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SpringBoot上传文件

SpringBoot文件上传
2023-09-11 14:22:10 时间

目录结构如下：

启动类：app.java

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class app {
    public static void main(String[] args) {
        SpringApplication.run(app.class,args);
    }
}

上传文件的Controller :FileUploadController.java

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;
import java.io.File;
import java.util.HashMap;
import java.util.Map;

@RestController
public class FileUploadController {
    @RequestMapping("/fileUploadController")  //fileUploadController在upload.html文件中定义
    public Map<String,Object> fileUpload(MultipartFile filename) throws Exception{
        Map<String,Object> map = new HashMap<>();
        System.out.println(filename.getOriginalFilename());
        filename.transferTo(new File("d:/"+filename.getOriginalFilename()));
        map.put("msg","upload file success");
        return map;
    }
}

Controller类样板 :HelloController .java

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import java.util.HashMap;
import java.util.Map;

@Controller
public class HelloController {
    @RequestMapping("/hello")
    @ResponseBody
    public Map<String,Object> say(){
        Map<String,Object> map = new HashMap<>();
        map.put("msg","hello");
        return map;
    }
}

启动app.java,浏览器输入地址 http://localhost:8080/hello ，结果如下：

upload.html内容如下：

<!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>

 查看静态文件

输入网址  http://localhost:8080/upload.html 可以访问如下，并上传文件到d盘

application.properties文件内容：

#设置单个上传文件的 大小
spring.http.multipart.maxFileSize=200MB
#设置一次请求上传文件的总容量
spring.http.multipart.maxRequestSize=200MB

 pom.xml文件如下：

spring-boot-starter-parent这个会加载所有spring所需的jar包

spring-boot-starter-web启动类

<?xml version="1.0" encoding="UTF-8"?>
<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>

    <groupId>org.example</groupId>
    <artifactId>SpringBootUpload</artifactId>
    <version>1.0-SNAPSHOT</version>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.6.4</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
<!--        <java.version>1.8</java.version>-->
    </properties>

    <dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    </dependencies>
</project>

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