使用Java的jdb调试我的代码。我停留在我的程序需要命令行输入的位置,但是jdb将其作为jdb命令拦截。
如何告诉jdb将文本传递给正在运行的程序?
版本:
C:\Documents and Settings\*snip*>java -showversion
java version "1.6.0_17"
Java(TM) SE Runtime Environment (build 1.6.0_17-b04)
Java HotSpot(TM) Client VM (build 14.3-b01, mixed mode, sharing)
编译:
javac -g LZWDecompress.java
jdb.ini:
stop in LZWDecompress.decompress
run
monitor list
这就是:
Initializing jdb ...
*** Reading commands from C:\Documents and Settings\*snip*\jdb.ini
Deferring breakpoint LZWDecompress.decompress.
It will be set after the class is loaded.
> run LZWDecompress
Set uncaught java.lang.Throwable
Set deferred uncaught java.lang.Throwable
> > >
VM Started: Set deferred breakpoint LZWDecompress.decompress
File to be decompressed:
在上面的提示中,我输入“test”,并收到此回复:
...
VM Started: Set deferred breakpoint LZWDecompress.decompress
File to be decompressed: test
Unrecognized command: 'test'. Try help...
>
这是函数main(...)的代码,由我们的教师编写,而不是我:
public static void main(String[] args) throws IOException {
short [] source;
int dlen;
int sz;
byte [] decompressed;
BufferedReader br;
DataInputStream In;
FileInputStream FI;
FileOutputStream FO;
InputStreamReader isr;
String cfnm;
String sfnm;
source = new short[INPUT_FILE_IO_BUFFER_SIZE];
decompressed = new byte[OUTPUT_FILE_IO_BUFFER_SIZE];
isr = new InputStreamReader(System.in);
br = new BufferedReader(isr);
System.out.print("File to be decompressed: ");
System.out.flush();
sfnm = br.readLine();
System.out.print("Name of the decompressed file: ");
System.out.flush();
cfnm = br.readLine();
FI = new FileInputStream(sfnm);
In = new DataInputStream(FI);
FO = new FileOutputStream(cfnm);
for (sz=0; true; ++sz) {
try { source[sz] = In.readShort();
} catch (EOFException e) { break;
} catch (Exception e) { System.out.print(e.toString());
}
}
dlen = decompress(source, sz, decompressed);
FO.write(decompressed, 0, dlen);
FO.close();
} // end main()
答案 0 :(得分:6)
嗯......这个post似乎表明我需要运行程序,然后将调试器附加到它。例如:
% java -Xdebug -Xrunjdwp:transport=dt_socket,address=8000,server=y,suspend=n LZWDecompress
% jdb -connect com.sun.jdi.SocketAttach:hostname=localhost,port=8000
在通过用户输入函数后,如何让程序停止,并不是很明显。
这是首选方法吗?
更新:一旦正在运行的程序提示用户输入,请附加并配置jdb(例如,断点)。配置jdb后,为正在运行的程序提供输入。然后jdb在第二个窗口中接管程序执行。 :d