Java发送http请求

结合网络资源，整理Java调用http请求调用接口 等 方法。

 

代码如下：

package com.sgcy.sendPost;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.nio.charset.Charset;
import java.util.Map;

public class SendHttpRequestter {

	private String defaultContentEncoding;

	public SendHttpRequestter() {
		this.defaultContentEncoding = Charset.defaultCharset().name();
	}
	
	/**
	 * 发送Get请求
	 * @param urlString
	 * @param params
	 * @return
	 */
	public String sendGet(String url, Map<String, String> params){
		return this.send(url, "GET", params);
	}
	
	
	/**
	 * 发送post请求
	 * @param urlString URL路径
	 * @param params 传递的参数
	 * @return
	 */
	public String sendPost(String url, Map<String, String> params){
		return this.send(url, "POST", params);
	}
	
	/**
	 * 发送HTTP请求
	 * 
	 * @param urlString
	 * @return 请求结果
	 */
	private String send(String urlStr, String method,
			Map<String, String> parameters){
		HttpURLConnection urlConnection = null;

		//封装Get请求路径，Get为不加密请求路径 
		if (method.equalsIgnoreCase("GET") && parameters != null) {
			StringBuffer param = new StringBuffer();
			int i = 0;
			for (String key : parameters.keySet()) {
				if (i == 0)
					param.append("?");
				else
					param.append("&");
				param.append(key).append("=").append(parameters.get(key));
				i++;
			}
			urlStr += param;
		}
		
		try {
			URL url = new URL(urlStr);
			//请求配置，可根据实际情况采用灵活配置
			urlConnection = (HttpURLConnection) url.openConnection();
			urlConnection.setRequestMethod(method);
			urlConnection.setDoOutput(true);
			urlConnection.setDoInput(true);
			urlConnection.setUseCaches(false);
			urlConnection.setConnectTimeout(5000);
			urlConnection.setRequestProperty("Charsert", "UTF-8");
			urlConnection.setRequestProperty("Content-Type", "application/json");
			//封装post请求参数，
			if (method.equals("POST") && parameters != null) {
				StringBuffer param = new StringBuffer();
				param.append("{");
				param.append("\"userid\"").append(":\"").append(parameters.get("userid"));// "\"userid\"" \标识强转"号，因为参数传递时需要使用""
				param.append("\"}");
				
				urlConnection.getOutputStream().write(param.toString().getBytes());//写入参数，必须为byte  OutputStream 只能接收byte类型
				urlConnection.getOutputStream().flush();
				urlConnection.getOutputStream().close();
				urlConnection.connect();
			}
			//调用http请求
			return this.makeContent(urlConnection);
		} catch (Exception e) {
			e.printStackTrace();
			return "0000";//异常返回0000
		}
	}
	
	/**
	 * 得到响应对象
	 * 
	 * @param urlConnection
	 * @return 响应对象
	 * @throws Exception
	 */
	private String makeContent(HttpURLConnection urlConnection){
		try {
			InputStream in = urlConnection.getInputStream();
			BufferedReader bufferedReader = new BufferedReader(
					new InputStreamReader(in, "UTF-8"));
			StringBuffer temp = new StringBuffer();
			String line = bufferedReader.readLine();
			while (line != null) {
				temp.append(line);
				line = bufferedReader.readLine();
			}
			bufferedReader.close();

			JSONObject jsonObject = new JSONObject(temp.toString());
			return jsonObject.get("result").toString();//result 为接口返回json数据对象key值
		} catch (Exception e) {
			e.printStackTrace();
			return "0000";//异常返回0000
		} finally {
			if (urlConnection != null)
				urlConnection.disconnect();
		}
	}
	
	
	/**
	 * 默认的响应字符集
	 */
	public String getDefaultContentEncoding() {
		return this.defaultContentEncoding;
	}

	/**
	 * 设置默认的响应字符集
	 */
	public void setDefaultContentEncoding(String defaultContentEncoding) {
		this.defaultContentEncoding = defaultContentEncoding;
	}
}

 

注明：代码中因数据格式问题，采用了json 转换数据格式，后附json包。