springmvc文件上传

最新推荐文章于 2020-10-22 16:15:07 发布

转载最新推荐文章于 2020-10-22 16:15:07 发布 · 312 阅读

一、准备

需要的jar

二、配置

1、 spmvc-servlet.xml

<?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"
        xmlns:mvc="http://www.springframework.org/schema/mvc"
        xmlns:util="http://www.springframework.org/schema/util"
        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
          http://www.springframework.org/schema/mvc   
          http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
          http://www.springframework.org/schema/util
          http://www.springframework.org/schema/util/spring-util-3.0.xsd">
      
    <!-- 默认的注解映射的支持 ,它会自动注册DefaultAnnotationHandlerMapping 与AnnotationMethodHandlerAdapter-->
    <mvc:annotation-driven />
     
    <!-- 自动扫描注解的Controller -->
    <context:component-scan base-package="com.wy.controller"
/>
     
    <bean
class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"
/>
     
    <!-- 映射处理器 -->
    <bean id="simpleUrlMapping"
        class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
        <property name="mappings">
            <props>
                <prop key="/fileUploadController.do">fileUploadController</prop>
            </props>
        </property>
    </bean>
     
    <!-- ParameterMethodNameResolver 解析请求参数，并将它匹配Controller中的方法名 -->
    <bean id="parameterMethodNameResolver"
        class="org.springframework.web.servlet.mvc.multiaction.ParameterMethodNameResolver">
        <property name="paramName"
value="action" 
/>
    </bean>
     
    <bean id="fileUploadController"
        class="com.wy.controller.FileUploadController">
        <property name="methodNameResolver"
            ref="parameterMethodNameResolver">
        </property>
    </bean>
     
    <!-- 文件上传表单的视图解析器 -->
    <bean id="multipartResolver" 
        class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> 
        <!-- one of the properties available; the maximum file size in bytes --> 
        <property name="maxUploadSize"
value="204800" 
/>  
    </bean> 
      
</beans>         

2、Controller

使用两种方式：

一种是基于注解的，另一种传统的方式HttpServletRequest

使用第二种方式时要注意：操作方法中对应的方法参数前两位必须是request,response对象并且都要加上，否则会出现 No request handling method with name 'insert' in class "ClassName"，页面显示为404错误
这个问题出现在使用多操作控制器情况下，相关的操作方法中对应的方法参数前两位必须是request,response对象，必须要有，否则会报如上异常。

package
com.wy.controller;
 
import
java.util.List;
 
import
javax.servlet.http.HttpServletRequest;
import
javax.servlet.http.HttpServletResponse;
import
javax.servlet.http.HttpSession;
 
import
org.springframework.stereotype.Controller;
import
org.springframework.util.MultiValueMap;
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.multipart.MultipartFile;
import
org.springframework.web.multipart.MultipartHttpServletRequest;
import
org.springframework.web.servlet.ModelAndView;
import
org.springframework.web.servlet.mvc.multiaction.MultiActionController;
 
@Controller
@RequestMapping("/fileUploadController")
public
class FileUploadController
extends MultiActionController {
 
    /**
     * 1、文件上传
     * @param request
     * @param response
     * @return
     */
    public
ModelAndView uploadFiles(HttpServletRequest request, HttpServletResponse response) {
        ModelAndView mav =
new ModelAndView();
        // 转型为MultipartHttpRequest
        MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
        // 获得上传的文件（根据前台的name名称得到上传的文件）
        MultiValueMap<String, MultipartFile> multiValueMap = multipartRequest.getMultiFileMap();
        List<MultipartFile> file = multiValueMap.get("clientFile");
        //MultipartFile file = multipartRequest.getFile("clientFile");
        if(!file.isEmpty()){
            //在这里就可以对file进行处理了，可以根据自己的需求把它存到数据库或者服务器的某个文件夹
            System.out.println("================="+file.get(0).getName()
 + file.get(0).getSize());
        }
          
        return
mav;
    }
 
    /**
     *
     * @param name
     * @param file
     * @param session
     * @return
     */
    @RequestMapping(value="/uploadFile",
 method=RequestMethod.POST)   
    public
String uploadFile(@RequestParam("fileName") String fileName,  
            @RequestParam("clientFile")
 MultipartFile clientFile, HttpSession session){   
        if
(!clientFile.isEmpty()) {
            //在这里就可以对file进行处理了，可以根据自己的需求把它存到数据库或者服务器的某个文件夹
            System.out.println("================="+clientFile.getSize());  
        }  
        return
"";   
    } 
 
}

对文件的具体实现

import 
java.io.File;
import 
java.io.IOException;
import 
java.util.Iterator;
import 
java.util.UUID;
 
import 
javax.servlet.http.HttpServletRequest;
import 
javax.servlet.http.HttpServletResponse;
 
import 
org.springframework.web.multipart.MultipartFile;
import 
org.springframework.web.multipart.MultipartHttpServletRequest;
import 
org.springframework.web.multipart.commons.CommonsMultipartResolver;
 
public 
class AddImage {
 
    public
String upload2(HttpServletRequest request,HttpServletResponse response, String fileName)
throws IllegalStateException, IOException {
        //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
                        fileName = UUID.randomUUID() +"+"+ file.getOriginalFilename();
                        //定义上传路径
                        String path =
"F:/workspace/myproject/WebRoot/image/" 
+ fileName;
                        File localFile =
new File(path);
                        file.transferTo(localFile);
                    }
                }
                //记录上传该文件后的时间
                int
finaltime = (int) System.currentTimeMillis();
                System.out.println(finaltime - pre);
                 
            }
        }
        return
fileName ;
    }
}

3、视图

upload.jsp

<%@ 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>
        <title>file upload test</title>
    </head>
    <body>
 
        <form method="post"
action="<%=path %>/fileUploadController/uploadFile"
enctype="multipart/form-data">
            文件名: <input type="text"
name="fileName" 
/><br/>
                    
            <input type="file"
name="clientFile"
/><br/>
            <input type="submit"
value="上传文件 "/>
        </form>
    </body>
</html>