Java 如何将数据发送到php服务器并将数据接收到android

我是android编程的新手，我想将数据发送到php服务器并接收数据以在android中显示

但我不知道如何创建它，我不知道如何使用库？可以给我举一些例子来练习

对不起，我的英语不好

示例Myphp“xxx.xxx.x.x/api.php”

---

我想从edittext向php服务器发送

关键字

和

索引

，并接收json数据以显示listview。

HttpURLConnection可用于获取、放置、发布和删除请求：

try {
                // Construct the URL
    URL url = new URL("http://xxxxxxx/webservice/&query="
    +keyword.getText().toString()
    +"&index="+index.getText().toString());
    // Create the request 
            urlConnection = (HttpURLConnection) url.openConnection();
            urlConnection.setRequestMethod("GET");
            urlConnection.connect();
    // Read the input stream into a String
            InputStream inputStream = urlConnection.getInputStream();
            StringBuffer buffer = new StringBuffer();
            if (inputStream == null) {
                // Nothing to do.
                return null;
            }
            reader = new BufferedReader(new InputStreamReader(inputStream));

            String line;
            while ((line = reader.readLine()) != null) {
                // Since it's JSON, adding a newline isn't necessary (it won't affect parsing)
                // But it does make debugging a *lot* easier if you print out the completed
                // buffer for debugging.
                buffer.append(line + "\n");
            }

            if (buffer.length() == 0) {
                // Stream was empty.  No point in parsing.

            }
            JsonStr = buffer.toString(); //result
} catch (IOException e) {
 }

---

其中

关键字

和

索引

将是您的编辑文本变量。

哦！对不起，我忘了告诉php文件名

“111.11.11/api.php”

，无法使用

http://xxxxxxx/webservice/&query=“…

ok然后将url替换为111.11.11/api.php？&query=“+关键字.getText（）.toString（）+”&index=“+index.getText（）.toString（））)我收到错误行

返回null

无法从具有无效结果类型的方法返回值。

connect（）

是多余的。输入流不能为null，因此对此进行测试毫无意义。异常应该传播到调用方，而不是被吞没。@EJP您能给我举个例子吗？或者告诉我该怎么办

try {
                // Construct the URL
    URL url = new URL("http://xxxxxxx/webservice/&query="
    +keyword.getText().toString()
    +"&index="+index.getText().toString());
    // Create the request 
            urlConnection = (HttpURLConnection) url.openConnection();
            urlConnection.setRequestMethod("GET");
            urlConnection.connect();
    // Read the input stream into a String
            InputStream inputStream = urlConnection.getInputStream();
            StringBuffer buffer = new StringBuffer();
            if (inputStream == null) {
                // Nothing to do.
                return null;
            }
            reader = new BufferedReader(new InputStreamReader(inputStream));

            String line;
            while ((line = reader.readLine()) != null) {
                // Since it's JSON, adding a newline isn't necessary (it won't affect parsing)
                // But it does make debugging a *lot* easier if you print out the completed
                // buffer for debugging.
                buffer.append(line + "\n");
            }

            if (buffer.length() == 0) {
                // Stream was empty.  No point in parsing.

            }
            JsonStr = buffer.toString(); //result
} catch (IOException e) {
 }