java - 不打印到文本框

Question

我正在尝试创建一种从哈希表中检索用户输入的articleName 的authorID 的方法。以下是当用户按下按钮时在客户端激活的代码:

public String getAuthorID() // returns a String
    {
             try
        {
            articleName = txtArticleName.getText();
            argAuthorID = new Vector();// create vector for the args
            argAuthorID.addElement(articleName);// name to search for to get AuthorID

            // make the call to the server
            authorIDVector = (Integer)client.execute("GetSize.sendAuthorID", argAuthorID);
            System.out.println(argAuthorID);
          }
            catch (XmlRpcException exception) {
            System.err.println("JavaClient: XML-RPC Consumer Fault #" +
            Integer.toString(exception.code) + ": " +
                               exception.getCause() + "" + exception.toString());
          } catch (Exception exception) {
            System.err.println("JavaClient: XML-RPC Consumer Fault #" + exception.toString());
          }
        String StrAuthorID = Integer.toString(authorID); // Cast AuthorID to String
        return StrAuthorID;
    }

这是服务器端的方法:

public int sendAuthorID(String articleNameRequest) {
        // get info from the hashtable
        aNumber = (Integer) theHashtable.getAuthorID(articleNameRequest); // was this.
        return aNumber;
    }

这是包含哈希表的类中的代码:

public int getAuthorID(String articleName)
{
    int intfoundit;
    String foundit =  (String)hashtab.get(articleName);
    System.out.print(foundit);
    intfoundit = Integer.parseInt(foundit);
    System.out.print(foundit);
    System.out.print(intfoundit);
    return intfoundit;
}

程序可以检索 AuthorID，但不会将其输入到文本框中。通过测试我发现异常是由以下代码引发的:

catch (XmlRpcException exception) {
            System.err.println("JavaClient: XML-RPC Consumer Fault #" +
            Integer.toString(exception.code) + ": " +
                               exception.getCause() + "" + exception.toString());

这是给出的错误:

'JavaClient: XML-RPC Consumer Fault #0: nullorg.apache.xmlrpc.XmlRpcException: java.lang.Exception: java.lang.NumberFormatException: For input string: " 3377"'

更新:删除了哈希表中 ID 号之前的空格，它不再抛出错误，但它仍然没有将 ID 号输入到文本框中，而只是输入“0”

Answer 1

当字符串中有空格时，它似乎会失败。正如我们在异常跟踪中看到的那样，parseInt 无法解析 "3377" 并且在执行时抛出了 NumberFormatException:

intfoundit = Integer.parseInt(foundit);

因此，您可以尝试修剪字符串，看看它是否可以解决您的问题:

intfoundit = Integer.parseInt(foundit.trim());

更好的是，您应该在哈希表中保存/放置键/值的位置进行修剪。