要生成對象並通過名稱空間註入屬性的類 代碼如下：

package com.swift;

public class User {
    private String userName;
    
    public void setUserName(String userName) {
        this.userName = userName;
    }
    public String fun() {
        return "User‘s fun is ready."+this.userName;
    }
}

XML配置文件寫法如下：

<?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:p="http://www.springframework.org/schema/p"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
<!--
 
 IoC 控制反轉 SpringSpring根據XML配置文件生成對象 -->
<bean id="user" class="com.swift.User" p:userName="peach"></bean>
</beans>

p:userName="peach"
p:後是屬性的變量名 後面是賦值
約束是xmlns:p="http://www.springframework.org/schema/p"

生成對象及屬性值調用方法，代碼如下：

package com.swift;

import java.io.IOException;
import javax.servlet.ServletException;
 
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

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

@WebServlet("/test")
public class TestIOC extends HttpServlet {
    private static final long serialVersionUID = 1L;
    public TestIOC() {
        super();
    }
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.getWriter().append("Served at: ").append(request.getContextPath());
        @SuppressWarnings("resource")
        //就是下邊這幾句了
        ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml");
        User user=(User) context.getBean("user");
        String userInfo=user.fun();
        response.getWriter().println();
        response.getWriter().append(userInfo);
    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);
    }

}

Spring根據XML配置文件 p名稱空間註入屬性