Spring注入service为null另类解决办法工具类一般类静态非controller

客官°小女子只卖身不卖艺 2023-10-17 09:07 153阅读 0赞

本文转载自：[http://www.cnblogs.com/allforone/p/4108862.html][http_www.cnblogs.com_allforone_p_4108862.html]

系统为SpringMVC框架，在开发的过程中有一些工具类需要调用下由spring管理的service层。但是一进注入不进来，报null异常；

在尝试了网上的一系列方法后，还是没有解决。网上的解决方法主要有以下几种：

1、将工具类申明为spring组件，如@controller @compent 等，在spring自动扫描包设置中将工具类所在的包加进来； 无效

2、new一个service； 无效 而且不符合spring管理；

山穷水尽后，找到了一个另类的解决办法，代码原理还不太清楚，只是大概猜测下，有错误的地方，大家留言指正：

1.  @Component //申明为spring组件
2.  public class TestUtils \{ 
3.  
4.  @Autowired 
5.  private TestService testService; //添加所需service的私有成员
6.  private static TestUtils testUtils ; // 关键点1 静态初使化 一个工具类 这样是为了在spring初使化之前
7.  
8.  public void setTestService(TestService testService) \{ 
9.  this.testService = testService; 
10.  \} 
11. 
12. @PostConstruct //关键二 [通过@PostConstruct 和 @PreDestroy 方法 实现初始化和销毁bean之前进行的操作][PostConstruct _ _PreDestroy _ _bean]
13. public void init() \{ 
14.  testUtils = this; 
15.  testUtils.testService = this.testService; // 初使化时将已静态化的testService实例化
16.  \}

这样下面的代码中就可以通过 testUtils.testService 来调用service处理

实例代码

package com.common.common.util.model;
    
    import java.util.Date;
    import java.util.HashMap;
    import java.util.List;
    import java.util.Map;
    
    import javax.annotation.PostConstruct;
    import javax.annotation.Resource;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Component;
    
    import com.alibaba.fastjson.JSONObject;
    import com.common.common.util.BaseGateWay;
    import com.common.common.util.SpringContextUtil;
    import com.smart.entity.HomeDevice;
    import com.smart.entity.HomeDeviceAttrStatu;
    import com.smart.entity.HomeDeviceCommand;
    import com.smart.entity.HomeDeviceLog;
    import com.smart.entity.HomeGateway;
    import com.smart.service.IHomeDeviceAttrStatuService;
    import com.smart.service.IHomeDeviceLogService;
    import com.smart.service.IHomeDeviceService;
    import com.smart.service.IHomeGatewayService;
    //网格报警器
    @Component
    public class GridAlarm implements BaseGateWay {
    	@Autowired
    	private IHomeDeviceService homeDeviceService ;	
    	@Autowired
    	private IHomeDeviceLogService deviceLogService;
    	@Autowired
    	private IHomeDeviceAttrStatuService deviceAttrStatuService;
    	@Autowired
    	private IHomeGatewayService gatewayService; 
    	
    	private static GridAlarm  util;
    
    	public void setHomeDeviceService(IHomeDeviceService homeDeviceService) {
    		this.homeDeviceService = homeDeviceService;
    	}
    	public void setDeviceLogService(IHomeDeviceLogService deviceLogService) {
    		this.deviceLogService = deviceLogService;
    	}
    	public void setDeviceAttrStatuService(
    			IHomeDeviceAttrStatuService deviceAttrStatuService) {
    		this.deviceAttrStatuService = deviceAttrStatuService;
    	}
    	public void setGatewayService(IHomeGatewayService gatewayService) {
    		this.gatewayService = gatewayService;
    	}
    	
    	@PostConstruct
    	public void init(){
    		util =this;
    		util.deviceAttrStatuService = this.deviceAttrStatuService;
    		util.deviceLogService = this.deviceLogService;
    		util.gatewayService = this.gatewayService;
    		util.homeDeviceService = this.homeDeviceService;
    	}
    
    
    
    	@Override
    	public HomeDeviceCommand getHomeDeviceCommand(Map<String, Object> services) {
    		// TODO Auto-generated method stub
    		HomeDeviceCommand devCommandObj = new HomeDeviceCommand();
    		String command_type =" ";
    		String command_code =" ";
    		String comand =" ";
    		if(services.get("infrared_alarm")!=null){
    			//能力代码
    			command_type = "infrared_alarm";
    			//特征值代码
    			command_code = "alarm";
    			//更新网关布防状态
    			Map map = (Map)services.get(command_type);
    			comand = map.get(command_code).toString();
    			//不发短信
    			//issms = 0;
    		}
    		if(services.get("smoke_alarm")!=null){
    			//能力代码
    			command_type = "smoke_alarm";
    			//特征值代码
    			command_code = "alarm";
    			//更新网关布防状态
    			Map map = (Map)services.get(command_type);
    			comand = map.get(command_code).toString();
    			//不发短信
    			//issms = 0;
    		}
    		if(services.get("alarm_switch")!=null){
    			//能力代码
    			command_type = "alarm_switch";
    			//特征值代码
    			command_code = "on_off";
    			//更新网关布防状态
    			Map map = (Map)services.get(command_type);
    			comand = map.get(command_code).toString();
    		}		
    		devCommandObj.setCommand(comand);
    		devCommandObj.setCommandType(command_type);
    		devCommandObj.setCommandCode(command_code);
    		return devCommandObj;
    	}
    
    	
    
    	@Override
    	public void proceNotice(Map<String, Object> services,
    			List<HomeGateway> gatewayList, int gateway_id, String device_id_,
    			Integer device_code_, String gateway_uid, HomeDevice device_,
    			Integer device_type) {
    		// TODO Auto-generated method stub
    		if(services.get("operation_status")!=null){
    			Map map = (Map)services.get("operation_status");
    			if(gatewayList != null && gatewayList.size()>0){
    				if((int)map.get("status")==1){
    					this.UpdateRestOnLineDevice(gateway_id, device_id_, 1);
    				}else if((int)map.get("status")==-1){
    					//删除该子设备
    					Map<String, Object> maps = new HashMap<String, Object>();
    					maps.put("device_uid", device_id_);
    					maps.put("gateway_uid", gateway_uid);
    					maps.put("gateway_id", gateway_id);
    
    					util.homeDeviceService.deleteDeviceByUId(maps);
    				}else{
    					System.out.println("1234");
    					this.UpdateOffLineDevice(gateway_id, device_id_, 1);
    				}
    			}
    		}
    		if(services.get("alarm_switch")!=null){
    			//能力代码
    			String command_type = "alarm_switch";
    			//特征值代码
    			String command_code = "on_off";
    			//更新网关布防状态
    			Map map = (Map)services.get(command_type);
    			String comand = map.get(command_code).toString();
    
    			String desc = "布防";
    			if(comand.equals("0")){
    				desc = "撤防";
    			}
    			//保存日志
    			this.SaveDeviceLog(gateway_id, device_.getId(), comand, desc,gateway_uid,device_.getDeviceUid(),device_.getDeviceName());
    
    			this.SaveAlarmAttrStatus(device_.getId(), device_code_,command_type, command_code, comand, desc);
    
    			if(device_id_.equals(gateway_uid)&&device_code_ == device_type){
    				//网关修改布防撤防状态
    				Map<String,Object> maps = new HashMap<String,Object>();
    				int stat = 1;
    				if(Integer.parseInt(comand) == 0){
    					stat = 0;
    				}
    				maps.put("status", stat);
    				maps.put("gateway_uid", gateway_uid);
    				util.gatewayService.updateGatewayStatus(maps);
    			}
    		}
    		
    		if(services.get("auto_alarm_time")!=null){	//定时警戒
    			//能力代码
    			String command_type = "auto_alarm_time";
    			//特征值代码
    			String command_code = "";
    
    			//更新网关布防状态
    			Map map = (Map)services.get(command_type);
    
    			String comand = JSONObject.toJSONString(map);
    			//保存日志
    			this.SaveDeviceLog(gateway_id, device_.getId(), command_type, comand,gateway_uid,device_.getDeviceUid(),device_.getDeviceName());
    
    			this.SaveAlarmAttrStatus(device_.getId(), device_code_,command_type, command_code, comand, "警戒时间");
    		}
    		
    		
    		
    		
    		
    	}
    	
    		//更新重新上线设备状态
    		private void UpdateRestOnLineDevice(int gatewayId,String deviceId,Integer typeCode) {
    			HomeDevice restOnLineDevObj = new HomeDevice();
    			restOnLineDevObj.setGatewayId(gatewayId);
    			restOnLineDevObj.setTypeCode(typeCode);
    			restOnLineDevObj.setDeviceUid(deviceId);
    			restOnLineDevObj.setStatus("1");
    			restOnLineDevObj.setUpTime(new Date());
    			util.homeDeviceService.updateDeviceOffLine(restOnLineDevObj);//更新重新上线设备状态
    		}
    		//更新掉线设备状态
    		private void UpdateOffLineDevice(int gatewayId,String deviceId,Integer typeCode) {
    			HomeDevice offLineDevObj = new HomeDevice();
    			offLineDevObj.setGatewayId(gatewayId);
    			offLineDevObj.setTypeCode(typeCode);
    			offLineDevObj.setDeviceUid(deviceId);
    			offLineDevObj.setStatus("0");
    			offLineDevObj.setUpTime(new Date());
    			util.homeDeviceService.updateDeviceOffLine(offLineDevObj);//更新掉线设备状态
    		}
    		
    		//保存设备日志
    		private void SaveDeviceLog(int gatewayId,int deviceId,String command,String commandDesc,String gatewayUid,String deviceUid,String deviceName) {
    			//日志
    			//"type_code":"0103","device_uid":"3"
    			HomeDeviceLog devLogObj = new HomeDeviceLog();
    			devLogObj.setGatewayUid(gatewayUid);
    			devLogObj.setDeviceUid(deviceUid);
    			devLogObj.setDeviceName(deviceName);
    			devLogObj.setGatewayId(gatewayId);
    			devLogObj.setDeviceId(deviceId);
    			devLogObj.setMsgType("log");
    			devLogObj.setMsgCommand(command);
    			devLogObj.setMsgContent(commandDesc);
    			devLogObj.setCreatedTime(new Date());
    			devLogObj.setUpTime(new Date());
    			devLogObj.setDelFlag(0);
    			util.deviceLogService.insertDeviceLog(devLogObj);
    		}
    		
    		//保存设备上报上来属性
    		public void SaveAlarmAttrStatus(int device_id,Integer type_code,String command_type,String command_code,String comand,String command_desc){
    
    			//保存到设备属性表中
    			HomeDeviceAttrStatu record = new HomeDeviceAttrStatu();
    			record.setDeviceId(device_id);
    			record.setTypeCode(type_code);
    			record.setCommandType(command_type);
    			record.setCommandCode(command_code);
    			record.setComand(comand);
    			record.setComandDesc(command_desc);
    			record.setCreatedTime(new Date());
    			record.setUpTime(new Date());
    			record.setDelFlag(0);
    
    			if(util.deviceAttrStatuService.selectExistsDeviceAttr(record)>0){
    				util.deviceAttrStatuService.updateDeviceAttr(record);
    			}else{
    				util.deviceAttrStatuService.insertDeviceAttr(record);
    			}	
    		}
    
    }

[http_www.cnblogs.com_allforone_p_4108862.html]: http://www.cnblogs.com/allforone/p/4108862.html
[PostConstruct _ _PreDestroy _ _bean]: http://write.blog.csdn.net/postedit/8681497