I have a folder structure like Project
As the whole project will be packaged into a jar file, I have to read a file from resources using getResourceAsStream. Although I have read through all questions about getResourceAsStream, I still can't get this working. Could anyone help? Thank you!
public class TestMain {
public static void main(String[] args) throws Exception{
// TODO Auto-generated method stub
InputStream stream = TestMain.class.getResourceAsStream("\resources\test.txt");
System.out.println(stream);
BufferedReader bufRead = new BufferedReader(new InputStreamReader(stream));
StringBuilder builder = new StringBuilder();
String line=null;
while((line=bufRead.readLine())!=null){
builder.append(line).append("\n");
}
System.out.println(builder.toString());
}
}
Basically, there are 2 different methods: ClassLoader.getResourceAsStream()
and Class.getResourceAsStream()
. These two methods will locate the resource differently.
In Class.getResourceAsStream(path)
, the path is interpreted as a path local to the package of the class you are calling it from. For example calling, String.getResourceAsStream("file.txt")
will look for a file in your classpath at the following location: "java/lang/file.txt"
. If your path starts with a /
, then it will be considered an absolute path, and will start searching from the root of the classpath. So calling String.getResourceAsStream("/myfile.txt")
will look at the following location in your class path ./file.txt.
ClassLoader.getResourceAsStream(path)
will consider all paths to be absolute paths. So calling String.getClassLoader().getResourceAsString("myfile.txt")
and String.getClassLoader().getResourceAsString("/file.txt")
will both look for a file in your classpath at the following location: ./file.txt
.
Every time the location, it could be a location in your filesystem itself, or inside the corresponding jar file, depending on the Class and/or ClassLoader you are loading the resource from.
IF you are loading the class from an Application Server, so your should use Thread.currentThread().getContextClassLoader().getResourceAsStream(fileName)
instead of this.getClass().getClassLoader().getResourceAsStream(fileName)
. this.getClass().getResourceAsStream()
will also work.
似乎文件夹“资源”在您的类路径中,在其下获取资源时不需要它,请尝试以下
InputStream stream = TestMain.class.getResourceAsStream("test.txt");
Is your test.txt in your classpath? I think that your test.txt is not inside your classpath. you have many solutions for to do that.
one could be give the fullpath of your file (c:/......)
verify when you generate .jar file your txt is inside .jar. if not include your resource folder inside your java project. when you include made a path directly for getResourceAsStream ("test.txt")
For disacoplated resource of your java project use a first option but if it not make sense use the second option .
Assume that you are using a httpclient:
HttpClient httpClient = new HttpClient();
httpClient.getHostConfiguration().setProxy(proxyHost, proxyPort);//your proxyHost & your proxyPort,
GetMethod getMethod = new GetMethod(url);//your url,
try {
httpClient.executeMethod(getMethod);
//strData = getMethod.getResponseBodyAsString();
InputStream resStream = getMethod.getResponseBodyAsStream();
BufferedReader br = new BufferedReader(new InputStreamReader(resStream));
StringBuffer resBuffer = new StringBuffer();
String resTemp = "";
while((resTemp = br.readLine()) != null){
resBuffer.append(resTemp);
}
String response = resBuffer.toString();
} catch (Exception e) {
System.out.println("HttpProxyManager.getResponse returns NULL");
e.printStackTrace();
} finally {
getMethod.releaseConnection();
}
the string response should be what you want to get.
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