springboot实现postman中form-data传参实现过程

public StringBuffer caller(Map<String,String> map, String strURL) {
        // start
        HttpClient httpClient = new HttpClient();
 
        HttpConnectionManagerParams managerParams = httpClient
                .getHttpConnectionManager().getParams();
        // 设置连接超时时间(单位毫秒)
        managerParams.setConnectionTimeout(30000);
        // 设置读数据超时时间(单位毫秒)
        managerParams.setSoTimeout(120000);
 
        PostMethod postMethod = new PostMethod(strURL);
        // 将请求参数的值放入postMethod中
        String strResponse = null;
        StringBuffer buffer = new StringBuffer();
        // end
        try {
            //设置参数到请求对象中
            for(String key : map.keySet()){
                postMethod.addParameter(key, map.get(key));
            }
            
            int statusCode = httpClient.executeMethod(postMethod);
            if (statusCode != HttpStatus.SC_OK) {
                throw new IllegalStateException("Method failed: "
                        + postMethod.getStatusLine());
            }
            BufferedReader reader = null;
            reader = new BufferedReader(new InputStreamReader(
                    postMethod.getResponseBodyAsStream(), "UTF-8"));
            while ((strResponse = reader.readLine()) != null) {
                buffer.append(strResponse);
            }
        } catch (Exception ex) {
            throw new IllegalStateException(ex.toString());
        } finally {
            // 释放连接
            postMethod.releaseConnection();
        }
        return buffer;
    }

postMethod.setRequestHeader("Content-Type", "multipart/form-data");

public String caller(Map<String,String> map, String strURL){
		HttpHeaders headers = new HttpHeaders();
		MultiValueMap<String, Object> map= new LinkedMultiValueMap<>();
		headers.add("Content-Type", "multipart/form-data");
	    //设置参数到请求对象中
        for(String key : map.keySet()){
        	map.add(key, map.get(key));
        }
		
		HttpEntity<MultiValueMap<String, Object>> requestParams = new HttpEntity<>(map, headers);
		ResponseEntity<String> response = restTemplate.postForEntity(apiUrl,requestParams,String.class);
		String result =response.getBody();
		return result;
}