问题的提出:初用properties,读取java properties文件的时候如果value是中文,会出现读取乱码的问题
问题分析:开始以为是文件保存编码问题,把eclipse中所有的文件编码都修改成utf8,问题依然存在;把内容复制到notepad++进行utf8编码转换,问题依旧;上网搜索有人提议重写properties类或者用jdk自带的编码转换工具,嫌麻烦而且凭感觉jdk开发者不可能不考虑东亚几国的字符编码问题;因为properties文件操作的代码是参考百度文库里的一边文章的,分析其代码后,发现其用的是字节流来读取文件,具体代码如下:
Properties properties = new Properties();
InputStream inputStream = this.getClass().getResourceAsStream("/menu.properties");
properties.load(inputStream );
System.out.println(properties.getProperty("a"));
因为字节流是无法读取中文的,所以采取reader把inputStream转换成reader用字符流来读取中文。代码如下:
Properties properties = new Properties();
InputStream inputStream = this.getClass().getResourceAsStream("/menu.properties");
BufferedReader bf = new BufferedReader(new InputStreamReader(inputStream));
properties.load(bf);
System.out.println(properties.getProperty("a"));
代码示例:
1、工具类
/**
* 读取配置文件Properties
*
* @author xl
*
*/
public class PropertiesUtil {
private PropertiesUtil() {
}
private static class SingletonHolder {
private final static PropertiesUtil instance = new PropertiesUtil();
}
public static PropertiesUtil getInstance() {
return SingletonHolder.instance;
}
/**
* 读取key字段,配置文件在classes根路径下xx.properties,在子路径下xx/xx.properties
*
* @param file
* @param key
* @return
*/
public String read(String file, String key) {
InputStream in = getClass().getClassLoader().getResourceAsStream(file);
BufferedReader bf = new BufferedReader(new InputStreamReader(in));
Properties prop = new Properties();
String value = "";
try {
prop.load(bf);
value = prop.getProperty(key);
} catch (IOException e) {
e.printStackTrace();
}
return value;
}
}
2、使用工具类
/**
* 获取properties文件中存放的数据
*
* @param req
* @param resp
* @return
* @throws Exception
*/
@RequestMapping(value = "/getPropertiesData")
@ResponseBody
public Map<String, Object> getPropertiesData(HttpServletRequest req, HttpServletResponse resp) throws Exception {
Map<String, Object> returnMap = new HashMap<String, Object>();
// 获取请求参数
String key = (String) req.getParameter("key");
String file = (String) req.getParameter("file");
// 从配置文件读取key对应的value
String value = PropertiesUtil.getInstance().read(file, key);
returnMap.put("data", value);
// 解析返回结果
return returnMap;
}
完!!!