处理中文乱码和判断不同角色进入不同主页面

1.处理传进来的中文但是显示成乱码
req.setCharacterEncoding("UTF-8");
String department = req.getParameter("department");
try {
// 再将其转换为UTF-8编码（假设前端传递数据是UTF-8编码的情况）
department = new String(department.getBytes("ISO-8859-1"), "UTF-8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}