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=8088
welcome=spring boot u4F60u597D
mysql.jdbcName=com.mysql.jdbc.Driver
mysql.dbUrl=jdbc:mysql://localhost:3306/db_boot
mysql.userName=root
mysql.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()+"<br/>"
+"mysql.dbUrl:"+MySqlProperties.getDbUrl()+"<br/>"
+"mysql.userName:"+MySqlProperties.getUserName()+"<br/>"
+"mysql.password:"+MySqlProperties.getPassword();
}
}
2.4 结果