002-04-RestTemplate 使用常见问题

一、使用

　　同前三节：ClientGetGoodsByGoodsIdResponse response = restTemplate.postForObject(svcUrl, request, Response.class);

二、问题汇总

1、no suitable HttpMessageConverter found for request type异常

这个问题通常会出现在postForObject中传入对象进行调用的时候。

分析RestTemplate源码，在HttpEntityRequestCallback类的doWithRequest方法中，如果messageConverters（这个字段后面会继续提及）列表字段循环处理的过程中没有满足return跳出的逻辑（也就是没有匹配的HttpMessageConverter），则抛出上述异常：

@Override
        @SuppressWarnings("unchecked")
        public void doWithRequest(ClientHttpRequest httpRequest) throws IOException {
            super.doWithRequest(httpRequest);
            Object requestBody = this.requestEntity.getBody();
            if (requestBody == null) {
                HttpHeaders httpHeaders = httpRequest.getHeaders();
                HttpHeaders requestHeaders = this.requestEntity.getHeaders();
                if (!requestHeaders.isEmpty()) {
                    for (Map.Entry<String, List<String>> entry : requestHeaders.entrySet()) {
                        httpHeaders.put(entry.getKey(), new LinkedList<>(entry.getValue()));
                    }
                }
                if (httpHeaders.getContentLength() < 0) {
                    httpHeaders.setContentLength(0L);
                }
            }
            else {
                Class<?> requestBodyClass = requestBody.getClass();
                Type requestBodyType = (this.requestEntity instanceof RequestEntity ?
                        ((RequestEntity<?>)this.requestEntity).getType() : requestBodyClass);
                HttpHeaders httpHeaders = httpRequest.getHeaders();
                HttpHeaders requestHeaders = this.requestEntity.getHeaders();
                MediaType requestContentType = requestHeaders.getContentType();
                for (HttpMessageConverter<?> messageConverter : getMessageConverters()) {
                    if (messageConverter instanceof GenericHttpMessageConverter) {
                        GenericHttpMessageConverter<Object> genericConverter =
                                (GenericHttpMessageConverter<Object>) messageConverter;
                        if (genericConverter.canWrite(requestBodyType, requestBodyClass, requestContentType)) {
                            if (!requestHeaders.isEmpty()) {
                                for (Map.Entry<String, List<String>> entry : requestHeaders.entrySet()) {
                                    httpHeaders.put(entry.getKey(), new LinkedList<>(entry.getValue()));
                                }
                            }
                            if (logger.isDebugEnabled()) {
                                if (requestContentType != null) {
                                    logger.debug("Writing [" + requestBody + "] as "" + requestContentType +
                                            "" using [" + messageConverter + "]");
                                }
                                else {
                                    logger.debug("Writing [" + requestBody + "] using [" + messageConverter + "]");
                                }

                            }
                            genericConverter.write(requestBody, requestBodyType, requestContentType, httpRequest);
                            return;
                        }
                    }
                    else if (messageConverter.canWrite(requestBodyClass, requestContentType)) {
                        if (!requestHeaders.isEmpty()) {
                            for (Map.Entry<String, List<String>> entry : requestHeaders.entrySet()) {
                                httpHeaders.put(entry.getKey(), new LinkedList<>(entry.getValue()));
                            }
                        }
                        if (logger.isDebugEnabled()) {
                            if (requestContentType != null) {
                                logger.debug("Writing [" + requestBody + "] as "" + requestContentType +
                                        "" using [" + messageConverter + "]");
                            }
                            else {
                                logger.debug("Writing [" + requestBody + "] using [" + messageConverter + "]");
                            }

                        }
                        ((HttpMessageConverter<Object>) messageConverter).write(
                                requestBody, requestContentType, httpRequest);
                        return;
                    }
                }
                String message = "Could not write request: no suitable HttpMessageConverter found for request type [" +
                        requestBodyClass.getName() + "]";
                if (requestContentType != null) {
                    message += " and content type [" + requestContentType + "]";
                }
                throw new RestClientException(message);
            }
        }

HttpEntityRequestCallback.doWithRequest

最简单的解决方案是，可以通过包装http请求头，并将请求对象序列化成字符串的形式传参，参考示例代码如下：

    /*
     * Post请求调用
     * */
    public static String postForObject(RestTemplate restTemplate, String url, Object params) {
        HttpHeaders headers = new HttpHeaders();
        MediaType type = MediaType.parseMediaType("application/json; charset=UTF-8");
        headers.setContentType(type);
        headers.add("Accept", MediaType.APPLICATION_JSON.toString());

        String json = JSON.toJSONString(params);

        HttpEntity<String> formEntity = new HttpEntity<String>(json, headers);

        String result = restTemplate.postForObject(url, formEntity, String.class);

        return result;
    }

如果我们还想直接返回对象，直接反序列化返回的字符串即可：

    /*
     * Post请求调用
     * */
    public static <T> T postForObject(RestTemplate restTemplate, String url, Object params, Class<T> clazz) {
        T response = null;

        String respStr = postForObject(restTemplate, url, params);

        response = JSON.parseObject(respStr, clazz);

        return response;
    }

其中，序列化和反序列化工具比较多，常用的比如fastjson、jackson和gson。

2、no suitable HttpMessageConverter found for response type异常

和发起请求发生异常一样，处理应答的时候也会有问题。

StackOverflow上有人问过相同的问题，根本原因是HTTP消息转换器HttpMessageConverter缺少MIME Type，也就是说HTTP在把输出结果传送到客户端的时候，客户端必须启动适当的应用程序来处理这个输出文档，这可以通过多种MIME（多功能网际邮件扩充协议）Type来完成。

对于服务端应答，很多HttpMessageConverter默认支持的媒体类型（MIMEType）都不同。StringHttpMessageConverter默认支持的则是MediaType.TEXT_PLAIN，SourceHttpMessageConverter默认支持的则是MediaType.TEXT_XML，FormHttpMessageConverter默认支持的是MediaType.APPLICATION_FORM_URLENCODED和MediaType.MULTIPART_FORM_DATA，在REST服务中，我们用到的最多的还是MappingJackson2HttpMessageConverter，这是一个比较通用的转化器（继承自GenericHttpMessageConverter接口），根据分析，它默认支持的MIMEType为MediaType.APPLICATION_JSON：

    /**
     * Construct a new {@link MappingJackson2HttpMessageConverter} with a custom {@link ObjectMapper}.
     * You can use {@link Jackson2ObjectMapperBuilder} to build it easily.
     * @see Jackson2ObjectMapperBuilder#json()
     */
    public MappingJackson2HttpMessageConverter(ObjectMapper objectMapper) {
        super(objectMapper, MediaType.APPLICATION_JSON, new MediaType("application", "*+json"));
    }

但是有些应用接口默认的应答MIMEType不是application/json，比如我们调用一个外部天气预报接口，如果使用RestTemplate的默认配置，直接返回一个字符串应答是没有问题的：

String url = "http://wthrcdn.etouch.cn/weather_mini?city=上海";
String result = restTemplate.getForObject(url, String.class);
ClientWeatherResultVO vo = SerializeUtil.DeSerialize(result, ClientWeatherResultVO.class);

但是，如果我们想直接返回一个实体对象：

String url = "http://wthrcdn.etouch.cn/weather_mini?city=上海";

ClientWeatherResultVO weatherResultVO = restTemplate.getForObject(url, ClientWeatherResultVO.class);

则直接报异常：
Could not extract response: no suitable HttpMessageConverter found for response type [class ]
and content type [application/octet-stream]

很多人碰到过这个问题，首次碰到估计大多都比较懵吧，很多接口都是json或者xml或者plain text格式返回的，什么是application/octet-stream？

查看RestTemplate源代码，一路跟踪下去会发现HttpMessageConverterExtractor类的extractData方法有个解析应答及反序列化逻辑，如果不成功，抛出的异常信息和上述一致：

@Override
    @SuppressWarnings({"unchecked", "rawtypes", "resource"})
    public T extractData(ClientHttpResponse response) throws IOException {
        MessageBodyClientHttpResponseWrapper responseWrapper = new MessageBodyClientHttpResponseWrapper(response);
        if (!responseWrapper.hasMessageBody() || responseWrapper.hasEmptyMessageBody()) {
            return null;
        }
        MediaType contentType = getContentType(responseWrapper);

        try {
            for (HttpMessageConverter<?> messageConverter : this.messageConverters) {
                if (messageConverter instanceof GenericHttpMessageConverter) {
                    GenericHttpMessageConverter<?> genericMessageConverter =
                            (GenericHttpMessageConverter<?>) messageConverter;
                    if (genericMessageConverter.canRead(this.responseType, null, contentType)) {
                        if (logger.isDebugEnabled()) {
                            logger.debug("Reading [" + this.responseType + "] as "" +
                                    contentType + "" using [" + messageConverter + "]");
                        }
                        return (T) genericMessageConverter.read(this.responseType, null, responseWrapper);
                    }
                }
                if (this.responseClass != null) {
                    if (messageConverter.canRead(this.responseClass, contentType)) {
                        if (logger.isDebugEnabled()) {
                            logger.debug("Reading [" + this.responseClass.getName() + "] as "" +
                                    contentType + "" using [" + messageConverter + "]");
                        }
                        return (T) messageConverter.read((Class) this.responseClass, responseWrapper);
                    }
                }
            }
        }
        catch (IOException | HttpMessageNotReadableException ex) {
            throw new RestClientException("Error while extracting response for type [" +
                    this.responseType + "] and content type [" + contentType + "]", ex);
        }

        throw new RestClientException("Could not extract response: no suitable HttpMessageConverter found " +
                "for response type [" + this.responseType + "] and content type [" + contentType + "]");
    }

HttpMessageConverterExtractor.extractData

StackOverflow上的解决的示例代码可以接受，但是并不准确，常见的MIMEType都应该加进去，贴一下我认为正确的代码：

package com.power.demo.restclient.config;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.common.collect.Lists;
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.*;
import org.springframework.http.converter.cbor.MappingJackson2CborHttpMessageConverter;
import org.springframework.http.converter.feed.AtomFeedHttpMessageConverter;
import org.springframework.http.converter.feed.RssChannelHttpMessageConverter;
import org.springframework.http.converter.json.GsonHttpMessageConverter;
import org.springframework.http.converter.json.JsonbHttpMessageConverter;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.http.converter.smile.MappingJackson2SmileHttpMessageConverter;
import org.springframework.http.converter.support.AllEncompassingFormHttpMessageConverter;
import org.springframework.http.converter.xml.Jaxb2RootElementHttpMessageConverter;
import org.springframework.http.converter.xml.MappingJackson2XmlHttpMessageConverter;
import org.springframework.http.converter.xml.SourceHttpMessageConverter;
import org.springframework.stereotype.Component;
import org.springframework.util.ClassUtils;
import org.springframework.web.client.RestTemplate;

import java.util.Arrays;
import java.util.List;

@Component
public class RestTemplateConfig {

    private static final boolean romePresent = ClassUtils.isPresent("com.rometools.rome.feed.WireFeed", RestTemplate
            .class.getClassLoader());
    private static final boolean jaxb2Present = ClassUtils.isPresent("javax.xml.bind.Binder", RestTemplate.class.getClassLoader());
    private static final boolean jackson2Present = ClassUtils.isPresent("com.fasterxml.jackson.databind.ObjectMapper", RestTemplate.class.getClassLoader()) && ClassUtils.isPresent("com.fasterxml.jackson.core.JsonGenerator", RestTemplate.class.getClassLoader());
    private static final boolean jackson2XmlPresent = ClassUtils.isPresent("com.fasterxml.jackson.dataformat.xml.XmlMapper", RestTemplate.class.getClassLoader());
    private static final boolean jackson2SmilePresent = ClassUtils.isPresent("com.fasterxml.jackson.dataformat.smile.SmileFactory", RestTemplate.class.getClassLoader());
    private static final boolean jackson2CborPresent = ClassUtils.isPresent("com.fasterxml.jackson.dataformat.cbor.CBORFactory", RestTemplate.class.getClassLoader());
    private static final boolean gsonPresent = ClassUtils.isPresent("com.google.gson.Gson", RestTemplate.class.getClassLoader());
    private static final boolean jsonbPresent = ClassUtils.isPresent("javax.json.bind.Jsonb", RestTemplate.class.getClassLoader());

    // 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();

        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.APPLICATION_JSON_UTF8,
                MediaType.TEXT_HTML,
                MediaType.TEXT_PLAIN,
                MediaType.TEXT_XML,
                MediaType.APPLICATION_STREAM_JSON,
                MediaType.APPLICATION_ATOM_XML,
                MediaType.APPLICATION_FORM_URLENCODED,
                MediaType.APPLICATION_PDF,
        };

        converter.setSupportedMediaTypes(Arrays.asList(mediaTypes));

        //messageConverters.add(converter);
        if (jackson2Present) {
            messageConverters.add(converter);
        } else if (gsonPresent) {
            messageConverters.add(new GsonHttpMessageConverter());
        } else if (jsonbPresent) {
            messageConverters.add(new JsonbHttpMessageConverter());
        }

        messageConverters.add(new FormHttpMessageConverter());

        messageConverters.add(new ByteArrayHttpMessageConverter());
        messageConverters.add(new StringHttpMessageConverter());
        messageConverters.add(new ResourceHttpMessageConverter(false));
        messageConverters.add(new SourceHttpMessageConverter());
        messageConverters.add(new AllEncompassingFormHttpMessageConverter());
        if (romePresent) {
            messageConverters.add(new AtomFeedHttpMessageConverter());
            messageConverters.add(new RssChannelHttpMessageConverter());
        }

        if (jackson2XmlPresent) {
            messageConverters.add(new MappingJackson2XmlHttpMessageConverter());
        } else if (jaxb2Present) {
            messageConverters.add(new Jaxb2RootElementHttpMessageConverter());
        }


        if (jackson2SmilePresent) {
            messageConverters.add(new MappingJackson2SmileHttpMessageConverter());
        }

        if (jackson2CborPresent) {
            messageConverters.add(new MappingJackson2CborHttpMessageConverter());
        }

        restTemplate.setMessageConverters(messageConverters);

        return restTemplate;
    }

}

RestTemplateConfig

看到上面的代码，再对比一下RestTemplate内部实现，就知道我参考了RestTemplate的源码，有洁癖的人可能会说这一坨代码有点啰嗦，上面那一堆static final的变量和messageConverters填充数据方法，暴露了RestTemplate的实现，如果RestTemplate修改了，这里也要改，非常不友好，而且看上去一点也不OO。

经过分析，RestTemplateBuilder.build()构造了RestTemplate对象，只要将内部MappingJackson2HttpMessageConverter修改一下支持的MediaType即可，RestTemplate的messageConverters字段虽然是private final的，我们依然可以通过反射修改之，改进后的代码如下：

package com.power.demo.restclient.config;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.common.collect.Lists;
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();

        List<HttpMessageConverter<?>> messageConverters = Lists.newArrayList();
        MappingJackson2HttpMessageConverter converter = new MappingJackson2HttpMessageConverter();
        converter.setObjectMapper(objectMapper);

        //不加可能会出现异常
        //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

除了一个messageConverters字段，看上去我们不再关心RestTemplate那些外部依赖包和内部构造过程，果然干净简洁好维护了很多。

3、乱码问题

这个也是一个非常经典的问题。解决方案非常简单，找到HttpMessageConverter，看看默认支持的Charset。AbstractJackson2HttpMessageConverter是很多HttpMessageConverter的基类，默认编码为UTF-8：

public abstract class AbstractJackson2HttpMessageConverter extends AbstractGenericHttpMessageConverter<Object> {

    public static final Charset DEFAULT_CHARSET = StandardCharsets.UTF_8;

}

而StringHttpMessageConverter比较特殊，有人反馈过发生乱码问题由它默认支持的编码ISO-8859-1引起：

/**
 * Implementation of {@link HttpMessageConverter} that can read and write strings.
 *
 * <p>By default, this converter supports all media types ({@code &#42;&#47;&#42;}),
 * and writes with a {@code Content-Type} of {@code text/plain}. This can be overridden
 * by setting the {@link #setSupportedMediaTypes supportedMediaTypes} property.
 *
 * @author Arjen Poutsma
 * @author Juergen Hoeller
 * @since 3.0
 */
public class StringHttpMessageConverter extends AbstractHttpMessageConverter<String> {

    public static final Charset DEFAULT_CHARSET = StandardCharsets.ISO_8859_1;

    /**
     * A default constructor that uses {@code "ISO-8859-1"} as the default charset.
     * @see #StringHttpMessageConverter(Charset)
     */
    public StringHttpMessageConverter() {
        this(DEFAULT_CHARSET);
    }

}

如果在使用过程中发生乱码，我们可以通过方法设置HttpMessageConverter支持的编码，常用的有UTF-8、GBK等。

4、反序列化异常

这是开发过程中容易碰到的又一个问题。因为Java的开源框架和工具类非常之多，而且版本更迭频繁，所以经常发生一些意想不到的坑。

以joda time为例，joda time是流行的java时间和日期框架，但是如果你的接口对外暴露joda time的类型，比如DateTime，那么接口调用方（同构和异构系统）可能会碰到序列化难题，反序列化时甚至直接抛出如下异常：

org.springframework.http.converter.HttpMessageConversionException: Type definition error: [simple type, class org.joda.time.Chronology]; nested exception is com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of `org.joda.time.Chronology` (no Creators, like default construct, exist): abstract types either need to be mapped to concrete types, have custom deserializer, or contain additional type information
 at [Source: (PushbackInputStream);

我在前厂就碰到过，可以参考这里，后来为了调用方便，改回直接暴露Java的Date类型。

当然解决的方案不止这一种，可以使用jackson支持自定义类的序列化和反序列化的方式。在精度要求不是很高的系统里，实现简单的DateTime自定义序列化：

package com.power.demo.util;


import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;
import org.joda.time.DateTime;
import org.joda.time.format.DateTimeFormat;
import org.joda.time.format.DateTimeFormatter;

import java.io.IOException;

/**
 * 在默认情况下，jackson会将joda time序列化为较为复杂的形式，不利于阅读，并且对象较大。
 * <p>
 * JodaTime 序列化的时候可以将datetime序列化为字符串，更容易读
 **/
public class DateTimeSerializer extends JsonSerializer<DateTime> {

    private static DateTimeFormatter dateFormatter = DateTimeFormat.forPattern("yyyy-MM-dd HH:mm:ss");

    @Override
    public void serialize(DateTime value, JsonGenerator jgen, SerializerProvider provider) throws IOException, JsonProcessingException {
        jgen.writeString(value.toString(dateFormatter));
    }
}

以及DateTime反序列化：

package com.power.demo.util;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonNode;
import org.joda.time.DateTime;
import org.joda.time.format.DateTimeFormat;
import org.joda.time.format.DateTimeFormatter;

import java.io.IOException;

/**
 * JodaTime 反序列化将字符串转化为datetime
 **/
public class DatetimeDeserializer extends JsonDeserializer<DateTime> {

    private static DateTimeFormatter dateFormatter = DateTimeFormat.forPattern("yyyy-MM-dd HH:mm:ss");

    @Override
    public DateTime deserialize(JsonParser jp, DeserializationContext context) throws IOException, JsonProcessingException {
        JsonNode node = jp.getCodec().readTree(jp);
        String s = node.asText();
        DateTime parse = DateTime.parse(s, dateFormatter);
        return parse;
    }
}

最后可以在RestTemplateConfig类中对常见调用问题进行汇总处理，可以参考如下：

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;
    }

}

目前良好地解决了RestTemplate常见调用问题，而且不需要你写RestTemplate帮助工具类了。

原文地址：https://www.cnblogs.com/jeffwongishandsome/archive/2018/05/17/8995562.html