适用于简单的JSP页面之间传递中文，100%好使
String name=new String(roleform.getName().getBytes("ISO-8859-1"),"GB2312");
最简便的方法
配置个spring内置的过滤器： <filter> <filter-name>Spring character encoding filter</filter-name> <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> <init-param> <param-name>encoding</param-name> <param-value>GBK</param-value> </init-param> </filter> <filter-mapping> <filter-name>Spring character encoding filter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> 注意：该过滤器是老大，必须放在所有过滤器的前面想自找麻烦的看这个 我自己都不知道为了中文问题烦恼了多少个日子，最恨瑞典人了-谁叫他发明了mysql，还设置了默认设置：latin1.曾经也在想假如中国人发明了 mysql（my see狗），呵呵，那么我们还有这样烦恼吗？默认的就是gk2312 或者gbk.倘若考虑到台湾朋友加一个big5.就得了。可是呢？事实不是这样的，没有办法，自己只好baidu一下，google一下，甚至yahoo 一下。能找到的方法都试过了，好久了，直到今天让我找到了，想明白了。所以急切和大家分享以下心得。 为了说的明白一些，我觉个例子：很简单，就是从html中接受两个输入，然后由jsp处理写到mysql且从数据库返回这个结果显示出来。Mysql_jstl.html
<html><head> <title>CH14 - Mysql_jstl.html</title><meta http-equiv="Content-Type" content="text/html; charset= GB2312"></head><body> <h2>将信息存入 Mysql 中 - 使用 JSTL 写法</h2><form name="form" action="Mysql_jstl.jsp" method="post" > <p>姓：<input name="last_name" type="text" id="last_name"></p> <p>名：<input name="first_name" type="text" id="first_name"></p> <p> <input type="submit" value="传送"> <input type="reset" value="取消"> </p></form></body></html>
Mysql_jstl.jsp<%@ page contentType="text/html;charset=GB2312" %><%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %><%@ taglib prefix="sql" uri="http://java.sun.com/jsp/jstl/sql" %><%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %><html><head> <title>CH14 - Mysql_jstl.jsp</title></head><body><h2>将信息存入 Mysql 中 - 使用 JSTL 写法</h2><fmt:requestEncoding value="GB2312" /><c:set var="birth" value="1978/12/11" /><c:set var="sex" value="F" /><c:set var="email" value="aaa@asdf.com" /><sql:setDataSource driver="com.mysql.jdbc.Driver" url="jdbc:mysql://localhost:3306/sample?useUnicode=true&characterEncoding=UTF-8" user="root" password="44444" /><sql:update> INSERT INTO employee(employee_id, last_name, first_name, birth, sex, emmail) VALUES ( ? , ? , ? , ? , ? , ? ) <sql:param value="${employee_id}" /> <sql:param value="${param.last_name}" /> <sql:param value="${param.first_name}" /> <sql:param value="${birth}" /> <sql:param value="${sex}" /> <sql:param value="${email}" /> </sql:update><sql:query var="result"> SELECT * FROM employee</sql:query>从 employee 取出所有新增的姓名：<br><c:forEach items="${result.rows}" var="row" >新增姓名：<c:out value="${row.last_name}" /> <c:out value="${row.first_name}" /><br></c:forEach></body></html>
接下来就是创建数据库，名字为sample然后建立一个table: employee,内容如下（其中应该是email,可是我不小心在建数据库打错了，将错就错了）：+-------------+------------------+------+-----+---------+----------------+| Field | Type | Null | Key | Default | Extra |+-------------+------------------+------+-----+---------+----------------+| employee_id | int(10) unsigned | NO | PRI | NULL | auto_increment || last_name | varchar(20) | YES | | NULL | || first_name | varchar(20) | YES | | NULL | || birth | date | YES | | NULL | || sex | enum('m','f') | YES | | m | || emmail | varchar(39) | YES | | NULL | |+-------------+------------------+------+-----+---------+----------------+如果只是这样的话，就会出现这样的错误：报告的错误是：sqle=com.mysql.jdbc.MysqlDataTruncation: Data truncation: Data too long for column 'last_name' at row 1 .而且select last_name from employee.来看也出现了如下的情况：
| last_name |+-------------+| ?? || 54243654321 || ?? || ?? |+-------------+
出现问号！前面我们已经说过了，mysql默认的编码是latin1,不是我们所需要的gbk,所以我们要修改成为utf8，因为若要正确显示中文繁、简、日文、韩文 使用utf8，修改方法如下： ALTER DATABASE sample ####这里修改整个数据库的编码 CHARACTER SET utf8 DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT COLLATE utf8_general_ci;
当然了，你也可在在建数据库的时候指定编码，比如：
CREATE DATABASE sample
CHARACTER SET utf8 DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT COLLATE utf8_general_ci ;接下来要做的是打开mysql所在的目录下的my.nin
在[mysqld]段加入一下代码改成：default-character-set=utf8 启动mysql，输入：执行下列语句，看看结果是不是下面的：mysql> show variables like '%character%';+--------------------------+-------------------------------------------+| Variable_name | Value |+--------------------------+-------------------------------------------+| character_set_client | latin1 || character_set_connection | latin1 || character_set_database | utf8 || character_set_results | latin1 || character_set_server | utf8 | character_set_system | utf8 || character_sets_dir | C:/MySQL/MySQL Server 5.0/share/charsets/ |+--------------------------+-------------------------------------------+mysql> show variables like '%collation%';+----------------------+-------------------+| Variable_name | Value |+----------------------+-------------------+| collation_connection | latin1_swedish_ci || collation_database | utf8_general_ci || collation_server | utf8_general_ci |+----------------------+-------------------+ 接着你再看看执行那个Mysql.html 文件：这回你可以看到的是 mysql> select * from employee; +-------------+-----------+------------+------------+------+--------------+ | employee_id | last_name | first_name | birth | sex | emmail | +-------------+-----------+------------+------------+------+--------------+ | 12 | ? | ?? | 1978-12-11 | f | aaa@asdf.com | | 13 | ? | ?? | 1978-12-11 | f | aaa@asdf.com | | 14 | ? | ?? | 1978-12-11 | f | aaa@asdf.com | | 15 | ? | ?? | 1978-12-11 | f | aaa@asdf.com | | 16 | ? | ?? | 1978-12-11 | f | aaa@asdf.com | | 17 | ? | ?? | 1978-12-11 | f | aaa@asdf.com | +-------------+-----------+------------+------------+------+--------------+ 这当然不是我们希望看到的，我们需要的现实完美正确的中文：我们还有最后一招：mysql> SET NAMES 'gbk' ; Query OK, 0 rows affected (0.00 sec)因为我们需要的是gbk.看看mysql中的character设置情况：mysql> SHOW VARIABLES LIKE '%character%' ;+--------------------------+-------------------------------------------+| Variable_name | Value |+--------------------------+-------------------------------------------+| character_set_client | gbk || character_set_connection | gbk || character_set_database | utf8 || character_set_results | gbk || character_set_server | utf8 || character_set_system | utf8 || character_sets_dir | C:/MySQL/MySQL Server 5.0/share/charsets/ |+--------------------------+-------------------------------------------+7 rows in set (0.00 sec)mysql> SHOW VARIABLES LIKE '%collation%' ;+----------------------+-----------------+| Variable_name | Value |+----------------------+-----------------+| collation_connection | gbk_chinese_ci || collation_database | utf8_general_ci || collation_server | utf8_general_ci |+----------------------+-----------------+这个才是我们最终需要的。在来查看执行完Mysql_jstl.jsp后的数据库中的结果：mysql> select * from employee;| 14 | 王 | 彭给 | 1978-12-11 | f | aaa@asdf.com || 15 | 田 | 王光 | 1978-12-11 | f | aaa@asdf.com || 16 | 息 | 存入 | 1978-12-11 | f | aaa@asdf.com || 17 | 往 | 小杯 | 1978-12-11 | f | aaa@asdf.com |+-------------+-----------+------------+------------+------+--------------+可以高兴得看到了中文，并且在浏览器中也显示正确。但是仅仅这样的话，当你重新启动mysql的时候所有的设置又失效了。mysql> show variables like '%character%';+--------------------------+-------------------------------------------+| Variable_name | Value |+--------------------------+-------------------------------------------+| character_set_client | latin1 || character_set_connection | latin1 || character_set_database | utf8 || character_set_results | latin1 || character_set_server | utf8 || character_set_system | utf8 || character_sets_dir | C:/MySQL/MySQL Server 5.0/share/charsets/ |+--------------------------+-------------------------------------------+mysql> SHOW VARIABLES LIKE '%collation%' ;+----------------------+-------------------+| Variable_name | Value |+----------------------+-------------------+| collation_connection | latin1_swedish_ci || collation_database | utf8_general_ci || collation_server | utf8_general_ci |+----------------------+-------------------+重新读取又出现乱码：mysql> select * from employee;+-------------+-----------+------------+------------+--| employee_id | last_name | first_name | birth | s+-------------+-----------+------------+------------+--| 12 | ? | ?? | 1978-12-11 | f| 13 | ? | ?? | 1978-12-11 | f| 14 | ? | ?? | 1978-12-11 | f| 15 | ? | ?? | 1978-12-11 | f| 16 | ? | ?? | 1978-12-11 | f| 17 | ? | ?? | 1978-12-11 | f+-------------+-----------+------------+------------+--所以我们需要在客户端设置系统能识别中文的编码gbk并没有保存到my.ini文件中。所以要修改my.ini文件 在[mysql]段加入一下代码改成：default-character-set=gbk 这样设置就得到保存了。重启就可以了。mysql> show variables like '%character%';+--------------------------+----------------| Variable_name | Value+--------------------------+----------------| character_set_client | gbk| character_set_connection | gbk| character_set_database | utf8| character_set_results | gbk| character_set_server | utf8| character_set_system | utf8| character_sets_dir | C:/MySQL/MySQL+--------------------------+----------------mysql> SHOW VARIABLES LIKE '%collation%' ;+----------------------+-----------------+| Variable_name | Value |+----------------------+-----------------+| collation_connection | gbk_chinese_ci || collation_database | utf8_general_ci || collation_server | utf8_general_ci |
