Update 26.1.2. HttpMessageConverters.md
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### 26.1.2. HttpMessageConverters
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Spring MVC使用HttpMessageConverter接口转换HTTP请求和响应。合理的缺省值被包含的恰到好处(out of the box),例如对象可以自动转换为JSON(使用Jackson库)或XML(如果Jackson XML扩展可用则使用它,否则使用JAXB)。字符串默认使用UTF-8编码。
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如果需要添加或自定义转换器,你可以使用Spring Boot的HttpMessageConverters类:
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```java
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import org.springframework.boot.autoconfigure.web.HttpMessageConverters;
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import org.springframework.context.annotation.*;
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import org.springframework.http.converter.*;
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@Configuration
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public class MyConfiguration {
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@Bean
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public HttpMessageConverters customConverters() {
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HttpMessageConverter<?> additional = ...
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HttpMessageConverter<?> another = ...
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return new HttpMessageConverters(additional, another);
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}
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}
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```
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任何在上下文中出现的HttpMessageConverter bean将会添加到converters列表,你可以通过这种方式覆盖默认的转换器(converters)。
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