spring-搭建web项目
spring-搭建web项目
- 1.创建maven，web项目
- 2.加入依赖
- 3.拷贝ch07-spring-mybatis中的代码和配置文件
- 4.创建一个jsp发起请求，有参数id，name，email，age。
- 5.创建Servlet,接收请求参数，调用Service，调用dao完成注册
- 6.创建一个jsp作为显示结果的页面
- 1.之前做的是javase项目有main方法的，执行代码是执行main方法的，在main里面创建的容器对象。
ApplicationContext ctx = new ClassPathXmlApplicationContext("application.xml"); - 2.web项目是在tomcat服务器上运行的。tomcat一启动，项目是一致运行的。
- 3.需求：web项目中容器对象只需要创建一次，把容器对象放入到全局作用域servletContext中。
怎么实现：使用监听器，当全局作用域对象被创建时，创建容器，存入ServletContext.
监听器作用：
1）创建容器对象，执行
ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
2)把容器对象放入到ServletContext,ServletContext.setAttribute(key,ctx)
监听器可以自己创建，也可以 使用框架中提供好的ContextLoaderListener.
在web项目中使用spring，完成学生注册功能
1.创建maven，web项目
2.加入依赖
拷贝ch07-spring-mybatis中依赖，并加入 jsp,servlet依赖
<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>4.0.0modelVersion>
<groupId>com.putaogroupId>
<artifactId>ch11-spring-webartifactId>
<version>1.0-SNAPSHOTversion>
<packaging>warpackaging>
<properties>
<project.build.sourceEncoding>UTF-8project.build.sourceEncoding>
<maven.compiler.source>1.8maven.compiler.source>
<maven.compiler.target>1.8maven.compiler.target>
properties>
<dependencies>
<dependency>
<groupId>junitgroupId>
<artifactId>junitartifactId>
<version>4.11version>
<scope>testscope>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-contextartifactId>
<version>5.2.5.RELEASEversion>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-txartifactId>
<version>5.2.5.RELEASEversion>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-jdbcartifactId>
<version>5.2.5.RELEASEversion>
dependency>
<dependency>
<groupId>org.mybatisgroupId>
<artifactId>mybatisartifactId>
<version>3.5.1version>
dependency>
<dependency>
<groupId>org.mybatisgroupId>
<artifactId>mybatis-springartifactId>
<version>1.3.1version>
dependency>
<dependency>
<groupId>mysqlgroupId>
<artifactId>mysql-connector-javaartifactId>
<version>5.1.9version>
dependency>
<dependency>
<groupId>com.alibabagroupId>
<artifactId>druidartifactId>
<version>1.1.12version>
dependency>
<dependency>
<groupId>javax.servletgroupId>
<artifactId>javax.servlet-apiartifactId>
<version>3.1.0version>
<scope>providedscope>
dependency>
<dependency>
<groupId>javax.servlet.jspgroupId>
<artifactId>jsp-apiartifactId>
<version>2.2.1-b03version>
<scope>providedscope>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-webartifactId>
<version>5.2.5.RELEASEversion>
dependency>
dependencies>
<build>
<resources>
<resource>
<directory>src/main/javadirectory>
<includes>
<include>**/*.propertiesinclude>
<include>**/*.xmlinclude>
includes>
<filtering>falsefiltering>
resource>
resources>
<plugins>
<plugin>
<artifactId>maven-compiler-pluginartifactId>
<version>3.8.1version>
<configuration>
<source>1.8source>
<target>1.8target>
configuration>
plugin>
plugins>
build>
project>
3.拷贝ch07-spring-mybatis中的代码和配置文件
- 1）实体类
package com.putao.domain;
public class Student {
//属性名和列名一样
private Integer id;
private String name;
private String email;
private Integer age;
public Student() {
}
public Student(Integer id, String name, String email, Integer age) {
this.id = id;
this.name = name;
this.email = email;
this.age = age;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
@Override
public String toString() {
return "Student{" +
"id=" + id +
", name='" + name + '\'' +
", email='" + email + '\'' +
", age=" + age +
'}';
}
}
- 2）dao类，dao.xml类
package com.putao.dao;
import com.putao.domain.Student;
import java.util.List;
public interface StudentDao {
int insertStudent(Student student);
List<Student> selectStudents();
}
DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.putao.dao.StudentDao">
<insert id="insertStudent" >
insert into student values(#{id},#{name},#{email},#{age})
insert>
<select id="selectStudents" resultType="com.putao.domain.Student" >
select id,name,email,age from student order by id desc
select>
mapper>
- 3）service类，service实现类
package com.putao.service;
import com.putao.domain.Student;
import java.util.List;
public interface StudentService {
int addStudent(Student student);
List<Student> queryStudents();
}
package com.putao.service.impl;
import com.putao.dao.StudentDao;
import com.putao.domain.Student;
import com.putao.service.StudentService;
import java.util.List;
public class StudentServiceImpl implements StudentService {
//引用类型
private StudentDao studentDao;
//使用set注入，赋值
public void setStudentDao(StudentDao studentDao) {
this.studentDao = studentDao;
}
@Override
public int addStudent(Student student) {
int nums = studentDao.insertStudent(student);
return nums;
}
@Override
public List<Student> queryStudents() {
List<Student> students = studentDao.selectStudents();
return students;
}
}
- 4）配置文件
spring.xml
<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"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">
<context:property-placeholder location="classpath:jdbc.properties"/>
<bean id="myDataSource" class="com.alibaba.druid.pool.DruidDataSource"
init-method="init" destroy-method="close" >
<property name="url" value="${jdbc.url}"/>
<property name="username" value="${jdbc.username}" />
<property name="password" value="${jdbc.passwd}" />
<property name="maxActive" value="${jdbc.max}" />
bean>
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="myDataSource" />
<property name="configLocation" value="classpath:mybatis.xml" />
bean>
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" />
<property name="basePackage" value="com.putao.dao" />
bean>
<bean id="studentService" class="com.putao.service.impl.StudentServiceImpl">
<property name="studentDao" ref="studentDao" />
bean>
beans>
jdbc.properties
jdbc.url=jdbc:mysql://localhost:3306/springdb?characterEncoding=utf-8
jdbc.username=root
jdbc.passwd=root
jdbc.max=30
mybatis.xml
DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<typeAliases>
<package name="com.putao.domain"/>
typeAliases>
<mappers>
<package name="com.putao.dao"/>
mappers>
configuration>
4.创建一个jsp发起请求，有参数id，name，email，age。
index.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
Title
注册学生
5.创建Servlet,接收请求参数，调用Service，调用dao完成注册
package com.putao.controller;
import com.putao.domain.Student;
import com.putao.service.StudentService;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
public class RegisterServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String strId = request.getParameter("id");
String strName = request.getParameter("name");
String strEmail = request.getParameter("email");
String strAge = request.getParameter("age");
//创建spring的容器对象
// String config= "spring.xml";
// ApplicationContext ctx = new ClassPathXmlApplicationContext(config);
//org.springframework.context.support.ClassPathXmlApplicationContext@e685c79, started on Tue Sep 28 17:34:38 GMT+08:00 2021
//org.springframework.context.support.ClassPathXmlApplicationContext@56f7297a, started on Tue Sep 28 17:36:15 GMT+08:00 2021
// System.out.println("容器对象的信息===="+ctx);
WebApplicationContext ctx = null;
//获取ServletContext中的容器对象，创建好的容器对象，拿来就用
// String key = WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE;
// Object attr = getServletContext().getAttribute(key);
// if (attr != null){
// ctx = (WebApplicationContext) attr;
// }
//使用框架中的方法，获取容器对象
ServletContext sc = getServletContext();
ctx = WebApplicationContextUtils.getRequiredWebApplicationContext(sc);
//容器对象的信息====Root WebApplicationContext, started on Wed Sep 29 09:43:09 GMT+08:00 2021
//容器对象的信息====Root WebApplicationContext, started on Wed Sep 29 09:43:09 GMT+08:00 2021
System.out.println("容器对象的信息===="+ctx);
//获取service
StudentService service = (StudentService) ctx.getBean("studentService");
Student student = new Student();
student.setId(Integer.parseInt(strId));
student.setName(strName);
student.setEmail(strEmail);
student.setAge(Integer.valueOf(strAge));
service.addStudent(student);
//给一个页面
request.getRequestDispatcher("/result.jsp").forward(request,response);
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
}
}
6.创建一个jsp作为显示结果的页面
result.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
Title
result.jsp注册成功