android 客户端与服务端的通信 发送get和post请求并获取数据

android 客户端与服务端的通信 

发送get和post请求并获取数据 在客户端发送请求，服务端得到响应，看效果图：

客户端：





服务端：



客户端代码：

get post 工具类：

package com.jiaruihuademo.inetsendmsg;

import java.io.*; 

import java.net.*;

import java.util.*;

/**

 * @author  jiaruihua jrhhybh@163.com

 * @version  1.0

 */

public class GetPostUtil

{
/**
* 向指定URL发送GET方法的请求
* @param url 发送请求的URL
* @param params 请求参数，请求参数应该是name1=value1&name2=value2的形式。
* @return URL所代表远程资源的响应
*/
public static String sendGet(String url, String params)
{
String result = "";
BufferedReader in = null;
try
{
String urlName = url + "?" + params;
URL realUrl = new URL(urlName);
// 打开和URL之间的连接
URLConnection conn = realUrl.openConnection();
// 设置通用的请求属性
conn.setRequestProperty("accept", "*/*");
conn.setRequestProperty("connection", "Keep-Alive");
conn.setRequestProperty("user-agent",
"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)");
// 建立实际的连接
conn.connect();  //①
// 获取所有响应头字段
Map<String, List<String>> map = conn.getHeaderFields();
// 遍历所有的响应头字段
for (String key : map.keySet())
{
System.out.println(key + "--->" + map.get(key));
}
// 定义BufferedReader输入流来读取URL的响应
in = new BufferedReader(
new InputStreamReader(conn.getInputStream()));
String line;
while ((line = in.readLine()) != null)
{
result += "\n" + line;
}
}
catch (Exception e)
{
System.out.println("发送GET请求出现异常！" + e);
e.printStackTrace();
}
// 使用finally块来关闭输入流
finally
{
try
{
if (in != null)
{
in.close();
}
}
catch (IOException ex)
{
ex.printStackTrace();
}
}
return result;
}

/**
* 向指定URL发送POST方法的请求
* @param url 发送请求的URL
* @param params 请求参数，请求参数应该是name1=value1&name2=value2的形式。
* @return URL所代表远程资源的响应
*/
public static String sendPost(String url, String params)
{
PrintWriter out = null;
BufferedReader in = null;
String result = "";
try
{
URL realUrl = new URL(url);
// 打开和URL之间的连接
URLConnection conn = realUrl.openConnection();
// 设置通用的请求属性
conn.setRequestProperty("accept", "*/*");
conn.setRequestProperty("connection", "Keep-Alive");
conn.setRequestProperty("user-agent",
"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)");
// 发送POST请求必须设置如下两行
conn.setDoOutput(true);
conn.setDoInput(true);
// 获取URLConnection对象对应的输出流
out = new PrintWriter(conn.getOutputStream());
// 发送请求参数
out.print(params);  //②
// flush输出流的缓冲
out.flush();
// 定义BufferedReader输入流来读取URL的响应
in = new BufferedReader(
new InputStreamReader(conn.getInputStream()));
String line;
while ((line = in.readLine()) != null)
{
result += "\n" + line;
}
}
catch (Exception e)
{
System.out.println("发送POST请求出现异常！" + e);
e.printStackTrace();
}
// 使用finally块来关闭输出流、输入流
finally
{
try
{
if (out != null)
{
out.close();
}
if (in != null)
{
in.close();
}
}
catch (IOException ex)
{
ex.printStackTrace();
}
}
return result;
}

}

主类：

package com.jiaruihuademo.inetsendmsg;

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;

/**

 * @author  jiaruihua jrhhybh@163.com

 * @version  1.0

 */

public class MainActivity extends Activity

{
Button get , post;
TextView show;
private String TOURL = "http://192.168.56.1:8080/InetGetMsg/servlet/GetPostTestDemo";
// 代表服务器响应的字符串
String response;
Handler handler = new Handler()
{
@Override
public void handleMessage(Message msg)
{
if(msg.what == 0x123)
{
// 设置show组件显示服务器响应
show.setText(response);
}
}
};
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
get = (Button) findViewById(R.id.get);
post = (Button) findViewById(R.id.post);
show = (TextView)findViewById(R.id.show);
get.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View v)
{
new Thread()
{
@Override
public void run()
{
response = GetPostUtil.sendGet(
TOURL
, "str=get");
// 发送消息通知UI线程更新UI组件
handler.sendEmptyMessage(0x123);
}
}.start();
}
});
post.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View v)
{
new Thread()
{
@Override
public void run()
{
response = GetPostUtil.sendPost(
TOURL
, "str=post");
}
}.start();
// 发送消息通知UI线程更新UI组件
handler.sendEmptyMessage(0x123);
}
});
}

}

XML:

<?xml version="1.0" encoding="utf-8"?>

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

<LinearLayout
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
>

<Button
android:id="@+id/get"  
android:layout_width="wrap_content" 
android:layout_height="wrap_content" 
android:text="发送get请求"
/>

<Button
android:id="@+id/post"  
android:layout_width="wrap_content" 
android:layout_height="wrap_content" 
android:text="发送post请求"
/>

</LinearLayout>

<TextView  
android:id="@+id/show"
android:layout_width="fill_parent" 
android:layout_height="fill_parent" 
android:gravity="top"
android:background="#ffff"
android:textColor="#f000"
android:textSize="16dp"
/>

</LinearLayout>

服务端：

package com.jiaruihuademo.internet;

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class GetPostTestDemo extends HttpServlet {

/**
* Constructor of the object.
*/
public GetPostTestDemo() {
super();
}

/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

response.setContentType("text/html;charset=utf-8");// 乱码-->中文格式化
doPost(request, response);

}

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

response.setContentType("text/html;charset=utf-8");// 乱码-->中文格式化
PrintWriter out = response.getWriter();

String result = request.getParameter("str");
if (result.equals("get")) {
out.write("接受get成功！");
System.out.println("接受get成功！");
}
if (result.equals("post")) {
out.write("接受post成功！");
System.out.println("接受post成功！");
}

out.flush();
out.close();
}

/**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occurs
*/
public void init() throws ServletException {
// Put your code here
}

}

源码下载