Question

我指定了这些文件地址data/data/org.com.Cache/files/cacheImplementationOutput，但我收到以下错误消息.....

java.io.IOException: Couldn't open /data/data/org.com.Cache/files/cacheImplementationOutput

Answer 1

将方法名称称为fetch（url，outputXml）;

并将xml内容读作.... FileInputStream fis = openFileInput（outputXml）;

public byte [] readBytes（InputStream inputStream，String outputXml）{ 尝试{ ByteArrayOutputStream byteBuffer = new ByteArrayOutputStream（）; int bufferSize = 1024; byte [] buffer = new byte [bufferSize]; OutputStreamWriter fout = new OutputStreamWriter（openFileOutput（ outputXml，0））; int len = 0; while（（len = inputStream.read（buffer））！= -1）{ byteBuffer.write（buffer，0，len）; } fout.write（new String（byteBuffer.toByteArray（）））; fout.close（）; return byteBuffer.toByteArray（）; } catch（NullPointerException e）{ e.printStackTrace（）; } catch（例外e）{ } return null;

}

public void fetch(URL url, String outputXml) {
    try {

        InputStream myInputStream = null;
        StringBuilder sb = new StringBuilder();

        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setDoOutput(true);
        conn.setRequestMethod("POST");
        conn.setRequestProperty("Content-Type", "application/xml");
        OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());
        wr.write(sb.toString());
        wr.flush();
        wr.close();
        myInputStream = conn.getInputStream();
        readBytes(myInputStream, outputXml);
        System.out.println("writing is done");
    }catch (NullPointerException e) {
        e.printStackTrace();
    } 
    catch (Exception e) {
    }

}

Answer 2

您忘记了商店地址开头的/ ...

所以data/data/org.com.Cache/files/cacheImplementationOutput就像data/data/org.com.Cache/data/data/org.com.Cache/files/cacheImplementationOutput

一样

我将xml文件存储在内存中，但我无法访问它

2 个答案: