自定义SpringBoot起步依赖stater

 

 

自定义SpringBoot起步依赖stater

 

 

HttpClientProperties 

package com.mooc1.house.autoconfig;

import org.springframework.boot.context.properties.ConfigurationProperties;

@ConfigurationProperties(prefix="spring.httpclient")
public class HttpClientProperties {
	
	private Integer connectTimeOut = 1000;
	private Integer socketTimeOut = 10000;

	private String agent = "agent";
	private Integer maxConnPerRoute = 10;
	private Integer maxConnTotaol   = 50;


	public Integer getConnectTimeOut() {
		return connectTimeOut;
	}
	public void setConnectTimeOut(Integer connectTimeOut) {
		this.connectTimeOut = connectTimeOut;
	}
	public Integer getSocketTimeOut() {
		return socketTimeOut;
	}
	public void setSocketTimeOut(Integer socketTimeOut) {
		this.socketTimeOut = socketTimeOut;
	}
	public String getAgent() {
		return agent;
	}
	public void setAgent(String agent) {
		this.agent = agent;
	}
	public Integer getMaxConnPerRoute() {
		return maxConnPerRoute;
	}
	public void setMaxConnPerRoute(Integer maxConnPerRoute) {
		this.maxConnPerRoute = maxConnPerRoute;
	}
	public Integer getMaxConnTotaol() {
		return maxConnTotaol;
	}
	public void setMaxConnTotaol(Integer maxConnTotaol) {
		this.maxConnTotaol = maxConnTotaol;
	}
	
}

说明：

    1）这里相当于配置文件中定义的配置；

    2）每个属性相当于配置文件中spring.httpclient.属性名=对应值；

   

 

 

HttpClientAutoConfiguration 

package com.mooc1.house.autoconfig;

import org.apache.http.client.HttpClient;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.impl.client.HttpClientBuilder;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
@ConditionalOnClass({HttpClient.class})
@EnableConfigurationProperties(HttpClientProperties.class)
public class HttpClientAutoConfiguration {

	private final HttpClientProperties properties;
	
	public HttpClientAutoConfiguration(HttpClientProperties properties){
		this.properties = properties;
	}
	
	/**
	 * httpclient bean 的定义
	 * 有三种方式都可以让HttpClientAutoConfiguration这个自动配置生效
	 * 1.通过将自动配置所在package成为注解了@SpringBootApplication启动类的子package
	 * 2.通过定义META-INF/spring.factories文件，里面添加EnableAutoConfiguration与自动配置的映射关系
	 * 3.通过在启动类中添加注解EnableHttpClient,EnableHttpClient要@Import(HttpClientAutoConfiguration.class)
	 * @return
	 */
	@Bean
	@ConditionalOnMissingBean(HttpClient.class)
	public HttpClient httpClient(){
	   //构建requestConfig
		RequestConfig requestConfig = RequestConfig.custom()
		        .setConnectTimeout(properties.getConnectTimeOut())				// 设置连接超时时间，默认1秒
				.setSocketTimeout(properties.getSocketTimeOut()).build();		// 设置读超时时间，默认10秒

		HttpClient client = HttpClientBuilder.create()
		         .setDefaultRequestConfig(requestConfig) 						// 设置requestConfig
		         .setUserAgent(properties.getAgent())							// 设置User-Agent
				 .setMaxConnPerRoute(properties.getMaxConnPerRoute())			// 设置一个远端IP最大的连接数
				 .setMaxConnTotal(properties.getMaxConnTotaol())				// 设置总的连接数
//				 .setConnectionReuseStrategy(new NoConnectionReuseStrategy())	// 不重用连接，默认是重用，建议保持默认开启连接池，节省建立连接开销
				 .build();
		return client;
	}
}

说明：

    1）@Configuration：从Spring3.0，@Configuration用于定义配置类，可替换xml配置文件，被注解的类内部包含有一个或多个被@Bean注解的方法，这些方法将会被AnnotationConfigApplicationContext或AnnotationConfigWebApplicationContext类进行扫描，并用于构建bean定义，初始化Spring容器。

    2）@ConditionalOnClass：参考https://blog.csdn.net/andy_zhang2007/article/details/81284875

    3）@EnableConfigurationProperties注解的作用是：使使用 @ConfigurationProperties 注解的类生效。

 

 

 

 

EnableHttpClient 

package com.mooc1.house.autoconfig;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

import org.springframework.context.annotation.Import;

@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Import(HttpClientAutoConfiguration.class)
public @interface EnableHttpClient {

}

说明：

    1）@Target(ElementType.TYPE)   // 接口、类、枚举、注解

    2）@Retention(RetentionPolicy.RUNTIME) // 注解不仅被保存到class文件中，jvm加载class文件之后，仍然存在；

    3）@Import注解就是之前xml配置中的import标签，可以用于依赖第三方包中bean的配置和加载

 

 

 

启动类

package com.mooc.house;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.scheduling.annotation.EnableAsync;

import com.mooc1.house.autoconfig.EnableHttpClient;

@SpringBootApplication
@EnableHttpClient
@EnableAsync
public class HouseApplication {
	public static void main(String[] args) {
		SpringApplication.run(HouseApplication.class, args);
	}
}

说明：

    1）通过在启动类中添加注解EnableHttpClient,EnableHttpClient要@Import(HttpClientAutoConfiguration.class)；

 

 

 

测试类-HouseApplicationTest

 

package com.mooc.house;

import java.io.IOException;

import org.apache.http.ParseException;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.util.EntityUtils;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;


@RunWith(SpringRunner.class)
@SpringBootTest
public class HouseApplicationTest {


  /**
   * 检测我们编写的自动配置HttpClientAutoConfiguration有没有生效
   */
  @Autowired
  private HttpClient httpClient;
  
  /**
     * httpclient bean 的定义
     * 有三种方式都可以让HttpClientAutoConfiguration这个自动配置生效
     * 1.通过将自动配置所在package成为注解了@SpringBootApplication启动类的子package
     * 2.通过定义META-INF/spring.factories文件，里面添加EnableAutoConfiguration与自动配置的映射关系
     * 3.通过在启动类中添加注解EnableHttpClient,EnableHttpClient要@Import(HttpClientAutoConfiguration.class)
     * @return
     */
  @Test
  public void testHttclient() throws ParseException, ClientProtocolException, IOException{
    //访问百度，输出百度网页
    System.out.println(EntityUtils.toString(httpClient.execute(new HttpGet("http://www.hao123.com")).getEntity()));
  }
  

}

说明：

    1）检测我们编写的自动配置HttpClientAutoConfiguration有没有生效

 

 

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