java中文乱码问题解决

1 处理乱码方式：

1 连接数据库的时候  

         jdbc.properties:jdbc:mysql://localhost:3306/myproject?useUnicode=true&characterEncoding=utf8

2 修改mysql配置文件my.ini/my.cnf       default-character-set=utf8

3 修改tomcat中的配置文件server.xml改为

           <Connector port="8080" protocol="HTTP/1.1"

               connectionTimeout="20000"

               redirectPort="8443" URIEncoding="UTF-8"/>

4 在web.xml配置spring过滤器

<filter>

    <filter-name>char</filter-name>

    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>

    <init-param>

         <param-name>encoding</param-name>

         <param-value>UTF-8</param-value>

    </init-param>

</filter>

<filter-mapping>

    <filter-name>char</filter-name>

    <url-pattern>/*</url-pattern>

 </filter-mapping>

5 设置mysql字符集

      show variables like'character_set_%';

     把显示的character_set_**全都设置成utf8，即是：set character_set_serve='utf8'

            show variables like '%collation%';

     把显示的都设置成为如下：set collation_server='utf8_general_ci‘

6.取值时HTtp（post）请求中的中文乱码

在Servlet页面中 添加

request.setCharacterEncoding("utf-8"); 

user_name = request.getParameter("user_name") == null? "" : java.net.URLDecoder.decode(request.getParameter("user_name"), "UTF-8");

7。前台返回？？？？

后台赋值：errorMessage = URLEncoder.encode("redis中没有该定期数据信息", "UTF-8").replace("+", "%20");

前台取值：decodeURIComponent(errorMessage)