使用SBoot中封装Resttemplate时请接口报Could not extract response: no suitable HttpMessageConverter found处理方案,如下
package com.power.demo.restclient.config;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.module.SimpleModule;
import com.google.common.collect.Lists;
import com.power.demo.util.DateTimeSerializer;
import com.power.demo.util.DatetimeDeserializer;
import org.joda.time.DateTime;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.web.client.RestTemplateBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.stereotype.Component;
import org.springframework.web.client.RestTemplate;
import java.lang.reflect.Field;
import java.util.Arrays;
import java.util.List;
import java.util.Optional;
import java.util.stream.Collectors;
@Component
public class RestTemplateConfig {
// 启动的时候要注意,由于我们在服务中注入了RestTemplate,所以启动的时候需要实例化该类的一个实例
@Autowired
private RestTemplateBuilder builder;
@Autowired
private ObjectMapper objectMapper;
// 使用RestTemplateBuilder来实例化RestTemplate对象,spring默认已经注入了RestTemplateBuilder实例
@Bean
public RestTemplate restTemplate() {
RestTemplate restTemplate = builder.build();
//注册model,用于实现jackson joda time序列化和反序列化
SimpleModule module = new SimpleModule();
module.addSerializer(DateTime.class, new DateTimeSerializer());
module.addDeserializer(DateTime.class, new DatetimeDeserializer());
objectMapper.registerModule(module);
List<HttpMessageConverter<?>> messageConverters = Lists.newArrayList();
MappingJackson2HttpMessageConverter converter = new MappingJackson2HttpMessageConverter();
converter.setObjectMapper(objectMapper);
//不加会出现异常
//Could not extract response: no suitable HttpMessageConverter found for response type [class ]
MediaType[] mediaTypes = new MediaType[]{
MediaType.APPLICATION_JSON,
MediaType.APPLICATION_OCTET_STREAM,
MediaType.TEXT_HTML,
MediaType.TEXT_PLAIN,
MediaType.TEXT_XML,
MediaType.APPLICATION_STREAM_JSON,
MediaType.APPLICATION_ATOM_XML,
MediaType.APPLICATION_FORM_URLENCODED,
MediaType.APPLICATION_JSON_UTF8,
MediaType.APPLICATION_PDF,
};
converter.setSupportedMediaTypes(Arrays.asList(mediaTypes));
try {
//通过反射设置MessageConverters
Field field = restTemplate.getClass().getDeclaredField("messageConverters");
field.setAccessible(true);
List<HttpMessageConverter<?>> orgConverterList = (List<HttpMessageConverter<?>>) field.get(restTemplate);
Optional<HttpMessageConverter<?>> opConverter = orgConverterList.stream()
.filter(x -> x.getClass().getName().equalsIgnoreCase(MappingJackson2HttpMessageConverter.class
.getName()))
.findFirst();
if (opConverter.isPresent() == false) {
return restTemplate;
}
messageConverters.add(converter);//添加MappingJackson2HttpMessageConverter
//添加原有的剩余的HttpMessageConverter
List<HttpMessageConverter<?>> leftConverters = orgConverterList.stream()
.filter(x -> x.getClass().getName().equalsIgnoreCase(MappingJackson2HttpMessageConverter.class
.getName()) == false)
.collect(Collectors.toList());
messageConverters.addAll(leftConverters);
System.out.println(String.format("【HttpMessageConverter】原有数量:%s,重新构造后数量:%s"
, orgConverterList.size(), messageConverters.size()));
} catch (Exception e) {
e.printStackTrace();
}
restTemplate.setMessageConverters(messageConverters);
return restTemplate;
}
}
RestTemplateConfig