public void getPhoneAttribution(String cityname) {
try{
BufferedWriter bw = new BufferedWriter(new FileWriter("cityregion.data",true));
String cityName1=cityname+"区";
String cityName2=cityname+"市";
if (telMap.containsValue(cityName1)) {
bw.write("\n"+cityName1+" ");
bw.write(telMap.get(cityName1));
}else{
if (telMap.containsValue(cityName2)) {
bw.write("\n"+cityName2+" ");
bw.write(telMap.get(cityName2));
}else {
System.out.println("the city's region is null!");
}
} 

bw.flush();
bw.close();
}catch(Exception e){
e.printStackTrace();
}


}

------解决方案--------------------
Java code

        //讀出1.txt中的內容
        BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream("c:\\1.txt"), "BIG5"));
        Map<String, String> fa = new HashMap<String, String>();
        String temp = null;
        while ((temp = br.readLine()) != null) {
            fa.put(temp.split(" ")[0], temp.split(" ")[1]);
        }
        br.close();

        //讀出2.txt中的內容與fa中的內容進行匹配
        BufferedReader br1 = new BufferedReader(new InputStreamReader(new FileInputStream("c:\\2.txt"), "BIG5"));
        Map<String, String> fa1 = new HashMap<String, String>();
        String temp1 = null;
        while ((temp1 = br1.readLine()) != null) {
            for (Iterator<Entry<String, String>> it = fa.entrySet().iterator(); it.hasNext();) {
                Entry<String, String> e = it.next();

                if (e.getValue().matches(".*" + temp1 + ".*")) {
                    fa1.put(e.getKey(), temp1);
                }
            }
        }
        br1.close();

        //寫到新文件
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream("c:\\3.txt"), "BIG5"));
        for (Iterator<Entry<String, String>> it = fa1.entrySet().iterator(); it.hasNext();) {
            Entry<String, String> e = it.next();
            bw.write(e.getKey() + " " + e.getValue() + " \r\n");
        }
        bw.flush();
        bw.close();