服务端：
package com.sxt.day05; import java.io.IOException;
import java.util.ArrayList; import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse; import org.codehaus.jackson.map.ObjectMapper; import com.sxt.day05.entity.User; @WebServlet("/Login")
public class Login extends HttpServlet {
private static final long serialVersionUID = 1L;
ArrayList<User> users; public Login() {
super();
User user=new User("张飞", "1234", "13377889966", "zf@qq.com");
users=new ArrayList<>();
users.add(user);
user=new User("王菲", "1234", "13577889966", "wf@qq.com");
users.add(user);
user=new User("刘亦菲", "1234", "133077889966", "lyf@qq.com");
users.add(user);
user=new User("咖啡", "1234", "13877889966", "kf@qq.com");
users.add(user);
} /**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String name=request.getParameter("name");//获取客户端发过来的名字
if(name==null){
return ;
}
name=new String(name.getBytes("iso8859-1"),"utf-8");
String pwd=request.getParameter("pwd");
for(int i=0;i<users.size();i++){
User user=users.get(i);
if(name.equals(user.getName())&&pwd.equals(user.getPwd())){
ObjectMapper om=new ObjectMapper();//jackson-core-asl.jar
om.writeValue(response.getOutputStream(), user);//将user对象以输出流发送给客户端
System.out.println(user.toString());
break;
}
}
} /**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
ArrayList<User> list=new ArrayList<>();
request.setCharacterEncoding("utf-8");
String name=request.getParameter("name");
for(int i=0;i<users.size();i++){
User user=users.get(i);
if(user.getName().indexOf(name)>=0){//name在user的名字中
list.add(user);
}
}
ObjectMapper om=new ObjectMapper();
om.writeValue(response.getOutputStream(), list);
} }
客户端：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<EditText
android:id="@+id/etName"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="输入姓名"
android:text="菲"/>
<EditText
android:id="@+id/etPassword"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="输入登陆密码"
android:text="123456"
android:password="true"/> <Button
android:id="@+id/btnLogin"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="GET方式登陆" />
<Button
android:id="@+id/btnQuery"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="POST方式查询" /> </LinearLayout>
客户端Activity：
package com.sxt.day06_03; import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;
import java.util.List; import org.apache.http.client.utils.URLEncodedUtils;
import org.codehaus.jackson.map.ObjectMapper; import com.sxt.day06.entity.User; import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.EditText;
import android.widget.Toast; public class MainActivity extends Activity {
private static final String PATH="http://10.0.2.2:8080/Day06_Servlet/Login_Servlet";//服务端地址 EditText metName,metPwd; @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
setListener();
} private void setListener() {
setLoginClickListener();
setQueryClickListener();
} private void setQueryClickListener() {//查询，POST方式
findViewById(R.id.btnQuery).setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
new Thread(){//访问网络要在工作线程搞
public void run() {
String name=metName.getText().toString();
name="name="+name;
try {
byte[] data=name.getBytes("utf-8");
URL url=new URL(PATH);
HttpURLConnection conn=(HttpURLConnection) url.openConnection();
conn.setConnectTimeout(5000);
conn.setReadTimeout(5000);
conn.setRequestMethod("POST");
conn.setDoOutput(true);//像服务端发送数据
OutputStream out = conn.getOutputStream();
out.write(data);
out.flush();
if(conn.getResponseCode()!=200){
return ;
}
ObjectMapper om=new ObjectMapper();
List<User> users=om.readValue(conn.getInputStream(), List.class);
Log.i("main",users.toString());
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
};
}.start();
}
});
} private void setLoginClickListener() {
findViewById(R.id.btnLogin).setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
new Thread(){//访问网络要在工作线程搞
public void run() {
String name=metName.getText().toString();
String password=metPwd.getText().toString();
StringBuilder sb=new StringBuilder(PATH);//PATH地址
try {
sb.append("?name=").append(URLEncoder.encode(name, "utf-8"))
.append("&password=").append(password);
URL url=new URL(sb.toString());//
HttpURLConnection conn=(HttpURLConnection)url.openConnection();
conn.setReadTimeout(5000);//读取权限5秒，否则断开
conn.setConnectTimeout(5000);//连接时间5秒，否则断开
conn.setRequestMethod("GET");//
if(conn.getResponseCode()!=200){
Toast.makeText(MainActivity.this, "连接服务端失败", 2000).show();
return ;
}
ObjectMapper om=new ObjectMapper();
User user = om.readValue(conn.getInputStream(), User.class);
Log.i("main",user.toString());
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
};
}.start();
}
});
} private void initView() {
metName=(EditText) findViewById(R.id.etName);
metPwd=(EditText) findViewById(R.id.etPassword);
} }
客户端项目描述文件：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.sxt.day06_03"
android:versionCode="1"
android:versionName="1.0" > <uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="18" />
<uses-permission android:name="android.permission.INTERNET"/> 安卓想访问网络要申请网络权限
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.sxt.day06_03.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>
</application> </manifest>