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添加相关依赖
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.62</version>
</dependency>
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.13</version>
</dependency>
GET： 当你有参数时直接进行拼接即可，无参就不需要拼接。
HttpClient发送示例
/**
* GET---无参测试
*
* @date 2018年7月13日 下午4:18:50
*/
@Test
public void doGetTestOne() {
// 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Get请求
HttpGet httpGet = new HttpGet("http://baidu.com);
// 响应模型
CloseableHttpResponse response = null;
try {
// 由客户端执行(发送)Get请求
response = httpClient.execute(httpGet);
// 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();
}
}
}
Get 有参：
可以在网址后面直接拼接，也可以使用
httpPost.setEntity(new StringEntity(String.valueOf(params), StandardCharsets.UTF_8)); //进行后面拼接内容
// 获得Http客户端
CloseableHttpClient httpClient = HttpClientBuilder.create().build();
// 参数
StringBuffer params = new StringBuffer();
params.append("足球");//将想要得到的内容拼接到网站后面
// 创建Post请求
HttpGet httpGet = new HttpGet("https://www.baidu.com/");
// 设置ContentType
httpGet.addHeader("content-type", "application/json;charset=utf-8");
httpGett.addHeader("accept", "application/json");
httpGet.addHeader(new StringEntity(String.valueOf(params), StandardCharsets.UTF_8)); //进行后面拼接内容 // 响应模型
CloseableHttpResponse response = null;
try {
// 由客户端执行(发送)Get请求
response = httpClient.execute(httpGet);
// 从响应模型中获取响应实体
HttpEntity responseEntity = response.getEntity();
System.out.println("成功");
// String responseString = EntityUtils.toString(responseEntity);
// JSONObject responseJson = (JSONObject) JSON.parse(responseString);
// String id = (String) responseJson.get("id");//根据key值 id 获取其内容
//-----------------------------------------------------------------------------------
URI uri = httpGet.getURI();//获得网址
System.out.println(uri);//www.baidu.com
HttpEntity entity = httpPost.getEntity();//获得网址实体
InputStream content = entity.getContent();//获得网址添加内容
StringBuffer sb;
BufferedReader br = null;
br = new BufferedReader(new InputStreamReader(content));//进行流的转换
sb = new StringBuffer();
String data;
while ((data = br.readLine()) != null) {
sb.append(data);
}
System.out.println(sb);//足球
//
} 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();
}
}
}
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();
}
}
}
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();
}
}
}
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