java编码和Servlet API:setContentType或setCharacterEncoding

Question

只是想知道幕后是什么。 实际上，我们似乎可以设置编码：

• response.setContentType("text/html; charset=UTF-8")
• response.setCharacterEncoding("UTF-8")

有什么区别

Answer 1

这个javadoc非常清楚区别：

void setCharacterEncoding(String charset) Sets the character encoding (MIME charset) of the response being sent to the client, for example, to UTF-8. If the character encoding has already been set by setContentType(java.lang.String) or setLocale(java.util.Locale), this method overrides it. Calling setContentType(java.lang.String) with the String of text/html and calling this method with the String of UTF-8 is equivalent with calling setContentType with the String of text/html; charset=UTF-8.

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void setContentType(String type) Sets the content type of the response being sent to the client, if the response has not been committed yet. The given content type may include a character encoding specification, for example, text/html;charset=UTF-8.