中文亂碼問題：
get方式：tomcat 8已經將get方式亂碼問題解決了
post方式：會出現亂碼
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>註冊頁面</title>
</head>
<body>
<form action="/RequestDemo07" method="post">
<input type="text" placeholder="請輸入用戶名" name="username"><br>
<input type="password" placeholder="請輸入密碼" name="password" ><br>
<input type="submit" value="註冊">
</form>
</body>
</html>
解決：在獲取參數前，設置request編碼request.setCharacterEncoding("utf-8");
package servlet.http.request;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
@WebServlet( "/RequestDemo07")
public class RequestDemo07 extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//設置流的編碼
request.setCharacterEncoding("utf-8");
//獲取請求參數username
String username = request.getParameter("username");
System.out.println(username);
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doPost(request,response);
}
}
