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[Java教程]基于spring 3.0mvc 框架的文件上传实现


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:

  1. apache-commons-fileupload.jar
  2. apache-commons-io.jar

第二步:2.  在springmvc-servlet.

<??><beans  ="http://www.springframework.org/schema/beans"  ="http://www.springframework.org/schema/context"  ="http://www.springframework.org/schema/p"  ="http://www.springframework.org/schema/mvc"  ="http://www.w3.org/2001/  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 ></bean>  <bean ></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.

 1 <??> 2 <web-app version="2.5"  3   ="http://java.sun.com/  4   ="http://www.w3.org/2001/  5   xsi:schemaLocation="http://java.sun.com/ 6   http://java.sun.com/>  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.</param-value>20   </init-param>21   <load-on-startup>1</load-on-startup>22  </servlet>23  24  <!-- 解决乱码 -->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页面,内容如下:

 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>测试springmvc中上传的实现</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    文件上传:<input type="file" value="" name="file"> 26   <input type="submit" value="上传"/>27  </form>28  </body>29 </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>

  1. 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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