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【Java】文件读取，字符串替换。

作者:falcon7758 / 发布于2011/9/18/ 752

需求：每生成一个订单，给相应的用户发一条短信。短信模板存放在txt文件。模板以${mobile} 之类的作为占位符

<div>public class MyUtil {
private static final Logger log = Logger.getLogger(MyFileUtil.class);
private static final String TEMPLATE = "/msgTemplate.txt";
private static long lastCheck = -1L;
private static long lastModified = -1L;
private static final long CHECK_INTERVAL = 180000; // 3分钟检查一次
private static StringBuffer context = new StringBuffer();</div>
<div>//模板文件读取
public static String getTemplate() throws IOException{
long ct = System.currentTimeMillis();
if ((ct - lastCheck) > CHECK_INTERVAL) {
File tmpFile = new File(TEMPLATE);
if (tmpFile.lastModified() > lastModified) {
synchronized (MyFileUtil.class) {
String tmp = null;
BufferedReader breader = null;
try {
breader = new BufferedReader(
new InputStreamReader(new FileInputStream(tmpFile)));
while ((tmp = breader.readLine()) != null) {
context.append(tmp);
}
} finally{
breader.close();
}
lastModified = tmpFile.lastModified();
}
}
lastCheck = ct;
}
return context.toString();
}
<div>//模板内容替换
public String getMsgByTemplate(Object obj) throws IOException, SecurityException, NoSuchFieldException, IllegalArgumentException, IllegalAccessException{
Class<?> clazz = obj.getClass();
String context = MyFileUtil.getTemplate();//得到模板内容
Set<String> set = new HashSet<String>();

int i = 0;
while(i<context.length()){
int index = context.indexOf("${",i);
int end = context.indexOf("}", index);
if(index==-1) break;//找不到以${开头 中止循环
set.add(context.substring(index+2, end).trim());//取得${mobile} 的 'mobile' 字符串
}

Map<String,String> map = new HashMap<String,String>();
Iterator<String> iterator = set.iterator();
while(iterator.hasNext()){
String tmp = iterator.next();
Field field = clazz.getDeclaredField(tmp);
field.setAccessible(true);
String value = field.get(obj).toString();
map.put(tmp, value);//如map.put("mobile","13560023645");
}

for(Map.Entry<String, String> entry:map.entrySet()){
//替换模板中的类似${mobile}的占位符 为真正的字符.。
context = context.replaceAll("<a href="file://\\$\\{"+entry.getKey()+"\\">\\$\\{"+entry.getKey()+"\\</a>}", entry.getValue());
}

return context;
}
}

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