java客户端程序和服务器http通讯

电玩女神 2021-12-16 00:49 285阅读 0赞

需要依赖的jar包有：  
commons-beanutils.jar  
commons-collections-3.2.2.jar  
commons-lang-2.4.jar  
commons-logging.jar  
ezmorph-1.0.6.jar  
httpclient-4.5.jar  
httpcore-4.4.1.jar  
json-lib-2.2.2-jdk15.jar

[可以点击这里下载这几个jar文件][jar]

package com.devide.util;
    
    import java.io.IOException;
    
    import org.apache.http.HttpEntity;
    import org.apache.http.client.ClientProtocolException;
    import org.apache.http.client.methods.CloseableHttpResponse;
    import org.apache.http.client.methods.HttpPost;
    import org.apache.http.config.Registry;
    import org.apache.http.config.RegistryBuilder;
    import org.apache.http.conn.socket.ConnectionSocketFactory;
    import org.apache.http.conn.socket.PlainConnectionSocketFactory;
    import org.apache.http.entity.StringEntity;
    import org.apache.http.impl.client.CloseableHttpClient;
    import org.apache.http.impl.client.HttpClients;
    import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
    import org.apache.http.util.EntityUtils;
    
    import net.sf.json.JSONArray;
    import net.sf.json.JSONObject;
    
    /**
     * 和服务器通讯的工具类
     * @author Administrator
     *
     */
    public class HttpUtil {
    	public static final String URL = "http://192.168.168.168:8080/DivideClassServer/getData";
    	
    	public static String sendPost(String url, String jsonParams, 
    			String encoding) throws ClientProtocolException, IOException
    	{
    		int statusCode = 0;
    		String body = "";
    		String resultCode = "";
    
    		// 设置协议http和https对应的处理socket链接工厂的对象
    		Registry<ConnectionSocketFactory> socketFactoryRegistry = RegistryBuilder.<ConnectionSocketFactory> create()
    				.register("http", PlainConnectionSocketFactory.INSTANCE).build();
    
    		PoolingHttpClientConnectionManager connManager = new PoolingHttpClientConnectionManager(socketFactoryRegistry);
    		HttpClients.custom().setConnectionManager(connManager);
    
    		// 创建自定义的httpclient对象
    		CloseableHttpClient client = HttpClients.custom().setConnectionManager(connManager).build();
    		// 创建post方式请求对象
    		HttpPost httpPost = new HttpPost(url);
    		
    		StringEntity uefEntity = new StringEntity(jsonParams, encoding);
    		uefEntity.setContentType("application/json");
    
    		// 设置参数到请求对象中
    		httpPost.setEntity(uefEntity);
    
    		// 执行请求操作，并拿到结果（同步阻塞）
    		CloseableHttpResponse response = client.execute(httpPost);
    
    		statusCode = response.getStatusLine().getStatusCode();
    
    		if (200 != statusCode) 
    		{
    			resultCode = "-1";
    			return resultCode;
    		}
    
    		// 获取结果实体
    		HttpEntity entity = response.getEntity();
    		if (entity != null)
    		{
    			// 按指定编码转换结果实体为String类型
    			body = EntityUtils.toString(entity, encoding);
    			resultCode = getJson(body);
    		}
    		EntityUtils.consume(entity);
    
    		// 释放链接
    		response.close();
    		return resultCode;
    	}
    
    	//解析json串,获取resultCode值
    	private static String getJson(String body)
    	{
    		JSONArray arr = JSONArray.fromObject(body);
    		System.out.println("返回的数组长度："+arr.size());
    		System.out.println(arr);
    		if(arr.size()==0) return "";
    		JSONObject obj = null;
    		for (int i = 0; i < arr.size(); i++) {
    		    obj = arr.getJSONObject(i);
    		    System.out.println(obj.toString());
    		 }
    		String resultCode = obj.getString("students");
    		System.out.println("获取到服务器返回的数据："+resultCode);
    		return resultCode;
    	}
    	
    	public static void main(String[] args){
    		String result = HttpUtil.sendPost(URL, "", "utf-8");
    		System.out.println(result);
    	}
    }

[jar]: https://download.csdn.net/download/zcn596785154/11271570