一文带你搞懂Java中Get和Post的使用
1 Get请求数据
1.1 Controller
1.2 Service
1.3 Application
1.4 Postman
2 Post接收数据
2.1 Controller
2.2 Service
2.3 Application
2.4 Postman
3 Post发送数据
3.1 Controller
3.2 Service
3.3 ResponseResult
3.4 Config
3.5 Application
3.6 Postman
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")
publicclass MyController {
@Autowired
MyService myService;
@GetMapping("/learnGet")
public String learnGet(){
return myService.learnGet();
}
}
1.2 Service
文件名MyService，内容为：
@Service
@EnableScheduling
publicclass 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。
项目地址：https://github.com/Snowstorm0/learn-get-post
2.1 Controller文件名MyController，内容为：
@RestController
@RequestMapping("/homepage")
publicclass 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
publicclass 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。
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")
publicclass 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
publicclass 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
publicclass ResponseResult {
privateint 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
publicclass 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。
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