如何从 URL 获取字符串

发布于 2024-12-04 23:51:42 字数 848 浏览 1 评论 0原文

我的应用程序从 PHP Web 服务器获取大部分数据。

我的问题是当服务器返回错误时。错误不是 HTML 页面，而是简单的字符串。例如：

ERROR001

可以代表无效名称。

这是我的代码：

String responseBody = null;
URL url = new URL(strUrl);
URLConnection connection;
connection = url.openConnection();
connection.setUseCaches(false);
InputStream isResponse = (InputStream) connection.getContent(); // on errors I get IOException here
responseBody = convertStreamToString (isResponse);

当我使用它时，我在 connection.getContent(); 上收到 IOException;

我也尝试过：

HttpGet getMethod = new HttpGet(url);
String responseBody = null;
responseBody = mClient.execute(getMethod,mResponseHandler); // on errors I getClientProtocolException

但我在 mClient.execute 上得到 getClientProtocolException

有什么想法如何将 ERROR001 这样的结果读取到字符串中吗？

原文

My application gets most of its data from a php web server.

My problem is when the server return errors.
The errors are not HTML pages, but simple strings.
for example:

ERROR001

could stand for invalid name.

here is my code:

String responseBody = null;
URL url = new URL(strUrl);
URLConnection connection;
connection = url.openConnection();
connection.setUseCaches(false);
InputStream isResponse = (InputStream) connection.getContent(); // on errors I get IOException here
responseBody = convertStreamToString (isResponse);

When I use it, I get IOException on connection.getContent();

I also tried:

HttpGet getMethod = new HttpGet(url);
String responseBody = null;
responseBody = mClient.execute(getMethod,mResponseHandler); // on errors I getClientProtocolException

but I get getClientProtocolException on mClient.execute

Any ideas how I could read a result like ERROR001 into a string?

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柠栀 2024-12-11 23:51:42

问题是，出现错误时，Http 标头为 HTTP 错误 500（内部服务器错误）。
为了读取错误内容，我使用了以下代码：

    String responseBody = null;
    URL url = new URL(strUrl);
    HttpURLConnection connection;
    connection = (HttpURLConnection) url.openConnection();
    connection.setUseCaches(false);
    InputStream isResponse = null;
    try {
        isResponse = connection.getInputStream();
    } catch (IOException e) {
        isResponse = connection.getErrorStream();
    }
    responseBody = convertStreamToString (isResponse);

    return responseBody;

The problem is that on error, the Http header is HTTP Error 500 (Internal server error).
To read the error content I used the following code:

    String responseBody = null;
    URL url = new URL(strUrl);
    HttpURLConnection connection;
    connection = (HttpURLConnection) url.openConnection();
    connection.setUseCaches(false);
    InputStream isResponse = null;
    try {
        isResponse = connection.getInputStream();
    } catch (IOException e) {
        isResponse = connection.getErrorStream();
    }
    responseBody = convertStreamToString (isResponse);

    return responseBody;

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温折酒 2024-12-11 23:51:42

url = new URL(desiredUrl);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("GET");
connection.connect();
reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));

试试这个。
我认为你没有调用connection.connect()方法。

url = new URL(desiredUrl);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("GET");
connection.connect();
reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));

Try this one.
I think you are not calling the connection.connect() method.

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深白境迁sunset 2024-12-11 23:51:42

使用 HttpClient 时会发生什么？
你可能想尝试这个：

String responseBody;

HttpGet request = new HttpGet("your url");
HttpClient client = new DefaultHttpClient();
HttpResponse httpResponse = client.execute(request);
HttpEntity entity = httpResponse.getEntity();

if(entity != null){
    responseBody = convertStreamToString (entity.getContent());
}

What happens when you use HttpClien?
you may want to try this:

String responseBody;

HttpGet request = new HttpGet("your url");
HttpClient client = new DefaultHttpClient();
HttpResponse httpResponse = client.execute(request);
HttpEntity entity = httpResponse.getEntity();

if(entity != null){
    responseBody = convertStreamToString (entity.getContent());
}

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