HttpClient在HTTP协议接口测试中的使用

原作者 http://www.cnblogs.com/zhangfei/p/5099036.html
http://www.cnblogs.com/whatlonelytear/articles/4835538.html
HTTP协议的接口测试中，使用到最多的就是GET请求与POST请求，其中POST请求有FORM参数提交请求与RAW请求，下面我将结合HttpClient来实现一下这三种形式：

一.GET请求: GET请求时，参数一般是写在链接上的，代码如下：

public void get(String url){
CloseableHttpClient httpClient = null;
HttpGet httpGet = null;
try {
httpClient = HttpClients.createDefault();
RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(20000).setConnectTimeout(20000).build();
httpGet = new HttpGet(url);
httpGet.setConfig(requestConfig);
CloseableHttpResponse response = httpClient.execute(httpGet);
HttpEntity httpEntity = response.getEntity();
System.out.println(EntityUtils.toString(httpEntity,"utf-8"));
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}finally{
try {
if(httpGet!=null){
httpGet.releaseConnection();
}
if(httpClient!=null){
httpClient.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}

如果想把参数不写在链接上，单独的传进去，则可以这样：

public void get(String url, Map<String, String> params){
CloseableHttpClient httpClient = null;
HttpGet httpGet = null;
try {
httpClient = HttpClients.createDefault();
RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(20000).setConnectTimeout(20000).build();
String ps = "";
for (String pKey : params.keySet()) {
if(!"".equals(ps)){
ps = ps + "&";
}
ps = pKey+"="+params.get(pKey);
}
if(!"".equals(ps)){
url = url + "?" + ps;
}
httpGet = new HttpGet(url);
httpGet.setConfig(requestConfig);
CloseableHttpResponse response = httpClient.execute(httpGet);
HttpEntity httpEntity = response.getEntity();
System.out.println(EntityUtils.toString(httpEntity,"utf-8"));
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}finally{
try {
if(httpGet!=null){
httpGet.releaseConnection();
}
if(httpClient!=null){
httpClient.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}

 二. POST请求的表单提交方式,代码如下:

public void post(String url, Map<String, String> params){
CloseableHttpClient httpClient = null;
HttpPost httpPost = null;
try {
httpClient = HttpClients.createDefault();
RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(20000).setConnectTimeout(20000).build();
httpPost = new HttpPost(url);
httpPost.setConfig(requestConfig);
List<NameValuePair> ps = new ArrayList<NameValuePair>();
for (String pKey : params.keySet()) {
ps.add(new BasicNameValuePair(pKey, params.get(pKey)));
}
httpPost.setEntity(new UrlEncodedFormEntity(ps));
CloseableHttpResponse response = httpClient.execute(httpPost);
HttpEntity httpEntity = response.getEntity();
System.out.println(EntityUtils.toString(httpEntity,"utf-8"));
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}finally{
try {
if(httpPost!=null){
httpPost.releaseConnection();
}
if(httpClient!=null){
httpClient.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}

三. POST请求的RAW参数传递:

public void post(String url, String body){
CloseableHttpClient httpClient = null;
HttpPost httpPost = null;
try {
httpClient = HttpClients.createDefault();
RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(20000).setConnectTimeout(20000).build();
httpPost = new HttpPost(url);
httpPost.setConfig(requestConfig);
httpPost.setEntity(new StringEntity(body));
CloseableHttpResponse response = httpClient.execute(httpPost);
HttpEntity httpEntity = response.getEntity();
System.out.println(EntityUtils.toString(httpEntity,"utf-8"));
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}finally{
try {
if(httpPost!=null){
httpPost.releaseConnection();
}
if(httpClient!=null){
httpClient.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}

public class HttpUtil {
public static String post_http_request(String url, Map<String, String> params) {
URL u = null;
HttpURLConnection con = null;
// 构建请求参数
StringBuffer sb = new StringBuffer();
if (params != null) {
for (Entry<String, String> e : params.entrySet()) {
sb.append(e.getKey());
sb.append("=");
sb.append(e.getValue());
sb.append("&");
}
sb.substring(0, sb.length() - 1);
}
System.out.println("send_url:" + url);
System.out.println("send_data:" + sb.toString());
// 尝试发送请求
try {
u = new URL(url);
con = (HttpURLConnection) u.openConnection();
//// POST 只能为大写，严格限制，post会不识别
con.setRequestMethod("POST");
con.setDoOutput(true);
con.setDoInput(true);
con.setUseCaches(false);
con.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
OutputStreamWriter osw = new OutputStreamWriter(con.getOutputStream(), "UTF-8");
osw.write(sb.toString());
osw.flush();
osw.close();
} catch (Exception e) {
e.printStackTrace();
} finally {
if (con != null) {
con.disconnect();
}
}

// 读取返回内容
StringBuffer buffer = new StringBuffer();
try {
//一定要有返回值，否则无法把请求发送给server端。
BufferedReader br = new BufferedReader(new InputStreamReader(con.getInputStream(), "UTF-8"));
String temp;
while ((temp = br.readLine()) != null) {
buffer.append(temp);
//buffer.append("\n");
}
} catch (Exception e) {
e.printStackTrace();
}

return buffer.toString();
}
}

public static String  httpPostForm(String url,List<NameValuePair> nameValuePairList) throws IOException {
// 创建默认的httpClient实例.
DefaultHttpClient  client = new DefaultHttpClient();
HttpPost httppost = new HttpPost(url);
System.out.println("-------------url is----------------"+url);

UrlEncodedFormEntity uefEntity = null;
try {
uefEntity = new UrlEncodedFormEntity(nameValuePairList, "UTF-8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
httppost.setEntity(uefEntity);
// System.out.println("executing request " + httppost.getURI());
HttpResponse response = null;
try {
response = client.execute(httppost);
} catch (IOException e) {
e.printStackTrace();
}

String tmp;
HttpEntity entity = response.getEntity();
tmp=EntityUtils.toString(entity, "UTF-8");
client.getConnectionManager().shutdown();
return tmp;
}

List<NameValuePair> formParams = new ArrayList<NameValuePair>();
formParams.add(new BasicNameValuePair("key","value"));