GET:内部实现是组拼Url的方式,http协议规定最大长度4kb,ie浏览器限制1kb
POST和GET的区别比较了一下,多了几条信息
Content-Type:application/x-www-form-urlencoded
Content-Length:93
主体内容
只需修改上一节代码中的几个地方:
调用HttpURLConnection对象的setRequestMethod(“POST”)方法
调用HttpURLConnection对象的setRequestProperty()方法,把上面的几条头信息加进去
拼接好内容比如 String data=”username=”+username,调用String对象的length()方法,返回长度,长度+””空字符串转成String类型
调用HttpURLConnection对象的setDoOutput(true)方法,是否允许写数据
调用HttpURLConnection对象的getOutputStream()方法,获取OutputStream对象
调用OutputStream对象的write(buffer)方法,向服务器写数据,参数:buffer是byte[]数组,调用String对象的getBytes()方法,得到byte[]
service:
/**
* POST传递参数
*
* @param username
* @param password
* @return
*/
public static String loginByPost(String username, String password) {
String path = ROOT_PATH;
try {
URL url = new URL(path);
String data="username="+username+"&password="+password;
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setConnectTimeout(5000);
//设置头信息
conn.setRequestMethod("POST");
conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
conn.setRequestProperty("Content-Length", data.length()+"");
//写数据
conn.setDoOutput(true);
OutputStream os=conn.getOutputStream();
os.write(data.getBytes());
int code = conn.getResponseCode();
if (code == 200) {
InputStream is = conn.getInputStream();
String info = StreamTools.readInputStream(is);
return info;
}
} catch (Exception e) {
e.printStackTrace();
}
return "请求失败";
}