使用Spring处理一个RESTful请求

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这里介绍的是用Spring来发起一个http请求，请求的对方响应一个json数据，这里主要介绍对这个请求的发起和处理的过程。

环境
java1.8
Ecplise
Maven3

下面是主要的代码，首先是Maven的配置文件：

<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.gaospot</groupId>  <artifactId>consum</artifactId>  <version>0.0.1-SNAPSHOT</version>  <parent>    <groupId>org.springframework.boot</groupId>    <artifactId>spring-boot-starter-parent</artifactId>    <version>1.3.5.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></project>

然后新建两个bean类，用来响应json请求。

package consum;import com.fasterxml.jackson.annotation.JsonIgnoreProperties;@JsonIgnoreProperties(ignoreUnknown = true) //只处理json格式的，不符合此格式的忽略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 +                '}';    }}

package consum;import com.fasterxml.jackson.annotation.JsonIgnoreProperties;@JsonIgnoreProperties(ignoreUnknown = true)public class Value {    private Long id;    private String quote;    public Value() {}    public Long getId() {        return id;    }    public String getQuote() {        return 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 + '\'' +                '}';    }}

在Application类中调用我们的请求类。

package consum;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.web.client.RestTemplate;@SpringBootApplicationpublic class Application implements CommandLineRunner {    private static final Logger log = LoggerFactory.getLogger(Application.class);    public static void main(String args[]) {        SpringApplication.run(Application.class);    }    @Override    public void run(String... arg0) throws Exception {        RestTemplate restTemplate = new RestTemplate();        Quote quote = restTemplate.getForObject("http://gturnquist-quoters.cfapps.io/api/random",                     Quote.class);   //restTemplate方法会使用jackson的json库将json转换为quote对象        log.info(quote.toString()); //将转换后的内容记录到日志，info级别的日志将在控制台输出    }}

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