Java GetAndPost
import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.io.OutputStream;import java.io.PrintWriter;import java.net.HttpURLConnection;import java.net.URL;import java.net.URLConnection;import java.util.List;import java.util.Map;public class HttpRequest {/** * 向指定URL发送GET方法的请求 ** @param url *发送请求的URL * @param param *请求参数，请求参数应该是 name1=value1&name2=value2 的形式。 * @return URL 所代表远程资源的响应结果 */public static String sendGet(String url, String param) {String result = “”;BufferedReader in = null;try {String urlNameString = url + “?” + param;URL realUrl = new URL(urlNameString);// 打开和URL之间的连接URLConnection connection = realUrl.openConnection();// 设置通用的请求属性connection.setRequestProperty(“accept”, “*/*”);connection.setRequestProperty(“connection”, “Keep-Alive”);connection.setRequestProperty(“user-agent”,”Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)”);// 建立实际的连接connection.connect();// 获取所有响应头字段/** Map<String, List<String>> map = connection.getHeaderFields(); //* 遍历所有的响应头字段 for (String key : map.keySet()) {* System.out.println(key + “—>” + map.get(key)); }*/// 定义 BufferedReader输入流来读取URL的响应in = new BufferedReader(new InputStreamReader(connection.getInputStream()));String line;while ((line = in.readLine()) != null) {result += line;}} catch (Exception e) {System.out.println(“发送GET请求出现异常！” + e);e.printStackTrace();}// 使用finally块来关闭输入流finally {try {if (in != null) {in.close();}} catch (Exception e2) {e2.printStackTrace();}}return result;}/** * 向指定 URL 发送POST方法的请求 ** @param url *发送请求的 URL * @param param *请求参数，请求参数应该是 name1=value1&name2=value2 的形式。 * @return 所代表远程资源的响应结果 */public static String sendPost(String url, String param) {PrintWriter out = null;BufferedReader in = null;String result = “”;try {URL realUrl = new URL(url);// 打开和URL之间的连接URLConnection conn = realUrl.openConnection();// 设置通用的请求属性conn.setRequestProperty(“accept”, “*/*”);conn.setRequestProperty(“connection”, “Keep-Alive”);conn.setRequestProperty(“user-agent”,”Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)”);// 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 PrintWriter(conn.getOutputStream());// 发送请求参数out.print(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()));String line;while ((line = in.readLine()) != null) {result += line;}} catch (Exception e) {System.out.println(“发送 POST 请求出现异常！” + e);e.printStackTrace();}// 使用finally块来关闭输出流、输入流finally {try {if (out != null) {out.close();}if (in != null) {in.close();}} catch (IOException ex) {ex.printStackTrace();}}return result;}}
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