HttpClient的用法

客户端模拟http请求工具

Postmen(谷歌插件)、RestClient

服务器模拟http请求工具

httpclient、HttpURLConnection

httpCient请求代码

/**

 * 发送 post请求访问本地应用并根据传递参数不同返回不同结果

 */

public void post() {

// 创建默认的httpClient实例.

CloseableHttpClient httpclient = HttpClients.createDefault();

// 创建httppost

HttpPost httppost = new HttpPost("http://localhost:8080/myDemo/Ajax/serivceJ.action");

// 创建参数队列

List<NameValuePair> formparams = new ArrayList<NameValuePair>();

formparams.add(new BasicNameValuePair("type", "house"));

UrlEncodedFormEntity uefEntity;

try {

uefEntity = new UrlEncodedFormEntity(formparams, "UTF-8");

httppost.setEntity(uefEntity);

System.out.println("executing request " + httppost.getURI());

CloseableHttpResponse response = httpclient.execute(httppost);

try {

HttpEntity entity = response.getEntity();

if (entity != null) {

System.out.println("--------------------------------------");

System.out.println("Response content: " + EntityUtils.toString(entity, "UTF-8"));

System.out.println("--------------------------------------");

}

} finally {

response.close();

}

} catch (ClientProtocolException e) {

e.printStackTrace();

} catch (UnsupportedEncodingException e1) {

e1.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

} finally {

// 关闭连接,释放资源

try {

httpclient.close();

} catch (IOException e) {

e.printStackTrace();

}

}

}

 

/**

 * 发送 get请求

 */

public void get() {

CloseableHttpClient httpclient = HttpClients.createDefault();

try {

// 创建httpget.

HttpGet httpget = new HttpGet("http://www.baidu.com/");

System.out.println("executing request " + httpget.getURI());

// 执行get请求.

CloseableHttpResponse response = httpclient.execute(httpget);

try {

// 获取响应实体

HttpEntity entity = response.getEntity();

System.out.println("--------------------------------------");

// 打印响应状态

System.out.println(response.getStatusLine());

if (entity != null) {

// 打印响应内容长度

System.out.println("Response content length: " + entity.getContentLength());

// 打印响应内容

System.out.println("Response content: " + EntityUtils.toString(entity));

}

System.out.println("------------------------------------");

} finally {

response.close();

}

} catch (ClientProtocolException e) {

e.printStackTrace();

} catch (ParseException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

} finally {

// 关闭连接,释放资源

try {

httpclient.close();

} catch (IOException e) {

e.printStackTrace();

}

}

}

前端ajax请求

$.ajax({

type : 'post',

dataType : "text",

url : "http://a.a.com/a/FromUserServlet",

data : "userName=小明&userAge=24",

success : function(msg) {

alert(msg);

}

});