本文概述
- Android Restful Web服务教程
- 什么是Web服务？
- Android Restful Web服务示例
- 使用oracle数据库的Java Servlet登录和注册示例
Android Restful Web服务教程在开发Web服务应用程序之前，你必须具有SOAP和Restful Web服务的基本知识。因此，我们将讨论有关Web服务的基本要点，例如什么是Web服务以及有关SOAP和Restful Web服务的简要信息。
什么是Web服务？Web服务是用于在不同类型的应用程序之间交换信息的标准，而与语言和平台无关。例如，Android应用程序可以使用Web服务与Java或.net应用程序进行交互。
Android Restful Web服务示例
<
RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" ><
EditText
android:id="@+id/editText1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:hint="Username"
android:ems="10" ><
requestFocus />
<
/EditText><
EditText
android:id="@+id/editText2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/editText1"
android:layout_below="@+id/editText1"
android:layout_marginTop="67dp"
android:ems="10"
android:hint="Password"
android:inputType="textPassword" /><
Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_marginBottom="24dp"
android:layout_toRightOf="@+id/button1"
android:text="New User" /><
ProgressBar
android:id="@+id/progressBar1"
style="?android:attr/progressBarStyleLarge"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/button1"
android:layout_below="@+id/editText2"
android:layout_marginTop="22dp" /><
Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/editText2"
android:layout_below="@+id/progressBar1"
android:layout_marginLeft="22dp"
android:text="Login" /><
/RelativeLayout>文件：activity_register_user.xml
<
RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" ><
EditText
android:id="@+id/editText1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="15dp"
android:ems="10"
android:hint="Enter UserName" /><
EditText
android:id="@+id/editText2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/editText1"
android:layout_below="@+id/editText1"
android:layout_marginTop="50dp"
android:ems="10"
android:hint="Enter Password"
android:inputType="textPassword" /><
Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:text="Resister" /><
ProgressBar
android:id="@+id/progressBar1"
style="?android:attr/progressBarStyleLarge"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/button1"
android:layout_below="@+id/editText2"
android:layout_marginTop="87dp" /><
/RelativeLayout>MainActivity类
package com.example.newrestapi;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
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.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import android.os.AsyncTask;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ProgressBar;
import android.widget.Toast;
public class MainActivity extends Activity {
EditText password, userName;
Button login, resister;
ProgressBar progressBar;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
password=(EditText) findViewById(R.id.editText2);
userName=(EditText) findViewById(R.id.editText1);
login=(Button) findViewById(R.id.button1);
resister=(Button) findViewById(R.id.button2);
//progess_msz.setVisibility(View.GONE);
progressBar=(ProgressBar) findViewById(R.id.progressBar1);
progressBar.setVisibility(View.GONE);
resister.setOnClickListener(new OnClickListener() {@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
Intentintent=new Intent(MainActivity.this, ResisterUser.class);
startActivity(intent);
}
});
login.setOnClickListener(new OnClickListener() {public void onClick(View v) {
progressBar.setVisibility(View.VISIBLE);
String s1=userName.getText().toString();
String s2=password.getText().toString();
new ExecuteTask().execute(s1, s2);
}
});
}
class ExecuteTask extends AsyncTask<
String, Integer, String>
{@Override
protected String doInBackground(String... params) {String res=PostData(params);
return res;
}@Override
protected void onPostExecute(String result) {
progressBar.setVisibility(View.GONE);
//progess_msz.setVisibility(View.GONE);
Toast.makeText(getApplicationContext(), result, 3000).show();
}}
public String PostData(String[] valuse) {
String s="";
try
{
HttpClient httpClient=new DefaultHttpClient();
HttpPost httpPost=new HttpPost("http://10.0.0.8:7777/HttpPostServlet/servlet/Login");
List<
NameValuePair> list=new ArrayList<
NameValuePair>();
list.add(new BasicNameValuePair("name", valuse[0]));
list.add(new BasicNameValuePair("pass", valuse[1]));
httpPost.setEntity(new UrlEncodedFormEntity(list));
HttpResponse httpResponse= httpClient.execute(httpPost);
HttpEntity httpEntity=httpResponse.getEntity();
s= readResponse(httpResponse);
}
catch(Exception exception){}
return s;
}
public String readResponse(HttpResponse res) {
InputStream is=null;
String return_text="";
try {
is=res.getEntity().getContent();
BufferedReader bufferedReader=new BufferedReader(new InputStreamReader(is));
String line="";
StringBuffer sb=new StringBuffer();
while ((line=bufferedReader.readLine())!=null)
{
sb.append(line);
}
return_text=sb.toString();
} catch (Exception e)
{}
return return_text;
}
}RegisterUser类
package com.example.newrestapi;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import android.os.AsyncTask;
import android.os.Bundle;
import android.app.Activity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ProgressBar;
public class ResisterUser extends Activity {
EditText userName, passwprd;
Button resister, login;
ProgressBar progressBar;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_resister_user);
userName=(EditText) findViewById(R.id.editText1);
;
passwprd=(EditText) findViewById(R.id.editText2);
resister=(Button) findViewById(R.id.button1);
progressBar=(ProgressBar) findViewById(R.id.progressBar1);
progressBar.setVisibility(View.GONE);
resister.setOnClickListener(new OnClickListener() {@Override
public void onClick(View v) {progressBar.setVisibility(View.VISIBLE);
String s1=userName.getText().toString();
String s2=passwprd.getText().toString();
new ExecuteTask().execute(s1, s2);
}
});
}class ExecuteTask extends AsyncTask<
String, Integer, String>
{@Override
protected String doInBackground(String... params) {PostData(params);
return null;
}@Override
protected void onPostExecute(String result) {
progressBar.setVisibility(View.GONE);
}}public void PostData(String[] valuse) {
try
{
HttpClient httpClient=new DefaultHttpClient();
HttpPost httpPost=new HttpPost(
"http://10.0.0.8:7777/HttpPostServlet/servlet/httpPostServlet");
List<
NameValuePair> list=new ArrayList<
NameValuePair>();
list.add(new BasicNameValuePair("name", valuse[0]));
list.add(new BasicNameValuePair("pass", valuse[1]));
httpPost.setEntity(new UrlEncodedFormEntity(list));
httpClient.execute(httpPost);
}
catch(Exception e)
{
System.out.println(e);
}}}你需要在AndroidManifest.xml文件中提供INTERNET权限。
<
?xml version="1.0" encoding="utf-8"?>
<
manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.newrestapi"
android:versionCode="1"
android:versionName="1.0" ><
uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" /><
uses-permission android:name="android.permission.INTERNET" /><
application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<
activity
android:name="com.example.newrestapi.MainActivity"
android:label="@string/app_name" >
<
intent-filter>
<
action android:name="android.intent.action.MAIN" /><
category android:name="android.intent.category.LAUNCHER" />
<
/intent-filter>
<
/activity>
<
activity
android:name="com.example.newrestapi.ResisterUser"
android:label="@string/title_activity_resister_user" >
<
/activity>
<
/application><
/manifest>输出：
文章图片
文章图片
使用oracle数据库的Java Servlet登录和注册示例在oracle数据库中创建具有三列id，name和password的表srcmini_user。 ID必须是主键，并且是通过SEQUENCE生成的。
CREATE TABLE"srcmini_USER"
( "ID" NUMBER, "NAME" VARCHAR2(4000), "PASSWORD" VARCHAR2(4000), CONSTRAINT "srcmini_USER_PK" PRIMARY KEY ("ID") ENABLE
)
/【android的web服务】新创建两个servlet类来登录和注册用户。
登录Servlet类
package server;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class Login extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
ObjectOutputStream out=new ObjectOutputStream(response.getOutputStream());
String n=request.getParameter("name");
String p=request.getParameter("pass");
System.out.println(n);
System.out.println(p);
if(validate(n, p)){
out.writeObject("success");
}
else{
out.writeObject("Sorry username or password error");
}out.close();
}
public static boolean validate(String name, String pass){
boolean status=false;
try{
Class.forName("oracle.jdbc.driver.OracleDriver");
Connection con=DriverManager.getConnection(
"jdbc:oracle:thin:@localhost:1521:xe", "system", "oracle");
PreparedStatement ps=con.prepareStatement(
"select * from srcmini_user where name=? and password=?");
ps.setString(1, name);
ps.setString(2, pass);
ResultSet rs=ps.executeQuery();
status=rs.next();
}catch(Exception e){System.out.println(e);
}
return status;
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
}httpPostServlet Servlet类
package server;
import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class httpPostServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
String recived_data="";
String s1=request.getParameter("name");
String s2=request.getParameter("pass");
System.out.println(s1);
System.out.println(s2);
try
{
Class.forName("oracle.jdbc.driver.OracleDriver");
Connection con=DriverManager.getConnection(
"jdbc:oracle:thin:@localhost:1521:xe", "system", "oracle");
PreparedStatement ps=con.prepareStatement(
"insert into srcmini_user(name, password) values(?, ?)");
ps.setString(1, s1);
ps.setString(2, s2);
ps.executeUpdate();
con.close();
}
catch (Exception e) {
e.printStackTrace();
}}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}}index.jsp
<
form action="servlet/Login">
Name:<
input type="text" name="name"/><
br/>
Password:<
input type="password" name="pass"/><
br/>
<
input type="submit" value="http://www.srcmini.com/login"/>
<
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