RestTemplate发送get、post请求

示例地址

1、发送get请求

/**
  * @return
  */
public String getToken(){
    RestTemplate client = new RestTemplate();
    StringBuilder sb = new StringBuilder("192.168.35.10");
    sb.append("/api/v4/oauth/token?");
    //添加应用编号参数
    sb.append("client_token punctuation">).append("#123qwer");
    String template = client.getForObject(sb.toString(), String.class);
    JSONObject jsonObject = JSONObject.parseObject(template);
    if ((Integer)jsonObject.get("code") == 200){
        String token = (String) jsonObject.getJSONObject("data").get("access_token");
        return token;
    }
    return "";
}

2、发送post请求，Payload提交和表单提交两种示例

• 使用Payload提交，即远程接口添加了@RequestBody注解接收参数

public void testUrl() {
    String url = "http://192.168.35.12:7060/users";
    //往请求体添加参数
    JSONObject postData = new JSONObject();
    postData.put("userId", "yangfanTest1");
    postData.put("userName", "yangfan");
    String s = sendPostRequest(url, postData);
    System.err.println(s);
}

public String sendPostRequest(String url, JSONObject params){
    RestTemplate client = new RestTemplate();
    HttpHeaders headers = new HttpHeaders();
    //这里设置为APPLICATION_JSON
    headers.setContentType(MediaType.APPLICATION_JSON);
    headers.add("loginUserId", "admin");
    headers.add("loginUserOrgId", "1");
    //将请求头部和参数合成一个请求
    HttpEntity<JSONObject> requestEntity = new HttpEntity<>(params, headers);
    //执行POST请求
    ResponseEntity<String> entity = client.postForEntity(url, requestEntity, String.class);
    return entity.getBody();
}

• 表单提交，远程接口使用表单方式接收参数，即不加@RequestBody

public void saveUserWithFormData() {

        //模拟远程接口
        String url = "http://127.0.0.1:8080/sakura/formdata/users";

        //往请求体添加参数
        MultiValueMap<String, Object> postData = new LinkedMultiValueMap<>();
        postData.add("userId", 123);
        postData.add("username", "test");
        String result = sendPostRequestWithFormData(url, postData);

        //处理返回的结果
        System.err.println(result );
}

public String sendPostRequestWithFormData(String url, MultiValueMap<String, Object> postData){
        RestTemplate client = new RestTemplate();
        HttpHeaders headers = new HttpHeaders();
        
        //这里设置为MULTIPART_FORM_DATA
        headers.setContentType(MediaType.MULTIPART_FORM_DATA);
        //请求头中添加参数
        headers.add("loginUserId", "admin");
        //将请求头部和参数合成一个请求
        HttpEntity<MultiValueMap<String, Object>> requestEntity = new HttpEntity<>(postData, headers);
        //执行POST请求
        ResponseEntity<String> entity = client.postForEntity(url, requestEntity, String.class);
        return entity.getBody();
    }