GET提交参数乱码问题（apache-tomcat-9.0.0.M19）

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我用的IDE是myeclipse 2017 ci3 服务器为apache-tomcat-9.0.0.M19

// 在过滤器中判断如果是get提交并转码

if ("GET".equals(methoSubmit)) {
if (value != null && !"".equals(value.trim())) {
//tomcat服务器配置文件server.xml 中没有设置URIEncoding,
value = new String(value.getBytes("ISO-8859-1"), "utf-8"); //转换后就乱码，不转换正常
}
}

百度了很多文章都说tomcat服务器配置文件server.xml 中没有设置URIEncoding,默认为ISO-8859-1。

但如果是这样的话应该是转码后不会乱码才对。后来实在想不出问题出在哪。去官网查了官方文档。在官方文档的FAQ/CharacterEncoding

得到答案。原来tomcat8.0服务器起默认URIEncoding为utf-8编码。

下面部分对于GET提交参数的解释

How do I change how GET parameters are interpreted?

Tomcat will use ISO-8859-1 as the default character encoding of the entire URL, including the query string ("GET parameters") (though see Tomcat 8 notice below).

There are two ways to specify how GET parameters are interpreted:

Set the URIEncoding attribute on the <Connector> element in server.xml to something specific (e.g. URIEncoding="UTF-8").
Set the useBodyEncodingForURI attribute on the <Connector> element in server.xml to true. This will cause the Connector to use the request body's encoding for GET parameters.

In Tomcat 8 starting with 8.0.0 (8.0.0-RC3, to be specific), the default value of URIEncoding attribute on the <Connector> element depends on "strict servlet compliance" setting. The default value (strict compliance is off) of URIEncoding is now UTF-8. If "strict servlet compliance" is enabled, the default value is ISO-8859-1.

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