1.不帶session的請求

服務端

@RequestMapping("/test1")
@ResponseBody
public String test1() {
	return "no land can see !";
}

客戶端

CloseableHttpClient httpclient = HttpClients.createDefault();
HttpGet getMethod = new HttpGet("http://localhost:8081/test1");
HttpResponse response;
try {
	response = httpclient.execute(getMethod);
	System.out.println(EntityUtils.toString(response.getEntity()));
} catch (ClientProtocolException e) {
	// TODO Auto-generated catch block
	e.printStackTrace();
} catch (IOException e) {
	// TODO Auto-generated catch block
	e.printStackTrace();
}
 

結果

no land can see !

2.帶session的http請求

服務端

@RequestMapping("/test2")
@ResponseBody
public String test2(HttpServletRequest request) {
	if (request.getSession().getAttribute("name") == null)
		return "no land no see !";
	else
		return "landed can see!";
}

客戶端

CloseableHttpClient httpclient = HttpClients.createDefault();
HttpGet getMethod = new HttpGet("http://localhost:8081/test2");
HttpResponse response;
try {
	response = httpclient.execute(getMethod);
	System.out.println(EntityUtils.toString(response.getEntity()));
} catch (ClientProtocolException e) {
	// TODO Auto-generated catch block
	e.printStackTrace();
} catch (IOException e) {
	// TODO Auto-generated catch block
	e.printStackTrace();
}
 

結果

no land no see !

3.模擬登入

服務端

@RequestMapping("/land")
@ResponseBody
public String land(HttpServletRequest request) {
	request.getSession().setAttribute("name", "knife");
	return "land !";
}

客戶端

        CloseableHttpClient httpclient=HttpClients.createDefault();
		HttpGet getMethod = new HttpGet("http://localhost:8081/land");
		HttpResponse response;
		try {
			response = httpclient.execute(getMethod);
			System.out.println(EntityUtils.toString(response.getEntity()));
			
			Header[] headers= response.getAllHeaders();
			String cookie=null;
			for(Header header:headers){
				if(header.getName().equals("Set-Cookie"))
					cookie=header.getValue();
			}
			
			if(cookie!=null){
				
				HttpGet getMethodWithCookie = new HttpGet("http://localhost:8081/test2");
				getMethodWithCookie.addHeader("Cookie",cookie);
				response=httpclient.execute(getMethodWithCookie);
				System.out.println(EntityUtils.toString(response.getEntity()));
			}
			
		} catch (ClientProtocolException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
 

結果

land !
landed can see!

4.httpclient的pom檔案

<!-- https://mvnrepository.com/artifact/org.apache.httpcomponents/httpclient -->
<dependency>
	<groupId>org.apache.httpcomponents</groupId>
	<artifactId>httpclient</artifactId>
	<version>4.5.3</version>
</dependency>