一、@RestController和@Controller的区别

@RestController注解相当于@ResponseBody ＋ @Controller合在一起的作用。

如果只是使用@RestController注解Controller，则Controller中的方法无法返回jsp页面，配置的视图解析器InternalResourceViewResolver不起作用，返回的内容就是Return 里的内容。例如：本来应该到success.jsp页面的，则其显示success.

如果需要返回到指定页面，则需要用 @Controller配合视图解析器InternalResourceViewResolver才行。

如果需要返回JSON，XML或自定义mediaType内容到页面，则需要在对应的方法上加上@ResponseBody注解。

二、ConfigurationProperties配置方式

　　2.1　　配置一个MySqlProperties

package com.shyroke.config;import org.springframework.boot.context.properties.ConfigurationProperties;import org.springframework.stereotype.Component;@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;    }}

　　2.2　　配置application.properties　　

server.port=8088welcome=spring boot \u4F60\u597Dmysql.jdbcName=com.mysql.jdbc.Drivermysql.dbUrl=jdbc:mysql://localhost:3306/db_bootmysql.userName=rootmysql.password=

　　2.3　　编写控制器

package com.shyroke.controller;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.beans.factory.annotation.Value;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;import com.shyroke.config.MySqlProperties;@RestController@RequestMapping(value="/hello")public class HelloWorldController {        @Value("${welcome}")    private String welcome;        @Autowired    private MySqlProperties MySqlProperties;        @RequestMapping(value="/login")    public String login() {        return "mysql.jdbcName:"+MySqlProperties.getJdbcName()+"
"                  +"mysql.dbUrl:"+MySqlProperties.getDbUrl()+"
"                  +"mysql.userName:"+MySqlProperties.getUserName()+"
"                  +"mysql.password:"+MySqlProperties.getPassword();    }}