Spring Boot 之 HelloWorld 与多文件上传详解

时间 2019-11-06

标签 spring boot helloworld 文件上传详解栏目 Spring 繁體版

原文原文链接

0、用到的框架和组件以下：

Spring Boot 1.4.3.RELEASE
Spring 4.3.5.RELEASE
Thymeleaf
jQuery (webjars)
Maven
Embedded Tomcat 8.5.6
Google Chrome Browser (Network Inspect)
附：Spring MVC 请求流程图：

一、项目结构：

二、项目依赖：

Declares an extra jQuery webjar dependency, for Ajax requests in HTML form.html

pom.xmljava

<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>com.zhuanzhuan.data</groupId>
    <artifactId>HelloSpringBoot</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>HelloSpringBoot</name>
    <url>http://maven.apache.org</url>


    <!--&lt;!&ndash; Spring Boot 启动父依赖 &ndash;&gt;
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.2.RELEASE</version>
    </parent>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        &lt;!&ndash; Spring Boot web依赖 &ndash;&gt;
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        &lt;!&ndash; Junit &ndash;&gt;
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <version>1.5.2.RELEASE</version>
                <executions>
                    <execution>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>

        </plugins>
    </build>-->


    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.4.3.RELEASE</version>
    </parent>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>

        <!-- hot swapping, disable cache for template, enable live reload -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <optional>true</optional>
        </dependency>

        <dependency>
            <groupId>org.webjars</groupId>
            <artifactId>jquery</artifactId>
            <version>2.2.4</version>
        </dependency>

        <dependency>
            <groupId>com.google.guava</groupId>
            <artifactId>guava</artifactId>
            <version>13.0.1</version>
        </dependency>
        <dependency>
            <groupId>commons-httpclient</groupId>
            <artifactId>commons-httpclient</artifactId>
            <version>3.1</version>
            <scope>test</scope>
        </dependency>
        <!-- https://mvnrepository.com/artifact/commons-lang/commons-lang -->
        <dependency>
            <groupId>commons-lang</groupId>
            <artifactId>commons-lang</artifactId>
            <version>2.6</version>
            <scope>compile</scope>
        </dependency>


    </dependencies>

    <build>
        <plugins>
            <!-- Package as an executable jar/war -->
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

三、Controller层

HelloWorldController的代码以下：jquery

/**
 * Spring Boot HelloWorld案例
 *
 * Created by bysocket on 16/4/26.
 */
@RestController
public class HelloWorldController {
 
    @RequestMapping("/")
    public String sayHello() {
        return "Hello,World!";
    }
}

@RestController和@RequestMapping注解是来自SpringMVC的注解，它们不是SpringBoot的特定部分。web

1. @RestController：提供实现了REST API，能够服务JSON,XML或者其余。这里是以String的形式渲染出结果。ajax

2. @RequestMapping：提供路由信息，”/“路径的HTTP Request都会被映射到sayHello方法进行处理。spring

具体参考，世界上最好的文档来源自官方的《Spring Framework Document》apache

四、启动应用类

和第一段描述同样，开箱即用。以下面Application类：segmentfault

/**
 * Spring Boot应用启动类
 *
 * Created by bysocket on 16/4/26.
 */
@SpringBootApplication
public class Application {
 
    public static void main(String[] args) {
        SpringApplication.run(Application.class,args);
    }
}

1. @SpringBootApplication：Spring Boot 应用的标识api

2. Application很简单，一个main函数做为主入口。SpringApplication引导应用，并将Application自己做为参数传递给run方法。具体run方法会启动嵌入式的Tomcat并初始化Spring环境及其各Spring组件。spring-mvc

运行很简单，直接右键Run运行Application类。一样你也能够Debug Run。能够在控制台中看到：

Tomcat started on port(s): 8080 (http)
Started Application in 5.986 seconds (JVM running for 7.398)

而后访问 http://localhost:8080/ ,便可在页面中看到Spring Boot对你 say hello：

Hello,World！

五、spring boot 多文件上传代码

Download – spring-boot-file-upload-ajax-rest.zip (11 KB)

六、curl 测试文件上传

Test single file upload.
$ curl -F file=@"f:\\data.txt" http://localhost:8080/api/upload/
Successfully uploaded - data.txt

Test multiple file upload.
$ curl -F extraField="abc" -F files=@"f://data.txt" -F files=@"f://data2.txt" http://localhost:8080/api/upload/multi/
Successfully uploaded - data.txt , data2.txt

Test multiple file upload, maps to Model.
curl -F extraField="abc" -F files=@"f://data.txt" -F files=@"f://data2.txt"  http://localhost:8080/api/upload/multi/model
Successfully uploaded!