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Spring 的application.properties项目配置与注解

程序员文章站 2022-05-01 23:27:38
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application.properties 配置文件

默认启动项目的url配置，不需要加项目路径默认为/ 可以自行修改。

端口默认8080 修改端口号为8888

server.port=8888
server.context-path=/HelloWorld

helloWorld=spring boot

根据key-value直接注入helloWorld

@RestController
public class HelloWorldController {

	@Value("${helloWorld}")
	private String helloWorld;
	
	
	@RequestMapping("/helloWorld")
	public String say(){
		return helloWorld;
	}

}

application.properties配置数据库连接

有前缀的属性注入

请求url


mysql.jdbcName=com.mysql.jdbc.Driver
mysql.dbUrl=jdbc:mysql://localhost:3306/db_boot
mysql.userName=root
mysql.password=123456

@Component 让spring加载

@ConfigurationProperties(prefix="mysql") 就是application配置文件的前缀mysql

import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

/**
 * Mysql属性配置文件
 * @author Administrator
 *
 */
@Component
@ConfigurationProperties(prefix="mysql")
public class MysqlProperties {

	private String jdbcName;
	
	private String dbUrl;
	
	private String userName;
	
	private String password;

	public String getJdbcName() {
		return jdbcName;
	}

	public void setJdbcName(String jdbcName) {
		this.jdbcName = jdbcName;
	}

	public String getDbUrl() {
		return dbUrl;
	}

	public void setDbUrl(String dbUrl) {
		this.dbUrl = dbUrl;
	}

	public String getUserName() {
		return userName;
	}

	public void setUserName(String userName) {
		this.userName = userName;
	}

	public String getPassword() {
		return password;
	}

	public void setPassword(String password) {
		this.password = password;
	}
	
	
}

@Component已经变为spring管理的bean了@Resource  直接引入

import javax.annotation.Resource;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;


@RestController
public class HelloWorldController {

	
	@Resource
	private MysqlProperties mysqlProperties;

	@RequestMapping("/showJdbc")
	public String showJdbc(){
		return "mysql.jdbcName:"+mysqlProperties.getJdbcName()+"<br/>"
			  +"mysql.dbUrl:"+mysqlProperties.getDbUrl()+"<br/>"
			  +"mysql.userName:"+mysqlProperties.getUserName()+"<br/>"
			  +"mysql.password:"+mysqlProperties.getPassword()+"<br/>";
	}
}

spring

@Controller 处理http请求的注解，请求后台转发页面

@RequestMapping 映射路径

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

@Controller
@RequestMapping("/freemarker")
public class HelloWorldFreemarkerController {

	@RequestMapping("/say")
	public ModelAndView say(){
		ModelAndView mav=new ModelAndView();
		mav.addObject("message", "springboot！");
		mav.setViewName("helloWorld");
		return mav;
	}
}

helloWorld的模板文件

helloWorld.ftl

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
show: ${message}
</body>
</html>

@PathVariable获取url参数

@RequestParam 获取get或post参数或者是form和url参数

rest风格的资源url请求

index.html

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<script src="http://www.java1234.com/jquery-easyui-1.3.3/jquery.min.js"></script>
<script type="text/javascript">
	
</script>
</head>
<body>
<button onclick="show()">你好</button>
<a href="/HelloWorld/blog/21">天天</a>
<a href="/HelloWorld/blog/query?q=123456">搜索</a>
</body>
</html>
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.ModelAndView;

@Controller
@RequestMapping("/blog")
public class BlogController {

	@RequestMapping("/{id}")
	public ModelAndView show(@PathVariable("id") Integer id){
		ModelAndView mav=new ModelAndView();
		mav.addObject("id", id);
		mav.setViewName("blog");
		return mav;
	}
	
	@RequestMapping("/query")
	public ModelAndView query(@RequestParam(value="q",required=false)String q){
		ModelAndView mav=new ModelAndView();
		mav.addObject("q", q);
		mav.setViewName("query");
		return mav;
	}
}

blog.ftl

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
id:${id}
</body>
</html>

 

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