Java URLConnection GET请求、POST请求

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/**  * 程序示范了如何向web站点发送GET请求、POST请求，并从web站点取得响应  */package codes17;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.io.PrintWriter;import java.net.MalformedURLException;import java.net.URL;import java.net.URLConnection;import java.util.List;import java.util.Map;public class GetPostTest {/** * 向指定URL发送GET方式的请求 * @param url 发送请求的URL * @param param 请求参数，格式满足name1=value1&name2=value2的形式 * @return URL 代表远程资源的相应 */public static String sendGet(String url, String param) {String result = "";String urlName = url + "?" + param;BufferedReader in = null;try {URL realUrl = new URL(urlName);URLConnection conn = realUrl.openConnection(); // 打开和URL之间的连接conn.setRequestProperty("Accept", "*/*"); // 设置通用的请求属性conn.setRequestProperty("user-agent","Mozilla/30.0(compatible; MSIE 9.0; Windows NT 5.1; SV1)");conn.setRequestProperty("connection", "Keep-Alived");conn.connect();Map<String, List<String>> map = conn.getHeaderFields(); // 获取所有的响应头字段for (String key : map.keySet()) { // 遍历所有的响应头字段System.out.println(key + "--->" + map.get(key));}in = new BufferedReader(new InputStreamReader(conn.getInputStream(), "utf-8")); // 定义BufferedReader输入流来读取URL的响应String line;while ((line = in.readLine()) != null) {result += "\n" + line;}} catch (MalformedURLException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();} finally {if (in != null)try {in.close();} catch (IOException e) {e.printStackTrace();}}return result;}/** * 向指定URL发送POST方式的请求 * @param url 发送请求的URL * @param param 请求参数，格式满足name1=value1&name2=value2的形式 * @return URL 代表远程资源的相应 */public static String sendPost(String url, String param) {String result = "";URL realUrl;PrintWriter out = null;BufferedReader in = null;try {realUrl = new URL(url);URLConnection conn = realUrl.openConnection(); // 打开和URL之间的连接conn.setRequestProperty("Accept", "*/*"); // 设置通用的请求属性conn.setRequestProperty("user-agent","Mozilla/30.0(compatible; MSIE 9.0; Windows NT 5.1; SV1)");conn.setRequestProperty("connection", "Keep-Alived");// 发送POST请求必须设置以下两行conn.setDoOutput(true);conn.setDoInput(true);out = new PrintWriter(conn.getOutputStream()); // 获取URLConnection对象对应的输出流out.print(param); // 发送请求参数in = new BufferedReader(new InputStreamReader(conn.getInputStream(), "utf-8"));String line;while ((line = in.readLine()) != null) {result += "\n" + line;}} catch (MalformedURLException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();} finally {try {if (out != null)out.close();if (in != null)in.close();} catch (IOException e) {e.printStackTrace();}}return result;}/** * 提供主方法，测试发送GET请求和POST请求 */public static void main(String[] args) {String s1 = GetPostTest.sendGet("http://localhost/a.jsp", null); // 发送GET请求System.out.println(s1);String s2 = GetPostTest.sendPost("http://localhost/login.jsp","name=crazyit.org&pass=leegang"); // 发送POST请求System.out.println(s2);}}
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