java发送GET、POST请求

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package com.xx;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.io.OutputStreamWriter;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import java.net.URLConnection;import java.util.List;import java.util.Map;public class SendGetPost {/** * 发送get请求 * 参数设置：？param=val¶m2=val2 * @author TF * */public static String sendGet(String url){String result = "";    BufferedReader in = null;try {//创建URL对象、URL urlGet =new URL(url);//打开URL连接URLConnection connection = urlGet.openConnection();//设置请求头信息connection.setRequestProperty("accept", "*/*");        connection.setRequestProperty("connection", "Keep-Alive");        connection.setRequestProperty("user-agent","Mozilla/5.0 (Windows NT 6.1; WOW64; rv:47.0) Gecko/20100101 Firefox/47.0");        connection.setRequestProperty("contentType", "UTF-8");        //建立连接        connection.connect();        // 获取所有响应头字段        Map<String, List<String>> map = connection.getHeaderFields();        // 定义 BufferedReader输入流来读取URL的响应        in = new BufferedReader(new InputStreamReader(connection.getInputStream(),"UTF-8"));        String line;            while ((line = in.readLine()) != null) {            result += line;            }} catch (MalformedURLException e) {System.out.println("error");e.printStackTrace();} catch (IOException e) {e.printStackTrace();}return result;}/** * 发送post请求 * 参数设置param1=val1¶m2=val2 * @param TF * */public static String sendPost(String url,String param){String result = "";    BufferedReader in = null;    OutputStreamWriter out = null;try {//创建URL对象、URL urlPost = new URL(url);//打开URL连接URLConnection connection = urlPost.openConnection();HttpURLConnection conn = (HttpURLConnection) connection; // 设置通用的请求属性          conn.setRequestProperty("accept", "*/*");          conn.setRequestProperty("connection", "Keep-Alive");          conn.setRequestProperty("user-agent","Mozilla/5.0 (Windows NT 6.1; WOW64; rv:47.0) Gecko/20100101 Firefox/47.0");          conn.setRequestMethod("POST");          // 发送POST请求必须设置如下两行          conn.setDoOutput(true);          conn.setDoInput(true);          // 获取URLConnection对象对应的输出流          out = new OutputStreamWriter(conn.getOutputStream(),"UTF-8");          // 发送请求参数          out.write(param);          // flush输出流的缓冲          out.flush();       // 定义BufferedReader输入流来读取URL的响应          in = new BufferedReader(                  new InputStreamReader(conn.getInputStream(),"UTF-8"));          String line;          while ((line = in.readLine()) != null) {              result += line;          }} catch (MalformedURLException e) {System.out.println("error");e.printStackTrace();} catch (IOException e) {e.printStackTrace();}return result;}}
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