springboot之上传文件功能的实现

太过爱你忘了你带给我的痛 2022-03-10 14:10 220阅读 0赞

1.新建一个maven项目，添加pom.xml相关内容，设置jdk是1.7，增加spring-boot启动器

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
      <modelVersion>4.0.0</modelVersion>
      <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.10.RELEASE</version>
      </parent>
      <groupId>com.ws</groupId>
      <artifactId>07-spring-boot-fileupload</artifactId>
      <version>0.0.1-SNAPSHOT</version>
      
      
      <properties>
      	<java.version>1.7</java.version>
      </properties>
      
      <dependencies>
      
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
    </dependencies>
    </project>

在resources文件夹下创建static文件夹，设置静态页面upload.html,代码如下：

<!DOCTYPE html>
    <html>
    <head>
    <meta charset="UTF-8">
    <title>文件上传</title>
    </head>
    <body>
    	<form action="fileUploadController" method="post" enctype="multipart/form-data">
    		上传文件：<input type="file" name="filename"/><br/>
    		<input type="submit"/>
    	</form>
    </body>
    </html>

创建controller实现项目返回值的返回：

package com.ws.controller;
    
    import java.io.File;
    import java.util.HashMap;
    import java.util.Map;
    
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    import org.springframework.web.multipart.MultipartFile;
    
    /**
     * SpringBoot文件上传
     *
     *
     */
    //@Controller
    @RestController //表示该类下的方法的返回值会自动做json格式的转换
    public class FileUploadController {
    
    	/*
    	 * 处理文件上传
    	 */
    	@RequestMapping("/fileUploadController")
    	public Map<String, Object> fileUpload(MultipartFile filename)throws Exception{
    		System.out.println(filename.getOriginalFilename());//获取文件名称
    		filename.transferTo(new File(filename.getOriginalFilename()));
                    //将文件上传到e盘下的路径中
    		Map<String, Object> map = new HashMap<>();
    		map.put("msg", "ok");
                    //使用json将返回值返回
    		return map;
    	}
    }

设置启动类实现项目的启动

package com.ws;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    
    /**
     * SpringBoot文件上传
     *
     *
     */
    @SpringBootApplication
    public class App {
    
    	public static void main(String[] args) {
    		SpringApplication.run(App.class, args);
    
    	}
    
    }

运行项目，在控制台中输入：[http://localhost:8080/upload.html][http_localhost_8080_upload.html]

展示页面如下：

![20190311125223359.png][]

选择对应的文件进行上传就会返回值：

![20190311125336115.png][]

而对于上传文件中，超过容量信息就会出现错误，所以在classpath路径下放置文件：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTI5OTQzMjA_size_16_color_FFFFFF_t_70][]

在里面设置：

spring.http.multipart.maxFileSize=200MB
    spring.http.multipart.maxRequestSize=200MB

上述含义是单次上传文件的大小设定为最大200MB,单次允许最大上传容量是200MB

[http_localhost_8080_upload.html]: http://localhost:8080/upload.html
[20190311125223359.png]: /images/20220310/8a0a56070d914ebba600bb79386ca0a2.png
[20190311125336115.png]: /images/20220310/0c1852d6043e4d7e96830282c82efa14.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTI5OTQzMjA_size_16_color_FFFFFF_t_70]: /images/20220310/cfa7d65615ef464c8b1010224978022a.png