三种POST和GET的提交方式
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向服务器提交数据有两种方式，post和get。两者的区别主要有三点，安全性、长度限制、数据结构。其中get请求安全性相比较而言较差，数据长度受浏览器地址栏限制，没有方法体。两种都是较为重要的数据提交方式。现简单介绍一下三种post和get的提交方式。无论是哪种方法实现post和get，get 的访问路径都要携带数据，而post提交是把数据放在方法体中。
普通方法实现get/post提交：
严格遵照Http协议进行数据传输。在安卓开发环境下，由于主线程不能进行网络访问，因此需要在开启一个子线程向服务器提交数据。为了更加直观的观察数据，可以在程序屏幕上显示服务器反馈信息。又由于子线程无法更改UI界面，因此需要引入Hnndler代理器。实现get/post提交基本步骤就是，获取URL路径，根据路径得到Http连接，用HttpURLConnection对象设置相关的http配置信息、提交方式以及获取反馈码。当响应码为200时表示提交成功，可以通过HttpURLConnection以流的形式获取反馈信息。
普通GRT提交方式：
public void load(View view){
final String qq = et_qq.getText().toString().trim();
final String pwd = et_pwd.getText().toString().trim();
if (TextUtils.isEmpty(qq) || TextUtils.isEmpty(pwd)) {
Toast.makeText(MainActivity.this, "qq号或密码为空", 0).show();
return;
}
final String path = "http://192.168.1.114:8080/qqload/qqload?qq=" + qq
+ "&pwd=" + pwd;
new Thread() {
public void run() {
try {
URL url = new URL(path);
HttpURLConnection conn = (HttpURLConnection) url
.openConnection();
conn.setRequestMethod("GET");
conn.setReadTimeout(5000);
int code = conn.getResponseCode();
if (code == 200) {
InputStream is = conn.getInputStream();
String result = StreamTools.ReadStream(is);
Message msg = Message.obtain();
msg.what = SUCCESS;
msg.obj = result;
handler.sendMessage(msg);
} else {
Message msg = Message.obtain();
msg.what = ERROR1;
handler.sendMessage(msg);
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
Message msg = Message.obtain();
msg.what = ERROR2;
handler.sendMessage(msg);
}
}
}.start();
}
普通POST提交方式：
public void load(View view){ final String qq = et_qq.getText().toString().trim(); final String pwd = et_pwd.getText().toString().trim(); if (TextUtils.isEmpty(qq) || TextUtils.isEmpty(pwd)) { Toast.makeText(MainActivity.this, "qq号或密码为空", 0).show(); return; } final String path = "http://192.168.1.114:8080/qqload/qqload"; new Thread() { public void run() { try { URL url = new URL(path); HttpURLConnection conn = (HttpURLConnection) url .openConnection(); conn.setRequestMethod("POST"); conn.setReadTimeout(5000); conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); String data = "qq="+URLEncoder.encode(qq,"utf-8")+"&pwd=" + URLEncoder.encode(pwd,"utf-8"); conn.setRequestProperty("Content-Length",String.valueOf(data.length())); conn.setDoOutput(true); conn.getOutputStream().write(data.getBytes()); int code = conn.getResponseCode(); if (code == 200) { InputStream is = conn.getInputStream(); String result = StreamTools.ReadStream(is); Message msg = Message.obtain(); msg.what = SUCCESS; msg.obj = result; handler.sendMessage(msg); } else { Message msg = Message.obtain(); msg.what = ERROR1; handler.sendMessage(msg); } } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); Message msg = Message.obtain(); msg.what = ERROR2; handler.sendMessage(msg); } } }.start(); }
用httpclien实现get/post提交的只需要一下几个步骤：
1. 创建HttpClient对象，实现打开浏览器的功能
HttpClient client = new DefaultHttpClient();
2. 输入地址或者数据 ，用到HttpGet()或HttpPost(),传入要访问的路径，得到HttpGet或HttpPost对象。
HttpGet httpGet = new HttpGet(path);
3. 把获得的HttpGet或HttpPost对象发送到服务器，实现敲回车的功能，得到HttpResponse对象。
HttpResponse response = client.execute(httpGet);
4. 得到HttpResponse对象获取状态行中的状态码，判断状态码状态码。
int code = response.getStatusLine().getStatusCode();
5. 同样用HttpResponse对象获取相应内容，存入流对象。最后将得到的流对象转为字符串进行显示。
InputStream is = response.getEntity().getContent();
其中要注意的一点是用post请求时要传递值所以要多出一个步骤。具体而言，先创建一个list集合，集合的泛型用NameValuePair表示，类似于键值对的形式存储要传递的数据。接着向集合中添加要提交数据。最后用HttpPost对象把集合存入请求体中。
用HttpClient实现GET提交：
public void load(View view){ final String qq = et_qq.getText().toString().trim(); final String pwd = et_pwd.getText().toString().trim(); if (TextUtils.isEmpty(qq) || TextUtils.isEmpty(pwd)) { Toast.makeText(MainActivity.this, "qq号或密码为空", 0).show(); return; } final String path = "http://192.168.1.114:8080/qqload/qqload?qq=" + qq + "&pwd=" + pwd; new Thread() { public void run() { try { HttpClient client = new DefaultHttpClient(); HttpGet httpget = new HttpGet(path); HttpResponse response = client.execute(httpget); int code = response.getStatusLine().getStatusCode(); if (code == 200) { InputStream is = response.getEntity().getContent(); String result = StreamTools.ReadStream(is); Message msg = Message.obtain(); msg.what = SUCCESS; msg.obj = result; handler.sendMessage(msg); } else { Message msg = Message.obtain(); msg.what = ERROR1; handler.sendMessage(msg); } } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); Message msg = Message.obtain(); msg.what = ERROR2; handler.sendMessage(msg); } } }.start(); }
用HttpClient实现POST提交：
public void load(View view){ final String qq = et_qq.getText().toString().trim(); final String pwd = et_pwd.getText().toString().trim(); if (TextUtils.isEmpty(qq) || TextUtils.isEmpty(pwd)) { Toast.makeText(MainActivity.this, "qq号或密码为空", 0).show(); return; } final String path = "http://192.168.1.114:8080/qqload/qqload"; new Thread() { public void run() { try { HttpClient client = new DefaultHttpClient(); HttpPost httppost = new HttpPost(path); List<NameValuePair> parameter = new ArrayList(); parameter.add(new BasicNameValuePair("qq", qq)); parameter.add(new BasicNameValuePair("pwd", pwd)); httppost.setEntity(new UrlEncodedFormEntity(parameter,"utf-8")); HttpResponse response = client.execute(httppost); int code = response.getStatusLine().getStatusCode(); if (code == 200) { InputStream is = response.getEntity().getContent(); String result = StreamTools.ReadStream(is); Message msg = Message.obtain(); msg.what = SUCCESS; msg.obj = result; handler.sendMessage(msg); } else { Message msg = Message.obtain(); msg.what = ERROR1; handler.sendMessage(msg); } } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); Message msg = Message.obtain(); msg.what = ERROR2; handler.sendMessage(msg); } } }.start(); }
使用开源框架实现get/post提交：
利用框架实现get/post提交不需要再开启子线程。直接在主线程进行get/post的提交，大大的减少了工作量。但操作前需要导包。然后直接创建一个AsyncHttpClient对象，用AsyncHttpClient对象的post方法和get方法，发送请求，并在AsyncHttpResponseHandler()对象中获得相应信息。同样若是post请求，仍旧需要传递值。这里可以用RequestParams对象添加要传递的值。
在文件下添加jar包：
用开源框架实现GET提交：
public void load(View view){ final String qq = et_qq.getText().toString().trim(); final String pwd = et_pwd.getText().toString().trim(); if (TextUtils.isEmpty(qq) || TextUtils.isEmpty(pwd)) { Toast.makeText(MainActivity.this, "qq号或密码为空", 0).show(); return; } final String path = "http://192.168.1.114:8080/qqload/qqload?qq=" + qq + "&pwd=" + pwd; AsyncHttpClient client = new AsyncHttpClient(); client.get(path, new AsyncHttpResponseHandler() { @Override public void onSuccess(int statusCode, Header[] headers, byte[] responseBody) { // TODO Auto-generated method stub tv_result.setText(new String(responseBody)); } @Override public void onFailure(int statusCode, Header[] headers, byte[] responseBody, Throwable error) { // TODO Auto-generated method stub tv_result.setText("错误原因：" + new String(responseBody)); } }); }
用开源框架实现POST请求：
public void load(View view){ final String qq = et_qq.getText().toString().trim(); final String pwd = et_pwd.getText().toString().trim(); if (TextUtils.isEmpty(qq) || TextUtils.isEmpty(pwd)) { Toast.makeText(MainActivity.this, "qq号或密码为空", 0).show(); return; } final String path = "http://192.168.1.114:8080/qqload/qqload"; AsyncHttpClient client = new AsyncHttpClient(); RequestParams params = new RequestParams(); params.add("qq", qq); params.add("pwd", pwd); client.post(path,params,new AsyncHttpResponseHandler() { @Override public void onSuccess(int statusCode, Header[] headers, byte[] responseBody) { // TODO Auto-generated method stub tv_result.setText(new String(responseBody)); } @Override public void onFailure(int statusCode, Header[] headers, byte[] responseBody, Throwable error) { // TODO Auto-generated method stub tv_result.setText(new String(responseBody)); } }); }
通过以上任何一种方式可以实现的功能是，从安卓手机端提交数据到服务器端，服务器端进行判断，并返回相应的结果。三种方式各有利弊，实现效果相同，在实际的使用过程中可以根据本身的需要进行选择。
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