读取.properties的内容，并将内容放入一个Map中

1. sql.properties

select_emp_by_id = select * from emp where empno = ?
select_emp_by_name = select * from emp where ename = ?

 

 

 

2. Constants.java

import java.util.HashMap;
import java.util.Map;

/**
 * @ClassName: Constants
 * @Description: 常量类
 * @author 
 * @date 2011-12-28
 * @version V1.0
 */
public final class Constants {

	private Constants() {
	}

	public static Map loadSqlMap = new HashMap(
			16);
	
	
}

 

3. 读取资源文件类

import java.io.IOException;
import java.io.InputStream;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Properties;
import java.util.Set;

/**
 * @ClassName: LoadPopertiesFile
 * @Description: TODO
 * @author
 * @date 2011-12-28
 * @version V1.0
 */
public final class LoadPopertiesFile {

	private LoadPopertiesFile() {
	}

	/**
	 * @Title: loadSqlFile
	 * @Description: 加载sql.properties文件,并获取其中的内容(key-value)
	 * @param filePath
	 *            : 文件路径
	 * @author 
	 * @date 2011-12-28
	 */
	public static void loadSqlFile(String filePath) {

		if (null == filePath || "".equals(filePath.trim())) {
			System.out.println("The file path is null,return");
			return;
		}

		filePath = filePath.trim();

		// 获取资源文件
		InputStream is = LoadPopertiesFile.class.getClassLoader()
				.getResourceAsStream(filePath);

		// 属性列表
		Properties prop = new Properties();

		try {
			// 从输入流中读取属性列表
			prop.load(is);
		} catch (IOException e) {
			System.out.println("load file faile." + e);
			return;
		} catch (Exception e) {
			System.out.println("load file faile." + e);
			return;
		}

		// 返回Properties中包含的key-value的Set视图
		Set> set = prop.entrySet();
		// 返回在此Set中的元素上进行迭代的迭代器
		Iterator> it = set.iterator();
		String key = null, value = null;
		// 循环取出key-value
		while (it.hasNext()) {

			Entry entry = it.next();

			key = String.valueOf(entry.getKey());
			value = String.valueOf(entry.getValue());

			key = key == null ? key : key.trim().toUpperCase();
			value = value == null ? value : value.trim().toUpperCase();
			// 将key-value放入map中
			Constants.loadSqlMap.put(key, value);
		}
	}
}

  

 

 4. 测试 Junit4

@Test
	public void loadSqlFile() {
		String filePath = "sql.properties";		
		LoadPopertiesFile.loadSqlFile(filePath);		
		String sql = Constants.loadSqlMap.get("select_emp_by_id".toUpperCase());
		System.out.println("sql=" + sql);
	}

 

5. 测试结果

sql=SELECT * FROM EMP WHERE EMPNO = ?