我是Java的新手,但我需要制作一个扫描仪(内置的ocr)向浏览器输出一些内容。我还没有访问浏览器,但是当我将其作为应用程序运行时,代码可以运行。 使用扫描仪,我收到了Java代码,使扫描仪拍照,然后从中读取并将其输出回控制台。我添加了几行来使它成为applet:
import gx.*;
import pr.*;
import java.applet.*;
public class DocScan extends Applet
{
/**
*
*/
private static final long serialVersionUID = 1L;
static
{
try
{
System.loadLibrary("jgx");
System.loadLibrary("jpr");
}
catch (UnsatisfiedLinkError e)
{
System.err.println("Native code library failed to load." + e);
System.exit(1);
}
}
public static void main(String argv[])
{
Lib lib = new Lib();
String text;
String[] ec ={ "Ok", "Warning", "Error" };
try
{
/* Opening the PR system */
lib.FunctionStart("Opening system files");
PassportReader pr = new PassportReader(); /* Object for the PR system */
lib.FunctionEnd();
/* Validity check */
if (!pr.IsValid())
{
lib.Error("Failed to initialize!");
lib.PrintStat();
}
/* Connecting to the first device */
lib.FunctionStart("Connecting to the first device");
pr.UseDevice(0, jpr.PR_UMODE_FULL_CONTROL);
lib.FunctionEnd();
/* Using the device */
while (!lib.KbHit())
{
lib.ProcessStart("Processing document");
try
{
/* Capturing images */
lib.FunctionStart("Capturing images");
pr.Capture();
lib.FunctionEnd();
/* Getting document data */
lib.FunctionStart("Recognizing.");
prDoc doc = pr.Recognize(0);
lib.FunctionEnd();
if (!doc.IsValid()) lib.WriteLine("No data found.");
else
{
/* Displaying document type */
lib.WriteLine("Document type: " + doc.Code() + ", status: " + ec[doc.Status() / 100]);
/* Get some fixed fields and displaying them */
text = doc.Field(jpr.PR_DF_NAME);
if (!text.equals("")) lib.WriteLine("NAME \"" + text + "\" [" + ec[doc.FieldStatus(jpr.PR_DF_NAME) / 100] + "]");
text = doc.Field(jpr.PR_DF_DOCUMENT_NUMBER);
if (!text.equals("")) lib.WriteLine("DOCUMENT NUMBER \"" + text + "\" [" + ec[doc.FieldStatus(jpr.PR_DF_DOCUMENT_NUMBER) / 100] + "]");
text = doc.Field(jpr.PR_DF_EXPIRY_DATE);
if (!text.equals("")) lib.WriteLine("EXPIRY DATE \"" + text + "\" [" + ec[doc.FieldStatus(jpr.PR_DF_EXPIRY_DATE) / 100] + "]");
/* Searching for fields and displaying them */
gxVariant pdoc = doc.ToVariant();
gxVariant fieldlist = new gxVariant();
pdoc.GetChild(fieldlist, jgx.GX_VARIANT_BY_ID, jpr.PRV_FIELDLIST, 0);
int nitems = fieldlist.GetNItems();
for (int i = 0; i < nitems; i++)
{
gxVariant field = new gxVariant();
fieldlist.GetItem(field, jgx.GX_VARIANT_BY_INDEX, 0, i);
int field_code = field.GetInt();
text = doc.Field(field_code);
if (!text.equals("")) lib.WriteLine("[" + field_code + "] \"" + text + "\" [" + ec[doc.FieldStatus(field_code) / 100] + "]");
if (field_code >= jpr.PR_DF_FORMATTED) continue;
try
{
gxImage img = doc.FieldImage(field_code);
if (img.IsValid()) img.Save(field_code + ".jpg", jgx.GX_JPEG);
}
catch (RuntimeException e)
{
lib.DisplExcp(e);
}
}
}
}
catch (RuntimeException e)
{
lib.DisplExcp(e);
}
lib.ProcessEnd();
lib.WaitForSec(3);
}
/* Closing the device */
lib.FunctionStart("Closing the device");
pr.CloseDevice();
lib.FunctionEnd();
}
catch (RuntimeException e)
{
lib.DisplExcp(e);
}
lib.PrintStat();
}
}
我使用Eclipse作为IDE。现在我的目标是简单地让扫描仪“闪烁”。我知道输出是在控制台上,我不会在applet中看到任何内容,但它应该仍然闪烁。
当我将此代码作为应用程序运行时,它可以工作。扫描仪拍摄照片然后将其读取的内容输出到控制台。
当我将此代码作为Applet运行时,applet启动并且什么都不做。它只是停留在那里没有任何错误(至少Eclipse正在向我展示)。
我读到我应该允许applet访问,所以我编辑了:
c:\program files\java\jre8\lib\security\java.policy
并在最后添加:
grant {
permission java.security.AllPermission;
};
哪个应该允许applet完全访问。但是,没有任何变化 - 小程序仍然启动并且什么都不做。
有人能指出我正确的方向吗?当我将它作为applet运行时,为什么代码不起作用?