SpringBoot服务开启后通过端口访问无反应的解决

SpringBoot入门Demo,一次深夜踩坑记录。

springboot小项目开启后，访问端口无反应。

首先看我的项目目录：

项目的pom文件内容如下：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>com.bes</groupId>
  <artifactId>spring-colud</artifactId>
  <version>1.0.0-SNAPSHOT</version>
  <modules>
    <module>user-service</module>
  </modules>
  <packaging>pom</packaging>

  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.0.4.RELEASE</version>
  </parent>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <java.version>1.8</java.version>
    <spring-cloud.version>Finchley.SR1</spring-cloud.version>
    <mapper.starter.version>2.0.3</mapper.starter.version>
    <mysql.version>5.1.32</mysql.version>
    <pageHelper.starter.version>1.2.5</pageHelper.starter.version>
  </properties>

  <dependencyManagement>
    <dependencies>
      <!-- springcloud -->
      <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-dependencies</artifactId>
        <version>${spring-cloud.version}</version>
      </dependency>

      <!-- 通用Mapper启动器 -->
      <dependency>
        <groupId>tk.mybatis</groupId>
        <artifactId>mapper-spring-boot-starter</artifactId>
        <version>${mapper.starter.version}</version>
      </dependency>

      <!-- 分页助手启动器 -->
      <dependency>
        <groupId>com.github.pagehelper</groupId>
        <artifactId>pagehelper-spring-boot-starter</artifactId>
        <version>${pageHelper.starter.version}</version>
      </dependency>

      <!-- mysql驱动 -->
      <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>${mysql.version}</version>
      </dependency>
    </dependencies>
  </dependencyManagement>

  <dependencies>
    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <version>1.18.4</version>
    </dependency>
  </dependencies>

  <build>
    <plugins>
      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
      </plugin>
    </plugins>
  </build>

</project>

我的application.yml配置为：

server:
port: 8081
spring:
datasource:
url: jdbc:mysql://localhost:3306/springboot
username: root
password: root
mybatis:
type-aliases-package: com.bes.user.domain

UserDao为

package com.bes.user.dao;

import com.bes.user.domain.User;
import org.springframework.stereotype.Repository;
import tk.mybatis.mapper.common.Mapper;

public interface UserDao extends Mapper<User> {
}

UserService为：

package com.bes.user.service;

import com.bes.user.dao.UserDao;
import com.bes.user.domain.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

@Service
@Transactional
public class UserService {
  @Autowired
  UserDao userDao;

  public User findById(Integer id) {
    User user = userDao.selectByPrimaryKey(id);
    return user;
  }
}

UserController为：

package com.bes.user.web;

import com.bes.user.domain.User;
import com.bes.user.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/user")
public class UserController {
  @Autowired
  UserService userService;

  @GetMapping("{id}")
  public User findById(@PathVariable("id")Integer id) {
    User user = userService.findById(id);
    return user;
  }
}

UserApplication为：

package com.bes;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import tk.mybatis.spring.annotation.MapperScan;

@SpringBootApplication
@MapperScan("com.bes.user.dao")
public class UserApplication {
  public static void main(String[] args) {
    SpringApplication.run(UserApplication.class, args);
  }
}

上述代码是填坑之后的，而错误的原因也非常奇葩在UserService中自动注入UserDao时提示我没有UserDao这个bean.

于是我就在UserDao上加了一个@Repository注解，如下图：

而后UserService不在报错了，运行UserApplication项目正常起来了。

但是通过浏览器访问时却一片空白。

这时在回到IDEA查看下方日志多了两行东西。1111是我调试时让它打印的无关东西。

这个奇怪的错误搞了我几个小时。最后发现不因给在UserDao上加@Reposity注解。UserService中注入Use人Dao报错时应如下处理：

1、鼠标点击报错的UserService中报错的UserDao

2、ALT+ENTER

3、选择第一个选项

4、在选择disable开头的选项

问题解决。

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