【WEB系列】RestTemplate之中文乱码问题fix

文章目录
  1. I. 中文乱码Fix
    1. 1. “罪魁祸首”
    2. 2. 指定StringHttpMessageConverter编码
    3. 3. 传参POJO
  2. II. 其他
    1. 0. 项目&系列博文
    2. 1. 一灰灰Blog

在RestTemplate基础用法博文中,post json表单时,会发现存在中文乱码问题,本文主要介绍对应的解决方案

I. 中文乱码Fix

1. “罪魁祸首”

场景复现

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/**
* json表单
*/
public void jsonPost() {
RestTemplate restTemplate = new RestTemplate();

HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_JSON);

JSONObject params = new JSONObject();
params.put("name", "一灰灰Blog");
params.put("age", 20);

HttpEntity<String> request = new HttpEntity<>(params.toJSONString(), headers);

String response = restTemplate.postForObject("http://127.0.0.1:8080/body", request, String.class);
log.info("json post res: {}", response);
}

输出结果如下:

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(json post res: params: {} | DemoRest.ReqBody(name=???Blog, age=20)
headers: {"content-length":"27","host":"127.0.0.1:8080","content-type":"application/json","connection":"keep-alive","accept":"text/plain, application/json, application/*+json, */*","user-agent":"Java/1.8.0_171"}
cookies:

原因定位

RestTemplate中存在一个HttpMessageConverter列表的属性成员,而HttpMessageConverter主要的职责就是消息转码

导致我们中文乱码的一个关键点在于StringHttpMessageConverter采用的默认编码格式为StandardCharsets.ISO_8859_1

2. 指定StringHttpMessageConverter编码

既然是因为StringHttpMessageConverter的默认编码不是UTF-8,那么将它手动改成utf-8不就over了么

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/**
* 中文乱码问题fix
*/
public void chinese() {
RestTemplate restTemplate = new RestTemplate();

HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_JSON);

JSONObject params = new JSONObject();
params.put("name", "一灰灰Blog");
params.put("age", 20);

HttpEntity<String> request = new HttpEntity<>(params.toJSONString(), headers);

// 中文乱码,主要是 StringHttpMessageConverter的默认编码为ISO导致的
List<HttpMessageConverter<?>> list = restTemplate.getMessageConverters();
for (HttpMessageConverter converter : list) {
if (converter instanceof StringHttpMessageConverter) {
((StringHttpMessageConverter) converter).setDefaultCharset(Charset.forName("UTF-8"));
break;
}
}

String response = restTemplate.postForObject("http://127.0.0.1:8080/body", request, String.class);
log.info("json post res: {}", response);
}

测试输出如:

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(json post res: params: {} | DemoRest.ReqBody(name=一灰灰Blog, age=20)
headers: {"content-length":"33","host":"127.0.0.1:8080","content-type":"application/json","connection":"keep-alive","accept":"text/plain, application/json, application/*+json, */*","user-agent":"Java/1.8.0_171"}
cookies:

3. 传参POJO

在看RestTemplateHttpMessageConvert时,会看到默认提供了一个MappingJackson2HttpMessageConverter,那么我们直接传参POJO,走Jackson序列化,是不是也可以解决中文乱码呢?

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@Data
@NoArgsConstructor
@AllArgsConstructor
public static class InnerParam implements Serializable {
private static final long serialVersionUID = -3693060057697231136L;
private String name;
private Integer age;
}


// 直接传一个POJO
public void chinese() {
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_JSON);

RestTemplate restTemplate = new RestTemplate();
InnerParam innerParam = new InnerParam("一灰灰Blog", 20);
String HttpEntity<InnerParam> entity = new HttpEntity<>(innerParam, headers);
response = restTemplate.postForObject("http://127.0.0.1:8080/body", entity, String.class);
log.info("json post DO res: {}", response);
}

输出结果如下

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(json post DO res: params: {} | DemoRest.ReqBody(name=一灰灰Blog, age=20)
headers: {"content-length":"33","host":"127.0.0.1:8080","content-type":"application/json","connection":"keep-alive","accept":"text/plain, application/json, application/*+json, */*","user-agent":"Java/1.8.0_171"}
cookies:

说明:上面的InnerParam对象改成HashMap,也是ok的

II. 其他

0. 项目&系列博文

博文

源码

1. 一灰灰Blog

尽信书则不如,以上内容,纯属一家之言,因个人能力有限,难免有疏漏和错误之处,如发现bug或者有更好的建议,欢迎批评指正,不吝感激

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一灰灰blog


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