Spring根据XML配置文件注入属性的方法

方法一使用setter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 + "]";

									 }

									}

在Spring框架中，假定Servlet类中不能直接生成Book类的对象，并注入String bookName的属性值

而需要通过配置文件xml的方法

									<?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>

Servlet类代码：

									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);

									 }

									}