Spring根据XML配置文件注入属性的方法

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

xmlns:xsi="http://w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="

http://springframework.org/schema/beans http://springframework.org/schema/beans/spring-beans.xsd">

xmlns:xsi="http://w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="

http://springframework.org/schema/beans http://springframework.org/schema/beans/spring-beans.xsd">

Servlet类代码：

package com.swift;

import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.sehttp://rvlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequeshttp://t;

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);

}

}

注意

beans 、context、core 和expression核心jar包

以及commons-logging 和log4j两个jar包不要缺少

方法二使用有参构造方法

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