spring-boot 实例

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1、jdk1.6 Java6

2、创建maven web项目，项目结构图：

3、pom.xml

<groupId>spring-boot</groupId>

<artifactId>spring-boot</artifactId>

<version>0.0.1-SNAPSHOT</version>

<name>spring-boot</name>

<url>http://maven.apache.org</url>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-parent</artifactId>

<version>1.2.5.RELEASE</version>

</parent>

<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

<java.version>1.6</java.version>

<tomcat.version>7.0.59</tomcat.version>

</properties>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-web</artifactId>

<version>1.2.5.RELEASE</version>

</dependency>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-thymeleaf</artifactId>

<version>1.2.5.RELEASE</version>

</dependency>

<groupId>junit</groupId>

<artifactId>junit</artifactId>

</dependency>

<groupId>javax.servlet</groupId>

</dependency>

</dependencies>

<build>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-maven-plugin</artifactId>

<version>1.2.5.RELEASE</version>

</plugin>

</plugins>

</build>

</project>

4、ApplicationMain .java

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.EnableAutoConfiguration;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RestController;

@EnableAutoConfiguration

@SpringBootApplication

@RestController

public class ApplicationMain {

@RequestMapping("/hello1")

public String demo() {

return "Hello World!";

}

public static void main(String[] args){

//SpringApplication.run(ApplicationMain.class, args);

SpringApplication.run(new Object[]{(Object)HelloWorld.class,(Object)ApplicationMain.class}, args);

}

5、HelloWorld.java

import org.springframework.boot.autoconfigure.EnableAutoConfiguration;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.stereotype.Controller;

import org.springframework.ui.Model;

import org.springframework.web.bind.annotation.PathVariable;

import org.springframework.web.bind.annotation.RequestMapping;

@Controller

@EnableAutoConfiguration

@SpringBootApplication

public class HelloWorld{

@RequestMapping("/login")

public String test(String name,Model model) {

model.addAttribute("name",name);

return "hello";

}

@RequestMapping("/test/{name}")

public String test2(@PathVariable String name,String modelstr,Model model) {

System.out.println(name);

model.addAttribute("name",name);

model.addAttribute("model",modelstr);

return "test";

}

6、hello.html

<!DOCTYPE html>

<head>

<title>Insert title here</title>

</head>

<body>

<h3>我是页面渲染的结果：</h3>

<hr/>

</body>

</html>

优化：

由于原有的第四步骤，main里面需要些所有要执行的类，SpringApplication.run(new Object[]{(Object)HelloWorld.class,(Object)ApplicationMain.class}, args);因此，我就想怎么才可以写一个main以后，再也不在考虑main的问题了，后来费劲心思终于找到，很简单只要写main方法的类继承extends SpringBootServletInitializer 然后main方法写SpringApplication.run(ApplicationMain.class, args);以后不管写多少执行类都不在去考虑main里面还没有配置的问题了

</project>

2、遇到问题

①The type java.lang.reflect.AnnotatedElement cannot be resolved. It is indirectly referenced from required .class files

该问题是有这一行SpringApplication.run(new Object[]{HelloWorld.class,ApplicationMain.class}, args)引起，是由于HelloWorld.class并不是一个Object对象，需要强转SpringApplication.run(new Object[]{(Object)HelloWorld.class,(Object)ApplicationMain.class}, args);如果类型没问题还报以上错误，就只能看看jdk版本问题了

②java.lang.UnsupportedClassVersionError: javax/annotation/ManagedBean : Unsupported major.minor version 51.0

这是由于jdk版本引起的问题，我用的1.6，所以运行spring-boot的main方法就报错，解决办法，spring-boot最好用1.8版本的jdk，这样的话就没有问题；当然有些公司直接要求只能应用jdk1.6版本，那我们就应该知道，是什么引起的，这样我们才好解决哦，我的是由于spring-boot默认内嵌的tomcat是8.*的版本，jdk1.6不支持，所以我们可以pom文件设定tomcat的版本<properties><tomcat.version>7.0.59</tomcat.version></properties>，完美解决！

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