“[致命错误]：1:120：不允许匹配“[xX][mM][lL]”的处理指令目标。” [复制]
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【中文标题】“[致命错误]：1:120：不允许匹配“[xX][mM][lL]”的处理指令目标。” [复制]【英文标题】："[Fatal Error] :1:120: The processing instruction target matching "[xX][mM][lL]" is not allowed." [duplicate] 【发布时间】：2011-05-13 06:26:02 【问题描述】：这对你来说很难。
我正在创建一个点对点聊天程序的课堂项目，但我遇到了这个问题：
当我打开一个聊天窗口时，没有问题。当我打开第二个窗口并尝试登录聊天时，我收到此错误：
**[Fatal Error] :1:120: The processing instruction target matching "[xX][mM][lL]" is not allowed.
org.xml.sax.SAXParseException: The processing instruction target matching "[xX][mM][lL]" is not allowed.
at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:249)
at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:284)
at javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:124)
at chatter2.Chatter.process(Chatter.java:240)
at chatter2.Chatter.run(Chatter.java:222)
at java.lang.Thread.run(Thread.java:680)**
我很确定这与我的代码为参与者创建 XML 的方式有关。
这是我写的所有代码：
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
/*
* NewJFrame.java
*
* Created on Nov 10, 2010, 2:11:39 PM
*/
package chatter2;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.io.StringBufferInputStream;
import java.io.StringReader;
import java.net.Socket;
import java.util.LinkedList;
import java.util.List;
import javax.swing.DefaultListModel;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.xml.sax.InputSource;
/**
*
* @author ericrea
*/
public class Chatter extends javax.swing.JFrame implements Runnable
PrintWriter out = null;
BufferedReader in = null;
boolean running = true;
String partName = "";
String chatHist = "";
/** Creates new form NewJFrame */
public Chatter()
initComponents();
Server server = new Server();
server.start();
/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents()
jPanel1 = new javax.swing.JPanel();
msgText = new javax.swing.JTextArea();
send = new javax.swing.JButton();
jPanel2 = new javax.swing.JPanel();
chatText = new javax.swing.JTextArea();
jPanel3 = new javax.swing.JPanel();
userName = new javax.swing.JTextField();
IPaddress = new javax.swing.JTextField();
PortField = new javax.swing.JTextField();
Login = new javax.swing.JButton();
jButton1 = new javax.swing.JButton();
jPanel4 = new javax.swing.JPanel();
chatMembers = new javax.swing.JList();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setMinimumSize(new java.awt.Dimension(550, 550));
jPanel1.setLayout(new java.awt.GridLayout(1, 0));
msgText.setColumns(20);
msgText.setRows(5);
msgText.setPreferredSize(new java.awt.Dimension(240, 24));
msgText.setRequestFocusEnabled(false);
jPanel1.add(msgText);
send.setText("Send");
send.setPreferredSize(new java.awt.Dimension(100, 29));
send.setRolloverEnabled(true);
send.setSelected(true);
send.addActionListener(new java.awt.event.ActionListener()
public void actionPerformed(java.awt.event.ActionEvent evt)
sendActionPerformed(evt);
);
jPanel1.add(send);
getContentPane().add(jPanel1, java.awt.BorderLayout.PAGE_END);
jPanel2.setLayout(new java.awt.GridLayout(1, 0));
chatText.setBackground(new java.awt.Color(0, 255, 204));
chatText.setColumns(20);
chatText.setRows(5);
jPanel2.add(chatText);
getContentPane().add(jPanel2, java.awt.BorderLayout.LINE_END);
jPanel3.setLayout(new java.awt.GridLayout(1, 0));
userName.setText("UserName");
jPanel3.add(userName);
IPaddress.setText("127.0.0.1");
IPaddress.addActionListener(new java.awt.event.ActionListener()
public void actionPerformed(java.awt.event.ActionEvent evt)
IPaddressActionPerformed(evt);
);
jPanel3.add(IPaddress);
PortField.setText("44640");
jPanel3.add(PortField);
Login.setText("Login");
Login.addActionListener(new java.awt.event.ActionListener()
public void actionPerformed(java.awt.event.ActionEvent evt)
LoginActionPerformed(evt);
);
jPanel3.add(Login);
jButton1.setText("Logout");
jPanel3.add(jButton1);
getContentPane().add(jPanel3, java.awt.BorderLayout.PAGE_START);
chatMembers.setBorder(javax.swing.BorderFactory.createLineBorder(new java.awt.Color(0, 0, 0)));
chatMembers.setModel(new javax.swing.AbstractListModel()
String[] strings = "Item 1", "Item 2", "Item 3", "Item 4", "Item 5" ;
public int getSize() return strings.length;
public Object getElementAt(int i) return strings[i];
);
chatMembers.setPreferredSize(new java.awt.Dimension(80, 87));
jPanel4.add(chatMembers);
getContentPane().add(jPanel4, java.awt.BorderLayout.LINE_START);
pack();
// </editor-fold>
private void LoginActionPerformed(java.awt.event.ActionEvent evt)
try
Socket s = new Socket(IPaddress.getText(), Integer.parseInt(PortField.getText()));
out = new PrintWriter(s.getOutputStream());
in = new BufferedReader(new InputStreamReader(s.getInputStream()));
new Thread(this).start();
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder docBuilder = factory.newDocumentBuilder();
Document doc = docBuilder.newDocument();
Element root = doc.createElement("login");
doc.appendChild(root);
root.appendChild(doc.createTextNode(userName.getText()));
TransformerFactory fact = TransformerFactory.newInstance();
Transformer trans = fact.newTransformer();
DOMSource source = new DOMSource(doc);
StreamResult sResult = new StreamResult(out);
trans.transform(source, sResult);
out.println("\n");
out.flush();
catch (Exception e)
private void IPaddressActionPerformed(java.awt.event.ActionEvent evt)
// TODO add your handling code here:
private void sendActionPerformed(java.awt.event.ActionEvent evt)
/**
* @param args the command line arguments
*/
public static void main(String args[])
java.awt.EventQueue.invokeLater(new Runnable()
public void run()
new Chatter().setVisible(true);
);
// Variables declaration - do not modify
private javax.swing.JTextField IPaddress;
private javax.swing.JButton Login;
private javax.swing.JTextField PortField;
private javax.swing.JList chatMembers;
private javax.swing.JTextArea chatText;
private javax.swing.JButton jButton1;
private javax.swing.JPanel jPanel1;
private javax.swing.JPanel jPanel2;
private javax.swing.JPanel jPanel3;
private javax.swing.JPanel jPanel4;
private javax.swing.JTextArea msgText;
private javax.swing.JButton send;
private javax.swing.JTextField userName;
// End of variables declaration
public void run()
String buffer = "";
while (running)
try
String line = in.readLine();
System.out.println(line);
if (line.equals(""))
process(buffer);
else
buffer = buffer + line;
catch (Exception e)
public void process(String buffer)
try
System.out.println("buffer in process is " + buffer);
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder docBuilder = factory.newDocumentBuilder();
Document doc = docBuilder.parse(new StringBufferInputStream(buffer)); //new InputSource(new StringReader(buffer))
Element root = doc.getDocumentElement();
if (root.getNodeName().equals("message"))
chatHist = chatHist + root.getTextContent() + "\n";
newMessage();
else if (root.getNodeName().equals("participants"))
DefaultListModel partNames = new DefaultListModel();
for(int i = 0; i < root.getChildNodes().getLength(); i++)
//partName = partName + root.getChildNodes().item(i).getTextContent() + "/n";
partNames.addElement(root.getChildNodes().item(i).getTextContent());
chatMembers.setModel(partNames);
catch (Exception e) e.printStackTrace();
public void cleanStop()
public void newMessage()
chatText.setText(chatHist);
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package chatter2;
import java.io.*;
import java.net.*;
import java.util.LinkedList;
import java.util.List;
import org.w3c.dom.Document;
/**
*
* @author ericrea
*/
public class Server extends Thread
private ServerSocket ss = null;
private List<Participant> parts = new LinkedList<Participant>();
public Server()
try
ss = new ServerSocket(44640);
catch(Exception e)e.printStackTrace();
@Override
public void run()
//add this into a while loop
while (true)
try
Socket s = ss.accept();
Participant p = new Participant(this, s);
p.start();
getParts().add(p);
catch(Exception e)
e.printStackTrace();
// System.out.println(" Got a client socket connection");
// PrintWriter out = new PrintWriter(s.getOutputStream());
// BufferedReader in = new BufferedReader(new InputStreamReader(s.getInputStream()));
// out.println("hey there, want to chat");
// out.flush();
// String line = in.readLine();
// System.out.println("Client said: " + line);
public void message(Document doc)
for (Participant p: getParts())
p.newMessage(doc);
public void newParticipants()
int counter = 1;
for(Participant p: getParts())
//System.out.println(counter + " time through the loop");
counter++;
p.newParticipant();
public void cleanStop()
public void logout(Participant p)
parts.remove(p);
newParticipants();
/**
* @return the ss
*/
public ServerSocket getSs()
return ss;
/**
* @param ss the ss to set
*/
public void setSs(ServerSocket ss)
this.ss = ss;
/**
* @return the parts
*/
public List<Participant> getParts()
return parts;
/**
* @param parts the parts to set
*/
public void setParts(List<Participant> parts)
this.parts = parts;
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package chatter2;
import java.io.*;
import java.util.*;
import java.net.*;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.xml.sax.InputSource;
/**
*
* @author ericrea
*/
public class Participant extends Thread
Server server = null;
Socket client = null;
PrintWriter out = null;
BufferedReader in = null;
boolean running = true;
private String partName = null;
public Participant(Server server, Socket client) throws IOException
this.client = client;
this.server = server;
out = new PrintWriter(client.getOutputStream());
in = new BufferedReader(new InputStreamReader(client.getInputStream()));
//run and actONMessage will be in the chatter class as well
@Override
public void run()
String buffer = "";
while (running)
try
String line = in.readLine();
if (line.equals(""))
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder docBuilder = factory.newDocumentBuilder();
Document doc = docBuilder.parse(new InputSource(new StringReader(buffer)));
actOnMessage(doc);
else
buffer = buffer + line;
catch (Exception e)
e.printStackTrace();
public void actOnMessage(Document doc)
Element root = doc.getDocumentElement();
if (root.getNodeName().equals("login"))
setPartName(root.getTextContent());
this.login();
else if (root.getNodeName().equals("message"))
message(doc);
else if (root.getNodeName().equals("logout"))
this.logout();
public void message(Document doc)
server.message(doc);
public void login()
server.newParticipants();
public void logout()
server.logout(this);
public void newMessage(Document doc)
out.println(/*String version of the xml*/);
public void newParticipant()
try
List<Participant> partList = server.getParts();
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder docBuilder = factory.newDocumentBuilder();
Document doc = docBuilder.newDocument();
Element root = doc.createElement("participants");
doc.appendChild(root);
for (Participant k : partList)
Element root1 = doc.createElement("participant");
root.appendChild(root1);
root1.appendChild(doc.createTextNode(k.getPartName()));
TransformerFactory fact = TransformerFactory.newInstance();
Transformer trans = fact.newTransformer();
DOMSource source = new DOMSource(doc);
StreamResult sResult = new StreamResult(out);
trans.transform(source, sResult);
out.println("\n");
out.flush();
catch (Exception e)
public void cleanStop()
public void getParticipantName()
/**
* @return the partName
*/
public String getPartName()
return partName;
/**
* @param partName the partName to set
*/
public void setPartName(String partName)
this.partName = partName;
【问题讨论】：
你包含的chatter2包出现错误；我们不知道这是在做什么，这使得查看您的代码变得无关紧要。 Chatter2 是项目名称。 解决了导致此错误消息的 三个 可能原因中的每一个的解决方法here。 【参考方案1】：问题是您有多个 XML 标头或在一个之前有噪音。
XML 文档的典型开头...
<?xml version='1.0'?>
看起来像 PI，但不是。如果您有一个额外的，或者如果您在一个之前有 BOM 以外的任何其他内容，这就是您将得到的错误。
【讨论】：
PI 是您的错误消息中的处理指令。 我刚刚发现，如果我在登录聊天者之前启动所有聊天窗口，那么我不会收到该错误。任何线索为什么？ Eric，你不要再要求我们从头调试你的程序，而是从底层开始理解它的行为。 这就是我的问题，我在 标签之前有一个导入。谢谢！【参考方案2】：我想通了。在创建每个新参与者后，我需要清除缓冲区。呃！！！
谢谢你的帮助！！
【讨论】：
【参考方案3】：对此的另一个答案是在 XML 中使用 XML 会破坏您不需要解析内部 XML 并使用 CDATA 标记，请参见此处：
http://www.w3schools.com/xml/xml_cdata.asp
即：
<?xml version='1.0'?>
<sometag>
<![CDATA[
<?xml version='1.0'?>
<nonParsedTag></nonParsedTag>
]]></sometag>
【讨论】：
【参考方案4】：我在 weblogic 上部署 spring webapp 时遇到了类似的问题。我们有第一行空白 在 xml 文件中。这会导致 XML 解析失败并出现此错误。删除后，它起作用了！希望它对其他人也有用.. :)
【讨论】：
【参考方案5】：在你的xml开始之前有不需要的内容可能是其他嘈杂的东西的空间：
<?xml version='1.0'?>
确保在您的 xml 开始之前没有任何内容。这将解决问题， 一个相关的例子是：
related reference
【讨论】：
【参考方案6】：我遇到了同样的问题，我解决了如下。
以下代码导致错误。
<?xml version="1.0" encoding="UTF-8"?>
所以，我只是在 ?> 之前放了一个空格。
<?xml version="1.0" encoding="UTF-8" ?>
在我这样做之后，就没有更多的错误了。
【讨论】：
【参考方案7】：实际上是因为不需要的内容，就我而言，这是因为我以后总是使用 cmets 来理解代码，所以我在 <?xml version='1.0'? 之前使用了带有 <!-- --> 的 cmets>
所以只需将 cmets 放在这一行之后，问题就解决了！
【讨论】：
【参考方案8】：我最近正在研究一个 Spring MVC 启动项目示例，其中我使用了 maven 构建工具。当我使用码头运行我的服务器时，我得到了这个处理指令错误，我发现我的web.xml 在<xml> 标记之前有一个额外的标记，它以<DOCTYPE> 标记开始。
所以我删除了下面的标签，它是开始标签，
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd" >
并且有下面的标签，
<?xml version="1.0" encoding="UTF-8"?>
作为我的web.xml 的开始标签，它解决了我的问题。
注意：请确保<?xml ...?> 标记之前没有任何 cmets、标签、空闲空格或任何不需要的字符。这主要会在解析xml文件时抛出这些类型的错误。
【讨论】：
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