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这里分类和汇总了欣宸的全部原创(含配套源码)：
https://github.com/zq2599/blog_demos
本篇概览
- 本文的实战是开发一个springboot应用，通过RestTemplate获取公共的远程api服务，将查询到的指定城市的天气信息返回给前端；
创建springboot应用
- 基于maven创建一个springboot应用，pom信息如下，注意添加了httpclient：
<?xml version="1.0" encoding="UTF-8"?>
<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>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.2.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.bolingcavalry</groupId>
<artifactId>weatherservice</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>weatherservice</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.7</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
package com.bolingcavalry.weatherservice;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class WeatherserviceApplication {
public static void main(String[] args) {
SpringApplication.run(WeatherserviceApplication.class, args);
}
}
创建配置类
- 创建一个配置类，这里注意要使用HttpComponentsClientHttpRequestFactory作为RestTemplate构造方法的入参，这样才能支持gzip压缩的response，否则得到的就是乱码：
package com.bolingcavalry.weatherservice;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.client.HttpComponentsClientHttpRequestFactory;
import org.springframework.http.converter.StringHttpMessageConverter;
import org.springframework.web.client.RestTemplate;
import java.nio.charset.StandardCharsets;
@Configuration
public class WeatherConfig {
@Bean
public RestTemplate restTemplate(){
RestTemplate restTemplate = new RestTemplate(new HttpComponentsClientHttpRequestFactory());
restTemplate.getMessageConverters().set(1, new StringHttpMessageConverter(StandardCharsets.UTF_8));
return restTemplate;
}
}
创建controller
- 创建一个controller来接收web请求，然后发起气象服务网站发起天气查询：
package com.bolingcavalry.weatherservice.controller;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.*;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;
@RestController
public class QueryWeather {
@Autowired
RestTemplate restTemplate;
@RequestMapping(value = "/get/{city}", method = RequestMethod.GET)
public String extern(@PathVariable("city") String city){
String apiURL = "http://wthrcdn.etouch.cn/weather_mini?city=" + city;
ResponseEntity<String> responseEntity = restTemplate.getForEntity(apiURL, String.class);
if(200==responseEntity.getStatusCodeValue()){
return responseEntity.getBody();
}else{
return "error with code : " + responseEntity.getStatusCodeValue();
}
}
}
验证
- 启动应用WeatherserviceApplication，假如服务器IP地址是172.30.192.1，浏览器响应如下图，地址是：http://172.30.192.1:8080/get/深圳
源码下载
- 接下来的实战是编写Flink应用的源码，您可以选择直接从GitHub下载这个工程的源码，地址和链接信息如下表所示：
- 这个git项目中有多个文件夹，本章源码在flinkkafkademo这个文件夹下，如下图红框所示：
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