spring_mvc 文件的上传

需要的依赖

<dependencies>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>5.0.2.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>5.0.2.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-web</artifactId>
      <version>5.0.2.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>jsp-api</artifactId>
      <version>2.0</version>
    </dependency>
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>servlet-api</artifactId>
      <version>2.5</version>
    </dependency>
    <dependency>
      <groupId>commons-fileupload</groupId>
      <artifactId>commons-fileupload</artifactId>
      <version>1.3.1</version>
    </dependency>
    <dependency>
      <groupId>commons-io</groupId>
      <artifactId>commons-io</artifactId>
      <version>2.6</version>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
      <version>2.9.0</version>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-core</artifactId>
      <version>2.9.0</version>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-annotations</artifactId>
      <version>2.9.0</version>
    </dependency>
  </dependencies>

这是简单页面
<body>

    <h3>传统文件上传，一定是post提交，后面加上enctype="multipart/form-data"</h3>
    <form action="${pageContext.request.contextPath}/user/upload" method="post" enctype="multipart/form-data">
        选择文件：<input type="file" name="upload"> <br>
        <input type="submit" value="上传">
    </form>

    <h3>MVC文件上传，一定是post提交，后面加上enctype="multipart/form-data"</h3>
    <form action="${pageContext.request.contextPath}/user/upload2" method="post" enctype="multipart/form-data">
        选择文件：<input type="file" name="upload"> <br>
        <input type="submit" value="上传">
    </form>
</body>

web.xml配置文件


<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
  <display-name>Archetype Created Web Application</display-name>
   <!--前端控制器-->
  <servlet>
    <servlet-name>DispatcherServlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:spring_mvc.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>DispatcherServlet</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>
   <!--编码过滤器-->
  <filter>
    <filter-name>CharacterEncodingFilter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <!--请求-->
 <init-param>
    <param-name>encoding</param-name>
    <param-value>utf-8</param-value>
  </init-param>
  <!--响应-->
    <init-param>
      <param-name>forceEncoding</param-name>
      <param-value>true</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>CharacterEncodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
</web-app>

spring-mvc的配置文件

<?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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
    <!--开启扫描包---->
    <context:component-scan base-package="cn.luo"></context:component-scan>
    <!--视图解析器---->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>
    <!--配置文件解析器对象-->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
       <!--设置文件最大上传的大小-->
       <property name="maxUploadSize" value="10485760"></property>
    </bean>
</beans>

测试类的编写

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.io.IOException;
import java.util.List;
import java.util.UUID;

@Controller
@RequestMapping("/user")
public class UpLoad {
    //传统文件上传方式
    @RequestMapping("/upload")
    public String upload(HttpServletRequest request) {
      
        String path=request.getSession().getServletContext().getRealPath("/uploadss/");
        File file = new File(path);
        if (!file.exists()){
            file.mkdirs();
        }

        DiskFileItemFactory factory = new DiskFileItemFactory();

        ServletFileUpload upload = new ServletFileUpload(factory);

        List<FileItem> items = null;
        try {
            items = upload.parseRequest(request);
        } catch (FileUploadException e) {
            e.printStackTrace();
        }
        System.out.println("items"+items);
       
        for (FileItem item:items){
            
            if (item.isFormField()){

            }else{
//                获取文件上传的名称

                String itemName = item.getName();
//                完成文件上传"
               String uuid= UUID.randomUUID().toString().replace("-","");
               itemName=uuid+itemName;
                try {
                    item.write(new File(path,itemName));
                } catch (Exception e) {
                    e.printStackTrace();
                }
                //删除临时文件
                item.delete();
            }
        }
        
        return "success";
    }
    
    //MVC文件上传方式
    @RequestMapping("/upload2")
    public String upload2(HttpServletRequest request, MultipartFile upload) {
        //文件存取的路径
        String path=request.getSession().getServletContext().getRealPath("/uploads/");
        File file = new File(path);
        if (!file.exists()){
            file.mkdirs();
        }

//                获取文件上传的名称
        String filename = upload.getOriginalFilename();
//                完成文件上传"
                String uuid= UUID.randomUUID().toString().replace("-","");
                filename=uuid+filename;
        try {
            upload.transferTo(new File(path,filename));
        } catch (IOException e) {
            e.printStackTrace();
        }
        
        return "success";
    }
}

posted on 2019-08-17 18:46 汪汪爱学习阅读(83) 评论(0) 收藏举报

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spring_mvc 文件的上传

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