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);
 }

}

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

以上这篇spring根据xml配置文件注入属性的方法就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持。