java对象乱码怎么办

request.setCharacterEncoding("UTF-8");

response.setCharacterEncoding("UTF-8");

<filter>
<filter-name>CharacterEncodingFilter</filter-name>
<filter-class>net.vschool.web.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>

<Host name="localhost"  appBase="webapps"
            unpackWARs="true" autoDeploy="true"
            xmlValidation="false" xmlNamespaceAware="false"  URIEncoding="UTF-8">

<a href="TestAction.do?name=<%=java.net.URLEncoder.encode("你好","UTF-8")%>" ></a>

response.setHeader("Content-disposition", "attachment;filename="+ URLEncoder.encode(fileName,"utf-8"));

String args = new String(strCn.getBytes("ISO-8859-1"),"UTF-8");

 jdbc:mysql://127.0.0.1:3306/database?useUnicode=true&characterEncoding=utf-8