Spring入门(配置文件方式)

一 概述

二.代码

1.导入jar包

2.src（类路径）下创建配置文件applicationContext.xml

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
    xmlns:c="http://www.springframework.org/schema/c"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">


    <bean id="helloJava" class="com.blueSky.test.HelloJava">
        <property name="content" value="你好，java" />
    bean>
    <bean id="helloWorld" class="com.blueSky.test.HelloWorld">
        <property name="content" value="你好，世界" />
        <property name="helloJava" ref="helloJava">property>
    bean>

beans>

3.编写java类

package com.blueSky.test;

public class HelloJava {
    private String content;

    public String getContent() {
        return content;
    }

    public void setContent(String content) {
        this.content = content;
    }


}

package com.blueSky.test;

public class HelloWorld {
    private String content; //输出的内容
    private HelloJava helloJava;

    public HelloJava getHelloJava() {
        return helloJava;
    }

    public void setHelloJava(HelloJava helloJava) {
        this.helloJava = helloJava;
    }

    public String getContent() {
        return content;
    }

    public void setContent(String content) {
        this.content = content;
    }

    /*
     * 输出content 和 helloJava对象的content
     * */
    public void printContent(){
        System.out.println(content);
        System.out.println(helloJava.getContent());
    }
}

4.applicationContext.xml文件中配置< bean >标签

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
    xmlns:c="http://www.springframework.org/schema/c"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">


    <bean id="helloJava" class="com.blueSky.test.HelloJava">
        <property name="content" value="你好，java" />
    bean>
    <bean id="helloWorld" class="com.blueSky.test.HelloWorld">
        <property name="content" value="你好，世界" />
        <property name="helloJava" ref="helloJava">property>
    bean>

beans>

5.测试

package test;

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.blueSky.test.HelloWorld;

public class SpringTest {

    @Test
    public void test1() {
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        HelloWorld helloWorld = (HelloWorld) context.getBean("helloWorld");
        helloWorld.printContent();
    }
}

6.错误分析

web.xml配置

<context-param>
        <param-name>contextConfigLocationparam-name>
        <param-value>classpath:applicationContext.xmlparam-value>
    context-param>

    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListenerlistener-class>
    listener>