Android中使用HttpURLConnection和HttpClient实现GET和POST请求访问网络

HttpURLConnection中的GET

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Base64;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {
private EditText content;   //声明一个输入文本内容的编辑框对象
private Button button;  //声明一个发表按钮对象
private Handler handler; // 声明一个Handler对象
private String result = ""; //声明一个代表显示内容的字符串
private TextView resultTV;  //声明一个显示结果的文本框对象

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
content = (EditText) findViewById(R.id.content);    //获取输入文本内容的EditText组件
resultTV = (TextView) findViewById(R.id.result);    //获取显示结果的TextView组件
button = (Button) findViewById(R.id.button);    //获取“发表”按钮组件
//为按钮添加单击事件监听器
button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if ("".equals(content.getText().toString())) {
Toast.makeText(MainActivity.this, "请输入要发表的内容！",
Toast.LENGTH_SHORT).show(); //显示消息提示
return;
}

// 创建一个新线程，用于发送并读取微博信息
new Thread(new Runnable() {
public void run() {
send(); //发送文本内容到Web服务器
Message m = handler.obtainMessage(); // 获取一个Message
handler.sendMessage(m); // 发送消息
}
}).start(); // 开启线程
}
});
//创建一个Handler对象
handler = new Handler() {
@Override
public void handleMessage(Message msg) {
if (result != null) {
resultTV.setText(result); // 显示获得的结果
content.setText("");        //清空文本框
}
super.handleMessage(msg);
}
};
}

public void send() {
String target="";
target = "http://192.168.1.66:8081/blog/index.jsp?content="
+base64(content.getText().toString().trim());   //要访问的URL地址
URL url;
try {
url = new URL(target);
HttpURLConnection urlConn = (HttpURLConnection) url
.openConnection();  //创建一个HTTP连接
InputStreamReader in = new InputStreamReader(
urlConn.getInputStream()); // 获得读取的内容
BufferedReader buffer = new BufferedReader(in); // 获取输入流对象
String inputLine = null;
//通过循环逐行读取输入流中的内容
while ((inputLine = buffer.readLine()) != null) {
result += inputLine + "\n";
}
in.close(); //关闭字符输入流对象
urlConn.disconnect();   //断开连接
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
//对字符串进行Base64编码
public String base64(String content){
try {
content=Base64.encodeToString(content.getBytes("utf-8"), Base64.DEFAULT);   //对字符串进行Base64编码
content=URLEncoder.encode(content); //对字符串进行URL编码
} catch (UnsupportedEncodingException e) {
e.printStackTrace();    //输出异常信息
}
return content;
}
}

HttpURLConnection中的POST

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {
private EditText nickname; // 声明一个输入昵称的编辑框对象
private EditText content; // 声明一个输入文本内容的编辑框对象
private Button button; // 声明一个发表按钮对象
private Handler handler; // 声明一个Handler对象
private String result = ""; // 声明一个代表显示内容的字符串
private TextView resultTV; // 声明一个显示结果的文本框对象

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
content = (EditText) findViewById(R.id.content); // 获取输入文本内容的EditText组件
resultTV = (TextView) findViewById(R.id.result); // 获取显示结果的TextView组件
nickname = (EditText) findViewById(R.id.nickname); // 获取输入昵称的EditText组件
button = (Button) findViewById(R.id.button); // 获取“发表”按钮组件
// 为按钮添加单击事件监听器
button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if ("".equals(nickname.getText().toString())
|| "".equals(content.getText().toString())) {
Toast.makeText(MainActivity.this, "请将内容输入完整！",
Toast.LENGTH_SHORT).show();
return;
}

// 创建一个新线程，用于从网络上获取文件
new Thread(new Runnable() {
public void run() {
send();
Message m = handler.obtainMessage(); // 获取一个Message
handler.sendMessage(m); // 发送消息
}
}).start(); // 开启线程

}
});
handler = new Handler() {
@Override
public void handleMessage(Message msg) {
if (result != null) {
resultTV.setText(result); // 显示获得的结果
content.setText(""); // 清空内容编辑框
nickname.setText(""); // 清空昵称编辑框
}
super.handleMessage(msg);
}
};
}

public void send() {
String target = "http://192.168.1.66:8081/blog/dealPost.jsp";   //要提交的目标地址
URL url;
try {
url = new URL(target);
HttpURLConnection urlConn = (HttpURLConnection) url
.openConnection(); // 创建一个HTTP连接
urlConn.setRequestMethod("POST"); // 指定使用POST请求方式
urlConn.setDoInput(true); // 向连接中写入数据
urlConn.setDoOutput(true); // 从连接中读取数据
urlConn.setUseCaches(false); // 禁止缓存
urlConn.setInstanceFollowRedirects(true);   //自动执行HTTP重定向
urlConn.setRequestProperty("Content-Type",
"application/x-www-form-urlencoded"); // 设置内容类型
DataOutputStream out = new DataOutputStream(
urlConn.getOutputStream()); // 获取输出流
String param = "nickname="
+ URLEncoder.encode(nickname.getText().toString(), "utf-8")
+ "&content="
+ URLEncoder.encode(content.getText().toString(), "utf-8"); //连接要提交的数据
out.writeBytes(param);//将要传递的数据写入数据输出流
out.flush();    //输出缓存
out.close();    //关闭数据输出流
// 判断是否响应成功
if (urlConn.getResponseCode() == HttpURLConnection.HTTP_OK) {
InputStreamReader in = new InputStreamReader(
urlConn.getInputStream()); // 获得读取的内容
BufferedReader buffer = new BufferedReader(in); // 获取输入流对象
String inputLine = null;
while ((inputLine = buffer.readLine()) != null) {
result += inputLine + "\n";
}
in.close(); //关闭字符输入流
}
urlConn.disconnect();   //断开连接
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}

HttpClient的GET

public void send() {
String target = "http://192.168.1.66:8081/blog/deal_httpclient.jsp?param=get";  //要提交的目标地址
HttpClient httpclient = new DefaultHttpClient();//创建HttpClient对象
HttpGet httpRequest = new HttpGet(target);  //创建HttpGet连接对象
HttpResponse httpResponse;
try {
httpResponse = httpclient.execute(httpRequest); //执行HttpClient请求
if (httpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK){
result = EntityUtils.toString(httpResponse.getEntity());    //获取返回的字符串
}else{
result="请求失败！";
}
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}

HttpClient的POST

public void send() {
String target = "http://192.168.1.66:8081/blog/deal_httpclient.jsp";    //要提交的目标地址
HttpClient httpclient = new DefaultHttpClient();    //创建HttpClient对象
HttpPost httpRequest = new HttpPost(target);    //创建HttpPost对象
//将要传递的参数保存到List集合中
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("param", "post"));    //标记参数
params.add(new BasicNameValuePair("nickname", nickname.getText().toString()));  //昵称
params.add(new BasicNameValuePair("content", content.getText().toString()));    //内容
try {
httpRequest.setEntity(new UrlEncodedFormEntity(params, "utf-8")); //设置编码方式
HttpResponse httpResponse = httpclient.execute(httpRequest);    //执行HttpClient请求
if (httpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK){  //如果请求成功
result += EntityUtils.toString(httpResponse.getEntity());   //获取返回的字符串

}else{
result = "请求失败！";
}
} catch (UnsupportedEncodingException e1) {
e1.printStackTrace();   //输出异常信息
} catch (ClientProtocolException e) {
e.printStackTrace();    //输出异常信息
} catch (IOException e) {
e.printStackTrace();    //输出异常信息
}
}