本文主要给大家介绍了关于Spring向页面传值和接受页面传过来的参数的相关内容,分享出来供大家参考学习,下面来一起看看详细的介绍:
一、从页面接收参数
spring MVC接收请求提交的参数值的几种方法:
1、使用HttpServletRequest获取。
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@RequestMapping ( "/login.do" ) public String login(HttpServletRequest request){ String name = request.getParameter( "name" ) String pass = request.getParameter( "pass" ) } |
2、使用@RequestParam注解。
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@RequestMapping ( "/login.do" ) public String login(HttpServletRequest request, String name, @RequestParam ( "pass" )String password) // 表单属性是pass,用变量password接收 { syso(name); syso(password) } |
3、使用自动机制封装成实体参数。
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<form action= "login.do" > 用户名:<input name= "name" /> 密码:<input name= "pass" /> <input type= "submit" value= "登陆" > </form> //封装的User类 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()); } |
二、向页面传值
当Controller组件处理后,需要向响应JSP传值时,可以使用的方法:
1),使用HttpServletRequest 和 Session 然后setAttribute()
,就和Servlet中一样
Model数据会利用HttpServletRequest的Attribute传值到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); } |
2),使用ModelAndView对象
3),使用ModelMap对象
使用ModelMap参数对象示例:
ModelMap数据会利用HttpServletRequest的Attribute传值到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" ; } |
4),使用@ModelAttribute注解
使用@ModelAttribute示例
在Controller方法的参数部分或Bean属性方法上使用@ModelAttribute数据会利用HttpServletRequest的Attribute传值到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; } |
5)Session存储: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" ; } |
6)自定义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" ; } |
7)Spring MVC 默认采用的是转发来定位视图,如果要使用重定向,可以如下操作
1,使用RedirectView
2,使用redirect:前缀
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public ModelAndView login(){ RedirectView view = new RedirectView( "regirst.do" ); return new ModelAndView(view); } |
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" ; } |
三、实例讲解:
步骤一:创建新Web项目,导入Spring MVC包和业务层UserService
1. 创建Web项目导入相关的jar包:
2. 导入前述业务层UserService类以及依赖的类,等。
User类代码如下:
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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; } } |
UserDao接口代码如下:
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package com.souvc.dao; import com.souvc.entity.User; /** * 用户数据访问对象接口 */ public interface UserDao { /** 根据唯一用户名查询系统用户, 如果没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); } |
UserService类代码如下:
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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; /** 业务层 注解 */ @Service // 默认的Bean ID是 userService public class UserService implements Serializable { private static final long serialVersionUID = 7360372166489952236L; private UserDao userDao; // @Resource //自动匹配userDao对象并注入 @Resource (name = "userDao" ) public void setUserDao(UserDao userDao) { this .userDao = userDao; // } public UserDao getUserDao() { return userDao; } /** 登录系统功能 */ public User login(String name, String pwd) throws NameOrPwdException, NullParamException { if (name == null || name.equals( "" ) || pwd == null || pwd.equals( "" )) { throw new NullParamException( "登录参数不能为空!" ); } User user = userDao.findByName(name); if (user != null && pwd.equals(user.getPwd())) { return user; } throw new NameOrPwdException( "用户名或者密码错误" ); } } |
NameOrPwdException类代码如下:
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package com.souvc.service; /** 用户名或者密码错误 */ 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); } } |
NullParamException类代码如下:
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package com.souvc.service; /** 参数为空 */ 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); } } |
JdbcDataSource类代码如下:
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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; /** 组件注解 */ @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; } /** 必须使用Bean属性输入, 否则不能进行JDBC Driver注册 */ @Value ( "#{jdbcProps.driver}" ) public void setDriver(String driver) { try { // 注册数据库驱动 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(); } } } } |
MysqlUserDao类代码如下:
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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; /** 持久层 注解 */ @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() { } /** 创建 MysqlUserDAO 对象必须依赖于JDBCDataSource实例 */ public MysqlUserDao(JdbcDataSource dataSource) { this .dataSource = dataSource; } @Autowired // 按照类型自动装配 public void setDataSource( @Qualifier ( "jdbcDataSource" ) JdbcDataSource dataSource) { this .dataSource = dataSource; } public JdbcDataSource getDataSource() { return dataSource; } /** 根据唯一用户名查询系统用户, 如果没有找到用户信息返回null */ public User findByName(String name) { System.out.println( "利用JDBC技术查找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); } } } |
db.properties文件内容如下:
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# config for Mysql driver=com.mysql.jdbc.Driver url=jdbc:mysql: //localhost:3306/souvc user=root pwd= 123456 |
spring-mvc.xml文件代码如下:
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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" /> <!-- 视图处理 --> < 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 > |
MySQL数据库初始化SQL代码如下:
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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' ); |
3. 为项目添加JUnit4 API,然后添加测试类TestCase和测试方法testUserService()
用于测试上述配置是否正确。TestCase类代码如下:
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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); } } |
执行测试方法testUserService()
,在控制台输出的结果:
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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 |
利用JDBC技术查找User信息
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1,Tom,123,110 |
这个结果说明业务层UserService工作正常。
4. 配置Spring MVC 核心控制器DispatcherServlet到web.xml。web.xml配置部分代码参考如下:
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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 > |
5. 部署项目到Tomcat并且启动,测试Spring MVC配置是否正常。
在输出结果中出现内容, 并且没有异常就会说明Spring MVC部署正常。
步骤二:实现login-action1.form登录流程,测试利用HttpServletRequrst传值方法
1. 在WEB-INF/jsp文件夹下添加login-form.jsp文件,代码如下所示:
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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 = "${base}login/login-action1.form" > < div > < h2 >登录 login-action1.form</ h2 > < p >< label >用户</ label >< input type = "text" name = "name" ></ p > < p >< label >密码</ label >< input type = "password" name = "pwd" ></ p > < h3 >< input type = "submit" value = "登录" ></ h3 > </ div > </ form > < form method = "post" action = "${base}login/login-action2.form" > < div > < h2 >登录 login-action2.form</ h2 > < p >< label >用户</ label >< input type = "text" name = "name" ></ p > < p >< label >密码</ label >< input type = "password" name = "pwd" ></ p > < h3 >< input type = "submit" value = "登录" ></ h3 > </ div > </ form > < form method = "post" action = "${base}login/login-action3.form" > < div > < h2 >登录 login-action3.form</ h2 > < p >< label >用户</ label >< input type = "text" name = "name" ></ p > < p >< label >密码</ label >< input type = "password" name = "pwd" ></ p > < h3 >< input type = "submit" value = "登录" ></ h3 > </ div > </ form > < form method = "post" action = "${base}login/login-action4.form" > < div > < h2 >登录 login-action4.form</ h2 > < p >< label >用户</ label >< input type = "text" name = "name" ></ p > < p >< label >密码</ label >< input type = "password" name = "pwd" ></ p > < h3 >< input type = "submit" value = "登录" ></ h3 > </ div > </ form > < form method = "post" action = "${base}login/login-action5.form" > < div > < h2 >登录 login-action5.form</ h2 > < p >< label >用户</ label >< input type = "text" name = "name" ></ p > < p >< label >密码</ label >< input type = "password" name = "pwd" ></ p > < h3 >< input type = "submit" value = "登录" ></ h3 > </ div > </ form > < form method = "post" action = "${base}login/login-action6.form" > < div > < h2 >登录 login-action6.form</ h2 > < p >< label >用户</ label >< input type = "text" name = "name" ></ p > < p >< label >密码</ label >< input type = "password" name = "pwd" ></ p > < h3 >< input type = "submit" value = "登录" ></ h3 > </ div > </ form > </ body > </ html > |
方法一解释:
利用HttpServletRequest对象进行浏览器页面到控制器传值。
方法二解释:
使用@RequestParam注解声明表单密码输入框pwd的值注入到password变量,表单中用户名输入框根据名字映自动射注入name变量。 @RequestMapping注解将login-action2.form映射到了checkLogin2()
方法。这样就与login- form.jsp表单对应。
方法三解释:
这里采用user作为参数, Spring会自动的将页面表单参数name,pwd注入到user对象的相应属性name,pwd传递到方法中。@RequestMapping将请求login-action3.form映射到方法checkLogin3()
。
方法四解释:
在处理方法完成后返回一个ModelAndView对象。
方法五解释:
ModelMap属性值与页面login-form.jsp之间的数据对应。
方法六解释:
@ModelAttribute声明的属性与login-form.jsp页面的值关系。
用户名或者密码错误时候出现的时候,能够记住用户名。
在前述案例中,用户登录成功以后, 可以利用HttpServletRequest对象的getSession()
方法访问Session对象, 这样就可以保持用户登录状态了。
2. 为页面添加样式文件styles.css,样式文件保存在WebRoot文件夹下,styles.css文件代码如下所示:
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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 ; } |
3. 在WEB-INF/jsp文件夹下添加success.jsp文件,这个文件是登录成功以后显示的界面,代码如下所示:
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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 > ${user.name}登录成功! </ h6 > </ body > </ html > |
上述页面中,使用EL表达式和标准标签库配合显示界面数据, 其中<c:url var="base" value="/"></c:url>
和${base}
用于解决绝对路径问题。
4. 创建控制器类LoginController,在该类中使用注解@Controller的方式进行配置:
1)使用@Controller将LoginController声明为控制器Bean组件。
2)使用@RequestMapping("/login")
声明对LoginController组件的请求在/login 路径下。
3)流程控制方法loginForm(),用于显示登录表单页面。使用@RequestMapping注解将映射请求/login-form.form到loginForm()方法。
4)增加userService属性,并且使用@Resource注解声明在运行期间注入userService对象。
5)增加控制流程方法checkLogin1()
,使用@RequestMapping注解将请求/login-action1.form映 射到checkLogin1()方法。checkLogin1()
方法调用userService的login方法,实现登录流程。 checkLogin1()
方法主要是测试JSP页面到控制器的数据传输方式。
LoginController类代码如下所示:
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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 // 请求Spring注入资源 userService private UserService userService; @RequestMapping ( "/login.form" ) public String loginForm() { // 可以向表单界面传递一些参数 return "login-form" ; } @RequestMapping ( "/login-action1.form" ) // Spring MVC 自动参数注入HttpServletRequest public String checkLogin1(HttpServletRequest req) { System.out.println( "---方法一---" ); // 优点直接简洁,缺点需要自己处理数据类型转换, 不支持文件上传功能 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); // 登录成功将登录用户信息保存到当前会话中 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, // 映射表单属性不同的参数 HttpServletRequest req) { System.out.println( "---方法二---" ); // 优点, 自动转换数据类型, 缺点可能出现数据类型转换异常 System.out.println(name); System.out.println(password); try { User user = userService.login(name, password); // 登录成功将登录用户信息保存到当前会话中 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---" ); // 自动填充到bean对象 System.out.println(user); try { user = userService.login(user.getName(), user.getPwd()); // 登录成功将登录用户信息保存到当前会话中 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); // 登录成功将登录用户信息保存到当前会话中 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); // 登录成功将登录用户信息保存到当前会话中 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); // 登录成功将登录用户信息保存到当前会话中 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); // 登录成功将登录用户信息保存到当前会话中 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 = { "再来一次" , "下次就对了" , "没关系还有机会" }; @ModelAttribute ( "next" ) public String getNext() { Random r = new Random(); return msg[r.nextInt(msg.length)]; } } |
5.测试login-action1.form登录流程
通过网址“http://localhost:8080/SpringValues/login/login.form”请求Tomcat服务器:
访问请求的信息打印在控制台:
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---方法一--- Tom 123 利用JDBC技术查找User信息 ---方法二--- Tom 123 利用JDBC技术查找User信息 ---方法三--- 0,Tom,123,null 利用JDBC技术查找User信息 ---方法四--- 利用JDBC技术查找User信息 ---方法五--- 利用JDBC技术查找User信息 |
总结
以上就是这篇文章的全部内容了,希望本文的内容对大家的学习或者工作能带来一定的帮助,如果有疑问大家可以留言交流,谢谢大家对服务器之家的支持。
原文链接:http://blog.csdn.net/hustwht/article/details/52374559