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Spring向页面传值和接受页面传过来的参数详解

程序员文章站 2023-12-18 16:49:58
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 m...

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。

 @requestmapping("/login.do") 
public string login(httpservletrequest request){ 
 string name = request.getparameter("name") 
 string pass = request.getparameter("pass") 
} 

2、使用@requestparam注解。

 @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。

 <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; 
 } 
 @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

 @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

 @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

 @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

 @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

@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;
 }
@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

 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:

 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:

Spring向页面传值和接受页面传过来的参数详解 

2. 导入前述业务层userservice类以及依赖的类,等。

user类代码如下:

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:

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:

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:

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:

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:

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:

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:

# 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:

<?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:

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:

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:

{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

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:

<?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:

<%@ 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:

* {
 margin: 0;
 padding: 0;
}

h6 {
 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 h2 input {
 text-align: center;
}

form h2 {
 background: black;
 color: white;
 padding: 4px;
}

form p {
 background: #ddd;
 padding: 4px 8px 0 8px;
}

form h3 {
 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:

<%@ 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>${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:

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:

---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,谢谢大家对的支持。

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