本文详细介绍了如何解决网页乱码和数据库乱码问题。首先，要确保页面编码统一，如设置为UTF-8。其次，处理页面间参数传递时需设定正确的字符集。对于MySQL数据库乱码，可以通过修改my.ini配置文件，将默认字符集更改为GBK，以及在导入数据库时指定字符集，如使用`ALTER DATABASE`命令。重新启动MySQL服务后，确认字符集设置生效。
解決亂碼最好的方法是在項目設計之初，統一所有的字符集，例如頁面、request對象以及數據庫等等。
一、 幾種常見的亂碼現象：
1、頁面亂碼
單純的頁面亂碼是很好解決的，只要修改頭部適合的字符集即可，如果頁面中文顯示亂碼，你可以把字符集修改為：gb2312或gbk。
2、頁面之間傳遞的參數是亂碼
頁面之間傳遞參數出現的亂碼，就要解決頁面編碼和requset的字符集問題，在參數傳進傳出時重新設置相應的字符集。比如：request.setCharacterEncoding("UTF-8");
3、數據庫亂碼(下面詳細介紹)
二、數據庫亂碼解決方法(Mysql)
頁面和頁面傳值都沒有問題，結果發現存儲在數據庫中的數據出現了亂碼，則問題是出現在數據庫的編碼問題。
下面我已MySql數據庫為例說明解決方法：
如果你安裝數據庫的時候字符集使用的默認選項：latin1
DOS命令下進入數據庫show 一下字符集(命令：show variables like"%char%"; )顯示如下：
Java代碼
+--------------------------+---------------+
| Variable_name | Value |
+--------------------------+---------------+
| character_set_client | latin1 |
| character_set_connection | latin1 |
| character_set_database | latin1 |
| character_set_filesystem | binary |
| character_set_results | latin1 |
| character_set_server | latin1 |
| character_set_system | utf8 |
+--------------------------+---------------+
+--------------------------+---------------+| Variable_name | Value |+--------------------------+---------------+| character_set_client | latin1 || character_set_connection | latin1 || character_set_database | latin1 || character_set_filesystem | binary || character_set_results | latin1 || character_set_server | latin1 || character_set_system | utf8 |+--------------------------+---------------+
1、修改數據庫默認字符集：
打開C:\Program Files\MySQL\MySQL Server 5.0里面的my.ini文件找到這段文字：
引用
# The default character set that will be used when a new schema or table is
# created and no character set is defined
default-character-set=latin1
把default-character-set=latin1改為default-character-set=gbk
這時候show 一下字符集(重新啟動mysql服務 ，命令：show variables like"%char%"; )顯示如下：
Java代碼
+--------------------------+---------------+
| Variable_name | Value |
+--------------------------+---------------+
| character_set_client | latin1 |
| character_set_connection | latin1 |
| character_set_database | gbk |
| character_set_filesystem | binary
| character_set_results | latin1 |
| character_set_server | latin1 |
| character_set_system | utf8 |
+--------------------------+---------------+
+--------------------------+---------------+| Variable_name | Value |+--------------------------+---------------+| character_set_client | latin1 || character_set_connection | latin1 || character_set_database | gbk || character_set_filesystem | binary || character_set_results | latin1 || character_set_server | latin1 || character_set_system | utf8 |+--------------------------+---------------+
2、如果你是導入的數據庫，需要對my.ini做如下修改找到
引用
[client]
port=3306
[mysql]
default-character-set=latin1
把 default-character-set=latin1改為default-character-set=gbk
引用
# SERVER SECTION
# ----------------------------------------------------------------------
#
# The following options will be read by the MySQL Server. Make sure that
# you have installed the server correctly (see above) so it reads this
# file.
#
[mysqld]
找到
增加default-character-set=gbk
然后在設置一下你導入的數據庫字符集即可：
命令:alter database 你的數據庫名 charset = gbk;
重新啟動mysql服務,show 一下字符集(，命令：show variables like"%char%"; )顯示如下：
Java代碼
+--------------------------+---------------+
| Variable_name | Value |
+--------------------------+---------------+
| character_set_client | gbk |
| character_set_connection | gbk |
| character_set_database | gbk |
| character_set_filesystem | binary |
| character_set_results | gbk |
| character_set_server | gbk |
| character_set_system | utf8 |
+--------------------------+---------------+
+--------------------------+---------------+| Variable_name | Value |+--------------------------+---------------+| character_set_client | gbk || character_set_connection | gbk || character_set_database | gbk || character_set_filesystem | binary || character_set_results | gbk || character_set_server | gbk || character_set_system | utf8 |+--------------------------+---------------+
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