servlet——登录练习（登录页面登录请求登录请求处理）
生活随笔
收集整理的這篇文章主要介紹了
servlet——登录练习（登录页面登录请求登录请求处理）
小編覺(jué)得挺不錯(cuò)的,現(xiàn)在分享給大家,幫大家做個(gè)參考.
導(dǎo)入Java包???放在這個(gè)目錄下
目錄的流程:
登錄流程
登錄練習(xí):
?? ?1、創(chuàng)建登錄頁(yè)面
?? ??? ?創(chuàng)建Servlet進(jìn)行登錄頁(yè)面請(qǐng)求處理
?? ?2、點(diǎn)擊登錄完成登錄操作
?? ??? ?瀏覽器發(fā)送請(qǐng)求到服務(wù)器(用戶信息+其他數(shù)據(jù))
?? ??? ?服務(wù)器調(diào)用對(duì)應(yīng)的servlet進(jìn)行處理
?? ??? ??? ?設(shè)置響應(yīng)編碼格式
?? ??? ??? ?獲取請(qǐng)求信息
?? ??? ??? ?處理請(qǐng)求信息? ? ?
?? ??? ??? ?響應(yīng)處理結(jié)果
?? ?3、在servlet中完成用戶登錄校驗(yàn)
?? ??? ??? ?需要連接數(shù)據(jù)庫(kù)(在mySql中創(chuàng)建用戶表)
?? ?使用MVC思想完成
1、創(chuàng)建登錄頁(yè)面
? ? ? ? 創(chuàng)建Servlet進(jìn)行登錄頁(yè)面請(qǐng)求處理
package com.dym.servlet;import java.io.IOException;import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;public class PageServlet extends HttpServlet {@Overrideprotected void service(HttpServletRequest req, HttpServletResponse resp)throws ServletException, IOException {//設(shè)置相應(yīng)編碼格式resp.setContentType("text/html;charset=utf-8");//獲取請(qǐng)求信息//處理請(qǐng)求//響應(yīng)處理結(jié)果resp.getWriter().write("<html>");resp.getWriter().write("<head>");resp.getWriter().write("</head>");resp.getWriter().write("<body>");resp.getWriter().write("<form action='login' method='get'>");resp.getWriter().write("用戶名：<input type='text' name='uname' value=''/><br/>");resp.getWriter().write("密碼：<input type='password' name='pwd' value=''/><br/>");resp.getWriter().write("<input type='submit' value='登錄'/><br/>");resp.getWriter().write("</form>");resp.getWriter().write("</body>");resp.getWriter().write("</html>");} }2、點(diǎn)擊登錄完成登錄操作
? ? ? ? ? ? 瀏覽器發(fā)送請(qǐng)求到服務(wù)器(用戶信息+其他數(shù)據(jù))
? ? ? ? ? ? 服務(wù)器調(diào)用對(duì)應(yīng)的servlet進(jìn)行處理
?? ??? ??? ?設(shè)置響應(yīng)編碼格式
?? ??? ??? ?獲取請(qǐng)求信息
?? ??? ??? ?處理請(qǐng)求信息? ? ?
?? ??? ??? ?響應(yīng)處理結(jié)果
User.java
package com.dym.pojo;public class User {private int uid;private String uname;private String pwd;public int getUid() {return uid;}public void setUid(int uid) {this.uid = uid;}public String getUname() {return uname;}public void setUname(String uname) {this.uname = uname;}public String getPwd() {return pwd;}public void setPwd(String pwd) {this.pwd = pwd;}@Overridepublic String toString() {return "User [uid=" + uid + ", uname=" + uname + ", pwd=" + pwd + "]";}@Overridepublic int hashCode() {final int prime = 31;int result = 1;result = prime * result + ((pwd == null) ? 0 : pwd.hashCode());result = prime * result + uid;result = prime * result + ((uname == null) ? 0 : uname.hashCode());return result;}@Overridepublic boolean equals(Object obj) {if (this == obj)return true;if (obj == null)return false;if (getClass() != obj.getClass())return false;User other = (User) obj;if (pwd == null) {if (other.pwd != null)return false;} else if (!pwd.equals(other.pwd))return false;if (uid != other.uid)return false;if (uname == null) {if (other.uname != null)return false;} else if (!uname.equals(other.uname))return false;return true;}public User() {super();// TODO Auto-generated constructor stub}public User(int uid, String uname, String pwd) {super();this.uid = uid;this.uname = uname;this.pwd = pwd;}}LoginService.java?
package com.dym.service;import com.dym.pojo.User;public interface LoginService {User checkLoginService(String uname,String pwd);}LoginServiceImpl.java
package com.dym.service.impl;import com.dym.dao.LoginDao; import com.dym.dao.impl.LoginDaoImpl; import com.dym.pojo.User; import com.dym.service.LoginService;public class LoginServiceImpl implements LoginService{//創(chuàng)建Dao層對(duì)象LoginDao ld=new LoginDaoImpl();@Overridepublic User checkLoginService(String uname, String pwd) {return ld.checkLoginDao(uname, pwd);} }LoginDao.java
package com.dym.dao;import com.dym.pojo.User;public interface LoginDao {//根據(jù)用戶名和密碼獲取用戶信息User checkLoginDao(String uname,String pwd);//根據(jù)uid獲取用戶信息User checkUidDao(String uid); }LoginDaoImpl.java
package com.dym.dao.impl;import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException;import com.dym.dao.LoginDao; import com.dym.pojo.User;public class LoginDaoImpl implements LoginDao{@Overridepublic User checkLoginDao(String uname, String pwd) {//聲明jdbc對(duì)象Connection conn=null;PreparedStatement ps=null;ResultSet rs=null;//聲明數(shù)據(jù)存儲(chǔ)對(duì)象User u=null;try {//加載驅(qū)動(dòng)Class.forName("com.mysql.jdbc.Driver");//獲取連接對(duì)象conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/wollo","root","123456");//創(chuàng)建sql命令String sql="select * from t_user where uname=? and pwd=?";//創(chuàng)建sql命令對(duì)象ps=conn.prepareStatement(sql);//給占位符賦值ps.setString(1, uname);ps.setString(2, pwd);//執(zhí)行rs=ps.executeQuery();//遍歷執(zhí)行結(jié)果while(rs.next()){u=new User();u.setUid(rs.getInt("uid"));u.setUname(rs.getString("uname"));u.setPwd(rs.getString("pwd"));}} catch (Exception e) {e.printStackTrace();}finally{//關(guān)閉資源try {rs.close();} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}try {ps.close();} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}try {conn.close();} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}}return u;}//根據(jù)UID獲取用戶信息@Overridepublic User checkUidDao(String uid) {//聲明Jdbc對(duì)象Connection conn=null;PreparedStatement ps=null;ResultSet rs=null;//聲明數(shù)據(jù)存儲(chǔ)對(duì)象User u=null;try {//加載驅(qū)動(dòng)Class.forName("com.mysql.jdbc.Driver");//獲取連接對(duì)象conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/407","root","1234");//創(chuàng)建Sql命令String sql="select * from t_user where uid=?";//創(chuàng)建Sql命令對(duì)象ps=conn.prepareStatement(sql);//給占位符賦值ps.setString(1, uid);//執(zhí)行rs=ps.executeQuery();//遍歷執(zhí)行結(jié)果while(rs.next()){u=new User();u.setUid(rs.getInt("uid"));u.setUname(rs.getString("uname"));u.setPwd(rs.getString("pwd"));}//關(guān)閉資源} catch (Exception e) {e.printStackTrace();}finally{try {rs.close();} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}try {ps.close();} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}try {conn.close();} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}}//返回return u;} }LoginServlet.java
package com.dym.servlet;import java.io.IOException;import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;import com.dym.pojo.User; import com.dym.service.LoginService; import com.dym.service.impl.LoginServiceImpl;public class LoginServlet extends HttpServlet {@Overrideprotected void service(HttpServletRequest req, HttpServletResponse resp)throws ServletException, IOException {//設(shè)置響應(yīng)編碼格式resp.setContentType("text/html;charset=utf-8");//獲取請(qǐng)求信息String uname=req.getParameter("uname");uname=new String(uname.getBytes("iso8859-1"),"utf-8"); //解決了亂碼問(wèn)題String pwd=req.getParameter("pwd");System.out.println(uname+":"+pwd);//處理請(qǐng)求信息//獲取業(yè)務(wù)層對(duì)象LoginService ls=new LoginServiceImpl();User u=ls.checkLoginService(uname, pwd);System.out.println(u);//響應(yīng)處理結(jié)果if(u!=null){resp.getWriter().write("登錄成功");}else{resp.getWriter().write("登錄失敗");}} }?
??
?
?
?
總結(jié)
以上是生活随笔為你收集整理的servlet——登录练习（登录页面登录请求登录请求处理）的全部?jī)?nèi)容，希望文章能夠幫你解決所遇到的問(wèn)題。
- 上一篇： os练习题9
- 下一篇： servlet——请求乱码问题解决