spring mvc 乱码

高了半天的乱码问题，搜这里搜那里的。

如果spring mvc 中文不想乱码，总结三点：

1.前端设定utf-8编码

<head>
        <meta charset="UTF-8">
</head>

2.tomcat 设定的utf-8编码

 <Connector executor="tomcatThreadPool"
               port="8090" protocol="HTTP/1.1"
               connectionTimeout="20000"
               redirectPort="8443" URIEncoding="utf-8"/>

3.工程后台在web.xml文件中设置过滤器filter

    <filter>
        <filter-name>characterEncodingFilter</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>characterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

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