get

  服务端接收客服端数据，通过http协议

之前的两个例子都是客服端解析服务端的数据，然而在实际应用中，客服端发送数据给服务端也是一个很重要的方面。比如客服端输入用户名和密码后，要给服务端接收，最后在数据库里面去查找看是否有这个用户
  本文以get方式发送数据给服务端

  服务器端

   就是一个Servlet

package com.lin.servlet;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

 /*
  * 1、get方式提交请求参数，没有对中文参数编码
  * tomcat默认iso8859编码，转成二进制数据
  */
public class ManageServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    
    public ManageServlet() {
       
    }

 
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		String title= request.getParameter("title");
		String timelength= request.getParameter("length");
		/*
		 * 保存到数据库中
		 */
		 System.out.println("视频"+title);
		 System.out.println("时长"+timelength);
	}

	 
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
	
		doGet(request, response);
	}

}

   在浏览器里输入：http://localhost:8080/videonews/ManageServlet?title=woshizhu&length=23

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Servlet会打印

视频woshizhu
时长23

那么，如何在android客服端完成这个效果呢

也就是说，如何在手机上自己输入两项参数，然后手机的数据就会被Servlet接收呢？

好，我们新建一个android工程

layout.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/title" />

<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/title"
/>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/timelength" />

<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/timelength"
android:numeric="integer"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/button"
android:text="@string/button"
/>
</LinearLayout>

 

Activity

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

import com.lin.servce.NewsService;
 
public class NewsmanageActivity extends Activity {
    /** Called when the activity is first created. */
	public EditText etitle;
	public EditText etimelength;
	public Button button;
	boolean result;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        init();
       button.setOnClickListener(new View.OnClickListener() {
		
		public void onClick(View v) {
			// TODO Auto-generated method stub
			new Thread(new Runnable() {
				
				public void run() {
					// TODO Auto-generated method stub
					String title=etitle.getText().toString();
			    	String length=etimelength.getText().toString();
			    	  result=NewsService.save(title,length);
					 Message msg = new Message();
                     msg.what = 1;
                      handler.sendMessage(msg);  
				}
			}){}.start();
		}
	});
    }
 Handler handler=new Handler(){
    	
    	public void handleMessage(Message msg) {
    		  if (msg.what == 1) {
    			  if(result){
   		    		Toast.makeText(getApplicationContext(), R.string.success, 2).show();
    		    	}else{
    		    		Toast.makeText(getApplicationContext(), R.string.error, 2).show();
    		
    		    	}
	            }
    	};
    	
    };
    private void init() {
		// TODO Auto-generated method stub
		etitle=(EditText) findViewById(R.id.title);
		etimelength=(EditText) findViewById(R.id.timelength);
		button=(Button) findViewById(R.id.button);
		
	}
}

save方法两个参数为title和length

package com.lin.servce;

import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.Map;

public class NewsService {
//通过http把数据发到web应用里,服务器对路径长度的限制get post
	public static boolean save(String title, String length) {
 		String path="http://192.168.189.1:8080/videonews/ManageServlet";
 		Map<String,String> params=new HashMap<String,String>();
		params.put("title", title);
		params.put("length", length);
		 
//保存到map集合
		try {
			return sendGETRequest(path,params,"UTF-8");
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return false;
	}

//得到路径
private static boolean sendGETRequest(String path, Map<String, String> params, String encoding)throws Exception {
	// TODO Auto-generated method stub
	StringBuilder builder=new StringBuilder(path);
	builder.append('?');
	for(Map.Entry<String, String> entry: params.entrySet()){
		builder.append(entry.getKey()).append("=");
		builder.append(URLEncoder.encode(entry.getValue(),encoding));
		builder.append("&");//多个这个没有影响
	}
	builder.deleteCharAt(builder.length()-1);//最后一个字符的索引
	System.out.println("url"+builder);
	HttpURLConnection conn=(HttpURLConnection) new URL(builder.toString()).openConnection();
	conn.setConnectTimeout(5000);
	conn.setRequestMethod("GET");//一定要大写
	if(conn.getResponseCode()==200){
		return true;
	}
	return false;
}

 
}