spring RestTemplate

public class HttpRequestUtil {
	private static final Logger logger = LoggerFactory.getLogger(HttpRequestUtil.class);
	
	public static String sendWithSpringRest(String url,String json,HttpMethod httpMethod) {
		RestTemplate restTemplate = new RestTemplate();
		HttpHeaders headers = new HttpHeaders();
		headers.setContentType(new MediaType("application","json",Charset.forName("UTF-8")));
		headers.setAccept(Arrays.asList(new MediaType[] {new MediaType("application","json",Charset.forName("UTF-8"))}));
		HttpEntity<String> requestEntity = new HttpEntity<String>(json,headers);
		ResponseEntity<String> exchange = restTemplate.exchange(url, httpMethod,requestEntity,String.class);
		String body = exchange.getBody();
		logger.info("-------------->"+body);
		return body;
	}
}

@Autowired  
    private RestTemplate restTemplate;  

    @GetMapping("/forObject")
    public Map<String, Object> testForObject(Map<String, Object> params){
    	Map<String, Object> retMap = new HashMap<String, Object>();
    	Map<String, Object> paramsRest = new HashMap<String, Object>();
    	paramsRest.put("userName", "用戶名");
    	paramsRest.put("userPwd", "123456");
    	String urlTemplate = "http://localhost:8888/rest"+"?userName={userName}&userPwd={userPwd}";
    	Map forObject = this.restTemplate.getForObject(urlTemplate,Map.class,paramsRest);
    	System.out.println("--------result------------->"+forObject);
    	return retMap;
    }
    
    @RequestMapping("/exchange")
    public Map<String, Object> testExchange(){
    	String url = "http://localhost:8888/rest";
    	HttpHeaders headers = new HttpHeaders();
    	//  請勿輕易改變此提交方式，大部分的情況下，提交方式都是表單提交
    	headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);
    	//  封裝參數，千萬不要替換爲Map與HashMap，否則參數無法傳遞
    	MultiValueMap<String, String> params= new LinkedMultiValueMap<String, String>();
    	//  也支持中文
    	params.add("userName", "用戶名");
    	params.add("userPwd", "123456");
    	HttpEntity<MultiValueMap<String, String>> requestEntity = new HttpEntity<MultiValueMap<String, String>>(params, headers);
    	//  執行HTTP請求
    	ResponseEntity<String> response = restTemplate.exchange(url, HttpMethod.POST, requestEntity, String.class);
    	//  輸出結果
    	System.out.println("-----------responseBody------------>"+response.getBody());
    	return null;
    }