- 根據參數名稱獲取參數值
String getParameter("參數名");
- 根據參數值名稱獲取參數值的數組（用於複選框）
String[] getParameterValues("參數名");
- 獲取所有請求的參數名稱(這種情況會造成複選框的值獲得不齊全，因爲這個方法返回值不是數組)
Enumeration<String> getParameterNames();
- 獲取所有參數的map集合（彌補了上一個方法的缺點）
Map<String,String[]> getParameterMap();
HttpServlet代碼
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;
import java.util.Enumeration;
import java.util.Map;
import java.util.Set;
@WebServlet("/Demo01")
public class Demo01 extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String username = request.getParameter("username");
System.out.println("Post");
System.out.println(username);
String[] hobbies = request.getParameterValues("hobby");
for(String hobby : hobbies){
System.out.println(hobby);
}
Enumeration<String> parameterNames = request.getParameterNames();
while (parameterNames.hasMoreElements()){
String name = parameterNames.nextElement();
System.out.println(name);
String value = request.getParameter(name);
System.out.println(value);
System.out.println("----------------");
}
Map<String,String[]> parameterMap = request.getParameterMap();
Set<String> keyset = parameterMap.keySet();
for(String name:keyset){
String[] values = parameterMap.get(name);
System.out.println(name);
for(String value:values){
System.out.println(value);
}
System.out.println("----------------");
}
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doPost(request,response);
HTML代碼
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<form action="/Demo01" method="get">
<input type="text" name="username" placeholder="請輸入用戶名"><br/>
<input type="text" name="password" placeholder="請輸入密碼"><br/>
<input type="checkbox" name="hobby" value="game">遊戲
<input type="checkbox" name="hobby" value="study">學習<br/>
<input type="submit" value="註冊">
</form>
</body>
</html>
