Spring Boot 之 HelloWorld 與多文件上傳詳解

時間 2019-11-06

標籤 spring boot helloworld 文件上傳詳解欄目 Spring 简体版

原文原文鏈接

0、用到的框架和組件以下：

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 請求流程圖：

一、項目結構：

二、項目依賴：

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 啓動父依賴 &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依賴 &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層

HelloWorldController的代碼以下：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註解是來自SpringMVC的註解，它們不是SpringBoot的特定部分。web

1. @RestController：提供實現了REST API，能夠服務JSON,XML或者其餘。這裏是以String的形式渲染出結果。ajax

2. @RequestMapping：提供路由信息，」/「路徑的HTTP Request都會被映射到sayHello方法進行處理。spring

具體參考，世界上最好的文檔來源自官方的《Spring Framework Document》apache

四、啓動應用類

和第一段描述同樣，開箱即用。以下面Application類：segmentfault

/**
 * Spring Boot應用啓動類
 *
 * 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 應用的標識api

2. Application很簡單，一個main函數做爲主入口。SpringApplication引導應用，並將Application自己做爲參數傳遞給run方法。具體run方法會啓動嵌入式的Tomcat並初始化Spring環境及其各Spring組件。spring-mvc

運行很簡單，直接右鍵Run運行Application類。一樣你也能夠Debug Run。能夠在控制檯中看到：

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

而後訪問 http://localhost:8080/ ,便可在頁面中看到Spring Boot對你 say hello：

Hello,World！

五、spring boot 多文件上傳代碼

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

六、curl 測試文件上傳

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!