Android HTTP实例 使用GET方法和POST方法发送请求

Android HTTP实例 使用GET方法和POST方法发送请求

Web程序：使用GET和POST方法发送请求

　　首先利用MyEclispe+Tomcat写好一个Web程序，实现的功能就是提交用户信息：用户名和年龄，使用GET和POST两种提交方式。

　　用浏览器打开：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Username:" />

<EditText
android:id="@+id/name"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="text" />

<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="User Age:" />

<EditText
android:id="@+id/age"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="number" />

<Button
android:id="@+id/submit_get"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Submit using GET" />

<Button
android:id="@+id/submit_post"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Submit using POST" />

<TextView
android:id="@+id/result"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="#0000FF"
android:textSize="14sp">
</TextView>

</LinearLayout>

activity_http_demo2.xml

主要Activity代码如下：

package com.example.httpdemo2;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
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.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 android.os.Bundle;
import android.app.Activity;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class HttpDemo2Activity extends Activity
{
private String TAG = "http";
private EditText mNameText = null;
private EditText mAgeText = null;

private Button getButton = null;
private Button postButton = null;

private TextView mResult = null;

// 基本地址：服务器ip地址：端口号/Web项目逻辑地址+目标页面（Servlet）的url-pattern
private String baseURL = "http://192.168.11.6:8080/HelloWeb/servlet/WelcomeUserServlet";

@Override
protected void onCreate(Bundle savedInstanceState)
{
Log.i(TAG, "onCreate");
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_http_demo2);

mNameText = (EditText) findViewById(R.id.name);
mAgeText = (EditText) findViewById(R.id.age);
mResult = (TextView) findViewById(R.id.result);

getButton = (Button) findViewById(R.id.submit_get);
getButton.setOnClickListener(mGetClickListener);
postButton = (Button) findViewById(R.id.submit_post);
postButton.setOnClickListener(mPostClickListener);
}

private OnClickListener mGetClickListener = new View.OnClickListener()
{

@Override
public void onClick(View v)
{
Log.i(TAG, "GET request");
// 先获取用户名和年龄
String name = mNameText.getText().toString();
String age = mAgeText.getText().toString();

// 使用GET方法发送请求,需要把参数加在URL后面，用？连接，参数之间用&分隔
String url = baseURL + "?username=" + name + "&age=" + age;

// 生成请求对象
HttpGet httpGet = new HttpGet(url);
HttpClient httpClient = new DefaultHttpClient();

// 发送请求
try
{

HttpResponse response = httpClient.execute(httpGet);

// 显示响应
showResponseResult(response);// 一个私有方法，将响应结果显示出来

}
catch (Exception e)
{
e.printStackTrace();
}

}
};

private OnClickListener mPostClickListener = new View.OnClickListener()
{

@Override
public void onClick(View v)
{
Log.i(TAG, "POST request");
// 先获取用户名和年龄
String name = mNameText.getText().toString();
String age = mAgeText.getText().toString();

NameValuePair pair1 = new BasicNameValuePair("username", name);
NameValuePair pair2 = new BasicNameValuePair("age", age);

List<NameValuePair> pairList = new ArrayList<NameValuePair>();
pairList.add(pair1);
pairList.add(pair2);

try
{
HttpEntity requestHttpEntity = new UrlEncodedFormEntity(
pairList);
// URL使用基本URL即可，其中不需要加参数
HttpPost httpPost = new HttpPost(baseURL);
// 将请求体内容加入请求中
httpPost.setEntity(requestHttpEntity);
// 需要客户端对象来发送请求
HttpClient httpClient = new DefaultHttpClient();
// 发送请求
HttpResponse response = httpClient.execute(httpPost);
// 显示响应
showResponseResult(response);
}
catch (Exception e)
{
e.printStackTrace();
}

}
};

/**
* 显示响应结果到命令行和TextView
* @param response
*/
private void showResponseResult(HttpResponse response)
{
if (null == response)
{
return;
}

HttpEntity httpEntity = response.getEntity();
try
{
InputStream inputStream = httpEntity.getContent();
BufferedReader reader = new BufferedReader(new InputStreamReader(
inputStream));
String result = "";
String line = "";
while (null != (line = reader.readLine()))
{
result += line;

}

System.out.println(result);
mResult.setText("Response Content from server: " + result);
}
catch (Exception e)
{
e.printStackTrace();
}

}

}

　　可以从中对比GET方法和POST方法的区别：

　　GET方法需要用？将参数连接在URL后面，各个参数之间用&连接。

　　POST方法发送请求时，仍然使用基本的URL，将参数信息放在请求实体中发送。

　　关于这点的讨论也可以查看本博客其他文章：

　　/article/4671959.html

　　/article/4671976.html

　　

　　程序运行结果如下：

参考资料

　　Android开发视频教程HTTP操作。——http://www.marsdroid.org

　　Android Reference: package org.apache.http:

　　http://developer.android.com/reference/org/apache/http/package-summary.html

　　之前文章中，关于GET和POST的更多讨论：

　　/article/4671959.html

　　/article/4671976.html