方法一使用setter方法
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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類中不能直接生成Book類的對象，并注入String bookName的屬性值
而需要通過配置文件xml的方法
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<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans" 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配置文件注入屬性 --><bean id="book" class="com.swift.Book"><property name="bookName" value="三體——黑暗森林"></property></bean></beans> |
Servlet類代碼：
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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") //就是下邊這幾句了 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); }} |
注意
beans 、context、core 和expression核心jar包
以及commons-logging 和log4j兩個jar包不要缺少
方法二使用有參構造方法
以上這篇Spring根據XML配置文件注入屬性的方法就是小編分享給大家的全部內容了，希望能給大家一個參考，也希望大家多多支持服務器之家。
原文鏈接：http://www.cnblogs.com/qingyundian/archive/2017/11/12/7823471.html
