Java后台POST请求以application/x-www-form-urlencoded；charset=utf-8格式以及raw的JSON的请求方式

一、Java后台POST请求以application/x-www-form-urlencoded;

1、引入依赖：

<dependency><groupId>commons-httpclient</groupId><artifactId>commons-httpclient</artifactId><version>3.1</version>
</dependency>

2、写入代码：

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.NameValuePair;
import org.apache.commons.httpclient.methods.PostMethod;private String post(String postURL,String name,String age) throws Exception{PostMethod postMethod = new PostMethod(postURL) ;postMethod.setRequestHeader("Content-Type", "application/x-www-form-urlencoded;charset=utf-8") ;//参数设置，需要注意的就是里边不能传NULL，要传空字符串NameValuePair[] data = {new NameValuePair("name",name),new NameValuePair("age",age)};postMethod.setRequestBody(data);org.apache.commons.httpclient.HttpClient httpClient = new org.apache.commons.httpclient.HttpClient();httpClient.executeMethod(postMethod);String result = postMethod.getResponseBodyAsString() ;return result;
}

二、Java后台POST请求raw的JSON的请求方式

1、写入代码：

   //发送请求HttpHeaders headers = new HttpHeaders();headers.add("Content-Type","application/json");Map<String,Object> map = new HashMap<>();map.put("logitcsInterface",encryptStr);map.put("apiCode","030001");map.put("senderNo","1030005864872");map.put("timeStamp",DateUtil.dataToStr(new Date()));map.put("authorization","UZCCFaqJZTHV151C50");HttpEntity<String> formEntity = new HttpEntity<>(map.toString(), headers);RestTemplate restTemplate = new RestTemplate();String urlAdress = "https://api.ems.com.cn/amp-prod-api/f/amp/api/test";//请求地址ResponseEntity<String> responseEntity = restTemplate.postForEntity(urlAdress, formEntity, String.class);String jsonData = responseEntity.getBody();System.out.println(jsonData);

三、java实现postman中form-data传参方式

然后上次在用java实现一个向后台传参的形式时，在postman里以form-data的形式传参，我就尝试利用map进行数据的的封装Map<String,String>，结果发现后台无法正确解析参数。是因为map封装后并不是以&链接的。需要传递的参数和参数形式如下所示：

 利用spring来作为后端框架，form-data利用LinkedMultiValueMap对象来包装多个参数，参数以key-value形式，中间以&连接。利用java代码的实现如下：

public ResponseData baseApi(String methodArg,String bizContent){if(methodArg == null || methodArg.equals("")){ResponseData responseData = new ResponseData(false,"the param methodArg is null","");return responseData;}if(bizContent == null || bizContent.equals("")){ResponseData responseData = new ResponseData(false,"the param bizContent is null","");return responseData;}String apiUrl = Contants.publicUrl  +"/"+ methodArg;HttpHeaders headers = new HttpHeaders();MultiValueMap<String, String> map= new LinkedMultiValueMap<>();headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);map.add("app_id", Contants.clientId);map.add("method",methodArg);map.add("format","json");map.add("charset","utf-8");map.add("timestamp",Contants.timeStamp);map.add("token",Contants.accessToken);map.add("biz_content",bizContent);HttpEntity<MultiValueMap<String, String>> requestParams = new HttpEntity<>(map, headers);ResponseEntity<String> response = restTemplate.postForEntity(apiUrl,requestParams,String.class);String result =response.getBody();JSONObject jsStr = JSONObject.parseObject(result);String resultCode = jsStr.getString("code");if(Integer.parseInt(resultCode)!= 0){ResponseData responseData = new ResponseData(false,"error",result);return responseData;}ResponseData responseData = new ResponseData(true,"success",result);return responseData;}

详细了解postman的几种调用方式可参考：

java实现postman中form-data传参方式_postman formdata_程可爱的博客-CSDN博客