Spring根据XML配置文件 p名称空间注入属性的实例

2021-02-05 12:22Advancing-Swift JAVA教程

下面小编就为大家分享一篇Spring根据XML配置文件 p名称空间注入属性的实例，具有很好的参考价值。希望对大家有所帮助

要生成对象并通过名称空间注入属性的类 代码如下：

				?

									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配置文件写法如下：

				?

									<?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 控制反转 SpringSpring根据XML配置文件生成对象 -->

									<bean id="user" class="com.swift.User" p:userName="peach"></bean>

									</beans>

p:userName="peach"

p:后是属性的变量名后面是赋值

约束是xmlns:p="http://www.springframework.org/schema/p"

生成对象及属性值调用方法，代码如下：

				?

									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")

									  //就是下边这几句了

									  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);

									 }

									}