RestTemplate訪問Restful接口

簡介：

       RestTemplate是Spring提供的用於訪問Rest服務的客戶端，RestTemplate提供了多種便捷訪問遠程Http服務的方法,能夠大大提高客戶端的編寫效率。一般情況下java代碼裏訪問restful服務，使用Apache的HttpClient。不過此種方法使用起來太過繁瑣。

定義一個簡單的Restful接口

@Controller
@RequestMapping("tpservice")
public class Tpservice {

	@ResponseBody
	@RequestMapping(value = "singleRecordSearch",method = RequestMethod.GET)
	public String JsonTest(@RequestParam String hphm,@RequestParam String hpzl) {
		ReturnValue r = new ReturnValue();
		TrafficPermit t = new TrafficPermit();
		t.setHphm("津A12345");
		t.setHpzl("01");
		t.setJxsd("週一、週五&07:00-09:00&早高峯,週二、週三&07:00-09:00&晚高峯");
		t.setTxqsrq(new Date());
		t.setTxjzrq(new Date());
		t.setTxxl("米東區/稻香南路,米東區/東華北路");
		t.setTxzbh("NO.123456789");
		t.setTxzmc("中型車通行證");
		r.setCode(1);
		r.setMessage("成功");
		r.setData(t);
		return JSON.toJSONString(r);
	}
}

使用RestTemplate訪問該服務

       1、封裝成工具類HttpTools

public class HttpTools{

	public static  ReturnValue sendPostRequest(String url, MultiValueMap<String, String> params){
        RestTemplate client = new RestTemplate();
        HttpHeaders headers = new HttpHeaders();
        HttpMethod method = HttpMethod.GET;
        headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);
        HttpEntity<MultiValueMap<String, String>> requestEntity = new HttpEntity<>(params, headers);
        ResponseEntity<ReturnValue> response = client.exchange(url, method, requestEntity, ReturnValue.class);
        return response.getBody();
    }
}

       2、訪問測試：

MultiValueMap<String, String> params = new LinkedMultiValueMap<>();
/*封裝參數，有幾個封裝幾個*/
params.add("hphm", pv.getHphm());
params.add("hpzl", pv.getHpzl());
ReturnValue rv = HttpTools.sendPostRequest("http://"+tpsIp+":"+tpsPort+"/"+tpsMethodPath+"", params);

public class ReturnValue {

	private int code;
	
	private String message;
	
	private TrafficPermitSyn data;

	public int getCode() {
		return code;
	}

	public void setCode(int code) {
		this.code = code;
	}

	public String getMessage() {
		return message;
	}

	public void setMessage(String message) {
		this.message = message;
	}

	public TrafficPermitSyn getData() {
		return data;
	}

	public void setData(TrafficPermitSyn data) {
		this.data = data;
	}
}