使用Spring处理一个RESTful请求

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;

@SpringBootApplication
public 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

}

}