楼主最近爱上了一个新框架——Spring Boot, 搭建快还不用写一堆xml，最重要的是自带Tomcat 真是好
pom.xml
1 <?xml version="1.0" encoding="UTF-8"?> 2 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 3 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> 4 <modelVersion>4.0.0</modelVersion> 5 6 <groupId>com.demo</groupId> 7 <artifactId>Demo</artifactId> 8 <version>0.0.1-SNAPSHOT</version> 9 <packaging>jar</packaging> 10 11 <name>Demo</name> 12 <description>Demo project for Spring Boot</description> 13 14 <parent> 15 <groupId>org.springframework.boot</groupId> 16 <artifactId>spring-boot-starter-parent</artifactId> 17 <version>1.5.9.RELEASE</version> 18 <relativePath /> <!-- lookup parent from repository --> 19 </parent> 20 21 <properties> 22 <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> 23 <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> 24 <java.version>1.8</java.version> 25 </properties> 26 27 <dependencies> 28 29 <dependency> 30 <groupId>org.mybatis.spring.boot</groupId> 31 <artifactId>mybatis-spring-boot-starter</artifactId> 32 <version>1.3.1</version> 33 </dependency> 34 35 <dependency> 36 <groupId>org.springframework.boot</groupId> 37 <artifactId>spring-boot-starter-web</artifactId> 38 </dependency> 39 40 <dependency> 41 <groupId>org.springframework.boot</groupId> 42 <artifactId>spring-boot-starter-jdbc</artifactId> 43 <exclusions> 44 <exclusion> 45 <groupId>org.apache.tomcat</groupId> 46 <artifactId>tomcat-jdbc</artifactId> 47 </exclusion> 48 </exclusions> 49 </dependency> 50 51 <dependency> 52 <groupId>org.springframework.boot</groupId> 53 <artifactId>spring-boot-starter-test</artifactId> 54 <scope>test</scope> 55 </dependency> 56 57 </dependencies> 58 59 <build> 60 <plugins> 61 <plugin> 62 <groupId>org.springframework.boot</groupId> 63 <artifactId>spring-boot-maven-plugin</artifactId> 64 </plugin> 65 </plugins> 66 </build> 67 68 </project>
controller.java
1 package com.demo.controller;
2
3 import org.springframework.beans.factory.annotation.Autowired;
4 import org.springframework.stereotype.Controller;
5 import org.springframework.web.bind.annotation.RequestMapping;
6 import org.springframework.web.bind.annotation.ResponseBody;
7
8 import com.demo.domain.User;
9 import com.demo.service.UserService;
10
11 @Controller
12 @RequestMapping(value = "/uc")
13 public class UserController {
14
15 @Autowired
16 private UserService userService;
17
18 @ResponseBody
19 @RequestMapping("/stemp.htm")
20 private String sYeMian(User user){
21 System.out.println("进了方法 syso");
22
23 User u = new User();
24 u.setMuBan(user.getMuBan());
25
26 int i = userService.sYeMian(u);
27
28 if (i>0){
29 return "存储成功";
30 }
31 return "存储失败";
32 }
33 }
DemoApplication.java
1 package com.demo.example.demo;
2
3 import org.springframework.boot.SpringApplication;
4 import org.springframework.boot.autoconfigure.SpringBootApplication;
5
6 @SpringBootApplication
7 public class Demo1Application {
8
9 public static void main(String[] args) {
10 SpringApplication.run(Demo1Application.class, args);
11 }
12 }
然而运行之后就懵逼了
这是咋了，咋的就404了 我路径也挺对的啊 注解也都写上了啊 咋就找不到了呢？ debug吧它不进方法 看日志吧，他还不报错 这家伙给我急的 百度一下午也没解决，最后还是看官网才知道错在了那里，程序只加载Application.java所在包及其子包下的内容。
解决方案：
一、在Application类中加上@ComponentScan(basePackages = {“com.demo.controller”}) 多个之间用”,”分隔 当然，这样治标不治本
1 package com.demo.example.demo;
2
3 import org.springframework.boot.SpringApplication;
4 import org.springframework.boot.autoconfigure.SpringBootApplication;
5 import org.springframework.context.annotation.ComponentScan;
6
7 @SpringBootApplication
8 @ComponentScan(basePackages = {"com.demo.controller"})
9 public class Demo1Application {
10
11 public static void main(String[] args) {
12 SpringApplication.run(Demo1Application.class, args);
13 }
14 }
二、把包的目录结构修改成正确的
1 package com.demo;
2
3 import org.springframework.boot.SpringApplication;
4 import org.springframework.boot.autoconfigure.SpringBootApplication;
5 import org.springframework.context.annotation.ComponentScan;
6
7 @SpringBootApplication
8 public class Demo1Application {
9
10 public static void main(String[] args) {
11 SpringApplication.run(Demo1Application.class, args);
12 }
13 }