JAVA代碼模擬獲取cookie以及攜帶cookie
去年做android的時(shí)候涛癌，網(wǎng)絡(luò)連接沒有用類似OKHttp之類的框架送火，而是完全用jdk自帶的api實(shí)現(xiàn)，今天不想看書弃衍。镜盯。就把筆記整理一下吧猖败。。
這里有個(gè)小demo艺糜，是先實(shí)現(xiàn)登陸破停，登陸的過程是通過post方式請(qǐng)求尉剩，登陸后通過攜帶的cookie判斷是否已經(jīng)成功登陸边涕。
1.獲取cookie
public void connect(String u) throws IOException{
HttpURLConnection conn = null;
OutputStream os = null;
InputStream is = null;
try {
URL url = new URL(u);
conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("POST");
conn.setDoInput(true);
conn.setDoOutput(true);
os = conn.getOutputStream();
String param = "account=senninha&password=senninha";
String eparam = param;
//這里是把post參數(shù)攜帶上去。
os.write(eparam.getBytes("utf-8"));
is = conn.getInputStream();
byte[] b = new byte[1024];
int len = is.read(b);
while(len != -1){
System.out.println(new String(b,0,len,"utf-8"));
len = is.read(b);
}
//這里是讀取第一次登陸時(shí)服務(wù)器返回的cookie宠蚂，然后用一個(gè)全局變量cookie接收。因?yàn)槭欠?wù)器往客戶端發(fā)送cookie求厕，所以名字是Set-Cookie
cookie = conn.getHeaderField("Set-Cookie");
System.out.println("read over" + cookie);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally{
if(os != null){
os.close();
}
if(is != null){
is.close();
}
if(conn != null){
conn.disconnect();
}
System.out.println("all close");
}
}
2.攜帶cookie
public void isLogin(String u) throws IOException{
HttpURLConnection conn = null;
InputStream is = null;
try {
URL url = new URL(u);
conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("POST");
//把上一步獲取的cookie攜帶上去
conn.setRequestProperty("cookie", cookie);
conn.setDoInput(true);
is = conn.getInputStream();
byte[] b = new byte[1024];
int len = is.read(b);
while(len != -1){
System.out.println(new String(b,0,len,"utf-8"));
len = is.read(b);
}
System.out.println("read over");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally{
if(is != null){
is.close();
}
if(conn != null){
conn.disconnect();
}
}
System.out.println("all close");
}
ok，以后每次訪問弦赖，只要攜帶上這個(gè)cookie蹬竖，就可以暢通無阻了。當(dāng)然列另，是指用cookie維持登陸的網(wǎng)站页衙。
ps：java后端的維持登陸狀態(tài)的cookie叫JSESSIONID店乐，php的叫phpSessionId好像响巢。踪古。
ps：對(duì)于安卓客戶端來說券腔，獲取到的cookie可以存到數(shù)據(jù)庫里，這樣重啟app后一樣可以再次保持登陸狀態(tài)纷纫。
