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最后一次解决mysql中文乱码!!!(

技术2022-05-11  0

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 |

 


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