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一、当只有addRequestProperty的时候
- URL url = new URL(“http://localhost:8080/net/listnets.jsp”);
- URLConnection connection = url.openConnection();
- connection.addRequestProperty(“name”, “asad”);
- connection.addRequestProperty(“name”, “komal”);
- connection.addRequestProperty(“class”, “10th”);
- connection.addRequestProperty(“Address”, “Delhi 17”);
- Map map = connection.getRequestProperties();
- Set set = map.entrySet();
- Iterator iterator = set.iterator();
- while (iterator.hasNext()) {
- System.out.println(iterator.next());
- }
URL url = new URL("http://localhost:8080/net/listnets.jsp");
URLConnection connection = url.openConnection();
connection.addRequestProperty("name", "asad");
connection.addRequestProperty("name", "komal");
connection.addRequestProperty("class", "10th");
connection.addRequestProperty("Address", "Delhi 17");
Map map = connection.getRequestProperties();
Set set = map.entrySet();
Iterator iterator = set.iterator();
while (iterator.hasNext()) {
System.out.println(iterator.next());
}- 输出结果：name=[komal, asad]
- Address=[Delhi 17]
- class=[10th]
输出结果：name=[komal, asad]
Address=[Delhi 17]
class=[10th]二、当只有setRequestProperty的时候
- URL url = new URL(“http://localhost:8080/net/listnets.jsp”);
- URLConnection connection = url.openConnection();
- connection.setRequestProperty(“name”, “komal”);
- connection.setRequestProperty(“name”, “asad”);
- connection.setRequestProperty(“class”, “10th”);
- connection.setRequestProperty(“Address”, “Delhi 17”);
- Map map = connection.getRequestProperties();
- Set set = map.entrySet();
- Iterator iterator = set.iterator();
- while (iterator.hasNext()) {
- System.out.println(iterator.next());
- }
URL url = new URL("http://localhost:8080/net/listnets.jsp");
URLConnection connection = url.openConnection();
connection.setRequestProperty("name", "komal");
connection.setRequestProperty("name", "asad");
connection.setRequestProperty("class", "10th");
connection.setRequestProperty("Address", "Delhi 17");
Map map = connection.getRequestProperties();
Set set = map.entrySet();
Iterator iterator = set.iterator();
while (iterator.hasNext()) {
System.out.println(iterator.next());
}- 输出结果：
输出结果：- name=[asad]
- Address=[Delhi 17]
- class=[10th]
name=[asad]
Address=[Delhi 17]
class=[10th]- 注意name的设置，会发生覆盖的作用。
注意name的设置，会发生覆盖的作用。三、当先set后add的时候
- URL url = new URL(“http://localhost:8080/net/listnets.jsp”);
- URLConnection connection = url.openConnection();
- connection.setRequestProperty(“name”, “asad”);
- connection.addRequestProperty(“name”, “komal”);
- connection.addRequestProperty(“class”, “10th”);
- connection.addRequestProperty(“Address”, “Delhi 17”);
- Map map = connection.getRequestProperties();
- Set set = map.entrySet();
- Iterator iterator = set.iterator();
- while (iterator.hasNext()) {
- System.out.println(iterator.next());
- }
URL url = new URL("http://localhost:8080/net/listnets.jsp");
URLConnection connection = url.openConnection();
connection.setRequestProperty("name", "asad");
connection.addRequestProperty("name", "komal");
connection.addRequestProperty("class", "10th");
connection.addRequestProperty("Address", "Delhi 17");
Map map = connection.getRequestProperties();
Set set = map.entrySet();
Iterator iterator = set.iterator();
while (iterator.hasNext()) {
System.out.println(iterator.next());
}- 输出结果
输出结果- name=[komal, asad]
- Address=[Delhi 17]
- class=[10th]
name=[komal, asad]
Address=[Delhi 17]
class=[10th] 四、当先add后set的时候
- URL url = new URL(“http://localhost:8080/net/listnets.jsp”);
- URLConnection connection = url.openConnection();
- connection.addRequestProperty(“name”, “komal”);
- connection.setRequestProperty(“name”, “asad”);
- connection.addRequestProperty(“class”, “10th”);
- connection.addRequestProperty(“Address”, “Delhi 17”);
- Map map = connection.getRequestProperties();
- Set set = map.entrySet();
- Iterator iterator = set.iterator();
- while (iterator.hasNext()) {
- System.out.println(iterator.next());
- }
URL url = new URL("http://localhost:8080/net/listnets.jsp");
URLConnection connection = url.openConnection();
connection.addRequestProperty("name", "komal");
connection.setRequestProperty("name", "asad");
connection.addRequestProperty("class", "10th");
connection.addRequestProperty("Address", "Delhi 17");
Map map = connection.getRequestProperties();
Set set = map.entrySet();
Iterator iterator = set.iterator();
while (iterator.hasNext()) {
System.out.println(iterator.next());
}
- name=[asad]
- Address=[Delhi 17]
- class=[10th]
name=[asad]
Address=[Delhi 17]
class=[10th]五、结
setRequestProperty方法，如果key存在，则覆盖；不存在，直接添加。
addRequestProperty方法，不管key存在不存在，直接添加。
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