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Controller的使用

[TOC]

注解​

@Controller​

==必须配合模板使用==

1. Maven新加​

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>

2. 创建模板文件​

springboot2\src\main\resources\templates

新建一个 index.html 模板文件 内容随意

3. java这么写​

package cn.asdasd.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.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

@Controller
public class HelloController {

    @Autowired
    private GirlPropertie girlPropertie;

    @RequestMapping(value = "/hello",method = RequestMethod.GET)
    public String say() {
        return  "index";
    }

}

@RestController 写接口用​

@RestController 等于 @Controller + @ResponseBody 的组合

@RequestMapping("/hello") 设置整个页面的分组​

@RequestMapping(value = {"/say","/hi"},method = RequestMethod.GET)​

访问say 或 hi 都可以运行

method = RequestMethod.GET 请求方式，不加这个参数都可以访问

package cn.asdasd.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.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

@Controller
@ResponseBody
@RequestMapping("/hello")   
public class HelloController {

    @Autowired
    private GirlPropertie girlPropertie;

    @RequestMapping(value = {"/say","/hi"},method = RequestMethod.GET)
    public String say() {
        return  girlPropertie.getCupSize();
    }
}

获取URL中的值​

单一入口的参数​

package cn.asdasd.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.*;

@Controller
@ResponseBody
@RequestMapping("/hello")
public class HelloController {

    @Autowired
    private GirlPropertie girlPropertie;

    // http://localhost:8082/girl/hello/say/32
    @RequestMapping(value = "say/{id}",method = RequestMethod.GET)
    public String say(@PathVariable("id") Integer id) {
        return "id:" + id;
    }

    // http://localhost:8082/girl/hello/hi?id=3123
    @RequestMapping(value = "/hi",method = RequestMethod.GET)
    public String hi(@RequestParam("id") Integer myid) {
        return "id:" + myid;
    }


    // http://localhost:8082/girl/hello/hi3
    @RequestMapping(value = "/hi3",method = RequestMethod.GET)
    public String hi3(@RequestParam(value = "id",required = false,defaultValue = "0") Integer myid) {
        return "id:" + myid;
    }
}

这么访问 http://localhost:8082/girl/hello/say/32

? 的参数​

    @RequestMapping(value = "/hi",method = RequestMethod.GET)
    public String hi(@RequestParam("id") Integer myid) {
        return "id:" + myid;
    }

这样写就这么访问 http://localhost:8082/girl/hello/hi?id=3123

设置默认值​

    // http://localhost:8082/girl/hello/hi3
    @RequestMapping(value = "/hi3",method = RequestMethod.GET)
    public String hi3(@RequestParam(value = "id",required = false,defaultValue = "0") Integer myid) {
        return "id:" + myid;
    }

@GetMapping​

可以简化 @RequestMapping(value = "/hi3",method = RequestMethod.GET) 的写法

同类型的还有 @PostMapping @PutMapping @DeleteMapping 等

    // http://localhost:8082/girl/hello/hi4
    @GetMapping(value = "/hi4")
    public String hi4(@RequestParam(value = "id",required = false,defaultValue = "0") Integer myid) {
        return "hi4id:" + myid;
    }