Android Tomcat 的应用之客户端部分
Android Tomcat 的应用之客户端部分
最近因为做一个客户端的登录部分，最后选择了使用Tomcat作为servlet服务器，MySQL作为数据库，今天就先写了一下客户端的部分，主要就是Android的网络编程部分，服务器端编程明天再写吧，今天有点累了。
首先是布局文件，如下：
[html] <?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/hello" />
<TableLayout >
<TableRow >
<TextView
android:id="@+id/tv_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/nameStr"/>
<EditText
android:id="@+id/et_name"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
</TableRow>
<TableRow >
<TextView
android:id="@+id/tv_passwd"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/passwdStr"/>
<EditText
android:id="@+id/et_passwd"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:password="true"/>
</TableRow>
<TableRow >
<Button
android:id="@+id/btn_confirm"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/btn_confirm"/>
<Button
android:id="@+id/btn_cancel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/btn_cancel"/>
</TableRow>
</TableLayout>
</LinearLayout>
<?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/hello" />
<TableLayout >
<TableRow >
<TextView
android:id="@+id/tv_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/nameStr"/>
<EditText
android:id="@+id/et_name"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
</TableRow>
<TableRow >
<TextView
android:id="@+id/tv_passwd"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/passwdStr"/>
<EditText
android:id="@+id/et_passwd"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:password="true"/>
</TableRow>
<TableRow >
<Button
android:id="@+id/btn_confirm"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/btn_confirm"/>
<Button
android:id="@+id/btn_cancel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/btn_cancel"/>
</TableRow>
</TableLayout>
</LinearLayout> 然后就是进行网络编程部分了，肯定是要用到post方式，这个部分就做一个单独的工具类，大家看一下就明白：
[java] package com.chenlong12580.app.tomcat;
import java.io.IOException;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
public class HttpUtil {
// 基础URL
public static final String BASE_URL="http://222.20.60.132:8080/WebRoot/";
// 获得Get请求对象request
public static HttpGet getHttpGet(String url){
HttpGet request = new HttpGet(url);
return request;
}
// 获得Post请求对象request
public static HttpPost getHttpPost(String url){
HttpPost request = new HttpPost(url);
return request;
}
// 根据请求获得响应对象response
public static HttpResponse getHttpResponse(HttpGet request) throws ClientProtocolException, IOException{
HttpResponse response = new DefaultHttpClient().execute(request);
return response;
}
// 根据请求获得响应对象response
public static HttpResponse getHttpResponse(HttpPost request) throws ClientProtocolException, IOException{
HttpResponse response = new DefaultHttpClient().execute(request);
return response;
}
// 发送Post请求，获得响应查询结果
public static String queryStringForPost(String url){
// 根据url获得HttpPost对象
HttpPost request = HttpUtil.getHttpPost(url);
String result = null;
try {
// 获得响应对象
HttpResponse response = HttpUtil.getHttpResponse(request);
// 判断是否请求成功
if(response.getStatusLine().getStatusCode()==200){
// 获得响应
result = EntityUtils.toString(response.getEntity());
return result;
}
} catch (ClientProtocolException e) {
e.printStackTrace();
result = "网络异常！";
return result;
} catch (IOException e) {
e.printStackTrace();
result = "网络异常！";
return result;
}
return null;
}
// 获得响应查询结果
public static String queryStringForPost(HttpPost request){
String result = null;
try {
// 获得响应对象
HttpResponse response = HttpUtil.getHttpResponse(request);
// 判断是否请求成功
if(response.getStatusLine().getStatusCode()==200){
// 获得响应
result = EntityUtils.toString(response.getEntity());
return result;
}
} catch (ClientProtocolException e) {
e.printStackTrace();
result = "网络异常！";
return result;
} catch (IOException e) {
e.printStackTrace();
result = "网络异常！";
return result;
}
return null;
}
// 发送Get请求，获得响应查询结果
public static String queryStringForGet(String url){
// 获得HttpGet对象
HttpGet request = HttpUtil.getHttpGet(url);
String result = null;
try {
// 获得响应对象
HttpResponse response = HttpUtil.getHttpResponse(request);
// 判断是否请求成功
if(response.getStatusLine().getStatusCode()==200){
// 获得响应
result = EntityUtils.toString(response.getEntity());
return result;
}
} catch (ClientProtocolException e) {
e.printStackTrace();
result = "网络异常！";
return result;
} catch (IOException e) {
e.printStackTrace();
result = "网络异常！";
return result;
}
return null;
}
}
package com.chenlong12580.app.tomcat;
import java.io.IOException;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
public class HttpUtil {
// 基础URL
public static final String BASE_URL="http://222.20.60.132:8080/WebRoot/";
// 获得Get请求对象request
public static HttpGet getHttpGet(String url){
HttpGet request = new HttpGet(url);
return request;
}
// 获得Post请求对象request
public static HttpPost getHttpPost(String url){
HttpPost request = new HttpPost(url);
return request;
}
// 根据请求获得响应对象response
public static HttpResponse getHttpResponse(HttpGet request) throws ClientProtocolException, IOException{
HttpResponse response = new DefaultHttpClient().execute(request);
return response;
}
// 根据请求获得响应对象response
public static HttpResponse getHttpResponse(HttpPost request) throws ClientProtocolException, IOException{
HttpResponse response = new DefaultHttpClient().execute(request);
return response;
}
// 发送Post请求，获得响应查询结果
public static String queryStringForPost(String url){
// 根据url获得HttpPost对象
HttpPost request = HttpUtil.getHttpPost(url);
String result = null;
try {
// 获得响应对象
HttpResponse response = HttpUtil.getHttpResponse(request);
// 判断是否请求成功
if(response.getStatusLine().getStatusCode()==200){
// 获得响应
result = EntityUtils.toString(response.getEntity());
return result;
}
} catch (ClientProtocolException e) {
e.printStackTrace();
result = "网络异常！";
return result;
} catch (IOException e) {
e.printStackTrace();
result = "网络异常！";
return result;
}
return null;
}
// 获得响应查询结果
public static String queryStringForPost(HttpPost request){
String result = null;
try {
// 获得响应对象
HttpResponse response = HttpUtil.getHttpResponse(request);
// 判断是否请求成功
if(response.getStatusLine().getStatusCode()==200){
// 获得响应
result = EntityUtils.toString(response.getEntity());
return result;
}
} catch (ClientProtocolException e) {
e.printStackTrace();
result = "网络异常！";
return result;
} catch (IOException e) {
e.printStackTrace();
result = "网络异常！";
return result;
}
return null;
}
// 发送Get请求，获得响应查询结果
public static String queryStringForGet(String url){
// 获得HttpGet对象
HttpGet request = HttpUtil.getHttpGet(url);
String result = null;
try {
// 获得响应对象
HttpResponse response = HttpUtil.getHttpResponse(request);
// 判断是否请求成功
if(response.getStatusLine().getStatusCode()==200){
// 获得响应
result = EntityUtils.toString(response.getEntity());
return result;
}
} catch (ClientProtocolException e) {
e.printStackTrace();
result = "网络异常！";
return result;
} catch (IOException e) {
e.printStackTrace();
result = "网络异常！";
return result;
}
return null;
}
} 最后就是在Activity里面实现功能了，也就是设置按钮的事件监听器，如下：
[java] package com.chenlong12580.app.tomcat;
import android.app.Activity;
import android.app.AlertDialog;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class TomcatActivity extends Activity {
/** Called when the activity is first created. */
private EditText et_name, et_passwd;
private Button btn_confirm, btn_cancel;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
et_name = (EditText)findViewById(R.id.et_name);
et_passwd = (EditText)findViewById(R.id.et_passwd);
btn_confirm = (Button)findViewById(R.id.btn_confirm);
btn_cancel = (Button)findViewById(R.id.btn_cancel);
btn_cancel.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
finish();
}
});
btn_confirm.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
String queryStr = "username=" + et_name.getText().toString()
+"&password=" + et_passwd.getText().toString();
String urlStr = HttpUtil.BASE_URL+"servlet/tomcat?"+queryStr;
String result = HttpUtil.queryStringForPost(urlStr);
if(result != null) {
showDialog("登录成功！");
}else {
showDialog("登录失败！");
}
}
});
}
private void showDialog(String str) {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage(str).setPositiveButton("确定", null);
AlertDialog dialog = builder.create();
dialog.show();
}
}
package com.chenlong12580.app.tomcat;
import android.app.Activity;
import android.app.AlertDialog;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class TomcatActivity extends Activity {
/** Called when the activity is first created. */
private EditText et_name, et_passwd;
private Button btn_confirm, btn_cancel;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
et_name = (EditText)findViewById(R.id.et_name);
et_passwd = (EditText)findViewById(R.id.et_passwd);
btn_confirm = (Button)findViewById(R.id.btn_confirm);
btn_cancel = (Button)findViewById(R.id.btn_cancel);
btn_cancel.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
finish();
}
});
btn_confirm.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
String queryStr = "username=" + et_name.getText().toString()
+"&password=" + et_passwd.getText().toString();
String urlStr = HttpUtil.BASE_URL+"servlet/tomcat?"+queryStr;
String result = HttpUtil.queryStringForPost(urlStr);
if(result != null) {
showDialog("登录成功！");
}else {
showDialog("登录失败！");
}
}
});
}
private void showDialog(String str) {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage(str).setPositiveButton("确定", null);
AlertDialog dialog = builder.create();
dialog.show();
}
} 现在还不能测试，等明天写好服务器端再测试吧！
摘自 chenlong12580的专栏
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