Java 如何使用httpPost向网站发送数据,应用程序崩溃
目前我正在做一个项目。我需要从android应用程序向Web服务器发送一些数据。但当我按下发送按钮时,应用程序崩溃了 这是我的.java文件Java 如何使用httpPost向网站发送数据,应用程序崩溃,java,php,android,http,http-post,Java,Php,Android,Http,Http Post,目前我正在做一个项目。我需要从android应用程序向Web服务器发送一些数据。但当我按下发送按钮时,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;
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();
}
}
}
package com.androidexample.httppostexample;
导入java.io.IOException;
导入org.apache.http.client.ClientProtocolException;
导入java.util.ArrayList;
导入java.util.List;
导入org.apache.http.client.HttpClient;
导入org.apache.http.client.methods.HttpPost;
导入org.apache.http.impl.client.DefaultHttpClient;
导入org.apache.http.NameValuePair;
导入org.apache.http.client.entity.UrlEncodedFormEntity;
导入org.apache.http.message.BasicNameValuePair;
导入android.app.Activity;
导入android.os.Bundle;
导入android.view.view;
导入android.widget.Button;
导入android.widget.EditText;
导入android.widget.Toast;
公共类HttpPostExample扩展活动{
按钮发送按钮;
编辑文本msgTextField;
/**在首次创建活动时调用*/
@凌驾
创建时的公共void(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
//加载布局
setContentView(R.layout.activity\u http\u post\u示例);
//使消息文本字段成为对象
msgTextField=(EditText)findViewById(R.id.msgTextField);
//生成发送按钮对象
sendButton=(按钮)findViewById(R.id.sendButton);
}
//这是单击按钮时调用的函数
公共无效发送(视图五)
{
//从消息文本框中获取消息
字符串msg=msgTextField.getText().toString();
//确保字段不是空的
如果(msg.length()>0)
{
HttpClient HttpClient=新的DefaultHttpClient();
HttpPost HttpPost=新的HttpPost(“http://www.eeecoderpages.orgfree.com/post.php");
试一试{
List nameValuePairs=新的ArrayList(2);
添加(新的BasicNameValuePair(“id”,“12345”);
添加(新的BasicNameValuePair(“消息”,msg));
setEntity(新的UrlEncodedFormEntity(nameValuePairs));
httpclient.execute(httppost);
msgTextField.setText(“”;//清除文本框
}捕获(客户端协议例外e){
//TODO自动生成的捕捉块
}捕获(IOE异常){
//TODO自动生成的捕捉块
}
}
其他的
{
//如果文本字段为空,则显示消息
Toast.makeText(getBaseContext(),“所有字段都是必需的”,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>
我还将internet权限添加到清单中:
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
在Web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;
?>
但它不起作用当我按下发送按钮时,系统关闭了我的应用。我搜索了很多解决方案,但没有一个适合我。任何人的帮助我都会感激的 听起来您好像遇到了
NetworkOnMainThread
异常
原因:您正在主UI线程上执行网络操作
解决方案:使用
AsyncTask
听起来您好像遇到了networkMainThread
异常
原因:您正在主UI线程上执行网络操作
解决方案:使用
AsyncTask
您正在主ui线程上执行与网络相关的操作。使用线程
或异步任务
您将获得networkonmainthreadeception
post蜂巢
new PostTask().execute();
异步任务
class PostTask extends AsyncTask<Void,Void,Void>
{
@Override
protected void doInbackground(Void... params)
{
// network related operation
// do not update ui here
// your http post here
}
}
使用
onPreExecute
和onPostExecute
进行ui更新。您正在主ui线程上执行与网络相关的操作。使用线程
或异步任务
您将获得networkonmainthreadeception
post蜂巢
new PostTask().execute();
异步任务
class PostTask extends AsyncTask<Void,Void,Void>
{
@Override
protected void doInbackground(Void... params)
{
// network related operation
// do not update ui here
// your http post here
}
}
使用
onPreExecute
和onPostExecute
进行ui更新。不允许在ui主线程上进行网络操作
试试下面的代码
public class NetRequestAsync extends AsyncTask<Void, Void, Boolean> {
String id, msg;
public NetRequestAsync(String id, String message) {
this.id = id;
this.msg = message;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected Boolean doInBackground(Void... params) {
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", id));
nameValuePairs.add(new BasicNameValuePair("message", msg));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
httpclient.execute(httppost);
return true;
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return false;
}
@Override
protected void onPostExecute(Boolean result) {
super.onPostExecute(result);
if(result){
//successful request
}else{
//error in request response
}
msgTextField.setText(""); // clear text box
}
}
注意
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();
}
}
}
doInBackground()
方法中不允许更新TextView、EditText或将图像设置为ImageView等UI操作。您可以在onPostExecute()
或onPreExecute()
中执行此操作,但不允许在UI主线程上执行网络操作
试试下面的代码
public class NetRequestAsync extends AsyncTask<Void, Void, Boolean> {
String id, msg;
public NetRequestAsync(String id, String message) {
this.id = id;
this.msg = message;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected Boolean doInBackground(Void... params) {
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", id));
nameValuePairs.add(new BasicNameValuePair("message", msg));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
httpclient.execute(httppost);
return true;
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return false;
}
@Override
protected void onPostExecute(Boolean result) {
super.onPostExecute(result);
if(result){
//successful request
}else{
//error in request response
}
msgTextField.setText(""); // clear text box
}
}
注意
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();
}
}
}
doInBackground()
方法中不允许更新TextView、EditText或将图像设置为ImageView等UI操作。您可以在onPostExecute()
或onPreExecute()
日志猫说什么NetworkOnMainThreadexception
?伙计们,谢谢你们的回答!。但它仍然不起作用。。发送按钮现在是好的。当我再按按钮时,应用程序不会崩溃。但是在我的php网站上没有我发送的任何数据。请帮忙。为什么它不起作用?我不明白。我还向html文件添加了读写权限。它仍然没有收到我从android发送的新数据。。另外,当我打开应用程序并按下按钮发送数据时,错误日志中没有任何错误。日志猫怎么说NetworkOnMainThreadexception
?伙计们,谢谢你们的回答!。但它仍然不起作用。。发送按钮现在是好的。当我再按按钮时,应用程序不会崩溃。但是在我的php网站上没有我发送的任何数据。请帮忙。为什么它不起作用?我不明白。我还向html文件添加了读写权限。它仍然没有收到我从android发送的新数据。。此外,当我打开应用程序并按下按钮发送数据时,错误日志中没有任何错误。请阅读