我们有一个Java程序，它从.xml文件中提取信息，将其转换为字符串，然后将该字符串写入.txt文件。然后将该文件附加到第二个.txt文件，该文件将保存来自多个.xml文件的所有输入。在Mac上的Eclipse中，程序正确地将所有.xml代码附加到最终的.txt文件中。
但是，当在Eclipse中的Windows计算机上运行相同的Java程序时，最终的.txt文件不会像在Mac上那样收集所有输入。在Windows与Mac上读取/写入文件是否存在已知差异？特别是当最初在Mac上编写的代码被转移到Windows机器上时？
这是我们的代码：
package edu.uci.ics.jung.samples;
import java.io.FileWriter;
import java.io.BufferedWriter;
import java.io.IOException;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;
import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.w3c.dom.Node;
import org.w3c.dom.Element;
import java.io.File;
import java.util.Scanner;
public class ReadXMLFile1 {
public static void main(String argv[]) throws IOException { //throws ioexception allows the filewriter code below (specifically writing the "t# b" title)
//while loop to grab all xml files in the form of name0, name1, name2, etc and perform txt file conversion
int numberofgraphs=10; //indicate number of graphs importing/reading/appending
int x=0;
int b = 0;
while (x < numberofgraphs){
FileWriter pagetowrite = new FileWriter("graphtotal1.txt", true); //true says to append string "scannedstuff" to graphtotal.txt (graphtotal.txt can be replaced by any file in visualization folder, you name it!)
BufferedWriter now = new BufferedWriter(pagetowrite); //more advanced file writer, included in order to use newLine() method below
now.write("t# "+b); //writes the title t# "b" at top of each graph set
now.newLine(); //returns to next line of file (helps keep format of original .txt)
now.close(); //ends file writing for that line of text file
try {
String xmlname = ("Untitled"+b+".xml");
File fXmlFile = new File(xmlname);
DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
Document doc = dBuilder.parse(fXmlFile);
doc.getDocumentElement().normalize();
NodeList oList = doc.getElementsByTagName("node"); //writing to txt file the node info
for (int temp = 0; temp < oList.getLength(); temp++) {
Node oNode = oList.item(temp);
if (oNode.getNodeType() == Node.ELEMENT_NODE) {
Element fElement = (Element) oNode;
String nodename = getTagValue("name", fElement);
char nodenumber = nodename.charAt( 1 );
String nodelabel = getTagValue("string", fElement);
FileWriter pagetowriteon = new FileWriter("newinput1.txt", true); //true says to append string "scannedstuff" to newinput1.txt (newinput1.txt can be replaced by any file in visualization folder, you name it!)
BufferedWriter out = new BufferedWriter(pagetowriteon); //more advanced file writer, included in order to use newLine() method below
out.write("v"+ " "); //writes the letter v to indicate a node
out.write(nodenumber+" "); //writes number of node created
out.write(nodelabel); // writes the name of node..its label
out.newLine(); //returns to next line of file (helps keep format of original .txt)
out.close(); //ends file writing for that line of text file
}
}
NodeList nList = doc.getElementsByTagName("arc");//writing to txt file the arc info
for (int temp = 0; temp < nList.getLength(); temp++) {
Node nNode = nList.item(temp);
if (nNode.getNodeType() == Node.ELEMENT_NODE) {
Element eElement = (Element) nNode;
//String arcname = getTagValue("name", eElement);
String arcnode1 = getTagValue("From", eElement);
char node1 = arcnode1.charAt( 1 );
String arcnode2 = getTagValue("To", eElement);
char node2 = arcnode2.charAt( 1 );
String arclabel = getTagValue("string", eElement);
FileWriter pagetowriteon = new FileWriter("newinput1.txt", true); //true says to append string "scannedstuff" to newinput1.txt (newinput1.txt can be replaced by any file in visualization folder, you name it!)
BufferedWriter out = new BufferedWriter(pagetowriteon); //more advanced file writer, included in order to use newLine() method below
out.write("u"+ " "); //writes the letter u to indicate an edge
out.write(node1+" ");
out.write(node2+ " ");
out.write(arclabel);
out.newLine(); //returns to next line of file (helps keep format of original .txt)
out.close(); //ends file writing for that line of text file
}
}
//an option (mostly for individual graph use with simplegraphview...probably unecessary since simplegraph not used until after Data mining) to write to a newly named textfile so can run simplegraph view without having to change file name
File file = new File("newinput1.txt");
//File (or directory) with new name (makes it easy to change one file name here instead of two in code above)
File file2 = new File("newinput.txt");
file.renameTo(file2);
//this strategy of appending-> keep-> allows you to change one file name for giant append file..Filewriter line below ("graphtotal.txt")
//start of appending text file
// boolean graphready;
//assign if(boolean){ = to true when ready to append
if (true){
File file3 = new File ("newinput.txt"); //indicate which file
Scanner scan = new Scanner (file3); //read the text file indicated above
while (scan.hasNextLine()){ //will loop until no more lines of code detected; this loop reads and appends text to desired file
String scannedstuff3 = scan.nextLine(); //converts next line of code to a string
FileWriter pagetowriteon = new FileWriter("graphtotal.txt", true); //true says to append string "scannedstuff" to graphtotal.txt (graphtotal.txt can be replaced by any file in visualization folder, you name it!)
BufferedWriter out = new BufferedWriter(pagetowriteon); //more advanced file writer, included in order to use newLine() method below
//out.write("t# "+b); //writes the title t3 0 at top of each graph set
//out.newLine(); //returns to next line of file (helps keep format of original .txt)
out.write(scannedstuff3); //writes scanned line of code to new file indicated in FileWriter("desiredfile.txt", true)
out.newLine(); //returns to next line of file (helps keep format of original .txt)
out.close(); //ends file writing for that line of text file
}
scan.close(); //ends scanning of txt file indicated
}
} catch (Exception e) {
e.printStackTrace();
}
x=x+1;
b=b+1;
}
}
private static String getTagValue(String sTag, Element eElement) {
NodeList nlList = eElement.getElementsByTagName(sTag).item(0).getChildNodes();
Node nValue = (Node) nlList.item(0);
return nValue.getNodeValue();
}
}
答案 0 :(得分：0)
看看刷新BufferedWriter。缓冲，因为它由底层操作系统控制，因平台而异。