HTTPClient 跨伺服器傳遞資料!

首先:

引入工具類: 可以自行添加/修改

public class Constants {
    public static final String TEST = "http://127.0.0.1:8080";
    public static final String PRODUCT_MANAGEMENT_HOST = "http://127.0.0.1:8090";

}
           

引入HttpClient支援:

@Autowired
private RestTemplate restTemplate;           

1.查詢資料 :getForEntity(url,Object.class)

參數一: 需要調用服務的位址(可以攜帶資料)
  參數二:String.class表示我希望傳回的body類型是String
  傳回值類型: ResponseEntity*<*T*>*  或 ResponseEntity*<*T*>*           

@GetMapping("/findProductByPage")
    public ResponseEntity<String> findProductByPage(Integer page, Integer rows,Product product){
        HttpStatus statusCode = null;
        try {
            String url = Constants.PRODUCT_MANAGEMENT_HOST+ "/product/findProductByPage?page="+page+"&rows="+rows+"&product="+product;
            ResponseEntity<String> entity = restTemplate.getForEntity(url, String.class);//跨伺服器通路
            statusCode = entity.getStatusCode();//擷取狀态碼
            String body = entity.getBody(); //擷取傳回資料
            return new ResponseEntity<>(body,statusCode);
        } catch (Exception e) {
            e.printStackTrace();
            return new ResponseEntity<>(statusCode);
        }
    }           

2.儲存資料: postForEntity(url,pojo,Object.class)

參數一:同上

參數二:傳遞的資料

參數三:同上

*注意:該方法傳遞給跨伺服器是 方法參數上需要加上@RequestBody 否則無法接受到資料

@PostMapping("/saveProduct")
   public ResponseEntity<String> saveProduct(Product product){
       HttpStatus statusCode =null;
       try {
           JSONObject proJson = JSONObject.fromObject(product);
           String prodct = proJson.toString();
           String url = Constants.PRODUCT_MANAGEMENT_HOST+"/product/saveProduct";
           ResponseEntity<String> entity = restTemplate.postForEntity(url, prodct, String.class);
           String body = entity.getBody();
           statusCode = entity.getStatusCode();
           return new ResponseEntity<>(HttpStatus.CREATED);
       } catch (Exception e) {
           e.printStackTrace();
           return new ResponseEntity<>(statusCode);
       }
   }           

//全部類:我使用的--->勿噴

@RestController
@RequestMapping("/product")
public class ProductController {

    @Autowired
    private RestTemplate restTemplate;

    @GetMapping("/findProductByPage")
    public ResponseEntity<String> findProductByPage(Integer page, Integer rows,Product product){
        HttpStatus statusCode = null;
        try {
            String url = Constants.PRODUCT_MANAGEMENT_HOST+ "/product/findProductByPage?page="+page+"&rows="+rows+"&product="+product;
            ResponseEntity<String> entity = restTemplate.getForEntity(url, String.class);
            statusCode = entity.getStatusCode();//擷取狀态碼
            String body = entity.getBody(); //擷取傳回資料
            return new ResponseEntity<>(body,statusCode);
        } catch (Exception e) {
            e.printStackTrace();
            return new ResponseEntity<>(statusCode);
        }
    }

    @PostMapping("/saveProduct")
    public ResponseEntity<String> saveProduct(Product product){
        HttpStatus statusCode =null;
        try {
            JSONObject proJson = JSONObject.fromObject(product);
            String prodct = proJson.toString();
            String url = Constants.PRODUCT_MANAGEMENT_HOST+"/product/saveProduct";
            ResponseEntity<String> entity = restTemplate.postForEntity(url, prodct, String.class);
            String body = entity.getBody();
            statusCode = entity.getStatusCode();
            return new ResponseEntity<>(HttpStatus.CREATED);
        } catch (Exception e) {
            e.printStackTrace();
            return new ResponseEntity<>(statusCode);
        }
    }
}