Android开发使用POST方式向服务器请求和发送数据
浏览数：22 /
时间：2015年06月11日
前面说了GET方式。现在尝试一下POST
#1.首先先用新建个servlet处理登陆请求
package com.wzw.servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class LoginServlet
*/
public class LoginServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public LoginServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String username=request.getParameter("username");
String password=request.getParameter("password");
if(username.equals("admin")&&password.equals("123456")){
response.getWriter().println("success");
}else{
response.getWriter().println("failed");
}
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub<span style="white-space:pre"> </span>this.doGet(request,response); } }
#2.布局文件也很简单
<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"
tools:context=".MainActivity" >
<EditText
android:layout_marginTop="10dp"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/et_username"
android:hint="请输入名字"/>
<EditText
android:layout_marginTop="10dp"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/et_password"
android:hint="请输入密码"/>
<Button android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:onClick="doGet"
android:text="GET方式提交"/>
<Button android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:onClick="doPost"
android:text="POST方式提交"/>
</LinearLayout>
#3在mainactivity中实现方法
package com.wzw.submitdata;
import com.wzw.submitdata.utils.NetUtil;
import android.os.Bundle;
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 {
private EditText etUsername;
private EditText etPassword;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
etUsername = (EditText) findViewById(R.id.et_username);
etPassword = (EditText) findViewById(R.id.et_password);
}
public void doGet(View v){
final String username=etUsername.getText().toString();
final String password=etPassword.getText().toString();
new Thread(new Runnable() {
@Override
public void run() {
//访问网络要在子线程中实现，使用get取数据
final String state=NetUtil.loginOfGet(username, password);
//执行在主线程上
runOnUiThread(new Runnable() {
public void run() {
//就是在主线程上操作,弹出结果
Toast.makeText(MainActivity.this, state, 0).show();
}
});
}
}).start();
}
public void doPost(View v){
final String username=etUsername.getText().toString();
final String password=etPassword.getText().toString();
new Thread(new Runnable() {
@Override
public void run() {
final String state=NetUtil.LoginOfPost(username, password);
//执行在主线程上
runOnUiThread(new Runnable() {
public void run() {
//就是在主线程上操作,弹出结果
Toast.makeText(MainActivity.this, state, 0).show();
}
});
}
}).start();
}
}
#4.具体处理GET和POST的方法
package com.wzw.submitdata.utils;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
public class NetUtil {
/**
* 使用GET访问去访问网络
* @param username
* @param password
* @return 服务器返回的结果
*/
public static String loginOfGet(String username,String password){
HttpURLConnection conn=null;
try {
String data="username="+username+"&password="+password;
URL url=new URL("http://192.168.1.4:8080/AndroidServer/LoginServlet?"+data);
conn=(HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setConnectTimeout(10000);
conn.setReadTimeout(5000);
conn.connect();
int code=conn.getResponseCode();
if(code==200){
InputStream is=conn.getInputStream();
String state=getStringFromInputStream(is);
return state;
}
} catch (Exception e) {
e.printStackTrace();
}finally{
if(conn!=null){
conn.disconnect();
}
}
return null;
}
/**
* 使用POST访问去访问网络
* @param username
* @param password
* @return
*/
public static String LoginOfPost(String username,String password){
HttpURLConnection conn=null;
try {
URL url=new URL("http://192.168.1.4:8080/AndroidServer/LoginServlet");
conn=(HttpURLConnection) url.openConnection();
conn.setRequestMethod("POST");
conn.setConnectTimeout(10000);
conn.setReadTimeout(5000);
conn.setDoOutput(true);
//post请求的参数
String data="username="+username+"&password="+password;
OutputStream out=conn.getOutputStream();
out.write(data.getBytes());
out.flush();
out.close();
conn.connect();
int code=conn.getResponseCode();
if(code==200){
InputStream is=conn.getInputStream();
String state=getStringFromInputStream(is);
return state;
}
} catch (Exception e) {
e.printStackTrace();
}finally{
if(conn!=null){
conn.disconnect();
}
}
return null;
}
/**
* 根据输入流返回一个字符串
* @param is
* @return
* @throws Exception
*/
private static String getStringFromInputStream(InputStream is) throws Exception{
ByteArrayOutputStream baos=new ByteArrayOutputStream();
byte[] buff=new byte[1024];
int len=-1;
while((len=is.read(buff))!=-1){
baos.write(buff, 0, len);
}
is.close();
String html=baos.toString();
baos.close();
return html;
}
}
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