Java中Get和Post的使用

今天药忘吃喽~ 2023-09-28 20:09 7阅读 0赞

[原文链接][Link 1]

## 1 Get请求数据 ##

项目地址：https://github.com/Snowstorm0/learn-get-post

### 1.1 Controller ###

文件名MyController，内容为：

@RestController
    @RequestMapping("/homepage")
    public class MyController {
        
        @Autowired
        MyService myService;
    
        @GetMapping("/learnGet")
        public String learnGet(){
        
            return myService.learnGet();
        }
    }

### 1.2 Service ###

文件名MyService，内容为：

@Service
    @EnableScheduling
    public class MyService {
        
        public String learnGet(){
        
            Long timeLong = System.currentTimeMillis();
            SimpleDateFormat timeFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); //设置格式
            String timeString = timeFormat.format(timeLong);
            return timeString;
        }
    }

### 1.3 Application ###

在application.properties配置：

# 设置端口号
    server.port=8888

### 1.4 Postman ###

配置Get，地址为： http://localhost:8888/homepage/returnTime 。

即可获得当前时间戳。

![edd905c7ef8f5ba9dd062018b2f52014.png][]

## 2 Post接收数据 ##

项目地址：https://github.com/Snowstorm0/learn-get-post

### 2.1 Controller ###

文件名MyController，内容为：

@RestController
    @RequestMapping("/homepage")
    public class MyController {
        
        @Autowired
        MyService myService;
        @PostMapping("/postReceive")
        public Map<String, Object> postReceive(@RequestParam("number") int number, @RequestParam("name") String name) {
        
            return myService.postReceive(number, name);
        }
        @PostMapping("/postReceiveByMap")
        public Map<String, Object> postReceiveByMap(@RequestParam Map<String, Object> map) {
        
            System.out.println("map:" + map + "\n");
            return myService.postReceiveByMap(map);
        }
    }

### 2.2 Service ###

文件名MyService，内容为：

@Service
    @EnableScheduling
    public class MyService {
        
        public Map<String, Object> postReceive(int number, String name){
        
            Map<String, Object> res = new HashMap<>();
            res.put("number", number);
            res.put("name", name);
            return res;
        }
        public Map<String, Object> postReceiveByMap(Map<String, Object> map){
        
            int number = map.get("number") == null ? 0 : Integer.parseInt((String) map.get("number"));
            String name = map.get("name") == null ? "" : (String)map.get("name");
            Map<String, Object> res = new HashMap<>();
            res.put("number", number);
            res.put("name", name);
            System.out.println("map:" + map + "\n");
            System.out.println("res:" + res + "\n");
            return res;
        }

### 2.3 Application ###

在application.properties配置：

# 设置端口号
    server.port=8888

### 2.4 Postman ###

配置Get，地址为： http://localhost:8888/homepage/returnTime 。

即可获得输出。

![d3d1ebe2cb3fd06ef9d85002e5eb3cca.png][]

## 3 Post发送数据 ##

项目地址：https://github.com/Snowstorm0/learn-post-send

**需要注意，RestTemplate在postForObject时，用MultiValueMap，不可使用HashMap。**

### 3.1 Controller ###

文件名MyController，内容为：

@RestController
    @RequestMapping("/homepage")
    public class MyController {
        
    
        @Autowired
        MyService myService;
    
        @PostMapping("/postSend")
        public Map<String, Object> postSend() {
        
            return myService.postSend();
        }
    }

### 3.2 Service ###

文件名MyService，内容为：

@Service
    @EnableScheduling
    public class MyService {
        
        @Resource
        private RestTemplate restTemplate;
        String URL = "http://localhost:8888/homepage/postReceiveByMap";
    
        public Map<String, Object> postSend(){
        
            Map<String, Object> sendData = new HashMap<>();
            sendData.put("number", 3);
            sendData.put("name", "张三");
            ResponseEntity<ResponseResult> responseData = restTemplate.postForEntity(URL, sendData, ResponseResult.class);
            Map<String, Object> returnData = new HashMap<>();
            returnData.put("StatusCode:", responseData.getStatusCode());
            returnData.put("Body:", responseData.getBody());
            return returnData;
        }
    }

### 3.3 ResponseResult ###

public class ResponseResult {
        
    
        private int number;
        private String name;
    
        public ResponseResult(){
        
        }
    
        public int getNumber() {
        
            return number;
        }
        public void setNumber(int number) {
        
            this.number = number;
        }
        public String getName() {
        
            return name;
        }
        public void setName(String name) {
        
            this.name = name;
        }
    
        @Override
        public String toString() {
        
            return "ResponseResult [number=" + number + ",name=" + name + "]";
        }
    }

### 3.4 Config ###

@Configuration
    public class Config {
        
        @Bean
        public RestTemplate restTemplate(RestTemplateBuilder builder){
        
            return builder.build();
        }
    }

### 3.5 Application ###

在application.properties配置：

# 设置端口号
    server.port=8889

### 3.6 Postman ###

配置Post，地址为： http://localhost:8889/homepage/postSend

即可获得输出。

![a5783cbe13f12181fe27ee77da7f9513.png][]

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[代码的路][Link 2]

![在这里插入图片描述][9d4c3ab52e6445ec84bcbc77b92f0137.png]

[Link 1]: https://mp.weixin.qq.com/s/mC0D1nuCqIori5bWtLorWQ
[edd905c7ef8f5ba9dd062018b2f52014.png]: https://img-blog.csdnimg.cn/img_convert/edd905c7ef8f5ba9dd062018b2f52014.png
[d3d1ebe2cb3fd06ef9d85002e5eb3cca.png]: https://img-blog.csdnimg.cn/img_convert/d3d1ebe2cb3fd06ef9d85002e5eb3cca.png
[a5783cbe13f12181fe27ee77da7f9513.png]: https://img-blog.csdnimg.cn/img_convert/a5783cbe13f12181fe27ee77da7f9513.png
[Link 2]: https://mp.weixin.qq.com/s/t0t89DFgJ1TEzI4uI5giHg
[9d4c3ab52e6445ec84bcbc77b92f0137.png]: https://img-blog.csdnimg.cn/9d4c3ab52e6445ec84bcbc77b92f0137.png