在导出给银行的开户文件时出现乱码，银行要求的文件编码格式为gbk，但在本地服务器导出的编码格式始终为utf-8，通过new String(fileName.getBytes("ISO-8859-1"), "GBK");等方法始终没有办法解决。最后经过测试发现与web容器本身的编码格式有关。
    最后修改tomcat的编码格式，顺利解决，具体如下：参考网址：http://www.blogjava.net/iduido/archive/2011/12/14/366364.html
    <?xml version=‘1.0‘ encoding=‘utf-8‘?>
 2 <Server port="8085" shutdown="SHUTDOWN">
 3 
 4   <Listener className="org.apache.catalina.core.AprLifecycleListener" SSLEngine="on" />
 5   <Listener className="org.apache.catalina.core.JasperListener" />
 6   <Listener className="org.apache.catalina.core.JreMemoryLeakPreventionListener" />
 7   <Listener className="org.apache.catalina.mbeans.ServerLifecycleListener" />
 8   <Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener" />
 9 
10   <GlobalNamingResources>
11     <Resource name="UserDatabase" auth="Container"
12               type="org.apache.catalina.UserDatabase"
13               description="User database that can be updated and saved"
14               factory="org.apache.catalina.users.MemoryUserDatabaseFactory"
15               pathname="conf/tomcat-users.xml" />
16   </GlobalNamingResources>
17 
18   <Service name="Catalina">
19     <Connector port="8088" protocol="HTTP/1.1"
20                connectionTimeout="20000"
21                redirectPort="8443"  URIEncoding=‘GBK‘/>
22 
23     <!-- Define an AJP 1.3 Connector on port 8009 -->
24     <Connector port="8809" protocol="AJP/1.3" redirectPort="8443" URIEncoding=‘GBK‘/>
25 
26     <Engine name="Catalina" defaultHost="localhost">
27       <Realm className="org.apache.catalina.realm.UserDatabaseRealm"
28              resourceName="UserDatabase"/>
29 
30       <Host name="localhost"  appBase="webapps"
31             unpackWARs="true" autoDeploy="true"
32             xmlValidation="false" xmlNamespaceAware="false">
33 
34 
35       </Host>
36     </Engine>
37   </Service>
38 </Server>

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