基于spring 3.0mvc 框架的文件上传实现

2023-02-13 08:18:54

Spring 框架提供了构建 Web 应用程序的全功能 MVC 模块。使用 Spring 可插入的 MVC 架构，可以选择是使用内置的 Spring Web 框架还是 Struts 这样的 Web 框架。通过策略接口，Spring 框架是高度可配置的，而且包含多种视图技术，例如 JavaServer Pages（JSP）技术、Velocity、Tiles、iText 和 POI。Spring MVC 框架并不知道使用的视图，所以不会强迫您只使用 JSP 技术。Spring MVC 分离了控制器、模型对象、分派器以及处理程序对象的角色，这种分离让它们更容易进行定制。

第一步：1. spring使用了apache-commons下得上传组件，因此，我们需要引入两个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">

    <!-- 扫描包 -->

    <context:component-scan base-package="com.tgb.web.controller.annotation"/>

    <!-- 启用注解包 -->

    <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>

    -->

   <!-- 视图解析器 -->

    <bean id="viewResolver"

        class="org.springframework.web.servlet.view.InternalResourceViewResolver">

        <property name="prefix" value="/" />

        <property name="suffix" value=".jsp" />

    </bean> 

     <!-- 上传配置文件 -->

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

             <!-- 默认编码 (ISO-8859-1) -->

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

             <!-- 最大文件大小，-1为无限止(-1) -->

             <property name="maxUploadSize" value="20000000000"/>

             <!-- 最大内存大小 (10240)-->

             <property name="maxInMemorySize" value="200000"/>

    </bean>

    <!-- 静态资源访问 -->

<!--     <mvc:resources location="/images/" mapping="/images/**"/>-->

 </beans>

第三步：配置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"> 

   <welcome-file-list>

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

   </welcome-file-list>

   <servlet>

      <servlet-name>springMVC</servlet-name>

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

      <init-param>

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

        <param-value>classpath*:config/springMVC-servlet.xml</param-value>

      </init-param>

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

   </servlet>

    <!-- 解决乱码 -->

     <filter>

        <filter-name>encodingFilter</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>

          <init-param>

            <param-name>froceEncoding</param-name>

             <param-value>true</param-value>

         </init-param>

     </filter>   

      <filter-mapping>

          <filter-name>encodingFilter</filter-name>

          <url-pattern>/*</url-pattern>

      </filter-mapping>   

   <servlet-mapping>

     <servlet-name>springMVC</servlet-name>

     <url-pattern>/</url-pattern>

   </servlet-mapping>

 </web-app>

第四步：建立upload.jsp页面，内容如下：

 <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

 <%

 String path = request.getContextPath();

 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

 %>

 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

 <html>

   <head>

     <base href="<%=basePath%>">

     <title>测试springmvc中上传的实现</title>

     <meta http-equiv="pragma" content="no-cache">

     <meta http-equiv="cache-control" content="no-cache">

     <meta http-equiv="expires" content="0">

     <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

     <meta http-equiv="description" content="This is my page">

     <!--

     <link rel="stylesheet" type="text/css" href="styles.css">

     -->

   </head>

   <body>

    <form action="uploadContoller?toupload" method="post" enctype="multipart/form-data">

        文件上传:<input type="file" value="" name="file">

      <input  type="submit" value="上传"/>

    </form>

   </body>

 </html>

建立控制器UploadContoller.java（三种方法支持文件上传），代码如下：

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 {

    //========================第一种：======================

    @RequestMapping(params="uploadUser")

    // 普通上传

    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";

    }

    //========================第二种：======================

    @RequestMapping(params="toupload")

    public String toupload(HttpServletRequest request,

            HttpServletResponse response) {

        // 创建一个通用的多部分解析器

        CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(

                request.getSession().getServletContext());

        // 判断 request 是否有文件上传,即多部分请求

        if (multipartResolver.isMultipart(request)) {

            // 转换成多部分request

            MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest) request;

            // 取得request中的所有文件名

            Iterator<String> iter = multiRequest.getFileNames();

            while (iter.hasNext()) {

                // 记录上传过程起始时的时间，用来计算上传时间

                int pre = (int) System.currentTimeMillis();

                // 取得上传文件

                MultipartFile file = multiRequest.getFile(iter.next());

                if (file != null) {

                    // 取得当前上传文件的文件名称

                    String myFileName = file.getOriginalFilename();

                    // 如果名称不为“”,说明该文件存在，否则说明该文件不存在

                    if (myFileName.trim() != "") {

                        System.out.println(myFileName);

                        // 重命名上传后的文件名

                        String fileName = "demoUpload"

                                + file.getOriginalFilename();

                        // 定义上传路径

                        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();

                        }

                    }

                }

                // 记录上传该文件后的时间

                int finaltime = (int) System.currentTimeMillis();

                System.out.println(finaltime - pre);

            }

        }

        return "success";

    }

    //========================第三种：======================

    @RequestMapping(params="niceupload")

    // 优化上传

    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页面

<%@ 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>传递参数</title>

  </head>

  <body>

    <h1>上传成功    +++++++++++</h1>

  </body>

</html>

发布项目，运行测试：http://localhost:8080/springmvc03/upload.jsp

3、进入项目发布后的目录，发现文件上传成功：

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