springboot restTemplate 中文乱码

我不是女神ヾ 2023-02-21 11:53 8阅读 0赞

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### springboot restTemplate 中文乱码 ###

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**示例**

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**config 层**

**WebConfig**

@Configuration
    public class WebConfig {
    
        @Bean
        public RestTemplate initRestTemplate(){
            return new RestTemplate();
        }
    }

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**controller 层**

**HelloController**

@RestController
    public class HelloController {
    
        @Resource
        private RestTemplate restTemplate;
    
        @RequestMapping("/hello")
        public String test(){
            return restTemplate.getForObject("http://www.baidu.com",String.class);
        }
    }

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**使用测试**

**localhost:8080/hello**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzMTYyNQ_size_16_color_FFFFFF_t_70][]

**使用默认的restTemplate加载百度首页，出现中文乱码**

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**中文乱码解决**

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**默认的消息转换器**

**RestTemplate**

public class RestTemplate extends InterceptingHttpAccessor implements RestOperations {
        private static final boolean romePresent;
        private static final boolean jaxb2Present;
        private static final boolean jackson2Present;
        private static final boolean jackson2XmlPresent;
        private static final boolean jackson2SmilePresent;
        private static final boolean jackson2CborPresent;
        private static final boolean gsonPresent;
        private static final boolean jsonbPresent;
        private final List<HttpMessageConverter<?>> messageConverters;
        private ResponseErrorHandler errorHandler;
        private UriTemplateHandler uriTemplateHandler;
        private final ResponseExtractor<HttpHeaders> headersExtractor;
    
    
    
        public RestTemplate() {       //默认构造函数
            this.messageConverters = new ArrayList();
            this.errorHandler = new DefaultResponseErrorHandler();
            this.headersExtractor = new RestTemplate.HeadersExtractor();
            this.messageConverters.add(new ByteArrayHttpMessageConverter());
            this.messageConverters.add(new StringHttpMessageConverter());
            this.messageConverters.add(new ResourceHttpMessageConverter(false));
    
            try {
                this.messageConverters.add(new SourceHttpMessageConverter());
            } catch (Error var2) {
            }
    
            this.messageConverters.add(new AllEncompassingFormHttpMessageConverter());
            if (romePresent) {
                this.messageConverters.add(new AtomFeedHttpMessageConverter());
                this.messageConverters.add(new RssChannelHttpMessageConverter());
            }
    
            if (jackson2XmlPresent) {
                this.messageConverters.add(new MappingJackson2XmlHttpMessageConverter());
            } else if (jaxb2Present) {
                this.messageConverters.add(new Jaxb2RootElementHttpMessageConverter());
            }
    
            if (jackson2Present) {
                this.messageConverters.add(new MappingJackson2HttpMessageConverter());
            } else if (gsonPresent) {
                this.messageConverters.add(new GsonHttpMessageConverter());
            } else if (jsonbPresent) {
                this.messageConverters.add(new JsonbHttpMessageConverter());
            }
    
            if (jackson2SmilePresent) {
                this.messageConverters.add(new MappingJackson2SmileHttpMessageConverter());
            }
    
            if (jackson2CborPresent) {
                this.messageConverters.add(new MappingJackson2CborHttpMessageConverter());
            }
    
            this.uriTemplateHandler = initUriTemplateHandler();
        }

**默认添加后的消息转换器**

![2020063014380388.png][]

**StringHttpMessageConverter：默认使用的字符集为 iso-8859-1**

public class StringHttpMessageConverter extends AbstractHttpMessageConverter<String> {
        public static final Charset DEFAULT_CHARSET;
        @Nullable
        private volatile List<Charset> availableCharsets;
        private boolean writeAcceptCharset;
    
        public StringHttpMessageConverter() {
            this(DEFAULT_CHARSET);
        }
    
        public StringHttpMessageConverter(Charset defaultCharset) {
            super(defaultCharset, new MediaType[]{MediaType.TEXT_PLAIN, MediaType.ALL});
            this.writeAcceptCharset = false;
        }
    
        public void setWriteAcceptCharset(boolean writeAcceptCharset) {
            this.writeAcceptCharset = writeAcceptCharset;
        }
    
        public boolean supports(Class<?> clazz) {
            return String.class == clazz;
        }
    
        protected String readInternal(Class<? extends String> clazz, HttpInputMessage inputMessage) throws IOException {
            Charset charset = this.getContentTypeCharset(inputMessage.getHeaders().getContentType());
            return StreamUtils.copyToString(inputMessage.getBody(), charset);
        }
    
        protected Long getContentLength(String str, @Nullable MediaType contentType) {
            Charset charset = this.getContentTypeCharset(contentType);
            return (long)str.getBytes(charset).length;
        }
    
        protected void addDefaultHeaders(HttpHeaders headers, String s, @Nullable MediaType type) throws IOException {
            if (headers.getContentType() == null && type != null && type.isConcrete() && type.isCompatibleWith(MediaType.APPLICATION_JSON)) {
                headers.setContentType(type);
            }
    
            super.addDefaultHeaders(headers, s, type);
        }
    
        protected void writeInternal(String str, HttpOutputMessage outputMessage) throws IOException {
            HttpHeaders headers = outputMessage.getHeaders();
            if (this.writeAcceptCharset && headers.get("Accept-Charset") == null) {
                headers.setAcceptCharset(this.getAcceptedCharsets());
            }
    
            Charset charset = this.getContentTypeCharset(headers.getContentType());
            StreamUtils.copy(str, charset, outputMessage.getBody());
        }
    
        protected List<Charset> getAcceptedCharsets() {
            List<Charset> charsets = this.availableCharsets;
            if (charsets == null) {
                charsets = new ArrayList(Charset.availableCharsets().values());
                this.availableCharsets = (List)charsets;
            }
    
            return (List)charsets;
        }
    
        private Charset getContentTypeCharset(@Nullable MediaType contentType) {
            if (contentType != null && contentType.getCharset() != null) {
                return contentType.getCharset();
            } else if (contentType != null && contentType.isCompatibleWith(MediaType.APPLICATION_JSON)) {
                return StandardCharsets.UTF_8;
            } else {
                Charset charset = this.getDefaultCharset();
                Assert.state(charset != null, "No default charset");
                return charset;
            }
        }
    
        static {
            DEFAULT_CHARSET = StandardCharsets.ISO_8859_1;
        }
    }

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**修改默认字符集**

**WebConfig**

@Configuration
    public class WebConfig {
    
        @Bean
        public RestTemplate initRestTemplate(){
            RestTemplate restTemplate= new RestTemplate();
            restTemplate.getMessageConverters().set(1,new StringHttpMessageConverter(StandardCharsets.UTF_8));
    
            return restTemplate;
        }
    }

### \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\* ###

**使用测试**

**localhost:8080/hello**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzMTYyNQ_size_16_color_FFFFFF_t_70 1][]

**修改字符集后，中文乱码解决**

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzMTYyNQ_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20200630144650962.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzMTYyNQ==,size_16,color_FFFFFF,t_70
[2020063014380388.png]: https://img-blog.csdnimg.cn/2020063014380388.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzMTYyNQ_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20200630144748292.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzMTYyNQ==,size_16,color_FFFFFF,t_70