Spring根据XML配置文件注入属性的方法

package com.swift;public class Book { private String bookName; public void setBook(String bookName) {  this.bookName = bookName; } @Override public String toString() {  return "Book [book=" + bookName + "]"; }}

<?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"><!-- IoC 控制反转 SpringSpring根据XML配置文件注入属性 --><bean id="book" class="com.swift.Book"><property name="bookName" value="三体——黑暗森林"></property></bean></beans>

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("/book")public class BookServlet extends HttpServlet { private static final long serialVersionUID = 1L; public BookServlet() {  super(); } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {  response.setCharacterEncoding("utf-8");  response.setContentType("text/html;charset=utf-8");  response.getWriter().append("Served at: ").append(request.getContextPath());  @SuppressWarnings("resource")  //就是下边这几句了  ApplicationContext context=new ClassPathXmlApplicationContext("a.xml");  Book book=(Book) context.getBean("book");  String bookInfo=book.fun();  response.getWriter().println();  response.getWriter().append(bookInfo); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {  doGet(request, response); }}