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Android--httpclient模拟post请求和get请求分析
HttpClient的使用模式：
1. 创建一个HttpClent
2.实例化新的HTTP方法，比如PostMethod 或 GetMethod
3.设置HTTP参数名称/值
4.使用HttpClent执行HTTP调用
5.处理Http响应
import java.io.IOException;
import java.io.InputStream;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.StatusLine;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import com.itheima.httpclient.utils.Utils;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
public class MainActivity extends Activity {
Handler handler = new Handler(){
@Override
public void handleMessage(android.os.Message msg) {
Toast.makeText(MainActivity.this, (String)msg.obj, 0).show();
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
//get方法
public void get(View v){
EditText et_name = (EditText) findViewById(R.id.et_name);
EditText et_pass = (EditText) findViewById(R.id.et_pass);
final String name = et_name.getText().toString();
final String pass = et_pass.getText().toString();
Thread t = new Thread(){
@Override
public void run() {
String path = "http://192.168.13.13/Web/servlet/CheckLogin?name=" + URLEncoder.encode(name) + "&pass=" + pass;
//使用httpClient框架做get方式提交
//1.创建HttpClient对象
HttpClient hc = new DefaultHttpClient();
//2.创建httpGet对象，构造方法的参数就是网址
HttpGet hg = new HttpGet(path);
//3.使用客户端对象，把get请求对象发送出去
try {
HttpResponse hr = hc.execute(hg);
//拿到响应头中的状态行
StatusLine sl = hr.getStatusLine();
if(sl.getStatusCode() == 200){
//拿到响应头的实体
HttpEntity he = hr.getEntity();
//拿到实体中的内容，其实就是服务器返回的输入流
InputStream is = he.getContent();
String text = Utils.getTextFromStream(is);
//发送消息，让主线程刷新ui显示text
Message msg = handler.obtainMessage();
msg.obj = text;
handler.sendMessage(msg);
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
};
t.start();
}
//post方法
public void post(View v){
EditText et_name = (EditText) findViewById(R.id.et_name);
EditText et_pass = (EditText) findViewById(R.id.et_pass);
final String name = et_name.getText().toString();
final String pass = et_pass.getText().toString();
Thread t = new Thread(){
@Override
public void run() {
String path = "http://192.168.13.13/Web/servlet/CheckLogin";
//1.创建客户端对象
HttpClient hc = new DefaultHttpClient();
//2.创建post请求对象
HttpPost hp = new HttpPost(path);
//封装form表单提交的数据
BasicNameValuePair bnvp = new BasicNameValuePair("name", name);
BasicNameValuePair bnvp2 = new BasicNameValuePair("pass", pass);
List parameters = new ArrayList();
//把BasicNameValuePair放入集合中
parameters.add(bnvp);
parameters.add(bnvp2);
try {
//要提交的数据都已经在集合中了，把集合传给实体对象
UrlEncodedFormEntity entity = new UrlEncodedFormEntity(parameters, "utf-8");
//设置post请求对象的实体，其实就是把要提交的数据封装至post请求的输出流中
hp.setEntity(entity);
//3.使用客户端发送post请求
HttpResponse hr = hc.execute(hp);
if(hr.getStatusLine().getStatusCode() == 200){
InputStream is = hr.getEntity().getContent();
String text = Utils.getTextFromStream(is);
//发送消息，让主线程刷新ui显示text
Message msg = handler.obtainMessage();
msg.obj = text;
handler.sendMessage(msg);
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
};
t.start();
}
}
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
public class Utils {
public static String getTextFromStream(InputStream is){
byte[] b = new byte[1024];
int len = 0;
ByteArrayOutputStream bos = new ByteArrayOutputStream();
try {
while((len = is.read(b)) != -1){
bos.write(b, 0, len);
}
String text = new String(bos.toByteArray());
bos.close();
return text;
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
}
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