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Reasons for garbled characters in tomcat

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Release: 2024-04-21 10:18:13
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Causes of Tomcat garbled characters: 1. Character set mismatch; 2. HTTP response header is not set correctly; 3. Filter or encoder configuration error; 4. Web page encoding is incorrect; 5. Other reasons (including server client language, database encoding, and proxy server issues).

Reasons for garbled characters in tomcat

Causes of Tomcat garbled characters

Tomcat garbled characters are usually caused by the following reasons:

Character set mismatch

  • The client and server use different character sets, causing characters to be interpreted incorrectly.
  • The most common character set mismatch is when the client uses UTF-8 and the server uses ISO-8859-1.

HTTP response header is not set correctly

  • The HTTP response header is missing or incorrect "Content-Type" header, the header Specifies the character set of the response.
  • The correct "Content-Type" header should contain character set information, for example: "Content-Type: text/html; charset=UTF-8".

Filter or encoder configuration error

  • The configured filter or encoder may interfere with the character set, resulting in garbled characters.
  • Check that any filters or encoders you are using are configured correctly.

Incorrect web page encoding

  • The web page may use an incorrect character set encoding, causing the browser to interpret it incorrectly.
  • Make sure the web page uses the correct character set, such as UTF-8 or ISO-8859-1.

Other reasons

  • Server-side language issues: For example, the character set is not set correctly in the Java code.
  • Database encoding issues: Data retrieved from the database may use a different character set than the server.
  • Proxy server problem: The way the proxy server handles character sets may cause garbled characters.

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