web应用，服务器是Tomcat，怎么解决请求中的乱码问题？

1、POST请求：request.setCharacterEncoding("UTF-8");
2、GET请求：修改server.xml文件，在Connector标签中添加URIEncoding="UTF-8"
3、万能方式，get和post都适用：
byte[] bytes = username.getBytes("ISO-8859-1");
username = new String(bytes,"UTF-8");

注：字符集不一定是UTF-8，主要看浏览器采用哪一种编码方式。

                resp.setContentType("application/octet-stream;charset=UTF-8");
String browser=req.getHeader("User-Agent");
String filename=URLEncoder.encode("市场活动列表", "UTF-8");
if(browser.toLowerCase().contains("firefox")){//Firefox FireFox  Firefox
filename=new String("市场活动列表".getBytes("UTF-8"),"ISO8859-1");
}
resp.addHeader("Content-Disposition", "attachment;filename="+filename+".xls");
//获取输出流
OutputStream os2=resp.getOutputStream();
/*InputStream is=new FileInputStream("d:/poi/activity.xls");
byte[] buff=new byte[256];
int len;
while((len=is.read(buff))!=-1){
os2.write(buff, 0, len);
}*/

wb.write(os2);
os2.flush();
//is.close();
wb.close();