SpringBoot 第三篇 Controller
RestController注解等同于Controller注解加ResponseBody注解
根据上一篇文章我们修改HelloController的文件如下：
package com.lvzhihao.demo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;
//@RestController
@Controller
@ResponseBody
public class HelloController {
@Autowired
private KaBiSouProperties kaBiSouProperties;
// @Value("${myLong}")
// private String myLong;
// @Value("${content}")
// private String content;
@RequestMapping(value="/hello",method = RequestMethod.GET)
public String say( ) {
// return myLong;
// return content;
return kaBiSouProperties.getName();
}
}
这里就把RestController换成Controller和ResponseBody，运行项目并访问：
多个action访问,在RequestMapping里增加映射元素，修改后如下：
package com.lvzhihao.demo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;
//@RestController
@Controller
@ResponseBody
public class HelloController {
@Autowired
private KaBiSouProperties kaBiSouProperties;
// @Value("${myLong}")
// private String myLong;
// @Value("${content}")
// private String content;
@RequestMapping(value={"/hello","hi"},method = RequestMethod.GET)
public String say( ) {
// return myLong;
// return content;
return kaBiSouProperties.getName();
}
}
访问结果如下：
都可以成功访问
接着给整个设置映射，使其可以访问整个类，以及类里面的方法:
package com.lvzhihao.demo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;
//@RestController
@Controller
@ResponseBody
@RequestMapping("Test")
public class HelloController {
@Autowired
private KaBiSouProperties kaBiSouProperties;
// @Value("${myLong}")
// private String myLong;
// @Value("${content}")
// private String content;
@RequestMapping(value={"/hello","/hi"},method = RequestMethod.GET)
public String say( ) {
// return myLong;
// return content;
return kaBiSouProperties.getName();
}
}
重启系统访问：
修改请求方式：
我修改请求方式为：post， 用postman访问地址：
得到内容，说明是POST请求方式。
当不写请求方式的时候：
package com.lvzhihao.demo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;
//@RestController
@Controller
@ResponseBody
@RequestMapping("Test")
public class HelloController {
@Autowired
private KaBiSouProperties kaBiSouProperties;
// @Value("${myLong}")
// private String myLong;
// @Value("${content}")
// private String content;
@RequestMapping(value={"/hello","/hi"})
public String say( ) {
// return myLong;
// return content;
return kaBiSouProperties.getName();
}
}
访问得到如下：
但是不建议这样写，因为这样写不安全
@PathVariable 获取url的数据
@RequestParam 获取请求中的参数
@GetMapping 组合注解修改HelloController如下：
package com.lvzhihao.demo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;
//@RestController
@Controller
@ResponseBody
@RequestMapping("Test")
public class HelloController {
@Autowired
private KaBiSouProperties kaBiSouProperties;
// @Value("${myLong}")
// private String myLong;
// @Value("${content}")
// private String content;
@RequestMapping(value="/hello/{id}",method = RequestMethod.GET)
public String say(@PathVariable("id") Integer id ) {
// return myLong;
// return content;
// return kaBiSouProperties.getName();
return "id:"+id;
}
}
重启系统访问http://localhost:8081/Test/hello/23：
RequestParam传参,修改后如下:
package com.lvzhihao.demo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;
//@RestController
@Controller
@ResponseBody
@RequestMapping("Test")
public class HelloController {
@Autowired
private KaBiSouProperties kaBiSouProperties;
// @Value("${myLong}")
// private String myLong;
// @Value("${content}")
// private String content;
@RequestMapping(value="/hello", method = RequestMethod.GET)
public String hello(@RequestParam("id") Integer myId ) {
// return myLong;
// return content;
// return kaBiSouProperties.getName();
return "id:"+myId;
}
}
重启系统访问：
package com.lvzhihao.demo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;
//@RestController
@Controller
@ResponseBody
@RequestMapping("Test")
public class HelloController {
@Autowired
private KaBiSouProperties kaBiSouProperties;
// @Value("${myLong}")
// private String myLong;
// @Value("${content}")
// private String content;
@RequestMapping(value="/hello", method = RequestMethod.GET)
public String hello(@RequestParam(value="id",required = false,defaultValue = "0") Integer myId ) {
// return myLong;
// return content;
// return kaBiSouProperties.getName();
return "id:"+myId;
}
}
重启系统访问：
可以看到，不传参id的时候，默认值为0；
@GetMapping组合注解：
package com.lvzhihao.demo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;
//@RestController
@Controller
@ResponseBody
@RequestMapping("Test")
public class HelloController {
@Autowired
private KaBiSouProperties kaBiSouProperties;
// @Value("${myLong}")
// private String myLong;
// @Value("${content}")
// private String content;
// @RequestMapping(value="/hello", method = RequestMethod.GET)
@GetMapping(value ="/hello")
public String hello(@RequestParam(value="id",required = false,defaultValue = "0") Integer myId ) {
// return myLong;
// return content;
// return kaBiSouProperties.getName();
return "id:"+myId;
}
}
重启系统访问：
还有对应的几种组合注解：
参考来自慕课网