接:HttpClient详细使用示例 - get(一)
目录
POST无参:
HttpClient发送示例:
/**
* POST---无参测试
*
* @date 2018年7月13日 下午4:18:50
*/
@Test
public void doPostTestOne() {
// 获得Http客户端(可以理解为:你得先有一个浏览器;注意:实际上HttpClient与浏览器是不一样的)
CloseableHttpClient httpClient = HttpClientBuilder.create().build();
// 创建Post请求
HttpPost httpPost = new HttpPost("http://localhost:12345/doPostControllerOne");
// 响应模型
CloseableHttpResponse response = null;
try {
// 由客户端执行(发送)Post请求
response = httpClient.execute(httpPost);
// 从响应模型中获取响应实体
HttpEntity responseEntity = response.getEntity();
System.out.println("响应状态为:" + response.getStatusLine());
if (responseEntity != null) {
System.out.println("响应内容长度为:" + responseEntity.getContentLength());
System.out.println("响应内容为:" + EntityUtils.toString(responseEntity));
}
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (ParseException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
// 释放资源
if (httpClient != null) {
httpClient.close();
}
if (response != null) {
response.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
对应接收示例:
POST有参(普通参数):
注:POST传递普通参数时,方式与GET一样即可,这里以直接在url后缀上参数的方式示例。
HttpClient发送示例:
/**
* POST---有参测试(普通参数)
*
* @date 2018年7月13日 下午4:18:50
*/
@Test
public void doPostTestFour() {
// 获得Http客户端(可以理解为:你得先有一个浏览器;注意:实际上HttpClient与浏览器是不一样的)
CloseableHttpClient httpClient = HttpClientBuilder.create().build();
// 参数
StringBuffer params = new StringBuffer();
try {
// 字符数据最好encoding以下;这样一来,某些特殊字符才能传过去(如:某人的名字就是“&”,不encoding的话,传不过去)
params.append("name=" + URLEncoder.encode("&", "utf-8"));
params.append("&");
params.append("age=24");
} catch (UnsupportedEncodingException e1) {
e1.printStackTrace();
}
// 创建Post请求
HttpPost httpPost = new HttpPost("http://localhost:12345/doPostControllerFour" + "?" + params);
// 设置ContentType(注:如果只是传普通参数的话,ContentType不一定非要用application/json)
httpPost.setHeader("Content-Type", "application/json;charset=utf8");
// 响应模型
CloseableHttpResponse response = null;
try {
// 由客户端执行(发送)Post请求
response = httpClient.execute(httpPost);
// 从响应模型中获取响应实体
HttpEntity responseEntity = response.getEntity();
System.out.println("响应状态为:" + response.getStatusLine());
if (responseEntity != null) {
System.out.println("响应内容长度为:" + responseEntity.getContentLength());
System.out.println("响应内容为:" + EntityUtils.toString(responseEntity));
}
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (ParseException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
// 释放资源
if (httpClient != null) {
httpClient.close();
}
if (response != null) {
response.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
对应接收示例:
POST有参(对象参数):
先给出User类
HttpClient发送示例:
/**
* POST---有参测试(对象参数)
*
* @date 2018年7月13日 下午4:18:50
*/
@Test
public void doPostTestTwo() {
// 获得Http客户端(可以理解为:你得先有一个浏览器;注意:实际上HttpClient与浏览器是不一样的)
CloseableHttpClient httpClient = HttpClientBuilder.create().build();
// 创建Post请求
HttpPost httpPost = new HttpPost("http://localhost:12345/doPostControllerTwo");
User user = new User();
user.setName("潘晓婷");
user.setAge(18);
user.setGender("女");
user.setMotto("姿势要优雅~");
// 我这里利用阿里的fastjson,将Object转换为json字符串;
// (需要导入com.alibaba.fastjson.JSON包)
String jsonString = JSON.toJSONString(user);
StringEntity entity = new StringEntity(jsonString, "UTF-8");
// post请求是将参数放在请求体里面传过去的;这里将entity放入post请求体中
httpPost.setEntity(entity);
httpPost.setHeader("Content-Type", "application/json;charset=utf8");
// 响应模型
CloseableHttpResponse response = null;
try {
// 由客户端执行(发送)Post请求
response = httpClient.execute(httpPost);
// 从响应模型中获取响应实体
HttpEntity responseEntity = response.getEntity();
System.out.println("响应状态为:" + response.getStatusLine());
if (responseEntity != null) {
System.out.println("响应内容长度为:" + responseEntity.getContentLength());
System.out.println("响应内容为:" + EntityUtils.toString(responseEntity));
}
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (ParseException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
// 释放资源
if (httpClient != null) {
httpClient.close();
}
if (response != null) {
response.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
对应接收示例:
POST有参(普通参数 + 对象参数):
注:POST传递普通参数时,方式与GET一样即可,这里以通过URI获得HttpPost的方式为例。
先给出User类:
HttpClient发送示例:
/**
* POST---有参测试(普通参数 + 对象参数)
*
* @date 2018年7月13日 下午4:18:50
*/
@Test
public void doPostTestThree() {
// 获得Http客户端(可以理解为:你得先有一个浏览器;注意:实际上HttpClient与浏览器是不一样的)
CloseableHttpClient httpClient = HttpClientBuilder.create().build();
// 创建Post请求
// 参数
URI uri = null;
try {
// 将参数放入键值对类NameValuePair中,再放入集合中
List<NameValuePair> params = new ArrayList<>();
params.add(new BasicNameValuePair("flag", "4"));
params.add(new BasicNameValuePair("meaning", "这是什么鬼?"));
// 设置uri信息,并将参数集合放入uri;
// 注:这里也支持一个键值对一个键值对地往里面放setParameter(String key, String value)
uri = new URIBuilder().setScheme("http").setHost("localhost").setPort(12345)
.setPath("/doPostControllerThree").setParameters(params).build();
} catch (URISyntaxException e1) {
e1.printStackTrace();
}
HttpPost httpPost = new HttpPost(uri);
// HttpPost httpPost = new
// HttpPost("http://localhost:12345/doPostControllerThree1");
// 创建user参数
User user = new User();
user.setName("潘晓婷");
user.setAge(18);
user.setGender("女");
user.setMotto("姿势要优雅~");
// 将user对象转换为json字符串,并放入entity中
StringEntity entity = new StringEntity(JSON.toJSONString(user), "UTF-8");
// post请求是将参数放在请求体里面传过去的;这里将entity放入post请求体中
httpPost.setEntity(entity);
httpPost.setHeader("Content-Type", "application/json;charset=utf8");
// 响应模型
CloseableHttpResponse response = null;
try {
// 由客户端执行(发送)Post请求
response = httpClient.execute(httpPost);
// 从响应模型中获取响应实体
HttpEntity responseEntity = response.getEntity();
System.out.println("响应状态为:" + response.getStatusLine());
if (responseEntity != null) {
System.out.println("响应内容长度为:" + responseEntity.getContentLength());
System.out.println("响应内容为:" + EntityUtils.toString(responseEntity));
}
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (ParseException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
// 释放资源
if (httpClient != null) {
httpClient.close();
}
if (response != null) {
response.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
对应接收示例: