遍历Map

for (Map.Entry<String, String> entry : params.entrySet()) {
                // System.out.println(entry.getKey()+","+ entry.getValue());
                conn.setRequestProperty(entry.getKey(), entry.getValue());
}

方法1：


  Map map = new HashMap();
  map.put("a", "1");
  map.put("b", "2");
  map.put("c", "3");
  map.put("d", "4");
  map.put("e", "5");
  for (Iterator iter = map.keySet().iterator(); iter.hasNext();) {
      Object key = iter.next();
      Object val = map.get(key);
      System.out.println("key:"+key);
      System.out.println("value:"+val);
  }



方法2：

  Map map = new HashMap();
  map.put("a", "1");
  map.put("b", "2");
  map.put("c", "3");
  map.put("d", "4");
  map.put("e", "5");
  for (Iterator iter = map.entrySet().iterator(); iter.hasNext();) {
      Map.Entry entry = (Map.Entry) iter.next();
      Object key = entry.getKey();
      Object val = entry.getValue();
      System.out.println("key:"+key);
      System.out.println("value:"+val);
  }