setrequestproperty参数_HttpURLConnection的addRequestProperty和setRequestProperty「建议收藏」

大家好，又见面了，我是你们的朋友全栈君。

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。

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