Android发送GET和POST请求DEMO

4.0后网络访问必须单独起一个子线程访问，否则无法运行，这里有一个发送请求的工具类GetPostUtil

public class GetPostUtil{/** * 向指定URL发送GET方法的请求 *  * @param url *            发送请求的URL * @param params *            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 */public static String sendGet(String url, String params){String result = "";BufferedReader in = null;try{String urlName = url + "?" + params;URL realUrl = new URL(urlName);// 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)");// 建立实际的连接conn.connect();// 获取所有响应头字段Map<String, List<String>> map = conn.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(conn.getInputStream()));String line;while ((line = in.readLine()) != null){result += "\n" + 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 (IOException ex){ex.printStackTrace();}}return result;}/** * 向指定URL发送POST方法的请求 *  * @param url *            发送请求的URL * @param params *            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 */public static String sendPost(String url, String params){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(params);// 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 += "\n" + 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;}}

Activity类代码

public class GetPostMain extends Activity{Button get , post;EditText show;@Overridepublic void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.main);get = (Button) findViewById(R.id.get);post = (Button) findViewById(R.id.post);show = (EditText)findViewById(R.id.show);//利用Handler更新UIfinal Handler h = new Handler(){@Overridepublic void handleMessage(Message msg) {if(msg.what==0x123){show.setText(msg.obj.toString());}}};get.setOnClickListener(new OnClickListener(){@Overridepublic void onClick(View v){new Thread(new AccessNetwork("GET", "http://192.168.1.88:8080/abc/a.jsp", null, h)).start();}});post.setOnClickListener(new OnClickListener(){@Overridepublic void onClick(View v){new Thread(new AccessNetwork("POST", "http://192.168.1.88:8080/abc/login.jsp", "name=crazyit.org&pass=leegang", h)).start();}});}}class AccessNetwork implements Runnable{private String op ;private String url;private String params;private Handler h;public AccessNetwork(String op, String url, String params,Handler h) {super();this.op = op;this.url = url;this.params = params;this.h = h;}@Overridepublic void run() {Message m = new Message();m.what = 0x123;if(op.equals("GET")){Log.i("iiiiiii","发送GET请求");m.obj = GetPostUtil.sendGet(url, params);Log.i("iiiiiii",">>>>>>>>>>>>"+m.obj);}if(op.equals("POST")){Log.i("iiiiiii","发送POST请求");m.obj = GetPostUtil.sendPost(url, params);Log.i("gggggggg",">>>>>>>>>>>>"+m.obj);}h.sendMessage(m);}}