Java对Properties文件操作小结

经常用到，Java对Properties文件操作，在这里做一个小结。
Java对Properties文件的操作可以说是“不尽人意”，这里时间关系大体先说一下，回头慢慢说。
1.java读Properties文件，经常能读出一些乱码。
2.java写Properties文件，用能把以前的Properties文件的注释弄丢了。

//读配置文件片段

public String getPropertyValue(String key){
  Properties pro = new Properties();
  try {
   InputStream in = new FileInputStream("");  //加载配置文件
   try {
    pro.load(in);
   } finally {
    in.close();
   }
   return pro.getProperty(key);
  } catch (Exception e) {
   e.printStackTrace();

   return null;
  }

}

//写配置文件片段

public void setPropertyValue(String key, String value){
  Properties pro = new Properties();
  try {
   InputStream in = new FileInputStream("");   //加载配置文件
   try {
    pro.load(in);
   } finally {
    in.close();
   }

   pro.setProperty(key, value);

   OutputStream out =new FileOutputStream("");   //加载配置文件
   try{
    pro.store(out, "modi by lmy");
    out.flush();
   }finally{
    out.close();
   }

  } catch (Exception e) {
   e.printStackTrace();
  }
}

上面的[b]public String getPropertyValue(String key)[/b]是不存在什么问题的，因为毕竟就是一个读取操作，但是[b]public void setPropertyValue(String key, String value)[/b]会出现很严重的问题，因为它会把你文件中所有的注释都忽略掉，你保存文件后发现所有的注释都没有了，解决这个问题我找了好多资料，没有什么好办法。最好利用了一个笨办法，就是写入操作不用Properties类机型操作，而是直接利用文件写入，逐行读入文件，然后后利用key来替换key对应的value。

这里给大家一个完整的代码，大体方法如此，具体的方法大家手动根据自己的需要去改吧。

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Properties;

import javax.swing.table.TableModel;

import com.peraglobal.core.AnalyserMap;

public class PropertyTool {

	private static Object[][] content;

	public final static void setProperty(Properties pro) {

		List<String> keys = new ArrayList<String>();
		List<String> values = new ArrayList<String>();
		content = null;

		Iterator<Map.Entry<Object, Object>> it = pro.entrySet().iterator();
		String tempValue = "";
		Object key;
		Object value;
		while (it.hasNext()) {
			Map.Entry<Object, Object> entry = (Map.Entry<Object, Object>) it
					.next();
			// Object key = entry.getKey();
			key = entry.getKey();
			value = entry.getValue();
			keys.add(String.valueOf(key));
			try {
				tempValue = new String(String.valueOf(value).getBytes(
						"iso-8859-1"), "utf-8");
			} catch (UnsupportedEncodingException e) {
				e.printStackTrace();
			}
			values.add(tempValue);
		}

		content = new Object[keys.size()][2];
		for (int i = 0; i < keys.size(); i++) {
			content[i][0] = keys.get(i);
			content[i][1] = values.get(i);
		}
	}

	public final static List<String> getProperties(String filePath) {
		try {
			// 加载配置文件
			List<String> propCont = new ArrayList<String>();
			FileInputStream fis = new FileInputStream(filePath);
			InputStreamReader isr = new InputStreamReader(fis, "utf-8");
			BufferedReader bufferedreader = new BufferedReader(isr);
			String temp = "";
			while ((temp = bufferedreader.readLine()) != null) {
				propCont.add(temp);
			}
			bufferedreader.close();
			isr.close();
			fis.close();

			return propCont;

		} catch (Exception e) {
			e.printStackTrace();
			return null;
		}
	}

	public final static void saveProperties(String filePath,
			List<String> content, TableModel tableValues) {
		try {
			// 加载配置文件
			FileReader file = new FileReader(filePath);
			List<String> propCont = new ArrayList<String>();
			BufferedReader bufferedreader = new BufferedReader(
					new InputStreamReader(new FileInputStream(filePath),
							"utf-8"));
			String temp = "";
			while ((temp = bufferedreader.readLine()) != null) {
				propCont.add(temp);
			}

			propCont = tableValutToList(propCont, tableValues);

			bufferedreader.close();
			file.close();

			BufferedWriter br = null;
			OutputStream outsm = new FileOutputStream(filePath);
			OutputStreamWriter outFileWriter = new OutputStreamWriter(outsm,
					"utf-8");
			br = new BufferedWriter(outFileWriter);

			br.write(listToString(propCont));
			br.flush();
			outFileWriter.flush();
			outsm.flush();

			br.close();
			outFileWriter.close();
			outsm.close();

		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	public static final List<String> tableValutToList(List<String> content,
			TableModel tableValues) {
		String keyCell;
		String valueCell;
		String rowContent;
		String[] cellContents;
		String newContent;
		// 以原始的文档为依据开始遍历。
		for (int i = 0; i < content.size(); i++) {
			rowContent = content.get(i);
			// 遍历修改后的数据
			for (int j = 0; j < tableValues.getRowCount(); j++) {
				keyCell = String.valueOf(tableValues.getValueAt(j, 1));
				valueCell = String.valueOf(tableValues.getValueAt(j, 3));
				// 找到原始文件相应的值，并覆盖。
				if (0 <= rowContent.indexOf(keyCell)) {
					cellContents = rowContent.split("=");
					// 判断是否合法，不合法则跳出循环（可能需要更严格的判断，来判断是否是注释等）。
					if (0 < cellContents.length
							&& !cellContents[0].startsWith("#")
							&& keyCell.trim().toLowerCase().equals(cellContents[0].trim().toLowerCase())) {
						newContent = cellContents[0] + "=" + valueCell;
						content.set(i, newContent);
					}
				}
			}
		}
		return content;
	}

	public static final String listToString(List<String> list) {
		String str = "";
		for (int i = 0; i < list.size(); i++) {
			str = str + list.get(i) + "\n";
		}
		return str;
	}

	/**
	 * 读取配置文件字段。
	 * 
	 * @throws Exception
	 * */
	public final static Object[][] loadProperty(String filePath,
			AnalyserMap analyserMap) throws Exception {
		Properties pro = new Properties();

		File curFile = new File(filePath);
		if (!curFile.exists()) {
			throw new Exception("文件不存在");
		}
		// 加载配置文件
		InputStream in = new FileInputStream(filePath);
		try {
			pro.load(in);
		} finally {
			in.close();
		}

		PropertyTool.setProperty(pro);
		Object[][] content = PropertyTool.getProperties();

		Object[] temptt;
		List<Object[]> contentList = new ArrayList<Object[]>();
		String key;
		String value;
		for (int i = 0; i < content.length; i++) {
			key = String.valueOf(content[i][0]);
			value = String.valueOf(content[i][1]);

			if (!analyserMap.isVisible(key)) {
				continue;
			}

			temptt = new Object[4];
			temptt[0] = (i + 1) + "";
			temptt[1] = key;
			temptt[2] = analyserMap.getCaption(key);
			temptt[3] = value;

			contentList.add(temptt);
		}

		Object[][] reContent = new Object[contentList.size()][];
		for (int i = 0; i < reContent.length; i++) {
			temptt = contentList.get(i);
			reContent[i] = temptt;
			reContent[i][0] = i + 1 + "";

		}

		return reContent;
	}

	/**
	 * 读取配置文件字段。
	 * 
	 * @throws Exception
	 * */
	public final static Object[][] loadProperty(String filePath)
			throws Exception {
		Properties pro = new Properties();

		File curFile = new File(filePath);
		if (!curFile.exists()) {
			throw new Exception("文件不存在");
		}
		// 加载配置文件
		InputStream in = new FileInputStream(filePath);
		try {
			pro.load(in);
		} finally {
			in.close();
		}

		PropertyTool.setProperty(pro);
		Object[][] content = PropertyTool.getProperties();

		Object[] temptt;
		List<Object[]> contentList = new ArrayList<Object[]>();
		String key;
		String value;
		for (int i = 0; i < content.length; i++) {
			key = String.valueOf(content[i][0]);
			value = String.valueOf(content[i][1]);

			temptt = new Object[2];
			temptt[0] = key;
			temptt[1] = value;

			contentList.add(temptt);
		}

		Object[][] reContent = new Object[contentList.size()][];
		for (int i = 0; i < reContent.length; i++) {
			temptt = contentList.get(i);
			reContent[i] = temptt;
		}

		return reContent;
	}

	public final static Object[][] getProperties() {
		return content;
	}
}