src/cn/itbaizhan/action/UserAction.java

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package cn.itbaizhan.action;

import java.util.Collection;
import java.util.Map;

import javax.annotation.Resource;

import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Component;

import cn.itbaizhan.po.User;
import cn.itbaizhan.service.UserService;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

//import com.cds.po.Department;
//import com.cds.po.Role;

//import com.cds.service.DepartmentService;
//import com.cds.service.RoleService;

@SuppressWarnings("serial")
@Component("userAction")
@Scope("prototype")//多例，每个请求生成一个新的action
public class UserAction extends ActionSupport {
	private User user;
    //要调用UserService的方法，所以要声明,让spring把其实现类注入。@Resource 默认按 byName 自动注入
	@Resource(name="userServiceImpl")
	UserService service;
	public UserService getService() {
		return service;
	}

	public void setService(UserService service) {
		this.service = service;
	}

	public User getUser() {
		return user;
	}

	public void setUser(User user) {
		this.user = user;
	}
	

	@Override
	public String execute() throws Exception {
		// 不要直接访问数据库，应该访问业务逻辑层service，而service去访问DAO，dao去访问数据库
		String username= user.getUsername();
		System.out.println(username);
		
		User user = service.findUserByName(username);
		if(user==null){
			this.service.save(this.user);
			return "success";
		}
		else{
			return "error";