Spring使用@AutoWired自動裝配redisTemplate時的一個細節

阿新 • • 發佈：2021-07-12

今天引入了redis，起先在測試redis工具類的時候報了template未初始化的錯誤，提示我應當先呼叫 afterPropertiesSet() 方法

java.lang.IllegalArgumentException: template not initialized; call afterPropertiesSet() before using it

    at org.springframework.util.Assert.isTrue(Assert.java:92)
    at org.springframework.data.redis.core.RedisTemplate.execute(RedisTemplate.java: 
183)
    at org.springframework.data.redis.core.RedisTemplate.execute(RedisTemplate.java:169)
    at org.springframework.data.redis.core.AbstractOperations.execute(AbstractOperations.java:91)
    at org.springframework.data.redis.core.DefaultValueOperations.get(DefaultValueOperations.java:43)
    at cn.hy.regRecord.utils.RedisUtils.get(RedisUtils.java: 
94)
    at cn.hy.regRecord.test.TestOthers.testRedis(TestOthers.java:97)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java: 
43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:69)
    at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)
    at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:221)
    at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:54)

template not initialized

在查資（bai）料（du）得知RedisTemplate 如果是手動new了一個物件的話那就應該 afterPropertiesSet() 方法，

要麼就使用@AutoWired註解自動裝配RedisTemplate 物件，但是更改之後報了下面這個異常

java.lang.NullPointerException
    at cn.hy.regRecord.utils.RedisUtils.get(RedisUtils.java:94)
    at cn.hy.regRecord.test.TestOthers.testRedis(TestOthers.java:97)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:69)
    at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)
    at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:221)
    at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:54)

報錯資訊

原因是我這段程式碼是在Junit環境測試的，測試環境如果要用到自動裝配應當在類之前加上@RunWith(SpringRunner.class)

 1 @RunWith(SpringRunner.class)
 2 @WebAppConfiguration //使用此註解後可通過AutoWired裝配IOC容器本身
 3 @ContextConfiguration(locations = {"classpath:applicationContext.xml", "classpath:dispatcherServlet-servlet.xml"})
 4 public class TestRedis {
 5     @Autowired
 6     RedisTemplate redisTemplate;
 7     @Test
 8     public void testRedis() {
 9         RedisUtils redisUtils = new RedisUtils(redisTemplate);
10         redisUtils.set("code", "123456", 12000);
11         System.out.println("服務正在執行: "+redisUtils.get("code"));
12     }
13 }