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java - 如何使用 httpPost 将数据发送到网站,应用程序崩溃

转载 作者:可可西里 更新时间:2023-11-01 16:56:25 25 4
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目前我正在做一个项目。我需要将一些数据从我的 android 应用程序发送到网络服务器。但是当我触摸发送按钮时,应用程序崩溃了。

这是我的 .java 文件

package com.androidexample.httppostexample;
import java.io.IOException;
import org.apache.http.client.ClientProtocolException;

import java.util.ArrayList;
import java.util.List;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;

import org.apache.http.NameValuePair;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.message.BasicNameValuePair;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;


public class HttpPostExample extends Activity {

Button sendButton;

EditText msgTextField;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
// load the layout
setContentView(R.layout.activity_http_post_example);

// make message text field object
msgTextField = (EditText) findViewById(R.id.msgTextField);
// make send button object
sendButton = (Button) findViewById(R.id.sendButton);

}

// this is the function that gets called when you click the button
public void send(View v)
{
// get the message from the message text box
String msg = msgTextField.getText().toString();

// make sure the fields are not empty
if (msg.length()>0)
{
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://www.eeecoderpages.orgfree.com/post.php");
try {
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
nameValuePairs.add(new BasicNameValuePair("id", "12345"));
nameValuePairs.add(new BasicNameValuePair("message", msg));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
httpclient.execute(httppost);
msgTextField.setText(""); // clear text box
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
} catch (IOException e) {
// TODO Auto-generated catch block
}

}
else
{
// display message if text fields are empty
Toast.makeText(getBaseContext(),"All field are required",Toast.LENGTH_SHORT).show();
}

}

}

这是我的 xml gui 文件:

<?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"
>
<TextView
android:text="Message"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>

<EditText
android:id="@+id/msgTextField"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<Button
android:text="Send"
android:id="@+id/sendButton"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:onClick="send"
/>

</LinearLayout>

我还在 list 中添加了互联网权限:

<uses-permission android:name="android.permission.INTERNET"></uses-permission>

在网络服务器端,我使用了以下php脚本:

<?php

// get the "message" variable from the post request
// this is the data coming from the Android app
$message=$_POST["message"];

// specify the file where we will save the contents of the variable message
$filename="androidmessages.html";

// write (append) the data to the file
file_put_contents($filename,$message."<br />",FILE_APPEND);

// load the contents of the file to a variable
$androidmessages=file_get_contents($filename);

// display the contents of the variable (which has the contents of the file)
echo $androidmessages;


?>

但它不起作用。 当我触摸发送按钮时,系统关闭了我的应用程序。我搜索了很多解决方案,但没有一个适合我。任何机构的任何帮助我将不胜感激!

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