javaweb——spring第一坑（项目搭建

1、创建maven web项目，配置spring依赖

a、idea创建maven项目，添加spring framework组件，具体配置步骤太多人写了

b、在pom.xml中配置spring依赖

	<!-- spring框架依赖 -->
	<dependency>
    	<groupId>org.springframework</groupId>
	    <artifactId>spring-context</artifactId>
	    <version>4.3.9.RELEASE</version>
	</dependency>

然后更新项目即可

注：maven默认下载源下载速度可能会比较慢，可以换其他速度快的镜像

找到 apache-maven-3.5.2\conf 目录中的 settings.xml 文件
添加阿里源 ，找到 <mirrors> </ mirrors>标签，在标签内部 添加内容如下：

	<mirror>
        <id>nexus-aliyun</id>
        <mirrorOf>central</mirrorOf>
        <name>Nexus aliyun</name>
        <url>http://maven.aliyun.com/nexus/content/groups/public</url>
	</mirror>

速度不能飞起来但比原来的快多了

PS：

依照上文项目搭建完毕，结构如下图

测试spring IOC的简单实现

a、首先在java文件夹中创建一个student类，用来封装数据

public class Student {
    private int stuNum;
    private String stuName;
    private String stuAddress;

    public void setStuAddress(String stuAddress) {

        this.stuAddress = stuAddress;
    }

    public void setStuName(String stuName) {
        this.stuName = stuName;
    }

    public void setStuNum(int stuNum) {
        this.stuNum = stuNum;
    }

    public int getStuNum() {
        return stuNum;
    }

    public String getStuAddress() {
        return stuAddress;
    }

    public String getStuName() {
        return stuName;
    }

    @Override
    public String toString() {
        return "Student{" +
                "stuNum=" + stuNum +
                ", stuName='" + stuName + '\'' +
                ", stuAddress='" + stuAddress + '\'' +
                '}';
    }
}

b、然后在applicationContext.xml中配置响应的 bean标签

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="student" class="top.voidplus.entity.Student">
        <property name="stuNum" value="1"></property>
        <property name="stuName" value="ada"></property>
        <property name="stuAddress" value="china"></property>
    </bean>
</beans>

c、新建一个servlet，在servlet中将bean打印出来

package top.voidplus.controller;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import top.voidplus.entity.Student;

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 TestServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        // spring IOC
        // 获取 applicationContext的上下文对象	，注意applicationContext的路径应该都是这个
        ApplicationContext context = new ClassPathXmlApplicationContext("META-INF/applicationContext.xml");
        Student student = (Student)context.getBean("student");
        System.out.println(student.toString());
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req,resp);
    }

}

d、在jsp页面中写一个超链接，用于向servlet提交get请求，调用doget方法

<h1>hello21312124</h1>
<a href="TestServlet">testservlet</a>

e、结果