 
<%! 
public String codeToString(String str) 
{ 
String s=str; 
try 
{ 
byte temp[]=s.getBytes("ISO-8859-1"); 
s=new String(temp); 
return s; 
} 
catch(Exception e) 
{ 
return s; 
} 
} 
%> 

要轉(zhuǎn)換時只需：coedeToString(request.getParameter(..));就可以了，很好用的。
2.一種普遍適用的方法，加一個過濾器，之后就可以過上一勞永逸的日子了。

復(fù)制代碼代碼如下:

 
package filters; 
import java.io.IOException; 
import javax.servlet.Filter; 
import javax.servlet.FilterChain; 
import javax.servlet.FilterConfig; 
import javax.servlet.ServletException; 
import javax.servlet.ServletRequest; 
import javax.servlet.ServletResponse; 
import javax.servlet.http.HttpServletRequest; 
import javax.servlet.http.HttpServletRequestWrapper; 
public class TomcatFormFilter implements Filter { 
/** 
* Request.java 
* 對 HttpServletRequestWrapper 進(jìn)行擴(kuò)充, 不影響原來的功能并能提供所 
有的 HttpServletRequest 
* 接口中的功能. 它可以統(tǒng)一的對 Tomcat 默認(rèn)設(shè)置下的中文問題進(jìn)行解決而只 
需要用新的 Request 對象替換頁面中的 
* request 對象即可. 
*/ 
class Request extends HttpServletRequestWrapper 
{ 
public Request(HttpServletRequest request) { 
super(request); 
} 
/** 
* 轉(zhuǎn)換由表單讀取的數(shù)據(jù)的內(nèi)碼. 
* 從 ISO 字符轉(zhuǎn)到 GBK. 
*/ 
public String toChi(String input) { 
try { 
byte[] bytes = input.getBytes("ISO8859-1"); 
return new String(bytes, "GBK"); 
} 
catch (Exception ex) { 
} 
return null; 
} 
/** 
* Return the HttpServletRequest holded by this object. 
*/ 
private HttpServletRequest getHttpServletRequest() 
{ 
return (HttpServletRequest)super.getRequest(); 
} 
/** 
* 讀取參數(shù) -- 修正了中文問題. 
*/ 
public String getParameter(String name) 
{ 
return 
toChi(getHttpServletRequest().getParameter(name)); 
} 
/** 
* 讀取參數(shù)列表 - 修正了中文問題. 
*/ 
public String[] getParameterValues(String name) 
{ 
String values[] = 
getHttpServletRequest().getParameterValues(name); 
if (values != null) { 
for (int i = 0; i < values.length; i++) { 
values[i] = toChi(values[i]); 
} 
} 
return values; 
} 
} 
public void destroy() { 
} 
public void doFilter(ServletRequest request, ServletResponse 
response, 
FilterChain chain) throws IOException, ServletException { 
HttpServletRequest httpreq = (HttpServletRequest)request; 
if(httpreq.getMethod().equals("POST")) { 
request.setCharacterEncoding("GBK"); 
} else { 
request = new Request(httpreq); 
} 
chain.doFilter(request, response); 
} 
public void init(FilterConfig filterConfig) throws 
ServletException { 
} 
} 

當(dāng)然要記得改下web.xml

復(fù)制代碼代碼如下:

 
<filter> 
<filter-name>TomcatFormFilter</filter-name> 
<filter-class>filters.TomcatFormFilter</filter-class> 
</filter> 
<filter-mapping> 
<filter-name>TomcatFormFilter</filter-name> 
<url-pattern>/*</url-pattern> 
</filter-mapping> 

上面兩種方法都測試過了，比較好用，以后發(fā)現(xiàn)新的，會再更新哦~