解决静态utils里面注入mapper对象

项目中需要在一个utils工具类中，调用mapper对象来进行功能实现，然而静态方法里面直接注入会报空指针的错误，网上查了一些资料得出如下解决办法

重点步骤：

1，utils类上面添加@Component注解

2，@Autowired注入需要使用的mapper对象，注意不是静态的

3，创建一个静态的这个utils的对象   private static LayoutNumUtils layoutNumUtils;

4，创建一个init方法，添加@PostConstruct注解，方法内容如下

OK，在接下来的调用中，使用utils的对象来调用对应的mapper对象layoutNumUtils.busiTabLayoutMapper.selectByTabId(tabId);

1. <span style="font-size:18px;">@Component
2. public class LayoutNumUtils {
3. @Autowired
4. private  BusiTabMapper busiTabMapper;
5. @Autowired
6. private  BusiTabLayoutMapper busiTabLayoutMapper;
7. private static LayoutNumUtils layoutNumUtils;
8. @PostConstruct
9. public void init(){
10. layoutNumUtils = this;
11. layoutNumUtils.busiTabMapper = this.busiTabMapper;
12. layoutNumUtils.busiTabLayoutMapper = this.busiTabLayoutMapper;
13. }
14. public static void layoutTypeCheck(Integer tabId){
15. try {
16. List<BusiTabLayout> list = layoutNumUtils.busiTabLayoutMapper.selectByTabId(tabId);</span>

@Component
public class LayoutNumUtils {

@Autowired</br>
private  BusiTabMapper busiTabMapper;</br>
@Autowired</br>
private  BusiTabLayoutMapper busiTabLayoutMapper;</br></br>
private static LayoutNumUtils layoutNumUtils;</br></br>
@PostConstruct</br>
public void init(){</br>
	layoutNumUtils = this;</br>
	layoutNumUtils.busiTabMapper = this.busiTabMapper;</br>
	layoutNumUtils.busiTabLayoutMapper = this.busiTabLayoutMapper;</br>
}</br></br>
public static void layoutTypeCheck(Integer tabId){</br>
	try {</br>
		List&lt;BusiTabLayout&gt; list = layoutNumUtils.busiTabLayoutMapper.selectByTabId(tabId);</span></pre><span style="font-size:18px;"><br><br></span></br>