Spring Boot基础|文件上传配置|Spring Boot如何上传文件

来源：互联网发布：cpa做题软件编辑：程序博客网时间：2024/06/05 09:47

三国猿人会构建一个什么项目

使用一个简单的form表单上传文件，并且用Spring MVC接收上传的文件的应用

准备工作

15mins
IntelliJ IDEA
JDK 1.8 or later
Maven 3.0+

开始以下步骤

创建一个普通的maven项目
建立项目目录
配置pom.xml
创建上传接收文件的Controller
配置Spring MVC可接收文件上传
创建用于上传的form表单
配置启动类
运行项目

创建一个普通的maven项目

打开idea 选择 File->new->project->Maven（不要勾选web模块）->next。。。

建立项目目录

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└── src
    └── main
        └── java
            └── hello

配置pom.xml

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<?xmlversion="1.0"encoding="UTF-8"?>
<projectxmlns="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.springframework</groupId>
    <artifactId>gs-uploading-files</artifactId>
    <version>0.1.0</version>
 
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.3.1.RELEASE</version>
    </parent>
 
 
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
 
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
    </dependencies>
 
    <properties>
        <java.version>1.8</java.version>
    </properties>
 
    <repositories>
        <repository>
            <id>spring-releases</id>
            <name>SpringReleases</name>
            <url>https://repo.spring.io/libs-release</url>
        </repository>
    </repositories>
    <pluginRepositories>
        <pluginRepository>
            <id>spring-releases</id>
            <name>SpringReleases</name>
            <url>https://repo.spring.io/libs-release</url>
        </pluginRepository>
    </pluginRepositories>
</project>

创建上传接收文件的Controller

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src/main/java/hello/FileUploadController.java

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packagehello;
 
importjava.io.BufferedOutputStream;
importjava.io.File;
importjava.io.FileOutputStream;
 
importorg.springframework.stereotype.Controller;
importorg.springframework.web.bind.annotation.RequestMapping;
importorg.springframework.web.bind.annotation.RequestMethod;
importorg.springframework.web.bind.annotation.RequestParam;
importorg.springframework.web.bind.annotation.ResponseBody;
importorg.springframework.web.multipart.MultipartFile;
 
@Controller
publicclassFileUploadController{
 
    @RequestMapping(value="/upload",method=RequestMethod.GET)
    public@ResponseBodyStringprovideUploadInfo(){
        return"You can upload a file by posting to this same URL.";
    }
 
    @RequestMapping(value="/upload",method=RequestMethod.POST)
    public@ResponseBodyStringhandleFileUpload(@RequestParam("name")Stringname,
            @RequestParam("file")MultipartFilefile){
        if(!file.isEmpty()){
            try{
                byte[]bytes=file.getBytes();
                BufferedOutputStreamstream=
                        newBufferedOutputStream(newFileOutputStream(newFile(name)));
                stream.write(bytes);
                stream.close();
                return"You successfully uploaded "+name+"!";
            }catch(Exceptione){
                return"You failed to upload "+name+" => "+e.getMessage();
            }
        }else{
            return"You failed to upload "+name+" because the file was empty.";
        }
    }
 
}

配置Spring MVC可接收文件上传

新建

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src/main/resources/application.properties

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multipart.maxFileSize:10MB
multipart.maxRequestSize:10MB

创建用于上传的form表单

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src/main/resources/static/index.html

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<html>
<body>
<formmethod="POST"enctype="multipart/form-data"action="/upload">
Filetoupload:<inputtype="file"name="file"><br/>
              Name:<inputtype="text"name="name"><br/><br/>
              <inputtype="submit"value="Upload">点击上传文件!
</form>
</body>
</html>

配置启动类

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src/main/java/hello/Application.java

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packagehello;
 
importorg.springframework.boot.SpringApplication;
importorg.springframework.boot.autoconfigure.SpringBootApplication;
 
@SpringBootApplication
publicclassApplication{
 
    publicstaticvoidmain(String[]args){
        SpringApplication.run(Application.class,args);
    }
}

运行项目

右键运行 Appication.java 启动完毕后
打开浏览器访问 http://localhost:8080/
点击上传文件
上传成功后显示

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Yousuccessfullyuploaded<nameofyourfile>!

本文地址：Spring Boot基础|文件上传配置|Spring Boot如何上传文件

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