HttpClient发送http请求以及上传文件

1.封装请求体

private UrlEncodedFormEntity getUrlEntry(Map<String, Object> param) throws UnsupportedEncodingException {
List<NameValuePair> params = new ArrayList<NameValuePair>();
Iterator<String> iterator = param.keySet().iterator();
while (iterator.hasNext()) {
String key = iterator.next();
params.add(new BasicNameValuePair(key, (String) param.get(key)));
}
UrlEncodedFormEntity uefEntity = new UrlEncodedFormEntity(params, "UTF-8");
return uefEntity;
}

private MultipartEntity getMutipartEntry(Map<String, Object> param, File file) throws UnsupportedEncodingException {
if (file == null) {
throw new IllegalArgumentException("文件不能为空");
}
FileBody fileBody = new FileBody(file);
FormBodyPart filePart = new FormBodyPart("file", fileBody);
MultipartEntity multipartEntity = new MultipartEntity();
multipartEntity.addPart(filePart);

Iterator<String> iterator = param.keySet().iterator();
while (iterator.hasNext()) {
String key = iterator.next();
FormBodyPart field = new FormBodyPart(key, new StringBody((String) param.get(key)));
multipartEntity.addPart(field);

}
return multipartEntity;
}

2.发送请求

public String postUrl(String url,Map<String, Object> param) throws ClientProtocolException, IOException {
String res = null;
CloseableHttpClient httpClient = HttpClients.createDefault();
HttpPost httppost = new HttpPost(url);
UrlEncodedFormEntity uefEntity = getUrlEntry(param);
httppost.setEntity(uefEntity);
CloseableHttpResponse response = httpClient.execute(httppost);
HttpEntity entity = response.getEntity();
if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
res = EntityUtils.toString(entity, "UTF-8");
response.close();
} else {
res = EntityUtils.toString(entity, "UTF-8");
response.close();
throw new IllegalArgumentException(res);
}

return res;
}

public String postFile(String url,Map<String, Object> param, File file) throws ClientProtocolException, IOException {
String res = null;
CloseableHttpClient httpClient = HttpClients.createDefault();
HttpPost httppost = new HttpPost(url);
httppost.setEntity(getMutipartEntry(param,file));
CloseableHttpResponse response = httpClient.execute(httppost);
HttpEntity entity = response.getEntity();
if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
res = EntityUtils.toString(entity, "UTF-8");
response.close();
} else {
res = EntityUtils.toString(entity, "UTF-8");
response.close();
throw new IllegalArgumentException(res);
}
return res;
}