SpringMVC简单的登录-蒲公英云

一、创建WebProject工程, 选择对应的Maven

Center

二、修改pom.xml文件 (将dependencies所有的都替换)

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>springmvc</groupId>
    <artifactId>springmvc</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>war</packaging>
    <name />
    <description />
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>4.1.6.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>4.1.6.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1-b05</version>
        </dependency>
    </dependencies>
    <build>
        <finalName>springmvc</finalName>
        <sourceDirectory>${basedir}/src</sourceDirectory>
        <outputDirectory>${basedir}/WebRoot/WEB-INF/classes</outputDirectory>
        <resources>
            <resource>
                <directory>${basedir}/src</directory>
                <excludes>
                    <exclude>**/*.java</exclude>
                </excludes>
            </resource>
        </resources>
        <plugins>
            <plugin>
                <artifactId>maven-war-plugin</artifactId>
                <configuration>
                    <webappDirectory>${basedir}/WebRoot</webappDirectory>
                    <warSourceDirectory>${basedir}/WebRoot</warSourceDirectory>
                </configuration>
            </plugin>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.6</source>
                    <target>1.6</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

三、创建src/main/java; source Folder 如图所示(控制层controll; 业务层service;)

Center 1

四、spring-mvc.xml配置文件放在(WEB-INF文件下）

Center 2

spring-mvc.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:p="http://www.springframework.org/schema/p" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">
    <context:component-scan base-package="com.hlx" />
</beans>

修改web.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" 
    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_3_0.xsd">
  <display-name></display-name>    
   <!--启动Spring-->
   <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  <!-- 配置spring.xml ,可以是多个，用逗号隔开-->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath*:applicationContext.xml</param-value>
  </context-param> 
  <!-- DispatcherServlet核心对象 --> 
  <servlet>
    <servlet-name>spring</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>/WEB-INF/spring-mvc.xml</param-value>
    </init-param>
  </servlet>
  <!-- 映射路径为html ,do,可以修改其他的后缀 -->
  <servlet-mapping>
    <servlet-name>spring</servlet-name>
    <url-pattern>*.html</url-pattern>
  </servlet-mapping>
</web-app>

五、创建JSP页面

login.jsp页面

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!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>登录</title>
</head>
<body>
   <p style="color:red;font-size:16px">${error}</p>
    <form action="login.html" method="post">
        <p>
            用户名： <input name="uname" type="text">
        </p>
        <p>
            密  码： <input name="upasswd" type="password">
        </p>
        <p>
            <input type="submit" value="登录">
        </p>
    </form>
</body>
</html>

success.jsp页面

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!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>登录成功</title>
</head>
<body>
    <h1>登录成功</h1>
</body>
</html>

六、上面具体类的代码：

package com.hlx.service;
import org.springframework.stereotype.Service;
import org.springframework.web.servlet.ModelAndView;
@Service
public class LoginService {
    /**
     * 业务方法
     * @param err
     * @param ok
     * @param name
     * @param pwd
     * @return
     */
    public ModelAndView doLogin(String err,String ok,String name,String pwd){
        //判断
        if(name==null || "".equals(name)){
            return new  ModelAndView(err, "error", "用户名不能为空！");
        }
        if(pwd==null || "".equals(pwd)){
            return new  ModelAndView(err, "error", "密码不能为空！");
        }
        // uname = admin , passwd = aaa
        if("admin".equals(name)  && "aaa".equals(pwd)){
            return new ModelAndView(ok);
        }
        return new ModelAndView(err, "error", "用户名或者密码错误");
    }
}
package com.hlx.controll;
import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
import com.hlx.service.LoginService;
@Controller
public class LoginControll {
    //业务
    @Resource
    private LoginService service;
    //请求
    @Resource
    HttpServletRequest request;
    /**
     * 跳转的页面
     * @return
     */
    @RequestMapping("index")
    public ModelAndView toLoginPage(){
        return new ModelAndView("jsp/login.jsp");
    }
    /**
     * 调用业务方法
     * 
     * @return
     */
    @RequestMapping("login")
    public ModelAndView doLogin(){
        //跳转的错误页面
        String errPageString = "jsp/login.jsp";
        //跳转的成功页面
        String okPageString = "jsp/success.jsp";
        //获得用户名或密码
        String name = request.getParameter("uname");
        String pwd = request.getParameter("upasswd");
        //调用业务方法
        return service.doLogin(errPageString,okPageString,name,pwd);
    }
}