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SpringMVC 通过commons-fileupload实现文件上传功能

来源:互联网 作者:佚名 时间:2021-09-11 05:17
目录 配置 web.xml SpringMVC配置文件 applicationContext.xml 文件上传 Controller 上传实现一 上传实现二 测试 依赖 配置 web.xml xml version="1.0" encoding="UTF-8"web-app xmlns="https://jakarta.ee/xml/ns/jakartaee" xmlns:xsi="http://www.w3.org/
目录
  • 配置
    • web.xml
    • SpringMVC配置文件 applicationContext.xml
  • 文件上传 Controller
    • 上传实现一
    • 上传实现二
  • 测试
    • 依赖

      配置

      web.xml

      <?xml version="1.0" encoding="UTF-8"?>
      <web-app xmlns="https://jakarta.ee/xml/ns/jakartaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="https://jakarta.ee/xml/ns/jakartaee https://jakarta.ee/xml/ns/jakartaee/web-app_5_0.xsd"
         version="5.0">
       <!--注册DispatcherServlet-->
       <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
         <param-name>contextConfigLocation</param-name>
         <param-value>classpath:applicationContext.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
       </servlet>
       <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
       </servlet-mapping>
      </web-app>

      SpringMVC配置文件 applicationContext.xml

      上传文件的核心配置类:CommonsMultipartResolver,注意id="multipartResolver"不要写错

      <?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/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        https://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/mvc
        https://www.springframework.org/schema/mvc/spring-mvc.xsd">
      
       <!--配置自动扫描controller包-->
       <context:component-scan base-package="com.pro.controller"/>
       <!--配置静态资源过滤-->
       <mvc:default-servlet-handler/>
       <!--配置注解驱动-->
       <mvc:annotation-driven/>
      
       <!--配置视图解析器-->
       <bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <!--前缀-->
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <!--后缀-->
        <property name="suffix" value=".jsp"/>
       </bean>
      
       <!--SpringMVC文件上传配置-->
       <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <!--设置请求的编码格式, 必须和pageEncoding的属性一致, 以便正确读取表单的值, 默认为ISO-8859-1-->
        <property name="defaultEncoding" value="utf-8"/>
        <!--上传文件的大小限制, 单位为字节 (10485760 = 10M)-->
        <property name="maxUploadSize" value="10485760"/>
        <property name="maxInMemorySize" value="40960"/>
       </bean>
      </beans>

      文件上传 Controller

      上传实现一

      package com.pro.controller;
      
      import org.springframework.web.bind.annotation.RequestMapping;
      import org.springframework.web.bind.annotation.RequestParam;
      import org.springframework.web.bind.annotation.RestController;
      import org.springframework.web.multipart.commons.CommonsMultipartFile;
      
      import javax.servlet.http.HttpServletRequest;
      import javax.servlet.http.HttpServletResponse;
      import java.io.*;
      import java.net.URLEncoder;
      import java.util.HashMap;
      import java.util.Map;
      
      @RestController
      public class FileController {
        /*
         * 采用file.transferTo 来保存上传的文件
         */
        @RequestMapping("/upload2")
        public Map fileUpload2(@RequestParam("file") CommonsMultipartFile file, HttpServletRequest request) throws IOException {
      
          //上传路径保存设置
          String path = request.getServletContext().getRealPath("/upload");
          File realPath = new File(path);
          if (!realPath.exists()){
            realPath.mkdir();
          }
          //上传文件地址
          System.out.println("上传文件保存地址 --> "+realPath);
      
          //通过CommonsMultipartFile的方法直接写文件(注意这个时候)
          file.transferTo(new File(realPath +"/"+ file.getOriginalFilename()));
      
          Map<Object, Object> hashMap = new HashMap<>();
          hashMap.put("code", 0);
          hashMap.put("msg", "上传成功");
      
          return hashMap;
        }
      }

      上传实现二

      这里的文件名称没有使用 UUID组合名称 为了方便测试

      package com.pro.controller;
      
      import org.springframework.web.bind.annotation.RequestMapping;
      import org.springframework.web.bind.annotation.RequestParam;
      import org.springframework.web.bind.annotation.RestController;
      import org.springframework.web.multipart.commons.CommonsMultipartFile;
      
      import javax.servlet.http.HttpServletRequest;
      import javax.servlet.http.HttpServletResponse;
      import java.io.*;
      import java.net.URLEncoder;
      import java.util.HashMap;
      import java.util.Map;
      
      @RestController
      public class FileController {
      
        // @RequestParam("file") 将 name=file 控件得到的文件封装成 CommonsMultipartFile 对象
        // 批量上传把 CommonsMultipartFile 改为数组即可
        @RequestMapping("/upload")
        public String upload(@RequestParam("file") CommonsMultipartFile file, HttpServletRequest request) throws IOException {
          // 获取文件名称
          String uploadFileName = file.getOriginalFilename();
      
          // 如果文件名为空, 直接返回首页
          if ("".equals(uploadFileName)) {
            return "file upload error";
          }
      
          System.out.println("上传文件名 --> " + uploadFileName);
      
      
          // 设置文件的保存位置
          String path = request.getServletContext().getRealPath("/upload");
          // 判断路径是否存在
          File realPath = new File(path);
          if (!realPath.exists()) {
            // 如果不存在就创建
            realPath.mkdir();
          }
      
          System.out.println("文件保存路径 --> " + realPath);
      
          // 获取文件输入流
          InputStream is = file.getInputStream();
          // 获取文件输出流
          FileOutputStream os = new FileOutputStream(new File(realPath, uploadFileName));
      
          // 缓冲区读写文件
          byte[] buffer = new byte[1024];
          int len;
          while ((len = is.read(buffer)) != -1) {
            os.write(buffer, 0, len);
            os.flush();
          }
      
          // 关闭流
          os.close();
          is.close();
      
          return "file upload success";
        }
      }

      测试

      <%@ page contentType="text/html;charset=UTF-8" language="java" %>
      <html>
       <head>
        <title>$Title$</title>
       </head>
       <body>
        <form enctype="multipart/form-data" action="${pageContext.request.contextPath}/upload2" method="post">
         <input type="file" name="file">
         <input type="submit" value="上传实现一">
        </form>
        
        
        <form enctype="multipart/form-data" action="${pageContext.request.contextPath}/upload" method="post">
         <input type="file" name="file">
         <input type="submit" value="上传实现二">
        </form>
       </body>
      </html>

      依赖

      核心依赖就是 commons-fileupload

      <!--导入依赖-->
      <dependencies>
        <!--单元测试-->
        <dependency>
          <groupId>junit</groupId>
          <artifactId>junit</artifactId>
          <version>4.13</version>
        </dependency>
        <!--spring-->
        <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-webmvc</artifactId>
          <version>5.2.0.RELEASE</version>
        </dependency>
        <!--文件上传-->
        <dependency>
          <groupId>commons-fileupload</groupId>
          <artifactId>commons-fileupload</artifactId>
          <version>1.3.3</version>
        </dependency>
        <!--servlet-api导入高版本的-->
        <dependency>
          <groupId>javax.servlet</groupId>
          <artifactId>javax.servlet-api</artifactId>
          <version>4.0.1</version>
        </dependency>
        <!--jsp-->
        <dependency>
          <groupId>javax.servlet.jsp</groupId>
          <artifactId>jsp-api</artifactId>
          <version>2.2</version>
        </dependency>
        <!--jstl表达式-->
        <dependency>
          <groupId>javax.servlet</groupId>
          <artifactId>jstl</artifactId>
          <version>1.2</version>
        </dependency>
      </dependencies>

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