Get Java send requests via http protocol and Post

Get Java send requests via http protocol and Post

This article is based on the Windows 10 system environment, the use of MyEclipse to build a java project, and send Get and Post requests via http protocol

• Windows 10
• MyEclipse

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First, the preparatory work

(1) download tools need to use the jar package

commons-beanutils-1.9.3.jar
commons-collections-3.2.1.jar
commons-lang-2.6.jar
commons-logging-1.2.jar
ezmorph-1.0.6.jar
httpclient-4.5.2.jar
httpcore-4.4.10.jar
json-lib-2.4-jdk15.jar

Two, Post request method

(1) encapsulation of the json data format, and then sent

/**
 * 
 */
package com.inspur;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URI;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.NameValuePair;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.utils.URLEncodedUtils;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;

import net.sf.json.JSONObject;

/**
 * ClassName: contect_flask
 * Function: TODO ADD FUNCTION
 * @author: xuzheng
 * date: 2019-7-1 下午2:03:00
 */
public class contect_flask {
 
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		JSONObject jsonObject1 = new JSONObject();
		JSONObject jsonObject2 = new JSONObject();
		jsonObject2.put("deviceID", "110");
		jsonObject2.put("state", "0");
		jsonObject2.put("channel", "channel");
		jsonObject1.put("item", jsonObject2);
		jsonObject1.put("requestCommand", "control");
		String result = contect_flask.post(jsonObject1, "http://172.30.12.188:5003/test/hello");

		System.out.println(result);
		
	}
	
	public static String post(JSONObject json, String url){
		String result = "";
		HttpPost post = new HttpPost(url);
		try{
			CloseableHttpClient httpClient = HttpClients.createDefault();
        
			post.setHeader("Content-Type","application/json;charset=utf-8");
			post.addHeader("Authorization", "Basic YWRtaW46");
			StringEntity postingString = new StringEntity(json.toString(),"utf-8");
			post.setEntity(postingString);
			HttpResponse response = httpClient.execute(post);
			
			InputStream in = response.getEntity().getContent();
			BufferedReader br = new BufferedReader(new InputStreamReader(in, "utf-8"));
			StringBuilder strber= new StringBuilder();
			String line = null;
			while((line = br.readLine())!=null){
				strber.append(line+'\n');
			}
			br.close();
			in.close();
			result = strber.toString();
			if(response.getStatusLine().getStatusCode()!=HttpStatus.SC_OK){
				result = "服务器异常";
			}
		} catch (Exception e){
			System.out.println("请求异常");
			throw new RuntimeException(e);
		} finally{
			post.abort();
		}
		return result;
	}
}

Three, Get request method

(1) Get request parameter no way

/**
 * 
 */
package com.inspur;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URI;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.NameValuePair;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.utils.URLEncodedUtils;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;

import net.sf.json.JSONObject;

/**
 * ClassName: contect_flask
 * Function: TODO ADD FUNCTION
 * @author: xuzheng
 * date: 2019-7-1 下午2:03:00
 */
public class contect_flask {
 
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		String result = contect_flask.get("http://172.30.12.188:5003/test/hello");
		
		System.out.println(result);
	}
	
	public static String get(String url){
		String result = "";
		HttpGet get = new HttpGet(url);
		try{
			CloseableHttpClient httpClient = HttpClients.createDefault();
			
			HttpResponse response = httpClient.execute(get);
			result = getHttpEntityContent(response);
			
			if(response.getStatusLine().getStatusCode()!=HttpStatus.SC_OK){
				result = "服务器异常";
			}
		} catch (Exception e){
			System.out.println("请求异常");
			throw new RuntimeException(e);
		} finally{
			get.abort();
		}
		return result;
	}
	
	public static String getHttpEntityContent(HttpResponse response) throws UnsupportedOperationException, IOException{
		String result = "";
		HttpEntity entity = response.getEntity();
		if(entity != null){
			InputStream in = entity.getContent();
			BufferedReader br = new BufferedReader(new InputStreamReader(in, "utf-8"));
			StringBuilder strber= new StringBuilder();
			String line = null;
			while((line = br.readLine())!=null){
				strber.append(line+'\n');
			}
			br.close();
			in.close();
			result = strber.toString();
		}
		
		return result;
		
	}

}

(2) Get request parameters manner

/**
 * 
 */
package com.inspur;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URI;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.NameValuePair;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.utils.URLEncodedUtils;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;

import net.sf.json.JSONObject;

/**
 * ClassName: contect_flask
 * Function: TODO ADD FUNCTION
 * @author: xuzheng
 * date: 2019-7-1 下午2:03:00
 */
public class contect_flask {
 
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Map<String, String> map = new HashMap<String, String>();
		map.put("name",	"root");
		map.put("password", "123456");
		String result = contect_flask.get(map, "http://172.30.12.188:5003/test/hello");
		
		System.out.println(result);
		
	}
	
	public static String get(Map<String, String> paramMap, String url){
		String result = "";
		HttpGet get = new HttpGet(url);
		try{
			CloseableHttpClient httpClient = HttpClients.createDefault();
			List<NameValuePair> params = setHttpParams(paramMap);
			String param = URLEncodedUtils.format(params, "UTF-8");
			get.setURI(URI.create(url + "?" + param));
			HttpResponse response = httpClient.execute(get);
			result = getHttpEntityContent(response);
			
			if(response.getStatusLine().getStatusCode()!=HttpStatus.SC_OK){
				result = "服务器异常";
			}
		} catch (Exception e){
			System.out.println("请求异常");
			throw new RuntimeException(e);
		} finally{
			get.abort();
		}
		return result;
	}
	
	public static List<NameValuePair> setHttpParams(Map<String, String> paramMap){
		List<NameValuePair> params = new ArrayList<NameValuePair>();
		Set<Map.Entry<String, String>> set = paramMap.entrySet();
		for(Map.Entry<String, String> entry : set){
			params.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
		}
		return params;
	}
	
	public static String getHttpEntityContent(HttpResponse response) throws UnsupportedOperationException, IOException{
		String result = "";
		HttpEntity entity = response.getEntity();
		if(entity != null){
			InputStream in = entity.getContent();
			BufferedReader br = new BufferedReader(new InputStreamReader(in, "utf-8"));
			StringBuilder strber= new StringBuilder();
			String line = null;
			while((line = br.readLine())!=null){
				strber.append(line+'\n');
			}
			br.close();
			in.close();
			result = strber.toString();
		}
		
		return result;	
	}
}

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