急急急~~~Java从文本框读取数据并写入文件，为什么str[i]都没有数据，怎么改。。。

Question

package UI;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.PrintWriter;

import javax.swing.*;

//录入个人信息界面
public class PersonUI extends JFrame{
String []str=new String[13];
public void personUI(){
PersonUI personfr=new PersonUI();
personfr.setTitle("医疗中心管理系统");
personfr.setLayout(new BorderLayout(5,5));
personfr.setSize(1000,300);
personfr.setBackground(Color.white);
personfr.setLocationRelativeTo(getParent());
personfr.setVisible(true);

    JLabel lb1=new JLabel("个人信息录入",JLabel.CENTER);
    lb1.setFont(new java.awt.Font("仿宋",1,30));
    personfr.add(lb1,BorderLayout.NORTH);

    JPanel pn2=new JPanel();
    pn2.setLayout(new GridLayout(7,2));


    JLabel lb2=new JLabel("姓名",JLabel.CENTER);
    lb2.setFont(new java.awt.Font("仿宋",1,15));
    pn2.add(lb2);
    JTextField field1=new JTextField(10);
    pn2.add(field1);

    JLabel lb3=new JLabel("个人编号",JLabel.CENTER);
    lb3.setFont(new java.awt.Font("仿宋",1,15));
    pn2.add(lb3);
    JTextField field2=new JTextField(10);
    pn2.add(field2);

    JLabel lb4=new JLabel("人员类别",JLabel.CENTER);
    lb4.setFont(new java.awt.Font("仿宋",1,15));
    pn2.add(lb4);
    JTextField field3=new JTextField(10);
    pn2.add(field3);

    JLabel lb5=new JLabel("报销类别",JLabel.CENTER);
    lb5.setFont(new java.awt.Font("仿宋",1,15));
    pn2.add(lb5);
    JTextField field4=new JTextField(10);
    pn2.add(field4);

    JLabel lb6=new JLabel("住院次数",JLabel.CENTER);
    lb6.setFont(new java.awt.Font("仿宋",1,15));
    pn2.add(lb6);
    JTextField field5=new JTextField(10);
    pn2.add(field5);

    JLabel lb7=new JLabel("就诊医院",JLabel.CENTER);
    lb7.setFont(new java.awt.Font("仿宋",1,15));
    pn2.add(lb7);
    JTextField field6=new JTextField(10);
    pn2.add(field6);

    JLabel lb8=new JLabel("就诊时段",JLabel.CENTER);
    lb8.setFont(new java.awt.Font("仿宋",1,15));
    pn2.add(lb8);

    JPanel pn1=new JPanel();
    pn1.setVisible(true);
    pn2.add(pn1);

    JTextField field7=new JTextField(4);
    pn1.add(field7);
    JTextField field8=new JTextField("年");
    pn1.add(field8);
    JTextField field9=new JTextField(2);
    pn1.add(field9);
    JTextField field10=new JTextField("月");
    pn1.add(field10);
    JTextField field11=new JTextField(2);
    pn1.add(field11);
    JTextField field12=new JTextField("日");
    pn1.add(field12);
    JTextField field13=new JTextField("  至   ");
    pn1.add(field13);
    JTextField field14=new JTextField(4);
    pn1.add(field14);
    JTextField field15=new JTextField("年");
    pn1.add(field15);
    JTextField field16=new JTextField(2);
    pn1.add(field16);
    JTextField field17=new JTextField("月");
    pn1.add(field17);
    JTextField field18=new JTextField(2);
    pn1.add(field18);
    JTextField field19=new JTextField("日");
    pn1.add(field19);

    pn2.setVisible(true);
    personfr.add(pn2,BorderLayout.CENTER);


    JPanel pn3=new JPanel();
    pn3.setLayout(new FlowLayout(1,20,4));
    JButton bn7=new JButton("确定");
    JButton bn8=new JButton("上一步");
    bn7.setSize(30,15);
    bn8.setSize(30,15);
    pn3.add(bn8);
    pn3.add(bn7);
    pn3.setVisible(true);
    personfr.add(pn3,BorderLayout.SOUTH);

    //监听器
    bn7.addActionListener(new ActionListener(){
        public void actionPerformed(ActionEvent e){
            save();
            personfr.dispose();
        }                  //保存信息
    });

    bn8.addActionListener(new ActionListener(){
        public void actionPerformed(ActionEvent e){
            personfr.dispose();
            BaseFunction basefunction=new BaseFunction();
            basefunction.basefunction();
        }                  
    });

    str[0]=field1.getText();
    System.out.println(str[0]);
    str[1]=field2.getText();
    str[2]=field3.getText();
    str[3]=field4.getText();
    str[4]=field5.getText();
    str[5]=field6.getText();
    str[7]=field7.getText();
    str[8]=field9.getText();
    str[9]=field11.getText();
    str[10]=field14.getText();
    str[11]=field16.getText();
    str[12]=field18.getText();


}
public void save(){
    File personfile=new File("E:\\person.txt");
    if(personfile.exists()&&personfile.isFile()){
           //使用现有的文件
    }
    else
    {
        try{
            //创建文件
            personfile.createNewFile();
        }
        catch(IOException e)
        {
            System.out.println("创建personfile.txt文件失败.错误信息："+e.getMessage());
            return;
        }
    }

    //写入数据
    try
    {
        PrintWriter pw = new PrintWriter(personfile);
        for(int i=0;i<12;i++)
        {
            pw.write(str[i]);
        }
        pw.close();
    }
    catch(FileNotFoundException e)
    {
        System.out.println("找不到文件！错误信息为："+e.getMessage());
    }
}

public PersonUI(){  
}

}

Answer 1

你是在监听函数外面获取的，肯定获取不到，你应该在点击函数里面获取，每点击一次获取一次