本文主要給大家介紹了關於Spring向頁面傳值和接受頁面傳過來的參數的相關內容，分享出來供大家參考學習，下面來一起看看詳細的介紹：
一、從頁面接收參數
spring MVC接收請求提交的參數值的幾種方法：
1、使用HttpServletRequest獲取。
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@RequestMapping ( "/login.do" )
public String login(HttpServletRequest request){
String name = request.getParameter( "name" )
String pass = request.getParameter( "pass" )
}
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2、使用@RequestParam註解。
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@RequestMapping ( "/login.do" )
public String login(HttpServletRequest request,
String name,
@RequestParam ( "pass" )String password) // 表單屬性是pass,用變量password接收
{
syso(name);
syso(password)
}
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3、使用自動機制封裝成實體參數。
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<form action= "login.do" >
用户名：<input name= "name" />
密碼：<input name= "pass" />
<input type= "submit" value= "登陸" >
</form>
//封裝的User類
public class User{
private String name;
private String pass;
}
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@RequestMapping ( "/login.do" )
public String login(User user)
{
syso(user.getName());
syso(user.getPass());
}
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二、向頁面傳值
當Controller組件處理後，需要向響應JSP傳值時，可以使用的方法:
1)，使用HttpServletRequest 和 Session 然後setAttribute() ，就和Servlet中一樣
Model數據會利用HttpServletRequest的Attribute傳值到success.jsp中
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@RequestMapping ( "/login.do" )
public ModelAndView login(String name,String pass){
User user = userService.login(name,pwd);
Map<String,Object> data = new HashMap<String,Object>();
data.put( "user" ,user);
return new ModelAndView( "success" ,data);
}
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2)，使用ModelAndView對象
3)，使用ModelMap對象
使用ModelMap參數對象示例:
ModelMap數據會利用HttpServletRequest的Attribute傳值到success.jsp中
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@RequestMapping ( "/login.do" )
public String login(String name,String pass ,ModelMap model){
User user = userService.login(name,pwd);
model.addAttribute( "user" ,user);
model.put( "name" ,name);
return "success" ;
}
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4)，使用@ModelAttribute註解
使用@ModelAttribute示例
在Controller方法的參數部分或Bean屬性方法上使用@ModelAttribute數據會利用HttpServletRequest的Attribute傳值到success.jsp中
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@RequestMapping ( "/login.do" )
public String login( @ModelAttribute ( "user" ) User user){
//TODO
return "success" ;
}
@ModelAttribute ( "name" )
public String getName(){
return name;
}
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5）Session存儲：可以利用HttpServletReequest的getSession()方法
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@RequestMapping ( "/login.do" )
public String login(String name,String pwd
ModelMap model,HttpServletRequest request){
User user = serService.login(name,pwd);
HttpSession session = request.getSession();
session.setAttribute( "user" ,user);
model.addAttribute( "user" ,user);
return "success" ;
}
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6）自定義Map
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@ResponseBody
@RequestMapping (value = "/updatestatus" , method = RequestMethod.POST)
public Map<String, Object> updateStatus(HttpServletRequest request) {
Map<String, Object> result = new HashMap<String, Object>();
String id = request.getParameter( "id" );
SystemAdministrator sysadmin=systemAdminBiz.get(Integer.valueOf(id));
sysadmin.setStatus( 1 );
boolean flag = systemAdminBiz.update(sysadmin);
result.put( "status" , flag);
return result;
}
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@RequestMapping (value = "/list" , method = {RequestMethod.POST,RequestMethod.GET})
public String queryAdministrator(HttpServletRequest request,ModelMap model) {
Integer roleId = request.getParameter( "roleListById" ) == null ? 0 : Integer.parseInt(request.getParameter( "roleListById" ));
Map<String, Object> properties = new HashMap<String, Object>();
if (roleId.intValue() > 0 ) {
properties.put( "role:=" , roleId);
model.put( "roleId" , roleId);
}
List<SystemAdministrator> administrator = systemAdminBiz.find(properties);
List<SystemRole> systemRole = systemRoleBiz.getAll();
model.put( "administratorList" , administrator);
model.put( "roleList" , systemRole);
return "sys_admin_list" ;
}
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7）Spring MVC 默認採用的是轉發來定位視圖，如果要使用重定向，可以如下操作
1，使用RedirectView
2，使用redirect:前綴
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public ModelAndView login(){
RedirectView view = new RedirectView( "regirst.do" );
return new ModelAndView(view);
}
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或者用如下方法，工作中常用的方法：
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public String login(){
//TODO
return "redirect:regirst.do" ;
}
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三、實例講解：
步驟一：創建新Web項目，導入Spring MVC包和業務層UserService
1. 創建Web項目導入相關的jar包：
2. 導入前述業務層UserService類以及依賴的類，等。
User類代碼如下：
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package com.souvc.entity;
import java.io.Serializable;
public class User implements Serializable {
private static final long serialVersionUID = -603439325380668432L;
private int id;
private String name;
private String pwd;
private String phone;
public User() {
}
public User( int id, String name, String pwd, String phone) {
this .id = id;
this .name = name;
this .pwd = pwd;
this .phone = phone;
}
public User(String name, String pwd, String phone) {
super ();
this .name = name;
this .pwd = pwd;
this .phone = phone;
}
public int getId() {
return id;
}
public void setId( int id) {
this .id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this .name = name;
}
public String getPwd() {
return pwd;
}
public void setPwd(String pwd) {
this .pwd = pwd;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this .phone = phone;
}
@Override
public int hashCode() {
return id;
}
@Override
public boolean equals(Object obj) {
if ( this == obj)
return true ;
if (obj == null )
return false ;
if (obj instanceof User) {
User o = (User) obj;
return this .id == o.id;
}
return true ;
}
@Override
public String toString() {
return id + "," + name + "," + pwd + "," + phone;
}
}
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UserDao接口代碼如下：
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package com.souvc.dao;
import com.souvc.entity.User;
/**
* 用户數據訪問對象接口
*/
public interface UserDao {
/** 根據唯一用户名查詢系統用户, 如果沒有找到用户信息返回null */
public User findByName(String name);
// public User add(String name, String pwd, String phone);
// public User find(int id);
// public User delete(int id);
// public void update(User user);
}
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UserService類代碼如下：
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package com.souvc.service;
import java.io.Serializable;
import javax.annotation.Resource;
import org.springframework.stereotype.Service;
import com.souvc.dao.UserDao;
import com.souvc.entity.User;
/** 業務層 註解 */
@Service
// 默認的Bean ID是 userService
public class UserService implements Serializable {
private static final long serialVersionUID = 7360372166489952236L;
private UserDao userDao;
// @Resource //自動匹配userDao對象並注入
@Resource (name = "userDao" )
public void setUserDao(UserDao userDao) {
this .userDao = userDao; //
}
public UserDao getUserDao() {
return userDao;
}
/** 登錄系統功能 */
public User login(String name, String pwd) throws NameOrPwdException,
NullParamException {
if (name == null || name.equals( "" ) || pwd == null || pwd.equals( "" )) {
throw new NullParamException( "登錄參數不能為空！" );
}
User user = userDao.findByName(name);
if (user != null && pwd.equals(user.getPwd())) {
return user;
}
throw new NameOrPwdException( "用户名或者密碼錯誤" );
}
}
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NameOrPwdException類代碼如下：
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package com.souvc.service;
/** 用户名或者密碼錯誤 */
public class NameOrPwdException extends Exception {
public NameOrPwdException() {
}
public NameOrPwdException(String message) {
super (message);
}
public NameOrPwdException(Throwable cause) {
super (cause);
}
public NameOrPwdException(String message, Throwable cause) {
super (message, cause);
}
}
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NullParamException類代碼如下：
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package com.souvc.service;
/** 參數為空 */
public class NullParamException extends Exception {
public NullParamException() {
}
public NullParamException(String message) {
super (message);
}
public NullParamException(Throwable cause) {
super (cause);
}
public NullParamException(String message, Throwable cause) {
super (message, cause);
}
}
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JdbcDataSource類代碼如下：
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package com.souvc.dao;
import java.io.Serializable;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
/** 組件註解 */
@Component
public class JdbcDataSource implements Serializable {
private static final long serialVersionUID = -8925981939329398101L;
private String driver;
@Value ( "#{jdbcProps.url}" )
private String url;
@Value ( "#{jdbcProps.user}" )
private String user;
@Value ( "#{jdbcProps.pwd}" )
private String pwd;
public String getDriver() {
return driver;
}
/** 必須使用Bean屬性輸入, 否則不能進行JDBC Driver註冊 */
@Value ( "#{jdbcProps.driver}" )
public void setDriver(String driver) {
try {
// 註冊數據庫驅動
Class.forName(driver);
this .driver = driver;
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this .url = url;
}
public String getUser() {
return user;
}
public void setUser(String user) {
this .user = user;
}
public String getPwd() {
return pwd;
}
public void setPwd(String pwd) {
this .pwd = pwd;
}
public Connection getConnection() throws SQLException {
Connection conn = DriverManager.getConnection(url, user, pwd);
return conn;
}
public void close(Connection conn) {
if (conn != null ) {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}
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MysqlUserDao類代碼如下：
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package com.souvc.dao;
import java.io.Serializable;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Repository;
import com.souvc.entity.User;
/** 持久層 註解 */
@Repository ( "userDao" )
// 指定特定的Bean ID 方便setUserDao注入
public class MysqlUserDao implements UserDao, Serializable {
private static final long serialVersionUID = 7385842613248394287L;
private JdbcDataSource dataSource;
public MysqlUserDao() {
}
/** 創建 MysqlUserDAO 對象必須依賴於JDBCDataSource實例 */
public MysqlUserDao(JdbcDataSource dataSource) {
this .dataSource = dataSource;
}
@Autowired
// 按照類型自動裝配
public void setDataSource( @Qualifier ( "jdbcDataSource" )
JdbcDataSource dataSource) {
this .dataSource = dataSource;
}
public JdbcDataSource getDataSource() {
return dataSource;
}
/** 根據唯一用户名查詢系統用户, 如果沒有找到用户信息返回null */
public User findByName(String name) {
System.out.println( "利用JDBC技術查找User信息" );
String sql = "select id, name, pwd, phone from users where name=?" ;
Connection conn = null ;
try {
conn = dataSource.getConnection();
PreparedStatement ps = conn.prepareStatement(sql);
ps.setString( 1 , name);
ResultSet rs = ps.executeQuery();
User user = null ;
while (rs.next()) {
user = new User();
user.setId(rs.getInt( "id" ));
user.setName(rs.getString( "name" ));
user.setPwd(rs.getString( "pwd" ));
user.setPhone(rs.getString( "phone" ));
}
rs.close();
ps.close();
return user;
} catch (SQLException e) {
e.printStackTrace();
throw new RuntimeException(e);
} finally {
dataSource.close(conn);
}
}
}
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db.properties文件內容如下：
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# config for Mysql
driver=com.mysql.jdbc.Driver
url=jdbc:mysql: //localhost:3306/souvc
user=root
pwd= 123456
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spring-mvc.xml文件代碼如下：
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<? xml version = "1.0" encoding = "UTF-8" ?>
< beans xmlns = "http://www.springframework.org/schema/beans"
xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance"
xmlns:context = "http://www.springframework.org/schema/context"
xmlns:jdbc = "http://www.springframework.org/schema/jdbc"
xmlns:jee = "http://www.springframework.org/schema/jee"
xmlns:tx = "http://www.springframework.org/schema/tx"
xmlns:jpa = "http://www.springframework.org/schema/data/jpa"
xmlns:util = "http://www.springframework.org/schema/util"
xmlns:mvc = "http://www.springframework.org/schema/mvc"
xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd
http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.2.xsd
http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.2.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.2.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd">
< util:properties id = "jdbcProps" location = "classpath:db.properties" />
< context:component-scan base-package = "com.souvc" />
<!-- 視圖處理 -->
< bean id = "viewResolver" class = "org.springframework.web.servlet.view.InternalResourceViewResolver" >
< property name = "prefix" value = "/WEB-INF/jsp/" ></ property >
< property name = "suffix" value = ".jsp" ></ property >
</ bean >
</ beans >
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MySQL數據庫初始化SQL代碼如下：
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DROP TABLE users;
CREATE TABLE USERS
(
ID DOUBLE (7, 0) ,
NAME VARCHAR (50) ,
PWD VARCHAR (50),
PHONE VARCHAR (50) ,
PRIMARY KEY (id)
);
INSERT INTO Users (id, NAME , pwd, phone) VALUES (1, 'Tom' , '123' , '110' );
INSERT INTO Users (id, NAME , pwd, phone) VALUES (2, 'Jerry' , 'abc' , '119' );
INSERT INTO Users (id, NAME , pwd, phone) VALUES (3, 'Andy' , '456' , '112' );
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3. 為項目添加JUnit4 API，然後添加測試類TestCase和測試方法testUserService()用於測試上述配置是否正確。TestCase類代碼如下：
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package com.souvc.test;
import java.util.Properties;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.souvc.dao.JdbcDataSource;
import com.souvc.entity.User;
import com.souvc.service.UserService;
public class TestCase {
@Test
public void testUserService() throws Exception {
String cfg = "spring-mvc.xml" ;
ApplicationContext ac = new ClassPathXmlApplicationContext(cfg);
Properties obj = ac.getBean( "jdbcProps" , Properties. class );
JdbcDataSource ds = ac.getBean( "jdbcDataSource" , JdbcDataSource. class );
System.out.println(obj);
System.out.println(ds);
System.out.println(ds.getConnection());
UserService service = ac.getBean( "userService" , UserService. class );
User user = service.login( "Tom" , "123" );
System.out.println(user);
}
}
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執行測試方法testUserService()
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{user=root, url=jdbc:mysql://localhost:3306/souvc, driver=com.mysql.jdbc.Driver, pwd=123456}
com.souvc.dao.JdbcDataSource@1cb1a4e2
com.mysql.jdbc.JDBC4Connection@3d04fc23
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利用JDBC技術查找User信息
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這個結果説明業務層UserService工作正常。
4. 配置Spring MVC 核心控制器DispatcherServlet到web.xml。web.xml配置部分代碼參考如下：
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<? xml version = "1.0" encoding = "UTF-8" ?>
< web-app version = "2.5" xmlns = "http://java.sun.com/xml/ns/javaee"
xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
< welcome-file-list >
< welcome-file >index.jsp</ welcome-file >
</ welcome-file-list >
< servlet >
< servlet-name >springmvc</ servlet-name >
< servlet-class >
org.springframework.web.servlet.DispatcherServlet
</ servlet-class >
< init-param >
< param-name >contextConfigLocation</ param-name >
< param-value >classpath:spring-mvc.xml</ param-value >
</ init-param >
< load-on-startup >1</ load-on-startup >
</ servlet >
< servlet-mapping >
< servlet-name >springmvc</ servlet-name >
< url-pattern >*.form</ url-pattern >
</ servlet-mapping >
</ web-app >
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5. 部署項目到Tomcat並且啓動，測試Spring MVC配置是否正常。
在輸出結果中出現內容， 並且沒有異常就會説明Spring MVC部署正常。
步驟二：實現login-action1.form登錄流程，測試利用HttpServletRequrst傳值方法
1. 在WEB-INF/jsp文件夾下添加login-form.jsp文件，代碼如下所示：
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<%@ page pageEncoding="utf-8" contentType="text/html; charset=utf-8"%>
<!DOCTYPE HTML>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
< c:url var = "base" value = "/" ></ c:url >
< html >
< head >
< title >Login Form</ title >
< link rel = "stylesheet" type = "text/css" href = "${base}styles.css" rel = "external nofollow" rel = "external nofollow" >
</ head >
< body >
< h6 >${message}</ h6 >
< form method = "post" action = "${base}login/login-action1.form" >
< div >
< h2 >登錄 login-action1.form</ h2 >
< p >< label >用户</ label >< input type = "text" name = "name" ></ p >
< p >< label >密碼</ label >< input type = "password" name = "pwd" ></ p >
< h3 >< input type = "submit" value = "登錄" ></ h3 >
</ div >
</ form >
< form method = "post" action = "${base}login/login-action2.form" >
< div >
< h2 >登錄 login-action2.form</ h2 >
< p >< label >用户</ label >< input type = "text" name = "name" ></ p >
< p >< label >密碼</ label >< input type = "password" name = "pwd" ></ p >
< h3 >< input type = "submit" value = "登錄" ></ h3 >
</ div >
</ form >
< form method = "post" action = "${base}login/login-action3.form" >
< div >
< h2 >登錄 login-action3.form</ h2 >
< p >< label >用户</ label >< input type = "text" name = "name" ></ p >
< p >< label >密碼</ label >< input type = "password" name = "pwd" ></ p >
< h3 >< input type = "submit" value = "登錄" ></ h3 >
</ div >
</ form >
< form method = "post" action = "${base}login/login-action4.form" >
< div >
< h2 >登錄 login-action4.form</ h2 >
< p >< label >用户</ label >< input type = "text" name = "name" ></ p >
< p >< label >密碼</ label >< input type = "password" name = "pwd" ></ p >
< h3 >< input type = "submit" value = "登錄" ></ h3 >
</ div >
</ form >
< form method = "post" action = "${base}login/login-action5.form" >
< div >
< h2 >登錄 login-action5.form</ h2 >
< p >< label >用户</ label >< input type = "text" name = "name" ></ p >
< p >< label >密碼</ label >< input type = "password" name = "pwd" ></ p >
< h3 >< input type = "submit" value = "登錄" ></ h3 >
</ div >
</ form >
< form method = "post" action = "${base}login/login-action6.form" >
< div >
< h2 >登錄 login-action6.form</ h2 >
< p >< label >用户</ label >< input type = "text" name = "name" ></ p >
< p >< label >密碼</ label >< input type = "password" name = "pwd" ></ p >
< h3 >< input type = "submit" value = "登錄" ></ h3 >
</ div >
</ form >
</ body >
</ html >
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方法一解釋：
利用HttpServletRequest對象進行瀏覽器頁面到控制器傳值。
方法二解釋：
checkLogin2()方法。這樣就與login- form.jsp表單對應。
方法三解釋：
checkLogin3()
方法四解釋：
在處理方法完成後返回一個ModelAndView對象。
方法五解釋：
ModelMap屬性值與頁面login-form.jsp之間的數據對應。
方法六解釋：
@ModelAttribute聲明的屬性與login-form.jsp頁面的值關係。
用户名或者密碼錯誤時候出現的時候，能夠記住用户名。
在前述案例中，用户登錄成功以後， 可以利用HttpServletRequest對象的getSession()方法訪問Session對象， 這樣就可以保持用户登錄狀態了。
2. 為頁面添加樣式文件styles.css，樣式文件保存在WebRoot文件夾下，styles.css文件代碼如下所示：
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* {
margin : 0 ;
padding : 0 ;
}
h 6 {
text-align : center ;
color : red ;
padding : 10px ;
font-size : 14px ;
}
form {
padding : 10px ;
float : left ;
}
form div {
border : 1px gray solid ;
width : 320px ;
padding : 8px ;
}
form p input {
width : 180px
}
form h 2 input {
text-align : center ;
}
form h 2 {
background : black ;
color : white ;
padding : 4px ;
}
form p {
background : #ddd ;
padding : 4px 8px 0 8px ;
}
form h 3 {
background : #ddd ;
padding : 8px ;
}
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3. 在WEB-INF/jsp文件夾下添加success.jsp文件，這個文件是登錄成功以後顯示的界面，代碼如下所示：
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<%@ page pageEncoding="utf-8" contentType="text/html; charset=utf-8"%>
<!DOCTYPE HTML>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
< c:url var = "base" value = "/" ></ c:url >
< html >
< head >
< title >Success</ title >
< link rel = "stylesheet" type = "text/css" href = "${base}styles.css" rel = "external nofollow" rel = "external nofollow" >
</ head >
< body >
< h6 >
${user.name}登錄成功！
</ h6 >
</ body >
</ html >
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上述頁面中，使用EL表達式和標準標籤庫配合顯示界面數據， 其中<c:url var="base" value="/"></c:url>和${base}用於解決絕對路徑問題。
4. 創建控制器類LoginController，在該類中使用註解@Controller的方式進行配置：
1）使用@Controller將LoginController聲明為控制器Bean組件。
2）使用@RequestMapping("/login")聲明對LoginController組件的請求在/login 路徑下。
3）流程控制方法loginForm()，用於顯示登錄表單頁面。使用@RequestMapping註解將映射請求/login-form.form到loginForm()方法。
4）增加userService屬性，並且使用@Resource註解聲明在運行期間注入userService對象。
5）增加控制流程方法checkLogin1() ，使用@RequestMapping註解將請求/login-action1.form映 射到checkLogin1()方法。checkLogin1()方法調用userService的login方法，實現登錄流程。 checkLogin1()方法主要是測試JSP頁面到控制器的數據傳輸方式。
LoginController類代碼如下所示：
?
package com.souvc.controller;
import java.util.HashMap;
import java.util.Map;
import java.util.Random;
import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.ModelAndView;
import com.souvc.entity.User;
import com.souvc.service.NameOrPwdException;
import com.souvc.service.NullParamException;
import com.souvc.service.UserService;
@Controller
//@SessionAttributes("user")
@RequestMapping ( "/login" )
public class LoginController {
@Resource
// 請求Spring注入資源 userService
private UserService userService;
@RequestMapping ( "/login.form" )
public String loginForm() {
// 可以向表單界面傳遞一些參數
return "login-form" ;
}
@RequestMapping ( "/login-action1.form" )
// Spring MVC 自動參數注入HttpServletRequest
public String checkLogin1(HttpServletRequest req) {
System.out.println( "---方法一---" );
// 優點直接簡潔，缺點需要自己處理數據類型轉換， 不支持文件上傳功能
String name = req.getParameter( "name" );
String pwd = req.getParameter( "pwd" );
System.out.println(name);
System.out.println(pwd);
try {
User user = userService.login(name, pwd);
// 登錄成功將登錄用户信息保存到當前會話中
req.getSession().setAttribute( "user" , user);
return "success" ;
} catch (NameOrPwdException e) {
e.printStackTrace();
req.setAttribute( "message" , e.getMessage());
return "login-form" ;
} catch (NullParamException e) {
e.printStackTrace();
req.setAttribute( "message" , e.getMessage());
return "redirect:login.form" ;
} catch (RuntimeException e) {
e.printStackTrace();
req.setAttribute( "message" , e.getMessage());
return "error" ;
}
}
@RequestMapping ( "/login-action2.form" )
public String checkLogin2(String name, @RequestParam ( "pwd" )
String password, // 映射表單屬性不同的參數
HttpServletRequest req) {
System.out.println( "---方法二---" );
// 優點， 自動轉換數據類型， 缺點可能出現數據類型轉換異常
System.out.println(name);
System.out.println(password);
try {
User user = userService.login(name, password);
// 登錄成功將登錄用户信息保存到當前會話中
req.getSession().setAttribute( "user" , user);
return "success" ;
} catch (NameOrPwdException e) {
e.printStackTrace();
req.setAttribute( "message" , e.getMessage());
return "login-form" ;
} catch (NullParamException e) {
e.printStackTrace();
req.setAttribute( "message" , e.getMessage());
return "login-form" ;
} catch (RuntimeException e) {
e.printStackTrace();
req.setAttribute( "message" , e.getMessage());
return "error" ;
}
}
@RequestMapping ( "/login-action3.form" )
public String checkLogin3(User user, HttpServletRequest req) {
System.out.println( "---方法三---" );
// 自動填充到bean對象
System.out.println(user);
try {
user = userService.login(user.getName(), user.getPwd());
// 登錄成功將登錄用户信息保存到當前會話中
req.getSession().setAttribute( "user" , user);
return "success" ;
} catch (NameOrPwdException e) {
e.printStackTrace();
req.setAttribute( "message" , e.getMessage());
return "login-form" ;
} catch (NullParamException e) {
e.printStackTrace();
req.setAttribute( "message" , e.getMessage());
return "login-form" ;
} catch (RuntimeException e) {
e.printStackTrace();
req.setAttribute( "message" , e.getMessage());
return "error" ;
}
}
@RequestMapping ( "/login-action4.form" )
public ModelAndView checkLogin4(String name, String pwd,
HttpServletRequest req) {
System.out.println( "---方法四---" );
Map<String, Object> data = new HashMap<String, Object>();
try {
User user = userService.login(name, pwd);
// 登錄成功將登錄用户信息保存到當前會話中
req.getSession().setAttribute( "user" , user);
return new ModelAndView( "success" , data);
} catch (NameOrPwdException e) {
e.printStackTrace();
data.put( "message" , e.getMessage());
return new ModelAndView( "login-form" , data);
} catch (NullParamException e) {
e.printStackTrace();
data.put( "message" , e.getMessage());
return new ModelAndView( "login-form" , data);
} catch (RuntimeException e) {
e.printStackTrace();
data.put( "message" , e.getMessage());
return new ModelAndView( "error" , data);
}
}
@RequestMapping ( "/login-action5.form" )
public String checkLogin5(String name, String pwd, ModelMap model,
HttpServletRequest req) {
System.out.println( "---方法五---" );
try {
User user = userService.login(name, pwd);
// 登錄成功將登錄用户信息保存到當前會話中
req.getSession().setAttribute( "user" , user);
return "success" ;
} catch (NameOrPwdException e) {
e.printStackTrace();
model.addAttribute( "message" , e.getMessage());
return "login-form" ;
} catch (NullParamException e) {
e.printStackTrace();
model.addAttribute( "message" , e.getMessage());
return "login-form" ;
} catch (RuntimeException e) {
e.printStackTrace();
model.addAttribute( "message" , e.getMessage());
return "error" ;
}
}
@RequestMapping ( "/login-action6.form" )
public String checkLogin6(
@ModelAttribute ( "name" ) String name,
@ModelAttribute ( "password" ) String pwd,
ModelMap model, HttpServletRequest req){
System.out.println( "---方法六---" );
try {
User user = userService.login(name, pwd);
// 登錄成功將登錄用户信息保存到當前會話中
req.getSession().setAttribute( "user" , user);
return "success" ;
} catch (NameOrPwdException e) {
e.printStackTrace();
model.addAttribute( "message" , e.getMessage());
return "login-form" ;
} catch (NullParamException e) {
e.printStackTrace();
model.addAttribute( "message" , e.getMessage());
return "login-form" ;
} catch (RuntimeException e) {
e.printStackTrace();
model.addAttribute( "message" , e.getMessage());
return "error" ;
}
}
@RequestMapping ( "/login-action7.form" )
public String checkLogin7(ModelMap model, HttpServletRequest req) {
System.out.println( "---方法七---" );
String name1=req.getParameter( "name" );
String pwd1=req.getParameter( "pwd" );
try {
User user = userService.login(name1, pwd1);
// 登錄成功將登錄用户信息保存到當前會話中
req.getSession().setAttribute( "user" , user);
return "success" ;
} catch (NameOrPwdException e) {
e.printStackTrace();
model.addAttribute( "message" , e.getMessage());
return "redirect：login" ;
} catch (NullParamException e) {
e.printStackTrace();
model.addAttribute( "message" , e.getMessage());
return "redirect：login" ;
} catch (RuntimeException e) {
e.printStackTrace();
model.addAttribute( "message" , e.getMessage());
return "error" ;
}
}
private String[] msg = { "再來一次" , "下次就對了" , "沒關係還有機會" };
@ModelAttribute ( "next" )
public String getNext() {
Random r = new Random();
return msg[r.nextInt(msg.length)];
}
}
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5.測試login-action1.form登錄流程
通過網址“http://localhost:8080/SpringValues/login/login.form”請求Tomcat服務器：
訪問請求的信息打印在控制枱：
?
---方法一---
Tom
123
利用JDBC技術查找User信息
---方法二---
Tom
123
利用JDBC技術查找User信息
---方法三---
0,Tom,123,null
利用JDBC技術查找User信息
---方法四---
利用JDBC技術查找User信息
---方法五---
利用JDBC技術查找User信息
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總結
以上就是這篇文章的全部內容了，希望本文的內容對大家的學習或者工作能帶來一定的幫助，如果有疑問大家可以留言交流
