android 访问网络二 （基于httpurlconnection post）

1、网络请求中，post方式请求的参数是在请求体中带给服务器端的 并且需要设置内容与长度的头信息

下面一个简单登录示例：

        String path = "http://192.168.1.96:8080/Loginfromphone/login";        URL url = new URL(path);        HttpURLConnection conn = (HttpURLConnection) url.openConnection();

<span style="white-space:pre"></span>//设置可以用服务器端写数据conn.setDoOutput(true);

<span style="white-space:pre"></span>//设置链接超时conn.setConnectTimeout(5000);

<span style="white-space:pre"></span>//post请求方式conn.setRequestMethod("POST");        // Content-Type: application/x-www-form-urlencodedconn.setRequestProperty("Content-Type","application/x-www-form-urlencoded");<span style="white-space:pre"></span>String content = "username="+ URLEncoder.encode(name, "utf-8") + "&password="+ URLEncoder.encode(pwd, "utf-8");<span style="white-space:pre"></span>// Content-Length: 20conn.setRequestProperty("Content-Length", content.length()+ "");conn.getOutputStream().write(content.getBytes("utf-8"));int code = conn.getResponseCode();if (code == 200) {InputStream in = conn.getInputStream();String data = StreamTool.stream2String(in);Message msg = Message.obtain();msg.what = SUCEESS;msg.obj = data;handler.sendMessage(msg);} else {handler.sendEmptyMessage(ERROR);}

<span style="white-space:pre"></span>private Handler handler = new Handler() {public void handleMessage(android.os.Message msg) {switch (msg.what) {case SUCEESS:Toast.makeText(MainActivity.this, (String) msg.obj, 0).show();break;case ERROR:Toast.makeText(MainActivity.this, "请求有误", 0).show();break;case NET_ERROR:Toast.makeText(MainActivity.this, "网络异常", 0).show();break;default:break;}};};