Java 无法从.txtfile填充JTable
我有一个包含以下数据的.txt文件(注意:文件中的数据会定期更新,所以我不知道确切的行数)。我的Java应用程序在JTable中显示这些数据。这是我的txt文件:Java 无法从.txtfile填充JTable,java,swing,user-interface,file-io,jtable,Java,Swing,User Interface,File Io,Jtable,我有一个包含以下数据的.txt文件(注意:文件中的数据会定期更新,所以我不知道确切的行数)。我的Java应用程序在JTable中显示这些数据。这是我的txt文件: root 1 0 0 09:49 ? 00:00:00 init [5] root 2 0 0 09:49 ? 00:00:00 [kthreadd] root 3 2 0 09:49 ? 00:00:00 [k
root 1 0 0 09:49 ? 00:00:00 init [5]
root 2 0 0 09:49 ? 00:00:00 [kthreadd]
root 3 2 0 09:49 ? 00:00:00 [ksoftirqd/0]
root 4 2 0 09:49 ? 00:00:00 [kworker/0:0]
root 6 2 0 09:49 ? 00:00:00 [migration/0]
root 7 2 0 09:49 ? 00:00:00 [watchdog/0]
我为它编写的代码是:
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.event.TableModelListener;
import javax.swing.table.TableModel;
public class Reader {
public Reader(){
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel panel = new JPanel();
BufferedReader reader;
try {
reader = new BufferedReader(new InputStreamReader(new FileInputStream("ProcessList.txt")));
Map<String, Object[]> result = new LinkedHashMap<String, Object[]>();
while(reader.ready()){
String line = reader.readLine();
String[] values = line.split("\\s+");
String key = values [0] +"&"+values[4] +"&"+values[5]+"&"+values[6]+"&"+values[7];
String uid = values [0];
String strtime = values [4];
String tty = values [5];
String etime = values [6];
String command = values [7];
Integer pid = 0;
Integer pri = 0;
Integer uti = 0;
if (result.containsKey(key)) {
pid = (Integer) ((Object[]) result.get(key))[1];
pri = (Integer) ((Object[]) result.get(key))[2];
uti = (Integer) ((Object[]) result.get(key))[3];
}
else {}
result.put(key, new Object[]{uid,pid,pri,uti,strtime,tty,etime,command});
}
ArrayList arrayList = new ArrayList(result.values());
JTable table = new JTable(new PTablemodel(arrayList));
panel.add(new JScrollPane(table));
reader.close();
frame.setContentPane(panel);
frame.setVisible(true);
frame.pack();
}
catch (FileNotFoundException e) {
e.printStackTrace();
}
catch(IOException e) {
e.printStackTrace();
}
}
public static void main (String [] args){
new Reader();
}
public class PTablemodel implements TableModel{
final Class[] ColumnClass = new Class[]{String.class, Integer.class, Integer.class,Integer.class, String.class, String.class,String.class, String.class};
final String[] columnname = new String[]{"User","PID","Priority","Utilization","TTY","StartTime","EndTime","Command"};
List values = null;
public PTablemodel (List values){
this.values = values;
}
@Override
public void addTableModelListener(TableModelListener l) {
}
@Override
public Class<?> getColumnClass(int columnIndex) {
return ColumnClass[columnIndex];
}
@Override
public int getColumnCount() {
return ColumnClass.length;
}
@Override
public String getColumnName(int columnIndex) {
return columnname[columnIndex];
}
@Override
public int getRowCount() {
return values.size();
}
@Override
public Object getValueAt(int rowIndex, int columnIndex) {
return ((Object[]) values.get(rowIndex))[columnIndex];
}
@Override
public boolean isCellEditable(int rowIndex, int columnIndex) {
return false;
}
@Override
public void removeTableModelListener(TableModelListener l) {
}
@Override
public void setValueAt(Object aValue, int rowIndex, int columnIndex) {
}
}
}
导入java.io.BufferedReader;
导入java.io.FileInputStream;
导入java.io.FileNotFoundException;
导入java.io.IOException;
导入java.io.InputStreamReader;
导入java.util.ArrayList;
导入java.util.LinkedHashMap;
导入java.util.List;
导入java.util.Map;
导入javax.swing.JFrame;
导入javax.swing.JPanel;
导入javax.swing.JScrollPane;
导入javax.swing.JTable;
导入javax.swing.event.TableModelListener;
导入javax.swing.table.TableModel;
公共类阅读器{
公众读者(){
JFrame=新JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel面板=新的JPanel();
缓冲读取器;
试一试{
reader=新的BufferedReader(新的InputStreamReader(新的文件InputStream(“ProcessList.txt”));
映射结果=新建LinkedHashMap();
while(reader.ready()){
字符串行=reader.readLine();
字符串[]值=行。拆分(\\s+);
字符串键=值[0]+“&”+值[4]+“&”+值[5]+“&”+值[6]+“&”+值[7];
字符串uid=值[0];
字符串strtime=值[4];
字符串tty=值[5];
字符串时间=值[6];
字符串命令=值[7];
整数pid=0;
整数pri=0;
整数uti=0;
if(结果容器(键)){
pid=(整数)((对象[])result.get(键))[1];
pri=(整数)((Object[])result.get(key))[2];
uti=(整数)((Object[])result.get(key))[3];
}
else{}
put(key,新对象[]{uid,pid,pri,uti,strtime,tty,etime,command});
}
ArrayList ArrayList=新的ArrayList(result.values());
JTable table=newjtable(newptablemodel(arrayList));
添加(新的JScrollPane(表));
reader.close();
frame.setContentPane(面板);
frame.setVisible(true);
frame.pack();
}
catch(filenotfounde异常){
e、 printStackTrace();
}
捕获(IOE异常){
e、 printStackTrace();
}
}
公共静态void main(字符串[]args){
新读者();
}
公共类PTablemodel实现了TableModel{
最终类[]ColumnClass=新类[]{String.Class,Integer.Class,Integer.Class,String.Class,String.Class,String.Class,String.Class,String.Class};
最终字符串[]columnname=新字符串[]{“用户”、“PID”、“优先级”、“利用率”、“TTY”、“开始时间”、“结束时间”、“命令”};
列表值=空;
公共PTablemodel(列表值){
这个值=值;
}
@凌驾
公共void addTableModelListener(TableModelListener l){
}
@凌驾
公共类getColumnClass(int columnIndex){
返回ColumnClass[columnIndex];
}
@凌驾
public int getColumnCount(){
返回ColumnClass.length;
}
@凌驾
公共字符串getColumnName(int columnIndex){
返回columnname[columnIndex];
}
@凌驾
public int getRowCount(){
返回值。size();
}
@凌驾
公共对象getValueAt(int行索引、int列索引){
返回((对象[])值。获取(行索引))[columnIndex];
}
@凌驾
公共布尔值isCellEditable(int-rowIndex、int-columnIndex){
返回false;
}
@凌驾
公共void removeTableModelListener(TableModelListener l){
}
@凌驾
public void setValueAt(对象有效、int行索引、int列索引){
}
}
}
我得到的不是错误,而是捕获了异常。有人能指导我吗?我使用了“&”作为标记符
注意:编译器是这样说的:
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 4
at Reader.<init>(Reader.java:30)
at Reader.main(Reader.java:65)
线程“main”java.lang.ArrayIndexOutOfBoundsException中的异常:4
at Reader.(Reader.java:30)
at Reader.main(Reader.java:65)
此代码是基于您的SSCCE的代码,表明它是文件读取代码中的某个内容 输出 代码
package test.t100.t001;
导入java.io.*;
导入java.util.*;
导入javax.swing.*;
导入javax.swing.event.TableModelListener;
导入javax.swing.table.TableModel;
公共类阅读器{
静态字符串name=“ProcessList”;
公共读取器(字符串名称){
JFrame=新JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel面板=新的JPanel();
缓冲读取器;
试一试{
文件f=新文件(名称);
System.out.println(“文件-存在:+f.exists()+”+f.getAbsolutePath());
读卡器=新的BufferedReader(
新的InputStreamReader(
新文件输入流(f));
映射结果=新建LinkedHashMap();
while(reader.ready()){
字符串行=reader.readLine();
字符串[]值=行。拆分(\\s+);
字符串键=值[0]+“&”+值[4]+“&”+值[5]+“&”+值[6]+“&”+值[7];
字符串uid=值[0];
字符串strtime=值[4];
字符串tty=值[5];
字符串时间=值[6];
字符串命令=值[7];
整数pid=0;
整数pri=0;
整数uti=0;
if(结果容器(键)){
pid=(英寸)
File - exists: true I:\projects\eclipse\Test\ProcessList.txt
Frame is visible
File - exists: false I:\projects\eclipse\Test\ProcessList1.txt
java.io.FileNotFoundException: ProcessList1.txt (The system cannot find the file specified)
...
package test.t100.t001;
import java.io.*;
import java.util.*;
import javax.swing.*;
import javax.swing.event.TableModelListener;
import javax.swing.table.TableModel;
public class Reader {
static String name = "ProcessList";
public Reader(String name){
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel panel = new JPanel();
BufferedReader reader;
try {
File f = new File(name);
System.out.println("File - exists: " + f.exists() + " " + f.getAbsolutePath());
reader = new BufferedReader(
new InputStreamReader(
new FileInputStream(f)));
Map<String, Object[]> result = new LinkedHashMap<String, Object[]>();
while(reader.ready()){
String line = reader.readLine();
String[] values = line.split("\\s+");
String key = values [0] +"&"+values[4] +"&"+values[5]+"&"+values[6]+"&"+values[7];
String uid = values [0];
String strtime = values [4];
String tty = values [5];
String etime = values [6];
String command = values [7];
Integer pid = 0;
Integer pri = 0;
Integer uti = 0;
if (result.containsKey(key)) {
pid = (Integer) ((Object[]) result.get(key))[1];
pri = (Integer) ((Object[]) result.get(key))[2];
uti = (Integer) ((Object[]) result.get(key))[3];
}
else {}
result.put(key, new Object[]{uid,pid,pri,uti,strtime,tty,etime,command});
}
ArrayList arrayList = new ArrayList(result.values());
JTable table = new JTable(new PTablemodel(arrayList));
panel.add(new JScrollPane(table));
reader.close();
frame.setContentPane(panel);
frame.setVisible(true);
frame.pack();
System.out.println("Frame is visible");
}
catch (FileNotFoundException e) {
e.printStackTrace();
}
catch(IOException e) {
e.printStackTrace();
}
}
public static void main (String [] args) throws IOException{
String s =
"root 1 0 0 09:49 ? 00:00:00 init [5]\n" +
"root 2 0 0 09:49 ? 00:00:00 [kthreadd]\n" +
"root 3 2 0 09:49 ? 00:00:00 [ksoftirqd/0]\n" +
"root 4 2 0 09:49 ? 00:00:00 [kworker/0:0]\n" +
"root 6 2 0 09:49 ? 00:00:00 [migration/0]\n" +
"root 7 2 0 09:49 ? 00:00:00 [watchdog/0]\n";
ByteArrayOutputStream baos = new ByteArrayOutputStream();
FileOutputStream fos = new FileOutputStream(name + ".txt");
fos.write(s.getBytes());
new Reader(name + ".txt");
new Reader(name + "1.txt");
}
public class PTablemodel implements TableModel{
final Class[] ColumnClass = new Class[]{String.class, Integer.class, Integer.class,Integer.class, String.class, String.class,String.class, String.class};
final String[] columnname = new String[]{"User","PID","Priority","Utilization","TTY","StartTime","EndTime","Command"};
List values = null;
public PTablemodel (List values){
this.values = values;
}
@Override
public void addTableModelListener(TableModelListener l) {
}
@Override
public Class<?> getColumnClass(int columnIndex) {
return ColumnClass[columnIndex];
}
@Override
public int getColumnCount() {
return ColumnClass.length;
}
@Override
public String getColumnName(int columnIndex) {
return columnname[columnIndex];
}
@Override
public int getRowCount() {
return values.size();
}
@Override
public Object getValueAt(int rowIndex, int columnIndex) {
return ((Object[]) values.get(rowIndex))[columnIndex];
}
@Override
public boolean isCellEditable(int rowIndex, int columnIndex) {
return false;
}
@Override
public void removeTableModelListener(TableModelListener l) {
}
@Override
public void setValueAt(Object aValue, int rowIndex, int columnIndex) {
}
}
}
while((String line = reader.readLine())!=null) {
...
}