HTTPClient 跨服务器传递数据!-白红宇

首先:

引入工具类: 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支持:

@Autowiredprivate RestTemplate restTemplate;

1.查询数据 :getForEntity(url,Object.class)

参数一: 需要调用服务的地址(可以携带数据)  参数二:String.class表示我希望返回的body类型是String  返回值类型: ResponseEntity*<*T*>*  或 ResponseEntity*<*T*>*

@GetMapping("/findProductByPage")    public ResponseEntity
    
      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
     
       entity = restTemplate.getForEntity(url, String.class);//跨服务器访问            statusCode = entity.getStatusCode();//获取状态码            String body = entity.getBody(); //获取返回数据            return new ResponseEntity<>(body,statusCode);        } catch (Exception e) {            e.printStackTrace();            return new ResponseEntity<>(statusCode);        }    }

2.保存数据: postForEntity(url,pojo,Object.class)

参数一:同上

参数二:传递的数据

参数三:同上

*注意:该方法传递给跨服务器是方法参数上需要加上@RequestBody 否则无法接受到数据

@PostMapping("/saveProduct")   public ResponseEntity
    
      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
     
       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);       }   }

//全部类:我使用的--->勿喷

@RestController@RequestMapping("/product")public class ProductController {    @Autowired    private RestTemplate restTemplate;    @GetMapping("/findProductByPage")    public ResponseEntity
    
      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
     
       entity = restTemplate.getForEntity(url, String.class);            statusCode = entity.getStatusCode();//获取状态码            String body = entity.getBody(); //获取返回数据            return new ResponseEntity<>(body,statusCode);        } catch (Exception e) {            e.printStackTrace();            return new ResponseEntity<>(statusCode);        }    }    @PostMapping("/saveProduct")    public ResponseEntity
      
        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
       
         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);        }    }}