Springmvc实现文件上传-6ren

Springmvc实现文件上传

转载作者：qq735679552 更新时间：2022-09-28 22:32:09

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本文实例为大家分享了springmvc实现文件上传的具体代码，供大家参考，具体内容如下。

1.环境搭建

在maven的pom.xml文件中导入两个依赖。

1).commons-fileupload 2).commons-io 。

在resources目录下的springmvc.xml文件中配置multipartresolver 。

 
    ? 
   
         <?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" 
        
         xsi:schemalocation=" 
        
         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.xsd 
        
         http: 
         //www.springframework.org/schema/beans 
        
         http: 
         //www.springframework.org/schema/beans/spring-beans.xsd"> 
        
         <!--包扫描--> 
        
         <context:component-scan base- 
         package 
         = 
         "cn.itcast" 
         ></context:component-scan> 
        
         <!--配置multipartresolver,注意:id名称固定为multipartresolver--> 
        
         <bean id= 
         "multipartresolver" 
         class 
         = 
         "org.springframework.web.multipart.commons.commonsmultipartresolver" 
         > 
        
         </bean> 
        
         <mvc:annotation-driven ></mvc:annotation-driven> 
        
         <!--让静态资源不经过过滤器--> 
        
         <mvc:resources mapping= 
         "/js/**" 
         location= 
         "/js/" 
         ></mvc:resources> 
        
         <!--视图解析器给controller中返回的逻辑视图名加上前缀和后缀--> 
        
         <bean id= 
         "internalresourceviewresolver" 
         class 
         = 
         "org.springframework.web.servlet.view.internalresourceviewresolver" 
         > 
        
         <property name= 
         "prefix" 
         value= 
         "/web-inf/pages/" 
         ></property> 
        
         <property name= 
         "suffix" 
         value= 
         ".jsp" 
         ></property> 
        
         </bean> 
        
         </beans>

2.编写前台测试jsp 。

 
    ? 
   
         <form action= 
         "/test/file" 
         method= 
         "post" 
         enctype= 
         "multipart/form-data" 
         > 
        
         上传的文件:<input type= 
         "file" 
         name= 
         "upload" 
         ><br/> 
        
         密钥:<input type= 
         "text" 
         name= 
         "password" 
         ><br/> 
        
         <input type= 
         "submit" 
         value= 
         "提交" 
         > 
        
         </form>

注意页面三要素

1).表单提交方式必须为post 。

2).表单中必须有file域,即type="file" 。

3).表单中enctype="multipart/form-data" 。

3.编写后台测试代码。

 
    ? 
   
         @controller 
        
         @requestmapping 
         ( 
         "/test" 
         ) 
        
         public 
         class 
         fileuploadcontroller { 
        
         @requestmapping 
         ( 
         "/file" 
         ) 
        
         public 
         string testfileupload(httpservletrequest request, multipartfile upload)  
         throws 
         ioexception {  
        
         //upload是表单中文件name属性值,必须保持一致 
        
         system.out.println( 
         "testfileupload..." 
         ); 
        
         string realpath = request.getsession().getservletcontext().getrealpath( 
         "/uploads" 
         ); 
        
         file file =  
         new 
         file(realpath); 
        
         if 
         (!file.exists()){ 
        
         file.mkdirs(); 
         //创建文件夹 
        
         } 
        
         string filename = upload.getoriginalfilename();  
         //获取文件名 
        
         string name = upload.getname(); 
         //获取表单中的name属性值 即upload 
        
         string uuid = uuid.randomuuid().tostring().replaceall( 
         "-" 
         ,  
         "" 
         ); 
         //生成uuid避免文件名重复导致冲突覆盖 
        
         filename=uuid+ 
         "_" 
         +filename; 
        
         upload.transferto( 
         new 
         file(file,filename)); 
        
         return 
         "forward:success.jsp" 
         ; 
        
         }