Section on garbled characters in Tomcat JSP web development

1. Static Page garbled
The file encoding is inconsistent with the encoding to be displayed in the browser.
1) Check the original file encoding. open the file in notepad and save it as a file;
2) Add a command to the current page to recommend that the browser use the specified encoding to display the file character content.
<Meta http-equiv = "Content-Type" content = "text/html; charset = GBK">
3) if the system is XP in English and the East Asian character set is not supported, garbled characters are displayed.

2. garbled JSP pages
1) The page command has a pageencoding = "GBK" which specifies the encoding of the current page to save. If it is written as a ISO8859-1, it cannot save Chinese characters;
2) page command contenttype = "text/html; charset = ISO8859-1" will also give the browser a priority to select a encoding like a static page.
If JSP code is garbled, it is usually displayed ?, And no matter what encoding you choose for the browser, it cannot be correctly displayed.
3. garbled form submission (tomcat-specific)
1). Post garbled characters
A. first, the encoding of the submitted form by the browser is determined based on the page where the form is located, rather than the code of the submitted JSP page. set the encoding of all pages to the same, for example, GBK.

B. The processing method is to set the encoding before obtaining the parameter:
Request. setcharacterencoding ("GBK ");

C. you can use the filter method to solve, tomcat has brought a ready-made:
APACHE-Tomcat-5.5.23/webapps/JSP-examples/WEB-INF/classes/filters/setcharacterencodingfilter. java
Web. XML

set character encoding
filters. setcharacterencodingfilter

encoding
GBK

<Filter-mapping>
<Filter-Name> set character encoding </filter-Name>
<URL-pattern>/* </url-pattern>
</Filter-mapping>
2) garbled get
Setcharacterencoding () cannot solve a bug in. tomcat. The form parameters transmitted in get mode are always encoded in ISO8859-1. We need to convert it into GBK mode.
String username = request. getparameter ("username ");
System. Out. println (username );
// Transcoding, first obtain the original binary byte array
Byte [] DATA = username. getbytes ("ISO8859-1 ");
// Construct a new string based on the new character set
Username = new string (data, "GBK ");

Summary:
All pages (except for the final get garbled problem) are encoded in a uniform (GBK or UTF-8), there will be no garbled problem.

4. encoding with a filter completely solves the form parameter garbled Problem

Filters that perfectly solve Chinese form problems in Tomcat 5/6 GBK Encoding