SpringMVC两种方式实现多文件上传

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clypm 2023-11-09 11:01:00 博主文章分类：Spring整合 ©著作权

文章标签 spring java xml 文章分类 Html/CSS 前端开发

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springMVC实现多文件上传的方式有两种，一种是我们经常使用的以字节流的方式进行文件上传，另外一种是使用springMVC包装好的解析器进行上传。这两种方式对于实现多文件上传效率上却有着很大的差距，下面我们通过实例来看一下这两种方式的实现方式，同时比较一下在效率上到底存在着多大的差距。

1.下载相关jar包。需要引入的jar出了springMVC的jar包外，还需要引入com.springsource.org.apache.commons.fileupload-1.2.0.jar和com.springsource.org.apache.commons.io-1.4.0.jar。所有的jar包可以通过“点击这里”进行下载。

2.配置springAnnotation-servlet.xml文件（文件名称可以自定义，只要和web.xml中引入的名称一样即可）：

<?xml version="1.0" encoding="UTF-8"?>  
<!-- Bean头部 -->  
<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:mvc="http://www.springframework.org/schema/mvc"  
xmlns:context="http://www.springframework.org/schema/context"  
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  
>  
     
<!-- 注解扫描包 -->  
<context:component-scan  base-package="com.cl.web"></context:component-scan>  
<!-- 代替下面的两行代码 -->  
<mvc:annotation-driven/>  
    
<!-- 静态资源访问 -->  
<mvc:resources location="/img/" mapping="/img/**"/>  
<mvc:resources location="/js/" mapping="/js/**"/>  
     
     
<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">  
<property name="prefix" value="/"></property>  
<property name="suffix" value=".jsp"></property>  
      
</bean>  
     
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">  
<property name="defaultEncoding" value="utf-8"></property>   
<property name="maxUploadSize" value="10485760000"></property>  
<property name="maxInMemorySize" value="40960"></property>  
</bean>  
</beans>

3. 配置web.xml文件：

<?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>springMVC1</display-name>  
<welcome-file-list>  
<welcome-file>index.html</welcome-file>  
</welcome-file-list>  
    
<servlet>  
<servlet-name>springMVC</servlet-name>  
<!-- springMVC的分发器 -->  
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>  
<init-param>  
<param-name>contextConfigLocation</param-name>  
<param-value>classpath*:config/springAnnotation-servlet.xml</param-value>  
</init-param>  
<!-- 表示当Tomcat已启动的时候初始化这个Servlet -->  
<load-on-startup>1</load-on-startup>  
</servlet>  
    
<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> <!--设置你想用的字符集，我这里用的是GB18030-->    
</init-param>    
<init-param>  
<param-name>forceEncoding</param-name>  
<param-value>true</param-value>  
</init-param>  
</filter>    
      
<filter-mapping>    
<filter-name>encodingFilter</filter-name>    
<url-pattern>/*</url-pattern> <!--设置你想过滤的页面或者是Servlet，根据自己的需要配置-->    
</filter-mapping>    
   
<servlet-mapping>  
<servlet-name>springMVC</servlet-name>  
<url-pattern>/</url-pattern>  
</servlet-mapping>  
</web-app>

4. jsp页面代码：

<%@ page language="java" contentType="text/html; charset=UTF-8"  
pageEncoding="UTF-8"%>  
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">  
<html>  
<head>  
<script type="text/javascript" src="../js/jquery-1.7.2.js"></script>  
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">  
<title>Insert title here</title>  
<script type="text/javascript">  
i = 1;  
j = 1;  
    $(document).ready(function(){  
          
        $("#btn_add1").click(function(){  
<div id="div_'+i+'"><input  name="file" type="file"  /><input type="button" value="删除"  onclick="del_1('+i+')"/></div>';  
i = i + 1;  
        });  
          
        $("#btn_add2").click(function(){  
<div id="div_'+j+'"><input  name="file_'+j+'" type="file"  /><input type="button" value="删除"  onclick="del_2('+j+')"/></div>';  
j = j + 1;  
        });  
    });  
  
    function del_1(o){  
     document.getElementById("newUpload1").removeChild(document.getElementById("div_"+o));  
    }  
      
    function del_2(o){  
         document.getElementById("newUpload2").removeChild(document.getElementById("div_"+o));  
    }  
  
</script>  
</head>  
<body>  
  
<h1>springMVC字节流输入上传文件</h1>   
<form name="userForm1" action="/springMVC7/file/upload" enctype="multipart/form-data" method="post">  
<div id="newUpload1">  
<input type="file" name="file">  
</div>  
          
<input type="button" id="btn_add1" value="增加一行" >  
<input type="submit" value="上传" >  
</form>   
<br>  
<br>  
<hr align="left" width="60%" color="#FF0000" size="3">  
<br>  
<br>  
<h1>springMVC包装类上传文件</h1>   
<form name="userForm2" action="/springMVC7/file/upload2" enctype="multipart/form-data" method="post"">  
<div id="newUpload2">  
<input type="file" name="file">  
</div>  
<input type="button" id="btn_add2" value="增加一行" >  
<input type="submit" value="上传" >  
          
          
</form>   
</body>  
</html>

5.实现上传功能的java bean：

import java.io.File;  
import java.io.FileInputStream;  
import java.io.FileOutputStream;  
import java.io.IOException;  
import java.io.PrintWriter;  
import java.io.UnsupportedEncodingException;  
import java.net.URLDecoder;  
import java.util.Date;  
import java.util.Iterator;  
  
import javax.servlet.http.HttpServletRequest;  
import javax.servlet.http.HttpServletResponse;  
import javax.swing.filechooser.FileNameExtensionFilter;  
  
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.multipart.MultipartFile;  
import org.springframework.web.multipart.MultipartHttpServletRequest;  
import org.springframework.web.multipart.commons.CommonsMultipartFile;  
import org.springframework.web.multipart.commons.CommonsMultipartResolver;  
import org.springframework.web.servlet.ModelAndView;  
  
 
  
@Controller  
@RequestMapping("/file")  
public class UploadController {   
      
      
@RequestMapping("/upload"   )  
public String addUser(@RequestParam("file") CommonsMultipartFile[] files,HttpServletRequest request){  
          
for(int i = 0;i<files.length;i++){  
"fileName---------->" + files[i].getOriginalFilename());  
          
if(!files[i].isEmpty()){  
int pre = (int) System.currentTimeMillis();  
try {  
//拿到输出流，同时重命名上传的文件  
new FileOutputStream("H:/" + new Date().getTime() + files[i].getOriginalFilename());  
//拿到上传文件的输入流  
                    FileInputStream in = (FileInputStream) files[i].getInputStream();  
                      
//以写字节的方式写文件  
int b = 0;  
while((b=in.read()) != -1){  
                        os.write(b);  
                    }  
                    os.flush();  
                    os.close();  
                    in.close();  
int finaltime = (int) System.currentTimeMillis();  
                    System.out.println(finaltime - pre);  
                      
catch (Exception e) {  
                    e.printStackTrace();  
"上传出错");  
                }  
        }  
        }  
return "/success";  
    }  
      
      
@RequestMapping("/upload2"  )  
public String upload2(HttpServletRequest request,HttpServletResponse response) throws IllegalStateException, IOException {  
//创建一个通用的多部分解析器  
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  
"demoUpload" + file.getOriginalFilename();  
//定义上传路径  
"H:/" + fileName;  
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 "/success";  
    }  
      
@RequestMapping("/toUpload" )   
public String toUpload() {  
          
return "/upload";  
    }  
      
}

SpringMVC两种方式实现多文件上传_spring