java中HttpURLConnection的addRequestProperty和setRequestProperty
原创java中HttpURLConnection的addRequestProperty和setRequestProperty
原创
IT工作者
发布于 2022-05-09 14:25:44
发布于 2022-05-09 14:25:44
文章被收录于专栏：程序技术知识
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());
}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());
}输出结果：
name=[asad]
Address=[Delhi 17]
class=[10th]
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());
}输出结果
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());
}
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。
原创声明：本文系作者授权腾讯云开发者社区发表，未经许可，不得转载。
如有侵权，请联系 cloudcommunity@tencent.com 删除。
原创声明：本文系作者授权腾讯云开发者社区发表，未经许可，不得转载。
如有侵权，请联系 cloudcommunity@tencent.com 删除。
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