springboot使用RESTful Web服务

╰+哭是因爲堅強的太久メ 2022-02-17 05:49 268阅读 0赞

## 文章来源：[https://spring.io/guides/gs/consuming-rest/][https_spring.io_guides_gs_consuming-rest] ##

### 一、创建简单的maven工程spring-boot-starter-parent，pom文件依赖如下： ###

<parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>2.1.4.RELEASE</version>
        </parent>
    
        <properties>
            <java.version>1.8</java.version>
        </properties>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-web</artifactId>
            </dependency>
            <dependency>
                <groupId>com.fasterxml.jackson.core</groupId>
                <artifactId>jackson-databind</artifactId>
            </dependency>
        </dependencies>
    
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
            </plugins>
        </build>

### 二、分别创建实体类 Value.java、Quote.java ###

package com.szcatic.entity;
    
    import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
    
    @JsonIgnoreProperties(ignoreUnknown = true)
    public class Value {
    
        private Long id;
        private String quote;
    
        public Value() {
        }
    
        public Long getId() {
            return this.id;
        }
    
        public String getQuote() {
            return this.quote;
        }
    
        public void setId(Long id) {
            this.id = id;
        }
    
        public void setQuote(String quote) {
            this.quote = quote;
        }
    
        @Override
        public String toString() {
            return "Value{" +
                    "id=" + id +
                    ", quote='" + quote + '\'' +
                    '}';
        }
    }

package com.szcatic.entity;
    
    import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
    
    @JsonIgnoreProperties(ignoreUnknown = true)
    public class Quote {
    
        private String type;
        private Value value;
    
        public Quote() {
        }
    
        public String getType() {
            return type;
        }
    
        public void setType(String type) {
            this.type = type;
        }
    
        public Value getValue() {
            return value;
        }
    
        public void setValue(Value value) {
            this.value = value;
        }
    
        @Override
        public String toString() {
            return "Quote{" +
                    "type='" + type + '\'' +
                    ", value=" + value +
                    '}';
        }
    }

### 三、创建引导类Application.java ###

package com.szcatic;
    
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    import org.springframework.boot.CommandLineRunner;
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.boot.web.client.RestTemplateBuilder;
    import org.springframework.context.annotation.Bean;
    import org.springframework.web.client.RestTemplate;
    
    import com.szcatic.entity.Quote;
    
    @SpringBootApplication
    public class Application {
    
    	private static final Logger log = LoggerFactory.getLogger(Application.class);
    
    	public static void main(String args[]) {
    		SpringApplication.run(Application.class);
    	}
    
    	@Bean
    	public RestTemplate restTemplate(RestTemplateBuilder builder) {
    		return builder.build();
    	}
    
    	@Bean
    	public CommandLineRunner run(RestTemplate restTemplate) throws Exception {
    		return args -> {
    			Quote quote = restTemplate.getForObject(
    					"http://gturnquist-quoters.cfapps.io/api/random", Quote.class);
    			log.info(quote.toString());
    		};
    	}
    }

### 四、查看请求[http://gturnquist-quoters.cfapps.io/api/random][http_gturnquist-quoters.cfapps.io_api_random]，结果如下： ###

{
        "type": "success",
        "value": {
            "id": 4,
            "quote": "Previous to Spring Boot, I remember XML hell, confusing set up, and many hours of frustration."
        }
    }

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3pzeDE4MjczMTE3MDAz_size_16_color_FFFFFF_t_70][]

### 五、启动引导类主程序，显示结果如下： ###

.   ____          _            __ _ _
     /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
    ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
     \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
      '  |____| .__|_| |_|_| |_\__, | / / / /
     =========|_|==============|___/=/_/_/_/
     :: Spring Boot ::        (v2.1.4.RELEASE)
    
    2019-04-18 22:29:44.965  INFO 11736 --- [           main] com.szcatic.Application                  : Starting Application on zsx with PID 11736 (F:\workspace4.11\spring-boot-web-service\target\classes started by admin in F:\workspace4.11\spring-boot-web-service)
    2019-04-18 22:29:44.968  INFO 11736 --- [           main] com.szcatic.Application                  : No active profile set, falling back to default profiles: default
    2019-04-18 22:29:45.522  INFO 11736 --- [           main] com.szcatic.Application                  : Started Application in 0.852 seconds (JVM running for 1.729)
    2019-04-18 22:29:47.483  INFO 11736 --- [           main] com.szcatic.Application                  : Quote{type='success', value=Value{id=11, quote='I have two hours today to build an app from scratch. @springboot to the rescue!'}}

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3pzeDE4MjczMTE3MDAz_size_16_color_FFFFFF_t_70 1][]

[https_spring.io_guides_gs_consuming-rest]: https://spring.io/guides/gs/consuming-rest/
[http_gturnquist-quoters.cfapps.io_api_random]: http://gturnquist-quoters.cfapps.io/api/random
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3pzeDE4MjczMTE3MDAz_size_16_color_FFFFFF_t_70]: /images/20220217/3bc47ebbb73848a69b40ee4b0b5388c6.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3pzeDE4MjczMTE3MDAz_size_16_color_FFFFFF_t_70 1]: /images/20220217/67ffc56f2d2d4df7aa84b3b01eec3365.png