Request 根據使用者輸入的資訊獲取輸入到控制檯
阿新 • • 發佈：2021-01-19
html程式碼
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>註冊頁面</title> </head> <body> <form action="/register" method="post"> <input type="text" placeholder="使用者名稱" name="username"> <input type="password" placeholder="密碼" name="password"> <input type="checkbox" name="hobby" value="lq">籃球 <input type="checkbox" name="hobby" value="zq">足球 <input type="checkbox" name="hobby" value="ppq">乒乓球 <input type="checkbox" name="hobby" value="ymq">羽毛球 <input type="submit" value="註冊"> </form> </body> </html>
java程式碼
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.*; /** * @author shkstart * @create 2021-01-12 22:19 */ @WebServlet("/register") public class RegisterServlet extends HttpServlet { @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException { doGet(req, resp); } @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException { // 封裝了對應的獲取表單中的引數資訊的api方法 // 如果請求中攜帶的有中文資訊 需要設定編碼字符集 // 從tomcat8開始優化編碼字符集，針對get請求 // 對於post請求需要手動指定 req.setCharacterEncoding("UTF-8"); // 獲取使用者名稱 String username = req.getParameter("username"); System.out.println(username); System.out.println("---------------------------------------------------"); // 獲取所有的值封裝到map集合中 Map<String, String[]> map = req.getParameterMap(); Set<String> set = map.keySet(); Iterator<String> iterator = set.iterator(); // 遍歷set集合 while (iterator.hasNext()) { String name = iterator.next(); String[] values = map.get(name); System.out.println(name + "------" + Arrays.toString(values)); } System.out.println("---------------------------------------------------"); // commons-beanUtils Enumeration<String> names = req.getParameterNames(); while (names.hasMoreElements()) { String name = names.nextElement(); String[] values = req.getParameterValues(name); System.out.println(name + "------" + Arrays.toString(values)); } System.out.println("---------------------------------------------------"); String[] hobbies = req.getParameterValues("hobby"); System.out.println("hobby------" + Arrays.toString(hobbies)); } }