:p="http://www.springframework.org/schema/p"    xmlns:mvc="http://www.springframework.org/schema/mvc"    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    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.xsd    http://www.springframework.org/schema/mvc    http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">    <!-- 掃描包 -->    <context:component-scan base-package="com.tgb.web.controller.annotation"/>    <!-- 啟用注解包 -->    <mvc:annotation-driven/>    <!-- 被上面替代     <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"></bean>    <bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping"></bean>    -->      <!-- 視圖解析器 -->    <bean id="viewResolver"        class="org.springframework.web.servlet.view.InternalResourceViewResolver">        <property name="prefix" value="/" />        <property name="suffix" value=".jsp" />    </bean>           <!-- 上傳配置文件 -->      <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">              <!-- 默認編碼 (ISO-8859-1) -->               <property name="defaultEncoding" value="utf-8"/>              <!-- 最大文件大小，-1為無限止(-1) -->               <property name="maxUploadSize" value="20000000000"/>              <!-- 最大內存大小 (10240)-->               <property name="maxInMemorySize" value="200000"/>     </bean>    <!-- 靜態資源訪問 --> <!--     <mvc:resources location="/images/" mapping="/images/**"/>-->          </beans>

第三步：配置web.xml

 1 <?xml version="1.0" encoding="UTF-8"?> 2 <web-app version="2.5"  3     xmlns="http://java.sun.com/xml/ns/javaee"  4     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  5     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee  6     http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">  7    8    9   10   <welcome-file-list>11     <welcome-file>index.jsp</welcome-file>12   </welcome-file-list>13   14   <servlet>15      <servlet-name>springMVC</servlet-name>16      <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>17      <init-param>18        <param-name>contextConfigLocation</param-name>19        <param-value>classpath*:config/springMVC-servlet.xml</param-value>20      </init-param>21      <load-on-startup>1</load-on-startup>22   </servlet>23   24    <!-- 解決亂碼 -->25     <filter>   26        <filter-name>encodingFilter</filter-name>   27         <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>   28         <init-param>   29            <param-name>encoding</param-name>   30             <param-value>UTF-8</param-value>   31         </init-param>  32          <init-param>   33            <param-name>froceEncoding</param-name>   34             <param-value>true</param-value>   35         </init-param> 36     </filter>   37         38      <filter-mapping>   39          <filter-name>encodingFilter</filter-name>   40          <url-pattern>/*</url-pattern>   41      </filter-mapping>   42   43     44   45   <servlet-mapping>46     <servlet-name>springMVC</servlet-name>47     <url-pattern>/</url-pattern>48   </servlet-mapping>49 </web-app>

第四步：建立upload.jsp頁面，內容如下：

 1 <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> 2 <% 3 String path = request.getContextPath(); 4 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 5 %> 6  7 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 8 <html> 9   <head>10     <base href="<%=basePath%>">11     12     <title>測試springmvc中上傳的實現</title>13     <meta http-equiv="pragma" content="no-cache">14     <meta http-equiv="cache-control" content="no-cache">15     <meta http-equiv="expires" content="0">    16     <meta http-equiv="keyWords" content="keyword1,keyword2,keyword3">17     <meta http-equiv="description" content="This is my page">18     <!--19     <link rel="stylesheet" type="text/CSS" href="styles.css">20     -->21   </head>22   23   <body>24    <form action="uploadContoller?toupload" method="post" enctype="multipart/form-data">25        文件上傳:<input type="file" value="" name="file"> 26      <input  type="submit" value="上傳"/>27    </form>28   </body>29 </html>

建立控制器UploadContoller.java（三種方法支持文件上傳），代碼如下：

package com.tgb.web.controller.annotation;import java.io.File;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.util.Date;import java.util.Iterator;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestParam;import org.springframework.web.multipart.MultipartFile;import org.springframework.web.multipart.MultipartHttpServletRequest;import org.springframework.web.multipart.commons.CommonsMultipartFile;import org.springframework.web.multipart.commons.CommonsMultipartResolver;@Controller@RequestMapping("/uploadContoller")public class UploadContoller {    //========================第一種：======================    @RequestMapping(params="uploadUser")    // 普通上傳    public String uploadUser(@RequestParam("file") CommonsMultipartFile file,            HttpServletRequest request, HttpServletResponse response)            throws IOException {        System.out.println("filename++++++++" + file.getOriginalFilename());        if (!file.isEmpty()) {            try {                Date date = new Date();                            FileOutputStream os = new FileOutputStream("../images"                        + date.getTime() + file.getOriginalFilename());                InputStream in = file.getInputStream();                int b = 0;                while ((b = in.read()) != -1) {                    os.write(b);                }                os.flush();                os.close();                in.close();            } catch (FileNotFoundException e) {                // TODO Auto-generated catch block                e.printStackTrace();            }        }        return "success";    }            //========================第二種：======================    @RequestMapping(params="toupload")    public String toupload(HttpServletRequest request,            HttpServletResponse response) {        // 創建一個通用的多部分解析器        CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(                request.getsession().getServletContext());        // 判斷 request 是否有文件上傳,即多部分請求        if (multipartResolver.isMultipart(request)) {            // 轉換成多部分request            MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest) request;            // 取得request中的所有文件名            Iterator<String> iter = multiRequest.getFileNames();            while (iter.hasNext()) {                // 記錄上傳過程起始時的時間，用來計算上傳時間                int pre = (int) System.currentTimeMillis();                // 取得上傳文件                MultipartFile file = multiRequest.getFile(iter.next());                if (file != null) {                    // 取得當前上傳文件的文件名稱                    String myFileName = file.getOriginalFilename();                    // 如果名稱不為“”,說明該文件存在，否則說明該文件不存在                    if (myFileName.trim() != "") {                        System.out.println(myFileName);                        // 重命名上傳后的文件名                        String fileName = "demoUpload"                                + file.getOriginalFilename();                        // 定義上傳路徑                        String path = "/images/" + fileName;                        File localFile = new File(path);                        try {                            file.transferTo(localFile);                        } catch (IllegalStateException e) {                            // TODO Auto-generated catch block                            e.printStackTrace();                        } catch (IOException e) {                            // TODO Auto-generated catch block                            e.printStackTrace();                        }                    }                }                // 記錄上傳該文件后的時間                int finaltime = (int) System.currentTimeMillis();                System.out.println(finaltime - pre);            }        }        return "success";    }    //========================第三種：======================    @RequestMapping(params="niceupload")    // 優化上傳    public String niceupload(HttpServletRequest request,            HttpServletResponse response) {        CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(                request.getSession().getServletContext());        if (multipartResolver.isMultipart(request)) {            MultipartHttpServletRequest mulitRequest = (MultipartHttpServletRequest) (request);            Iterator<String> iterator = mulitRequest.getFileNames();            while (iterator.hasNext()) {                MultipartFile fiel = mulitRequest.getFile((String) iterator                        .next());                if (fiel != null) {                    String fileName = "demoUpload" + fiel.getOriginalFilename();                    String path = "D:/" + fileName;                    File localfile = new File(path);                    try {                        fiel.transferTo(localfile);                    } catch (IllegalStateException e) {                        // TODO Auto-generated catch block                        e.printStackTrace();                    } catch (IOException e) {                        // TODO Auto-generated catch block                        e.printStackTrace();                    }                }            }        }        return "/success";    }}

5. 建立success.jsp頁面

<%@ page language="java" import="java.util.*"  contentType="text/html;charset=utf-8" pageEncoding="utf-8"%><%@taglib uri="http://java.sun.com/jsp/jstl/core"  prefix="c"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>      <title>傳遞參數</title>  </head>    <body>          <h1>上傳成功    +++++++++++</h1>  </body></html>

發布項目，運行測試：http://localhost:8080/springmvc03/upload.jsp

3、進入項目發布后的目錄，發現文件上傳成功：

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