JAVA requests库发送get/post请求基础
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内容图文
1.get
package jiekou_test_test2;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.*;
public class juhewether_get {
public static void main(String[] args) {
// TODO Auto-generated method stub
// set fillder proxy
System.setProperty("http.proxySet", "true");
System.setProperty("http.proxyHost", "127.0.0.1");
System.setProperty("http.proxyPort", "8888");
String lon = "116";
String lat = "39";
String key = "bf74bdf2807069fd35a82e3aa19445d5";
String url = "http://v.juhe.cn/weather/geo"+"?"+"lon="+lon+"&"+"lat="+lat+"&"+"key="+key;
try {
URL juhe_wether_get_url = new URL(url);
HttpURLConnection openConnection = (HttpURLConnection)juhe_wether_get_url.openConnection();
openConnection.connect();
InputStream is = openConnection.getInputStream();
InputStreamReader ir = new InputStreamReader(is, "utf-8");
BufferedReader br = new BufferedReader(ir);
StringBuffer sb = new StringBuffer();
String temp = "";
while((temp = br.readLine()) != null) {
sb.append(temp);
}
String result = sb.toString();
System.out.print(result);
}catch(Exception e){
}finally {
}
}
}
2.POST
package jiekou_test_test2;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.*;
public class juhewether_post {
public static void main(String[] args) {
// TODO Auto-generated method stub
//set fiddler proxy
System.setProperty("http.proxySet", "true");
System.setProperty("http.proxyHost", "127.0.0.1");
System.setProperty("http.proxyPort", "8888");
String lon = "116";
String lat = "39";
String key = "bf74bdf2807069fd35a82e3aa19445d5";
String url = "http://v.juhe.cn/weather/geo";
//create a url
URL post_url = null;
HttpURLConnection openConnection = null;
try {
post_url = new URL(url);
// open collection
openConnection = (HttpURLConnection)post_url.openConnection();
// set request method
openConnection.setRequestMethod("POST");
// set headers
openConnection.addRequestProperty("Content-Type", "application/x-www-form-urlencoded");
// preapare data
String data = "lon="+lon+"&"+"lat="+lat+"&"+"key="+key;
// open write os
openConnection.setDoOutput(true);
//write data
OutputStream os = openConnection.getOutputStream();
os.write(data.getBytes());
if(openConnection.getResponseCode() == 200) {
// read inputstream
InputStream is = openConnection.getInputStream();
InputStreamReader isr = new InputStreamReader(is, "UTF-8");
BufferedReader br = new BufferedReader(isr);
//strore result
StringBuffer sb = new StringBuffer();
String temp = "";
while((temp=br.readLine()) != null) {
sb.append(temp);
}
String result = sb.toString();
System.out.print(result);
}else {
System.out.print("status code is not 200!");
}
}
}catch(Exception e) {
e.printStackTrace();
System.out.print("exception occurs");
}finally{
if(openConnection != null) {
openConnection.disconnect();
}
}
}
3.记忆点
1.需要知道request的面向对象的设计思想，记住需要使用的类:
reqeust包:
URL
HttpURLConnection
IO流
2.真正发送请求的时机是 httpURLConnection.getInputStream方法的调用(通过fiddler抓包证实）
3.httpURLConnection.connect()方法不需要显示地调用，它的作用是建立tcp连接，如果不显示的调用，从connection获取输入流的时候也会先建立连接。
它更多的作用是区别设置request和获取response的时机。
4.参考博文：https://www.cnblogs.com/skys-li/p/6121044.html
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