如何在JovConverter中从doc或pdf阅读文本

Question

原因：java.lang.NullPointerException：尝试在空对象引用上调用虚拟方法'boolean java.io.File.isDirectory（）'

   LocalOfficeManager officeManager = LocalOfficeManager.install();
    try {

        // Start an office process and connect to the started instance (on port 2002).
        officeManager.start();
        File inputFile = new File("storage/emulated/0/COVID-19/111.pdf");
        wordtext=String.valueOf(JodConverter.convert(inputFile));
    } catch (OfficeException e) {
        e.printStackTrace();
    } finally {
        // Stop the office process
        OfficeUtils.stopQuietly(officeManager);
    }

Answer 1

E / AndroidRuntime：致命异常：主要流程：handbook_multi_maker.TJ，PID：17976java.lang.RuntimeException：无法启动活动ComponentInfo {handbook_multi_maker.TJ/TJ.SecondActivity}：java.lang.NullPointerException：尝试在空对象引用上调用虚拟方法'boolean java.io.File.isDirectory（）'在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:3107）在android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:3250）在android.app.servertransaction.LaunchActivityItem.execute（LaunchActivityItem.java:78）在android.app.servertransaction.TransactionExecutor.executeCallbacks（TransactionExecutor.java:108）在android.app.servertransaction.TransactionExecutor.execute（TransactionExecutor.java:68）在android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1947）在android.os.Handler.dispatchMessage（Handler.java:106）在android.os.Looper.loop（Looper.java:214）在android.app.ActivityThread.main（ActivityThread.java:7032）在java.lang.reflect.Method.invoke（本机方法）在com.android.internal.os.RuntimeInit $ MethodAndArgsCaller.run（RuntimeInit.java:493）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:964）原因：java.lang.NullPointerException：尝试在空对象引用上调用虚拟方法'boolean java.io.File.isDirectory（）'在org.jodconverter.local.office.LocalOfficeUtils.validateOfficeHome（LocalOfficeUtils.java:339）在org.jodconverter.local.office.LocalOfficeManager $ Builder.build（LocalOfficeManager.java:169）在org.jodconverter.local.office.LocalOfficeManager.install（LocalOfficeManager.java:78）在TJ.SecondActivity.initWebView（SecondActivity.java:132）在TJ.SecondActivity.onCreate（SecondActivity.java:104）在android.app.Activity.performCreate（Activity.java:7327）在android.app.Activity.performCreate（Activity.java:7318）在android.app.Instrumentation.callActivityOnCreate（Instrumentation.java:1271）在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:3087）在android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:3250）在android.app.servertransaction.LaunchActivityItem.execute（LaunchActivityItem.java:78）在android.app.servertransaction.TransactionExecutor.executeCallbacks（TransactionExecutor.java:108）在android.app.servertransaction.TransactionExecutor.execute（TransactionExecutor.java:68）在android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1947）在android.os.Handler.dispatchMessage（Handler.java:106）在android.os.Looper.loop（Looper.java:214）在android.app.ActivityThread.main（ActivityThread.java:7032）在java.lang.reflect.Method.invoke（本机方法）在com.android.internal.os.RuntimeInit $ MethodAndArgsCaller.run（RuntimeInit.java:493）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:964）。