java我在第一次运行中创建的属性文件在第二次运行中被屏蔽

好的,我正在尝试为Minecraft创建一个自定义客户端(不用担心,我的问题与Minecraft无关),并且我添加了一个抽象类来使用Java的内置Properties系统管理配置文件.我有一种方法可以加载属性文件或在不存在的情况下创建它.在我所有其他方法的开头都调用了此方法(尽管它仅在第一次调用时才执行任何操作).

第一次运行Minecraft时,可以很好地创建属性文件,但是第二次运行时,由于某种原因,该文件被清空了.我不确定在哪里,为什么或如何将文件擦干净,有人可以帮我吗？这是我的代码；令人讨厌的方法是loadConfig()：

package net.minecraft.src;
import java.util.*;
import java.util.regex.*;
import java.io.*;
/**
* Class for managing my custom client's properties
*
* @author oxguy3
*/
public abstract class OxProps
{
public static boolean cOnfigloaded= false;
private static Properties props = new Properties();
private static String[] usernames;
public static void loadConfig() {
System.out.println("loadConfig() called");
if (!configloaded) {
System.out.println("loading config for the first time");
File cfile = new File("oxconfig.properties");
boolean configisnew;
if (!cfile.exists()) {
System.out.println("cfile failed exists(), creating blank file");
try {
cOnfigisnew= cfile.createNewFile();
} catch (IOException e) {
e.printStackTrace();
cOnfigisnew=true;
}
} else {
System.out.println("cfile passed exists(), proceding");
cOnfigisnew=false;
}
FileInputStream cin = null;
FileOutputStream cout = null;
try {
cin = new FileInputStream(cfile);
cout = new FileOutputStream(cfile);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
if (!configisnew) { //if the config already existed
System.out.println("config already existed");
try {
props.load(cin);
} catch (IOException e) {
e.printStackTrace();
}
} else { //if it doesn't exist, and therefore needs to be created
System.out.println("creating new config");
props.setProperty("names", "oxguy3, Player");
props.setProperty("cloak_url", "http://s3.amazonaws.com/MinecraftCloaks/akronman1.png");
try {
props.store(cout, "OXGUY3'S CUSTOM CLIENT\n\ncloak_url is the URL to get custom cloaks from\nnames are the usernames to give cloaks to\n");
cout.flush();
} catch (IOException e) {
e.printStackTrace();
}
}
String names = props.getProperty("names");
System.out.println("names: "+names);
try {
usernames = Pattern.compile(", ").split(names);
} catch (NullPointerException npe) {
npe.printStackTrace();
}
System.out.println("usernames: "+Arrays.toString(usernames));
cOnfigloaded=true;
}
}
public static boolean checkUsername(String username) {
loadConfig();
System.out.println("Checking username...");
for (int i=0; i System.out.println("comparing "+username+" with config value "+usernames[i]);
if (username.startsWith(usernames[i])){
System.out.println("we got a match!");
return true;
}
}
System.out.println("no match found");
return false;
}
public static String getCloakUrl() {
loadConfig();
return props.getProperty("cloak_url", "http://s3.amazonaws.com/MinecraftCloaks/akronman1.png");
}
}


如果太难读了,也可以在Pastebin上找到：http://pastebin.com/9UscXWap

谢谢！

解决方法:

您无条件创建新的FileOutputStream(cfile).这将用一个空文件覆盖现有文件.编写新的配置文件时,仅应调用FileOutputStream构造函数.

if (configloaded)
return;
File cfile = new File("oxconfig.properties");
try {
if (cfile.createNewFile()) {
try {
FileOutputStream cout = new FileOutputStream(cfile);
props.setProperty("names", "oxguy3, Player");
props.setProperty("cloak_url", "http://...");
...
cout.flush();
} finally {
cout.close();
}
} else {
FileInputStream cin = new FileInputStream(cfile);
try {
props.load(cin);
} finally {
cin.close();
}
}
cOnfigloaded=true;
} catch(IOException ex) {
e.printStackTrace();
}