[JSP] Spring依赖注入的三种方式实例详解

package com.spring.test.di;
public interface Logic {
public String getName();
}

package com.spring.test.di;
public class LogicImpl implements Logic{
public String getName(){
  return "fengyun";
}
}

package com.spring.test.di;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.FileSystemXmlApplicationContext;
public class TestMain {
/**
 * @param args
 */
public static void main(String[] args) {

  // 得到ApplicationContext对象
  ApplicationContext ctx = new FileSystemXmlApplicationContext(
   "applicationContext.xml");
  // 得到Bean
  LoginAction loginAction = (LoginAction) ctx.getBean("loginAction");

  loginAction.execute();
}
}

package com.spring.test.di;
public class LoginAction {
private Logic logic;

public void execute() {
  String name = logic.getName();
  System.out.print("My Name Is " + name); 
}

/**
 * @return the logic
 */
public Logic getLogic() {
  return logic;
}

/**
 * @param logic
 *    the logic to set
 */
public void setLogic(Logic logic) {
  this.logic = logic;
}
}

package com.spring.test.di;
public class LoginAction {
private Logic logic;

public LoginAction(Logic logic) {
  this.logic = logic;
}

public void execute() {
  String name = logic.getName();
  System.out.print("My Name Is " + name);
}
}

package com.spring.test.di;
public class LoginAction {
private Logic logic;

public void execute() {
  try {
  Object obj = Class.forName("com.spring.test.di.LogicImpl")
     .newInstance();
  logic = (Logic) obj;
  String name = logic.getName();
  System.out.print("My Name Is " + name);
  } catch (Exception e) {
  e.printStackTrace();
  }
}
}