java发起HTTP请求的共用类
一定要注意编码，请求时，content-type里的编码，仅仅是流的编码，而结果的编码类型，则是流转化为字符串是需要设定的。
以下是3种使用get/post的方式：
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.Socket;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry; import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair; /**
* @Description:发送http请求帮助类
*/
public class HttpHelper { /**
* POST请求
*
* @param urlStr 请求地址
* @param params 参数字典
* @param charset 编码，最好传“UTF-8”
* @return
* @exception RuntimeException
*/
public static String sendPostByHttpUrlConnection(String urlStr, Map<String, Object> params, String charset) {
StringBuffer resultBuffer = null;
// 构建请求参数
String sbParams= JoiningTogetherParams(params);
HttpURLConnection con = null;
OutputStreamWriter osw = null;
BufferedReader br = null;
// 发送请求
try {
URL url = new URL(urlStr);
con = (HttpURLConnection) url.openConnection();
con.setRequestMethod("POST");
con.setDoOutput(true);
con.setDoInput(true);
con.setUseCaches(false);
con.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
if (sbParams != null && sbParams.length() > 0) {
osw = new OutputStreamWriter(con.getOutputStream(), charset);
osw.write(sbParams);
osw.flush();
}
// 读取返回内容
resultBuffer = new StringBuffer();
int contentLength = Integer.parseInt(con.getHeaderField("Content-Length"));
if (contentLength > 0) {
br = new BufferedReader(new InputStreamReader(con.getInputStream(), charset));
String temp;
while ((temp = br.readLine()) != null) {
resultBuffer.append(temp);
}
}
} catch (Exception e) {
throw new RuntimeException(e);
} finally {
if (osw != null) {
try {
osw.close();
} catch (IOException e) {
osw = null;
throw new RuntimeException(e);
} finally {
if (con != null) {
con.disconnect();
con = null;
}
}
}
if (br != null) {
try {
br.close();
} catch (IOException e) {
br = null;
throw new RuntimeException(e);
} finally {
if (con != null) {
con.disconnect();
con = null;
}
}
}
} return resultBuffer.toString();
} public static String sendPostByUrlConnection(String urlStr, Map<String, Object> params, String charset) {
StringBuffer resultBuffer = null;
// 构建请求参数
String sbParams= JoiningTogetherParams(params);
URLConnection con = null;
OutputStreamWriter osw = null;
BufferedReader br = null;
try {
URL realUrl = new URL(urlStr);
// 打开和URL之间的连接
con = realUrl.openConnection();
// 设置通用的请求属性
con.setRequestProperty("accept", "*/*");
con.setRequestProperty("connection", "Keep-Alive");
con.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
con.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
// 发送POST请求必须设置如下两行
con.setDoOutput(true);
con.setDoInput(true);
// 获取URLConnection对象对应的输出流
osw = new OutputStreamWriter(con.getOutputStream(), charset);
if (sbParams != null && sbParams.length() > 0) {
// 发送请求参数
osw.write(sbParams);
// flush输出流的缓冲
osw.flush();
}
// 定义BufferedReader输入流来读取URL的响应
resultBuffer = new StringBuffer();
int contentLength = Integer.parseInt(con.getHeaderField("Content-Length"));
if (contentLength > 0) {
br = new BufferedReader(new InputStreamReader(con.getInputStream(), charset));
String temp;
while ((temp = br.readLine()) != null) {
resultBuffer.append(temp);
}
}
} catch (Exception e) {
throw new RuntimeException(e);
} finally {
if (osw != null) {
try {
osw.close();
} catch (IOException e) {
osw = null;
throw new RuntimeException(e);
}
}
if (br != null) {
try {
br.close();
} catch (IOException e) {
br = null;
throw new RuntimeException(e);
}
}
}
return resultBuffer.toString();
} public static String sendGetByHttpUrlConnection(String urlStr, Map<String, Object> params, String charset) {
StringBuffer resultBuffer = null;
// 构建请求参数
String sbParams= JoiningTogetherParams(params);
HttpURLConnection con = null;
BufferedReader br = null;
try {
URL url = null;
if (sbParams != null && sbParams.length() > 0) {
url = new URL(urlStr + "?" + sbParams);
} else {
url = new URL(urlStr);
}
con = (HttpURLConnection) url.openConnection();
con.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
con.connect();
resultBuffer = new StringBuffer();
br = new BufferedReader(new InputStreamReader(con.getInputStream(), charset));
String temp;
while ((temp = br.readLine()) != null) {
resultBuffer.append(temp);
}
} catch (Exception e) {
throw new RuntimeException(e);
} finally {
if (br != null) {
try {
br.close();
} catch (IOException e) {
br = null;
throw new RuntimeException(e);
} finally {
if (con != null) {
con.disconnect();
con = null;
}
}
}
}
return resultBuffer.toString();
} public static String sendGetByUrlConnection(String urlStr, Map<String, Object> params, String charset) {
StringBuffer resultBuffer = null;
// 构建请求参数
String sbParams= JoiningTogetherParams(params);
BufferedReader br = null;
try {
URL url = null;
if (sbParams != null && sbParams.length() > 0) {
url = new URL(urlStr + "?" + sbParams);
} else {
url = new URL(urlStr);
}
URLConnection con = url.openConnection();
// 设置请求属性
con.setRequestProperty("accept", "*/*");
con.setRequestProperty("connection", "Keep-Alive");
con.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
con.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
// 建立连接
con.connect();
resultBuffer = new StringBuffer();
br = new BufferedReader(new InputStreamReader(con.getInputStream(), charset));
String temp;
while ((temp = br.readLine()) != null) {
resultBuffer.append(temp);
}
} catch (Exception e) {
throw new RuntimeException(e);
} finally {
if (br != null) {
try {
br.close();
} catch (IOException e) {
br = null;
throw new RuntimeException(e);
}
}
}
return resultBuffer.toString();
} public static String httpClientPost(String urlStr, Map<String, Object> params, String charset) {
StringBuffer resultBuffer = null;
HttpClient client = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(urlStr);
// 构建请求参数
List<NameValuePair> list = new ArrayList<NameValuePair>();
Iterator<Entry<String, Object>> iterator = params.entrySet().iterator();
while (iterator.hasNext()) {
Entry<String, Object> elem = iterator.next();
list.add(new BasicNameValuePair(elem.getKey(), String.valueOf(elem.getValue())));
}
BufferedReader br = null;
try {
if (list.size() > 0) {
UrlEncodedFormEntity entity = new UrlEncodedFormEntity(list, charset);
httpPost.setEntity(entity);
}
HttpResponse response = client.execute(httpPost);
// 读取服务器响应数据
resultBuffer = new StringBuffer();
br = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
String temp;
while ((temp = br.readLine()) != null) {
resultBuffer.append(temp);
}
} catch (Exception e) {
throw new RuntimeException(e);
} finally {
if (br != null) {
try {
br.close();
} catch (IOException e) {
br = null;
throw new RuntimeException(e);
}
}
}
return resultBuffer.toString();
} public static String httpClientGet(String urlStr, Map<String, Object> params, String charset) {
StringBuffer resultBuffer = null;
HttpClient client = new DefaultHttpClient();
BufferedReader br = null;
// 构建请求参数
StringBuffer sbParams = new StringBuffer();
if (params != null && params.size() > 0) {
for (Entry<String, Object> entry : params.entrySet()) {
sbParams.append(entry.getKey());
sbParams.append("=");
try {
sbParams.append(URLEncoder.encode(String.valueOf(entry.getValue()), charset));
} catch (UnsupportedEncodingException e) {
throw new RuntimeException(e);
}
sbParams.append("&");
}
}
if (sbParams != null && sbParams.length() > 0) {
urlStr = urlStr + "?" + sbParams.substring(0, sbParams.length() - 1);
}
HttpGet httpGet = new HttpGet(urlStr);
try {
HttpResponse response = client.execute(httpGet);
// 读取服务器响应数据
br = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
String temp;
resultBuffer = new StringBuffer();
while ((temp = br.readLine()) != null) {
resultBuffer.append(temp);
}
} catch (Exception e) {
throw new RuntimeException(e);
} finally {
if (br != null) {
try {
br.close();
} catch (IOException e) {
br = null;
throw new RuntimeException(e);
}
}
}
return resultBuffer.toString();
} public static String sendSocketPost(String urlStr, Map<String, Object> params, String charset) {
String result = "";
// 构建请求参数
StringBuffer sbParams = new StringBuffer();
if (params != null && params.size() > 0) {
for (Entry<String, Object> entry : params.entrySet()) {
sbParams.append(entry.getKey());
sbParams.append("=");
sbParams.append(entry.getValue());
sbParams.append("&");
}
}
Socket socket = null;
OutputStreamWriter osw = null;
InputStream is = null;
try {
URL url = new URL(urlStr);
String host = url.getHost();
int port = url.getPort();
if (-1 == port) {
port = 80;
}
String path = url.getPath();
socket = new Socket(host, port);
StringBuffer sb = new StringBuffer();
sb.append("POST " + path + " HTTP/1.1\r\n");
sb.append("Host: " + host + "\r\n");
sb.append("Connection: Keep-Alive\r\n");
sb.append("Content-Type: application/x-www-form-urlencoded; charset=utf-8 \r\n");
sb.append("Content-Length: ").append(sb.toString().getBytes().length).append("\r\n");
// 这里一个回车换行，表示消息头写完，不然服务器会继续等待
sb.append("\r\n");
if (sbParams != null && sbParams.length() > 0) {
sb.append(sbParams.substring(0, sbParams.length() - 1));
}
osw = new OutputStreamWriter(socket.getOutputStream());
osw.write(sb.toString());
osw.flush();
is = socket.getInputStream();
String line = null;
// 服务器响应体数据长度
int contentLength = 0;
// 读取http响应头部信息
do {
line = readLine(is, 0, charset);
if (line.startsWith("Content-Length")) {
// 拿到响应体内容长度
contentLength = Integer.parseInt(line.split(":")[1].trim());
}
// 如果遇到了一个单独的回车换行，则表示请求头结束
} while (!line.equals("\r\n"));
// 读取出响应体数据（就是你要的数据）
result = readLine(is, contentLength, charset);
} catch (Exception e) {
throw new RuntimeException(e);
} finally {
if (osw != null) {
try {
osw.close();
} catch (IOException e) {
osw = null;
throw new RuntimeException(e);
} finally {
if (socket != null) {
try {
socket.close();
} catch (IOException e) {
socket = null;
throw new RuntimeException(e);
}
}
}
}
if (is != null) {
try {
is.close();
} catch (IOException e) {
is = null;
throw new RuntimeException(e);
} finally {
if (socket != null) {
try {
socket.close();
} catch (IOException e) {
socket = null;
throw new RuntimeException(e);
}
}
}
}
}
return result;
} public static String sendSocketGet(String urlStr, Map<String, Object> params, String charset) {
String result = "";
// 构建请求参数
StringBuffer sbParams = new StringBuffer();
if (params != null && params.size() > 0) {
for (Entry<String, Object> entry : params.entrySet()) {
sbParams.append(entry.getKey());
sbParams.append("=");
sbParams.append(entry.getValue());
sbParams.append("&");
}
}
Socket socket = null;
OutputStreamWriter osw = null;
InputStream is = null;
try {
URL url = new URL(urlStr);
String host = url.getHost();
int port = url.getPort();
if (-1 == port) {
port = 80;
}
String path = url.getPath();
socket = new Socket(host, port);
StringBuffer sb = new StringBuffer();
sb.append("GET " + path + " HTTP/1.1\r\n");
sb.append("Host: " + host + "\r\n");
sb.append("Connection: Keep-Alive\r\n");
sb.append("Content-Type: application/x-www-form-urlencoded; charset=utf-8 \r\n");
sb.append("Content-Length: ").append(sb.toString().getBytes().length).append("\r\n");
// 这里一个回车换行，表示消息头写完，不然服务器会继续等待
sb.append("\r\n");
if (sbParams != null && sbParams.length() > 0) {
sb.append(sbParams.substring(0, sbParams.length() - 1));
}
osw = new OutputStreamWriter(socket.getOutputStream());
osw.write(sb.toString());
osw.flush();
is = socket.getInputStream();
String line = null;
// 服务器响应体数据长度
int contentLength = 0;
// 读取http响应头部信息
do {
line = readLine(is, 0, charset);
if (line.startsWith("Content-Length")) {
// 拿到响应体内容长度
contentLength = Integer.parseInt(line.split(":")[1].trim());
}
// 如果遇到了一个单独的回车换行，则表示请求头结束
} while (!line.equals("\r\n"));
// 读取出响应体数据（就是你要的数据）
result = readLine(is, contentLength, charset);
} catch (Exception e) {
throw new RuntimeException(e);
} finally {
if (osw != null) {
try {
osw.close();
} catch (IOException e) {
osw = null;
throw new RuntimeException(e);
} finally {
if (socket != null) {
try {
socket.close();
} catch (IOException e) {
socket = null;
throw new RuntimeException(e);
}
}
}
}
if (is != null) {
try {
is.close();
} catch (IOException e) {
is = null;
throw new RuntimeException(e);
} finally {
if (socket != null) {
try {
socket.close();
} catch (IOException e) {
socket = null;
throw new RuntimeException(e);
}
}
}
}
}
return result;
} private static String readLine(InputStream is, int contentLength, String charset) throws IOException {
List<Byte> lineByte = new ArrayList<Byte>();
byte tempByte;
int cumsum = 0;
if (contentLength != 0) {
do {
tempByte = (byte) is.read();
lineByte.add(Byte.valueOf(tempByte));
cumsum++;
} while (cumsum < contentLength);// cumsum等于contentLength表示已读完
} else {
do {
tempByte = (byte) is.read();
lineByte.add(Byte.valueOf(tempByte));
} while (tempByte != 10);// 换行符的ascii码值为10
} byte[] resutlBytes = new byte[lineByte.size()];
for (int i = 0; i < lineByte.size(); i++) {
resutlBytes[i] = (lineByte.get(i)).byteValue();
}
return new String(resutlBytes, charset);
} private static String JoiningTogetherParams(Map<String, Object> params){
StringBuffer sbParams = new StringBuffer();
if (params != null && params.size() > 0) {
for (Entry<String, Object> e : params.entrySet()) {
sbParams.append(e.getKey());
sbParams.append("=");
sbParams.append(e.getValue());
sbParams.append("&");
}
return sbParams.substring(0, sbParams.length() - 1);
}
return "";
}
}
java发起HTTP请求的共用类的更多相关文章
- 如何使用HttpClient包实现JAVA发起HTTP请求？
今天在搭建公司项目框架的时候,发现缺少了一个Java发送HTTP请求的工具类,在网上找了一通,经过自己的改造,已经能实现get请求和post请求的了,现在将代码贴在这里.给大家参考. 1 packag ...
- 关于java发起http请求
我们到底能走多远系列(41) 扯淡: 好久没总结点东西了,技术上没什么总结,感觉做事空牢牢的.最近也比较疲惫. 分享些东西,造福全人类~ 主题: 1,java模拟发起一个http请求 使用HttpUR ...
- 用Java发起HTTP请求与获取状态码(含状态码列表)
转自:https://blog.csdn.net/xyw591238/article/details/51072697 在使用Java请求Web程序比如访问WebService接口时,通常需要先判断访 ...
- 通过java发送http请求
通常的http请求都是由用户点击某个连接或者按钮来发起的,但是在一些后台的Java程序中需要发送一些get或这post请求,因为不涉及前台页面,该怎么办呢? 下面为大家提供一个Java发送http请求 ...
- 第三篇 ：微信公众平台开发实战Java版之请求消息，响应消息以及事件消息类的封装
微信服务器和第三方服务器之间究竟是通过什么方式进行对话的? 下面,我们先看下图: 其实我们可以简单的理解: (1)首先,用户向微信服务器发送消息: (2)微信服务器接收到用户的消息处理之后,通过开发者 ...
- [Java] 两种发起POST请求方法，并接收返回的响应内容的处理方式
1.利用apache提供的commons-httpclient-3.0.jar包 代码如下: /** * 利用HttpClient发起POST请求,并接收返回的响应内容 * * @param url ...
- java中两种发起POST请求，并接收返回的响应内容的方式 （转）
http://xyz168000.blog.163.com/blog/static/21032308201162293625569/ 2.利用java自带的java.net.*包下提供的工具类 代码如 ...
- MySQL_(Java)使用JDBC向数据库发起查询请求
MySQL_(Java)使用JDBC向数据库发起查询请求 传送门 MySQL_(Java)使用JDBC创建用户名和密码校验查询方法 传送门 MySQL_(Java)使用preparestatement ...
- java如何发起https请求
1.写一个SSLClient类,继承至HttpClient import java.security.cert.CertificateException; import java.security.c ...
随机推荐
- Django + Uwsgi + Nginx 实现生产环境 项目部署
内容: uwsgi 介绍 uwsgi安装使用 nginx安装配置 django with nginx 如何在生产上部署Django项目? Django项目的部署可以有很多方式,采用nginx+uwsg ...
- android 回调函数使用简介
//1---定义回调函数 public interface GirdMenuStateListener { void onSuccess(); void onError(); } //2---使用的地 ...
- IE不兼容document.getElementsByClassName
在DOM3里已经加入了getElementsByClassName这个方法,然而IE9.10以外的其它版本均不支持,这是一块伤痛啊! 目前可以这么解决,判断浏览器支不支持这个方法,如果支持就不管:如果 ...
- Apache Oltu 实现 OAuth2.0 服务端【授权码模式(Authorization Code)】
要实现OAuth服务端,就得先理解客户端的调用流程,服务提供商实现可能也有些区别,实现OAuth服务端的方式很多,具体可能看 http://oauth.net/code/ 各语言的实现有(我使用了Ap ...
- j2ee高级开发技术课程第四周
分析hello.java,在hello1项目中.下载链接:https://github.com/javaee/tutorial-examples/tree/master/web/jsf/hello1 ...
- SingleThreadExecutor（单线程执行器）
前要:一般的执行器会为每个任务单独创建线程,起码是分配单独的线程,即每个任务有其自己的线程.这样可以让任务并发执行. 问题:既然这样,为什么只用一个线程处理多个任务呢? 如果是这样,那一个 ...
- Nginx+uwsgi+Django 的web应用环境部署-完整记录
Python作为当前最火爆最热门,也是最主要的Web开发语言之一,在其二十多年的历史中出现了数十种Web框架,比如Django.Tornado.Flask.Twisted.Bottle和Web.py等 ...
- OAuth2.0的理解&基础
此文章是复制黏贴网上文章的,主要做自己备用着看(也加了自己的一点见解),喜欢的读者也可以看. OAuth是一个关于授权(authorization)的开放网络标准,在全世界得到广泛应用,目前的版本是2 ...
- Oracle数据库基本常用命令汇总
1.得到数据库名和创建日期SELECT name, created, log_mode, open_mode FROM v$database; 2.ORACLE数据库的计算机的主机名,ORACLE数据 ...
- JSON数据的各种操作
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.R ...