SpringBoot中Service实现类添加@Service却任然无法注入的问题
最近一直在研究Spring Boot。从GitHub上下载了一个my-Blog源码,一边看,一边自己尝试去实现,结果掉在坑了,研究了近一周才爬出来,特地来这博客园记录下来,一是避免自己在放这样的错误,二是希望看到的朋友能有所帮助,毕竟我在网上查了很多资料,答案基本上千篇一律,并不能解决我的问题。
先说问题:我在Controller层中引用Service层的实现类,报错,错误代码如下:
-- ::45.094 ERROR --- [nio--exec-] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.example.mydemo.service.AdminUserService.login] with root cause org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.example.mydemo.service.AdminUserService.login
at org.apache.ibatis.binding.MapperMethod$SqlCommand.<init>(MapperMethod.java:) ~[mybatis-3.5..jar:3.5.]
at org.apache.ibatis.binding.MapperMethod.<init>(MapperMethod.java:) ~[mybatis-3.5..jar:3.5.]
at org.apache.ibatis.binding.MapperProxy.lambda$cachedInvoker$(MapperProxy.java:) ~[mybatis-3.5..jar:3.5.]
at java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:) ~[na:1.8.0_151]
at org.apache.ibatis.binding.MapperProxy.cachedInvoker(MapperProxy.java:) ~[mybatis-3.5..jar:3.5.]
at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:) ~[mybatis-3.5..jar:3.5.]
at com.sun.proxy.$Proxy66.login(Unknown Source) ~[na:na]
at com.example.mydemo.controller.admin.AdminController.login(AdminController.java:) ~[classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_151]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:) ~[na:1.8.0_151]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:) ~[na:1.8.0_151]
at java.lang.reflect.Method.invoke(Method.java:) ~[na:1.8.0_151]
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:) ~[spring-web-5.1..RELEASE.jar:5.1..RELEASE]
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:) ~[spring-web-5.1..RELEASE.jar:5.1..RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:) ~[spring-webmvc-5.1..RELEASE.jar:5.1..RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:) ~[spring-webmvc-5.1..RELEASE.jar:5.1..RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:) ~[spring-webmvc-5.1..RELEASE.jar:5.1..RELEASE]
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:) ~[spring-webmvc-5.1..RELEASE.jar:5.1..RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:) ~[spring-webmvc-5.1..RELEASE.jar:5.1..RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:) ~[spring-webmvc-5.1..RELEASE.jar:5.1..RELEASE]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:) ~[spring-webmvc-5.1..RELEASE.jar:5.1..RELEASE]
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:) ~[spring-webmvc-5.1..RELEASE.jar:5.1..RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:) ~[tomcat-embed-core-9.0..jar:9.0.]
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:) ~[spring-webmvc-5.1..RELEASE.jar:5.1..RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:) ~[tomcat-embed-core-9.0..jar:9.0.]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:) ~[tomcat-embed-core-9.0..jar:9.0.]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:) ~[tomcat-embed-core-9.0..jar:9.0.]
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:) ~[tomcat-embed-websocket-9.0..jar:9.0.]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:) ~[tomcat-embed-core-9.0..jar:9.0.]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:) ~[tomcat-embed-core-9.0..jar:9.0.]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:) ~[spring-web-5.1..RELEASE.jar:5.1..RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:) ~[spring-web-5.1..RELEASE.jar:5.1..RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:) ~[tomcat-embed-core-9.0..jar:9.0.]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:) ~[tomcat-embed-core-9.0..jar:9.0.]
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:) ~[spring-web-5.1..RELEASE.jar:5.1..RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:) ~[spring-web-5.1..RELEASE.jar:5.1..RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:) ~[tomcat-embed-core-9.0..jar:9.0.]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:) ~[tomcat-embed-core-9.0..jar:9.0.]
at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:) ~[spring-web-5.1..RELEASE.jar:5.1..RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:) ~[spring-web-5.1..RELEASE.jar:5.1..RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:) ~[tomcat-embed-core-9.0..jar:9.0.]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:) ~[tomcat-embed-core-9.0..jar:9.0.]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:) ~[spring-web-5.1..RELEASE.jar:5.1..RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:) ~[spring-web-5.1..RELEASE.jar:5.1..RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:) ~[tomcat-embed-core-9.0..jar:9.0.]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:) ~[tomcat-embed-core-9.0..jar:9.0.]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:) ~[tomcat-embed-core-9.0..jar:9.0.]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:) [tomcat-embed-core-9.0..jar:9.0.]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:) [tomcat-embed-core-9.0..jar:9.0.]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:) [tomcat-embed-core-9.0..jar:9.0.]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:) [tomcat-embed-core-9.0..jar:9.0.]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:) [tomcat-embed-core-9.0..jar:9.0.]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:) [tomcat-embed-core-9.0..jar:9.0.]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:) [tomcat-embed-core-9.0..jar:9.0.]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:) [tomcat-embed-core-9.0..jar:9.0.]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:) [tomcat-embed-core-9.0..jar:9.0.]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:) [tomcat-embed-core-9.0..jar:9.0.]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:) [tomcat-embed-core-9.0..jar:9.0.]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:) [na:1.8.0_151]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:) [na:1.8.0_151]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:) [tomcat-embed-core-9.0..jar:9.0.]
at java.lang.Thread.run(Thread.java:) [na:1.8.0_151]
总的来说就是绑定语句无效,并未找到 com.example.mydemo.service.AdminUserService.login此方法。我从网上百度一下,看到大多数都是再讲Mapper.xml设置错误导致,需要排查:
- 检查xml文件所在package名称是否和Mapper interface所在的包名一一对应;
- 检查xml的namespace是否和xml文件的package名称一一对应;
- 检查方法名称是否对应;
但我看了很多遍,我的程序都没有这些问题,并且我在Test中测试Mapper时可以用的。
@SpringBootTest
class MydemoApplicationTests {
@Autowired
AdminUserMapper adminUserMapper;
@Resource
TestService testService;
@Test
void TestInsert(){
AdminUser adminUser =new AdminUser();
adminUser.setAdminUserId(5);
adminUser.setLocked(Byte.parseByte("1"));
adminUser.setLoginPassword("123");
adminUser.setLoginUserName("zzc");
adminUser.setNickName("BigBang");
adminUserMapper.insert(adminUser);
}
@Test
void get(){
AdminUser get= adminUserMapper.login("zzc","123");
System.out.println(get);
} @Test
void TestMyService(){
testService.Test();
}
}
-- ::08.234 INFO --- [ main] c.example.mydemo.MydemoApplicationTests : Starting MydemoApplicationTests on LAPTOP-MFBL0MLV with PID (started by zc in D:\Lab_Java\Demo)
-- ::08.236 INFO --- [ main] c.example.mydemo.MydemoApplicationTests : No active profile set, falling back to default profiles: default
-- ::10.117 INFO --- [ main] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor'
-- ::10.814 INFO --- [ main] c.example.mydemo.MydemoApplicationTests : Started MydemoApplicationTests in 2.776 seconds (JVM running for 4.072)
-- ::11.102 INFO --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool- - Starting...
-- ::11.287 INFO --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool- - Start completed.
AdminUser{adminUserId=, loginUserName='zzc', loginPassword='', nickName='BigBang', locked=}
-- ::11.356 INFO --- [ Thread-] o.s.s.concurrent.ThreadPoolTaskExecutor : Shutting down ExecutorService 'applicationTaskExecutor'
-- ::11.357 INFO --- [ Thread-] com.zaxxer.hikari.HikariDataSource : HikariPool- - Shutdown initiated...
-- ::11.359 INFO --- [ Thread-] com.zaxxer.hikari.HikariDataSource : HikariPool- - Shutdown completed. Process finished with exit code
可以看到get()方法是可以使用adminUserMapper的,也就是说Mapper的注入是没有问题的。此外还写了一个TestService,里面不涉及任何Mapper相关的东西,还是报这个错误。也就是说我的问题原因和Mapper并没有关系,至少不是上述这三点导致的。
问题还是出现再Service层里,我的Service层代码如下:
package com.example.mydemo.service; import com.example.mydemo.entity.AdminUser; public interface AdminUserService { AdminUser login(String userName, String password); /**
* 获取用户信息
*
* @param loginUserId
* @return
*/
AdminUser getUserDetailById(Integer loginUserId); /**
* 修改当前登录用户的密码
*
* @param loginUserId
* @param originalPassword
* @param newPassword
* @return
*/
Boolean updatePassword(Integer loginUserId, String originalPassword, String newPassword); /**
* 修改当前登录用户的名称信息
*
* @param loginUserId
* @param loginUserName
* @param nickName
* @return
*/
Boolean updateName(Integer loginUserId, String loginUserName, String nickName);
}
package com.example.mydemo.service.impl; import com.example.mydemo.dao.AdminUserMapper;
import com.example.mydemo.entity.AdminUser;
import com.example.mydemo.service.AdminUserService;
import com.example.mydemo.util.MD5Util;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service; import javax.annotation.Resource; @Service
public class AdminUserServiceImpl implements AdminUserService { @Resource
private AdminUserMapper adminUserMapper; @Override
public AdminUser login(String userName, String password) {
String passwordMd5 = MD5Util.MD5Encode(password, "UTF-8");
System.out.println("Md5:"+passwordMd5);
return adminUserMapper.login(userName, passwordMd5);
} @Override
public AdminUser getUserDetailById(Integer loginUserId) {
return adminUserMapper.selectByPrimaryKey(loginUserId);
} @Override
public Boolean updatePassword(Integer loginUserId, String originalPassword, String newPassword) {
AdminUser adminUser = adminUserMapper.selectByPrimaryKey(loginUserId);
//当前用户非空才可以进行更改
if (adminUser != null) {
String originalPasswordMd5 = MD5Util.MD5Encode(originalPassword, "UTF-8");
String newPasswordMd5 = MD5Util.MD5Encode(newPassword, "UTF-8");
//比较原密码是否正确
if (originalPasswordMd5.equals(adminUser.getLoginPassword())) {
//设置新密码并修改
adminUser.setLoginPassword(newPasswordMd5);
if (adminUserMapper.updateByPrimaryKeySelective(adminUser) > 0) {
//修改成功则返回true
return true;
}
}
}
return false;
} @Override
public Boolean updateName(Integer loginUserId, String loginUserName, String nickName) {
AdminUser adminUser = adminUserMapper.selectByPrimaryKey(loginUserId);
//当前用户非空才可以进行更改
if (adminUser != null) {
//设置新密码并修改
adminUser.setLoginUserName(loginUserName);
adminUser.setNickName(nickName);
if (adminUserMapper.updateByPrimaryKeySelective(adminUser) > 0) {
//修改成功则返回true
return true;
}
}
return false;
} }
controller层中的调用如下:
package com.example.mydemo.controller.admin; import com.example.mydemo.entity.AdminUser;
import com.example.mydemo.service.AdminUserService;
import org.springframework.stereotype.Controller;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.annotation.*; import javax.annotation.Resource;
import javax.servlet.http.HttpSession; @Controller
@RequestMapping("/admin") public class AdminController {
@Resource
private AdminUserService adminUserService; @GetMapping({"/login"})
public String login() { return "admin/login";
} @PostMapping(value = "/login")
public String login(@RequestParam("userName") String userName,
@RequestParam("password") String password,
@RequestParam("verifyCode") String verifyCode,
HttpSession session){
if (StringUtils.isEmpty(verifyCode)) {
session.setAttribute("errorMsg", "验证码不能为空");
return "admin/login";
}
if (StringUtils.isEmpty(userName) || StringUtils.isEmpty(password)) {
session.setAttribute("errorMsg", "用户名或密码不能为空");
return "admin/login";
}
String kaptchaCode = session.getAttribute("verifyCode") + "";
if (StringUtils.isEmpty(kaptchaCode) || !verifyCode.equals(kaptchaCode)) {
session.setAttribute("errorMsg", "验证码错误");
return "admin/login";
}
AdminUser adminUser = adminUserService.login(userName, password);
if (adminUser != null) {
session.setAttribute("loginUser", adminUser.getNickName());
session.setAttribute("loginUserId", adminUser.getAdminUserId());
//session过期时间设置为7200秒 即两小时
//session.setMaxInactiveInterval(60 * 60 * 2);
return "redirect:/admin/index";
} else {
session.setAttribute("errorMsg", "登陆失败");
return "admin/login";
} } }
package com.example.mydemo; import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication
@MapperScan("com.example.mydemo") public class MydemoApplication { public static void main(String[] args) {
SpringApplication.run(MydemoApplication.class, args);
}
}
在网上查资料,发现有人说如果Application类包所在的位置也很关键,SpringBoot项目的Bean装配默认规则是根据Application类所在的包位置从上往下扫描!Application类是指SpringBoot项目入口类。也就是我的Service层所在的包必须在com.example.mydemo或其子包下,否则Service层中的Bean不会被扫描到,但我的程序也满足啊。
结果就在这里思索了一周都没有一点进展,直到一天我发现我的@MapperScan扫描的路径是"com.example.mydemo"。WTF!!!
我又赶快上网查了一下@MapperScan注解
作用:指定要变成实现类的接口所在的包,然后包下面的所有接口在编译之后都会生成相应的实现类
添加位置:是在Springboot启动类上面添加。
看到没,包下面所有的接口在编译后之后都会生成相应的实现类,也就是说除了我的AdminUserServiceImp外Spring Boot还注入了一个mapper实现类,当我在Controller中使用@AutoWired或@Resource获取时,获取到时这个Mapper实现类的实例,但实际上并没有真正继承AdminUserService接口,只有你在运行的时候服务器才会报错,找不到对应的方法。
于是我把Mapper扫描具体到DAO路径下,即:
package com.example.mydemo; import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication
@MapperScan("com.example.mydemo.dao") public class MydemoApplication { public static void main(String[] args) {
SpringApplication.run(MydemoApplication.class, args);
}
}
修改后果然不再报错。
其实这个错误说起来还是挺简单,主要时自己对Spring Boot的注解,一些基本知识还是不够了解导致,看来以后还是要继续夯实基础啊。
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