ssh action调用sevice层方法空指针状况
代码[code=Java][/code]package action;
import model.User;
import service.UserService;

import com.opensymphony.xwork2.ActionSupport;
import java.util.List;
@SuppressWarnings("serial")
public class UserAction extends ActionSupport{
private String password;
private List<User> userList;
private String username;
private UserService userService;
public String getPassword() {
return password;
}

public String getUsername() {
return username;
}
public UserService getUserService() {
return userService;
}
public String login(){
System.out.println(username);
userList=userService.Login(username, password);
if(userList.size()>0&&userList!=null){
return SUCCESS;
}
else{
return ERROR;
}
}
public void setPassword(String password) {
this.password = password;
}

public void setUsername(String username) {
this.username = username;
}
public void setUserService(UserService userService) {
this.userService = userService;
}

public void setUserList(List<User> userList) {
this.userList = userList;
}

public List<User> getUserList() {
return userList;
}
}

[code=Java][/code]package service.impl;
import java.util.List;
import javax.annotation.Resource;

import org.springframework.stereotype.Component;

import dao.UserDao;
import model.User;
import service.UserService;
@Component("userService")

public class UserServiceImpl implements UserService {

private UserDao userDao;
public List<User> Login(String name,String pwd) {
// TODO Auto-generated method stub
List<User> userList=userDao.findByNameAndPwd(name, pwd);
if(userList.size()>0&&userList!=null){
return userList;
}
else{
return null;
}
}
@Resource
public void setUserDao(UserDao userDao) {
this.userDao = userDao;
}
public UserDao getUserDao() {
return userDao;
}
public UserServiceImpl(){

}

}
[code=XML][/code]<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans
  http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
  http://www.springframework.org/schema/context
  http://www.springframework.org/schema/context/spring-context-2.5.xsd
  http://www.springframework.org/schema/aop
  http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
  http://www.springframework.org/schema/tx 
  http://www.springframework.org/schema/tx/spring-tx-2.5.xsd"
  default-autowire="byName"
  default-lazy-init="true"
  >

<context:annotation-config />
<context:component-scan base-package="com.rec" />
<bean
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="locations">
<value>classpath:jdbc.