HttpURLConnection连接代码基本详…

来源：互联网发布：不出门知天下事编辑：程序博客网时间：2024/05/22 07:00

这篇文章是从别的地方看到的，挺不错的，就学习一下吧

package com.service;

import java.io.BufferedReader;

import java.io.DataOutputStream;

import java.io.IOException;

import java.io.InputStreamReader;

import java.net.HttpURLConnection;

import java.net.URL;

import java.net.URLEncoder;

public class HttpInvoker {

public static final String GET_URL = "http://localhost:8080/demo/ ";

public static final String POST_URL = "http://localhost:8080/demo/ ";

public static void readContentFromGet() throwsIOException {

//拼凑get请求的URL字串，使用URLEncoder.encode对特殊和不可见字符进行编码

String getURL = GET_URL + "?username= "

+ URLEncoder.encode("fat man", " utf-8");

URL getUrl = newURL(getURL);

//根据拼凑的URL，打开连接，URL.openConnection()函数会根据URL的类型，返回不同的URLConnection子类的对象，在这里我们的URL是一个http，因此它实际上返回的是HttpURLConnection

HttpURLConnection connection =(HttpURLConnection)getUrl.openConnection();

//建立与服务器的连接，并未发送数据

connection.connect();

//发送数据到服务器并使用Reader读取返回的数据

BufferedReader reader = newBufferedReader(newInputStreamReader(connection.getInputStream()));

System.out.println("============================= ");

System.out.println(" Contentsof get request ");

System.out.println("============================= ");

Stringlines;

while ((lines =reader.readLine()) != null) {

System.out.println(lines);

}

reader.close();

//断开连接

connection.disconnect();

System.out.println("============================= ");

System.out.println(" Contentsof get request ends ");

System.out.println("============================= ");

}

public static void readContentFromPost() throwsIOException {

//Post请求的url，与get不同的是不需要带参数

URL postUrl = newURL(POST_URL);

//打开连接

HttpURLConnection connection =(HttpURLConnection)postUrl.openConnection();

//打开读写属性，默认均为false

connection.setDoOutput(true);

　　　　　　　 connection.setDoInput(true);

//设置请求方式，默认为GET

connection.setRequestMethod("POST ");

// Post请求不能使用缓存

connection.setUseCaches(false);

//URLConnection.setFollowRedirects是static函数，作用于所有的URLConnection对象。

//connection.setFollowRedirects(true);

//URLConnection.setInstanceFollowRedirects是成员函数，仅作用于当前函数

connection.setInstanceFollowRedirects(true);

//配置连接的Content-type，配置为application/x-www-form-urlencoded的意思是正文是urlencoded编码过的form参数，下面我们可以看到我们对正文内容使用URLEncoder.encode进行编码

connection.setRequestProperty(" Content-Type",

" application/x-www-form-urlencoded");

//连接，从postUrl.openConnection()至此的配置必须要在connect之前完成，

//要注意的是connection.getOutputStream()会隐含的进行调用connect()，所以这里可以省略

//connection.connect();

DataOutputStream out = newDataOutputStream(connection

.getOutputStream());

//正文内容其实跟get的URL中'?'后的参数字符串一致

String content = " firstname="+URLEncoder.encode(" 一个大肥人 ", " utf-8 ");

//DataOutputStream.writeBytes将字符串中的16位的unicode字符以8位的字符形式写道流里面

out.writeBytes(content);

out.flush();

out.close(); // flush andclose

BufferedReader reader = newBufferedReader(newInputStreamReader(connection.getInputStream()));

Stringline;

System.out.println("============================= ");

System.out.println(" Contentsof post request ");

System.out.println("============================= ");

while ((line =reader.readLine()) != null) {

System.out.println(line);

}

System.out.println("============================= ");

System.out.println(" Contentsof post request ends ");

System.out.println("============================= ");

reader.close();

//connection.disconnect();

}

public static void main(String[] args){

// TODO Auto-generated methodstub

try {

readContentFromGet();

readContentFromPost();

} catch (IOException e){

// TODOAuto-generated catch block

e.printStackTrace();

}

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