作业需求：登陆注册系统中，注册时会调用一个方法来创建一个文件写入用户的密码、科目等信息，在doget()中调用该方法。随后在浏览器地址栏上写参数信息，科目的参数中有中文，结果看创建的文件该参数乱码了，显示一串问号。故登陆时也不能确认信息从而无法登陆。
PS:dopost()能较好实现，但作业任务要求doget()也实现，故提出此疑问。
调试时地址栏的输入：
http://localhost:8080/test3_1/register.do?email=1223@123.com&username=123&password=123123123&confirmedPasswd=123123123&subject=计算机
doget()相关代码
protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
request.setCharacterEncoding("utf-8");
String subject = request.getParameter("subject");
byte b[]=subject.getBytes("UTF-8");
subject=new String(b,"UTF-8");
String email = request.getParameter("email");
String username = request.getParameter("username");
String password = request.getParameter("password");
String confirmedPasswd = request.getParameter("confirmedPasswd");
System.out.println(subject);
List<String> errors = new ArrayList<String>();
if (isInvalidEmail(email)) {
errors.add("未填写邮件或邮件格式不正确");
}
if (isInvalidUsername(username)) {
errors.add("用户名称为空或已存在");
}
if (isInvalidPassword(password, confirmedPasswd)) {
errors.add("请确认密码符合格式并再次确认密码");
}
String resultPage = ERROR_VIEW;
if (!errors.isEmpty()) {
request.setAttribute("errors", errors);
} else {
resultPage = SUCCESS_VIEW;
createUserData(email, username, password, subject);
}
request.getRequestDispatcher(resultPage).forward(request, response);
}
写文件方法
private void createUserData(String email, String username, String password,
String subject) throws IOException {
File userhome = new File(USERS + "/" + username);
userhome.mkdir();
BufferedWriter writer = new BufferedWriter(new FileWriter(userhome
+ "/profile.txt"));
writer.write(email + "\t" + password + "\t" + subject);
writer.close();
}
显示页面html
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" >
<title>注册会员</title>
</head>
<body>
<h1>会员注册</h1>
<form method='post' action='register.do'>
<table bgcolor=#cccccc>
<tr>
<td>邮件地址：</td>
<td><input type='text' name='email' size='25' maxlength='100'>
</td>
</tr>
<tr>
<td>用户名（最大16字符）：</td>
<td><input type='text' name='username' size='25'
maxlength='16'>
</td>
</tr>
<tr>
<td>密码（6到16字符）：</td>
<td><input type='password' name='password' size='25' maxlength='16'>
</td>
</tr>
<tr>
<td>确认密码：</td>
<td><input type='password' name='confirmedPasswd' size='25' maxlength='16'>
</td>
</tr>
<tr>
<td>专业：</td>
<td><select name="subject" size="1" >
<option value="计算机">计算机</option>
<option value="软件工程">软件工程</option>
<option value="网络工程">网络工程</option>
</select></td>
</tr>
<tr>
<td colspan='2' align='center'><input type='submit' value='注册'>
</td>
</tr>
</table>
</form>
</body>
</html>
写后直接记事本打开，发现输入的subject参数一串问号。
已经查阅百度，写的编码或字符编码转换也应该加上了的，但还是不能解决。
希望有前辈补坑
