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

1、引入依赖：

commons-httpclient

commons-httpclient

3.1

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 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 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 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，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 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> requestParams = new HttpEntity<>(map, headers);

ResponseEntity 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

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