获取请求参数
獲取請求參數（*****）String getParameter(String name) （*****） String[] getParameterValues(String name)（*****） Map getParameterMap()（*****） Enumeration getParameterNames()（用的比較少）
request獲取請求參數
getParameter(name) --- String 通過name獲得值
getParameterValues? --- String[ ] 通過name獲得多值 checkbox
getParameterNames? --- Enumeration<String> 獲得所有name
getParameterMap? --- Map<String,String[ ]> key :name value: 多值
<!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>Insert title here</title> </head> <body><form action="/day10/reg" method="get"><table border="1" width="50%"><tr><td>輸入姓名</td><td><input type="text" name="username" /></td></tr><tr><td>輸入密碼</td><td><input type="password" name="password" /></td></tr><tr><td>選擇性別</td><td><input type="radio" name="sex" value="nan" />男<input type="radio" name="sex" value="nv" />女</td></tr><tr><td>選擇愛好</td><td><input type="checkbox" name="love" value="lq" />籃球<input type="checkbox" name="love" value="zq" />足球<input type="checkbox" name="love" value="pq" />排球</td></tr><tr><td>選擇城市</td><td><select name="city"><option value="none">--請選擇--</option><option value="bj">北京</option><option value="sh">上海</option><option value="gz">廣州</option></select></td></tr><tr><td colspan="2"><input type="submit" value="登陸"/></td></tr></table></form></body> </html> package cn.itcast.request;import java.io.IOException; import java.util.Arrays; import java.util.Map; import java.util.Set;import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;/*** 獲取請求參數* @author Administrator**/ public class RegServlet extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {/*** request獲取中文的亂碼* post請求（經常使用）* setCharacterEncoding(String env) 設置request的緩沖區的編碼* get請求 * username = new String(username.getBytes("ISO-8859-1"),"UTF-8");*/// 設置request緩沖區的編碼（一定要在request.getParameter("username");之前）// request.setCharacterEncoding("UTF-8");// 獲取內容，做其他操作// 獲取姓名String username = request.getParameter("username");// 解析get方式亂碼的問題username = new String(username.getBytes("ISO-8859-1"),"UTF-8");// 獲取密碼String password = request.getParameter("password");// 獲取性別String sex = request.getParameter("sex");// 獲取城市String city = request.getParameter("city");// 獲取愛好 返回是String數組String [] loves = request.getParameterValues("love");System.out.println("用戶名："+username);System.out.println("密碼："+password);System.out.println("性別："+sex);System.out.println("城市："+city);System.out.println("愛好："+Arrays.toString(loves));System.out.println("===================================================================");// 獲取map集合Map<String, String []> map = request.getParameterMap();// 循環遍歷Set<String> keys = map.keySet();for (String key : keys) {String [] values = map.get(key);System.out.println(Arrays.toString(values));}}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doGet(request, response);}}?
總結
- 上一篇： 获取请求头
- 下一篇： request获取中文乱码的问题