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

SpringBoot 第三篇 Controller

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