RestTemplate初始化配置和FastJSON替换Jackson配置

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最新推荐文章于 2025-08-05 18:29:39 发布

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分类专栏： spring-boot

本文链接：https://blog.youkuaiyun.com/sinat_21184471/article/details/81481271

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本文介绍如何初始化配置RestTemplate，并详细讲解将默认的Jackson转换库替换为FastJSON的步骤，通过具体调用接口的例子展示如何使用JSONObect封装数据。

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package org.rabbit.consumer.config;

import java.nio.charset.StandardCharsets;
import java.util.List;

import org.apache.http.client.HttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.client.ClientHttpRequestFactory;
import org.springframework.http.client.HttpComponentsClientHttpRequestFactory;
import org.springframework.http.client.SimpleClientHttpRequestFactory;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.StringHttpMessageConverter;
import org.springframework.web.client.RestTemplate;

import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter4;

/**
 * @author <font color="red"><b>Gong.YiYang</b></font>
 * @Date 2018年7月12日
 * @Version 
 * @Description
 */
@Configuration
@ConditionalOnClass(value = {RestTemplate.class, HttpClient.class})
public class RestTemplateConfiguration {

	  @Value("${remote.maxTotalConnect}")
	  private int maxTotalConnect; //连接池的最大连接数默认为0
	  @Value("${remote.maxConnectPerRoute}")
	  private int maxConnectPerRoute; //单个主机的最大连接数
	  @Value("${remote.connectTimeout}")
	  private int connectTimeout; //连接超时默认2s
	  @Value("${remote.readTimeout}")
	  private int readTimeout; //读取超时默认30s

	  private ClientHttpRequestFactory createFactory() {
	    if (this.maxTotalConnect <= 0) {
	      SimpleClientHttpRequestFactory factory = new SimpleClientHttpRequestFactory();
	      factory.setConnectTimeout(this.connectTimeout);
	      factory.setReadTimeout(this.readTimeout);
	      return factory;
	    }
	    HttpClient httpClient = HttpClientBuilder.create().setMaxConnTotal(this.maxTotalConnect)
	        .setMaxConnPerRoute(this.maxConnectPerRoute).build();
	    HttpComponentsClientHttpRequestFactory factory = new HttpComponentsClientHttpRequestFactory(
	        httpClient);
	    factory.setConnectTimeout(this.connectTimeout);
	    factory.setReadTimeout(this.readTimeout);
	    return factory;
	  }

	  @Bean
	  @ConditionalOnMissingBean(RestTemplate.class)
	  public RestTemplate getRestTemplate() {
	    RestTemplate restTemplate = new RestTemplate(this.createFactory());
	    List<HttpMessageConverter<?>> converterList = restTemplate.getMessageConverters();

	    HttpMessageConverter<?> converterTarget = null;
	    for (HttpMessageConverter<?> item : converterList) {
	      if (StringHttpMessageConverter.class == item.getClass()) {
	        converterTarget = item;
	        break;
	      }
	    }
	    if (null != converterTarget) {
	      converterList.remove(converterTarget);
	    }
	    converterList.add(1, new StringHttpMessageConverter(StandardCharsets.UTF_8));

	    converterList.add(new FastJsonHttpMessageConverter4());
	    return restTemplate;
	  }
}

package org.rabbit.consumer.config;

import org.springframework.boot.autoconfigure.web.HttpMessageConverters;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import com.alibaba.fastjson.serializer.SerializerFeature;
import com.alibaba.fastjson.support.config.FastJsonConfig;
import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter4;

/**
 * @author <font color="red"><b>Gong.YiYang</b></font>
 * @Date 2018年7月12日
 * @Version 
 * @Description 把spring-boot默认的json解析器由jackson换为fastjson
 */
@Configuration
public class FastjsonConfiguration {

	 @Bean
	  public HttpMessageConverters fastjsonConverter() {
	    FastJsonConfig fastJsonConfig = new FastJsonConfig();
	    //自定义格式化输出
	    fastJsonConfig.setSerializerFeatures(SerializerFeature.PrettyFormat,
	        SerializerFeature.WriteNullStringAsEmpty, SerializerFeature.WriteNullNumberAsZero);

	    FastJsonHttpMessageConverter4 fastjson = new FastJsonHttpMessageConverter4();
	    fastjson.setFastJsonConfig(fastJsonConfig);
	    return new HttpMessageConverters(fastjson);
	  }
}

调用接口实例：封装数据使用JSONObect

JSONObject object = new JSONObject();
	        object.put("pic_id","水电费");
	        object.put("pic", img);
	        List<JSON> mapObject = new ArrayList<>();
	        mapObject.add(object);
	        JSONObject object1 = new JSONObject();
	        object1.put("id","1");
	        object1.put("data",mapObject);
	        HttpHeaders header = new HttpHeaders();
	        header.setContentType(MediaType.APPLICATION_JSON_UTF8);
			HttpEntity<JSONObject> httpEntity = new HttpEntity<>(object1, header);
	        //JSONObject postForObject = restTemplate.postForObject(url, object1, JSONObject.class);
	        ResponseEntity<String> postForEntity = restTemplate.postForEntity(url, httpEntity,String.class);
	        System.out.println(postForEntity.getBody());