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

2021-02-01 11:59:29 作者：jiawei3998

这篇文章主要介绍了SpringMVC 通过commons-fileupload实现文件上传,本文通过实例代码给大家介绍的非常详细，对大家的学习或工作具有一定的参考借鉴价值，需要的朋友可以参考下

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>

到此这篇关于SpringMVC 通过commons-fileupload实现文件上传的文章就介绍到这了,更多相关SpringMVC 实现文件上传内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家！