使用Java发送这两种请求的代码大同小异,只是一些参数设置的不同。步骤如下:

通过统一资源定位器(java.net.URL)获取连接器(java.net.URLConnection)
设置请求的参数
发送请求
以输入流的形式获取返回内容
关闭输入流

Get

package com.test.httprequestdemo;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection; public class HttpGetRequest { /**
* Main
* @param args
* @throws Exception
*/
public static void main(String[] args) throws Exception {
System.out.println(doGet());
} /**
* Get Request
* @return
* @throws Exception
*/
public static String doGet() throws Exception {
URL localURL = new URL("http://localhost:8080/test/");
URLConnection connection = localURL.openConnection();
HttpURLConnection httpURLConnection = (HttpURLConnection)connection; httpURLConnection.setRequestProperty("Accept-Charset", "utf-8");
httpURLConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); InputStream inputStream = null;
InputStreamReader inputStreamReader = null;
BufferedReader reader = null;
StringBuffer resultBuffer = new StringBuffer();
String tempLine = null; if (httpURLConnection.getResponseCode() >= 300) {
throw new Exception("HTTP Request is not success, Response code is " + httpURLConnection.getResponseCode());
} try {
inputStream = httpURLConnection.getInputStream();
inputStreamReader = new InputStreamReader(inputStream);
reader = new BufferedReader(inputStreamReader); while ((tempLine = reader.readLine()) != null) {
resultBuffer.append(tempLine);
} } finally { if (reader != null) {
reader.close();
} if (inputStreamReader != null) {
inputStreamReader.close();
} if (inputStream != null) {
inputStream.close();
} } return resultBuffer.toString();
} }

Post

package com.test.httprequestdemo;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection; public class HttpPostRequest { /**
* Main
* @param args
* @throws Exception
*/
public static void main(String[] args) throws Exception {
System.out.println(doPost());
} /**
* Post Request
* @return
* @throws Exception
*/
public static String doPost() throws Exception {
String parameterData = "username=test"; URL localURL = new URL("http://localhost:8080/test/");
URLConnection connection = localURL.openConnection();
HttpURLConnection httpURLConnection = (HttpURLConnection)connection; httpURLConnection.setDoOutput(true);
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setRequestProperty("Accept-Charset", "utf-8");
httpURLConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
httpURLConnection.setRequestProperty("Content-Length", String.valueOf(parameterData.length())); OutputStream outputStream = null;
OutputStreamWriter outputStreamWriter = null;
InputStream inputStream = null;
InputStreamReader inputStreamReader = null;
BufferedReader reader = null;
StringBuffer resultBuffer = new StringBuffer();
String tempLine = null; try {
outputStream = httpURLConnection.getOutputStream();
outputStreamWriter = new OutputStreamWriter(outputStream); outputStreamWriter.write(parameterData.toString());
outputStreamWriter.flush(); if (httpURLConnection.getResponseCode() >= 300) {
throw new Exception("HTTP Request is not success, Response code is " + httpURLConnection.getResponseCode());
} inputStream = httpURLConnection.getInputStream();
inputStreamReader = new InputStreamReader(inputStream);
reader = new BufferedReader(inputStreamReader); while ((tempLine = reader.readLine()) != null) {
resultBuffer.append(tempLine);
} } finally { if (outputStreamWriter != null) {
outputStreamWriter.close();
} if (outputStream != null) {
outputStream.close();
} if (reader != null) {
reader.close();
} if (inputStreamReader != null) {
inputStreamReader.close();
} if (inputStream != null) {
inputStream.close();
} } return resultBuffer.toString();
} }

封装好的案例

package com.test.utils;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.InetSocketAddress;
import java.net.Proxy;
import java.net.URL;
import java.net.URLConnection;
import java.util.Iterator;
import java.util.Map; import org.apache.commons.lang.StringUtils;
import org.apache.log4j.Logger;
public class HttpRequestor {
private static final Logger logger = Logger.getLogger(HttpRequestor.class); public static void main(String[] args) throws Exception {
} private static Integer connectTimeout = null;
private static Integer socketTimeout = null;
private static String proxyHost = null;
private static Integer proxyPort = null; /**
* Do GET request
* @param url
* @param charset:(默认)utf-8
* @param contentType:(默认)application/x-www-form-urlencoded
* @return
* @throws Exception
* @throws IOException
*/
public static String doGet(String url,String charset,String contentType) {
if(StringUtils.isBlank(url)) return null;
if(StringUtils.isBlank(charset)) charset="utf-8";
if(StringUtils.isBlank(contentType)) contentType = "application/x-www-form-urlencoded";
logger.info("-------start-------request.get.http:"+url); InputStream inputStream = null;
InputStreamReader inputStreamReader = null;
BufferedReader reader = null;
StringBuffer resultBuffer = new StringBuffer();
String tempLine = null;
try {
URL localURL = new URL(url);
URLConnection connection = openConnection(localURL);
HttpURLConnection httpURLConnection = (HttpURLConnection)connection;
httpURLConnection.setRequestProperty("Accept-Charset", charset);
httpURLConnection.setRequestProperty("Content-Type",contentType);
if (httpURLConnection.getResponseCode() >= 300) {
throw new Exception("HTTP Request is not success, Response code is " + httpURLConnection.getResponseCode());
}
inputStream = httpURLConnection.getInputStream();
inputStreamReader = new InputStreamReader(inputStream);
reader = new BufferedReader(inputStreamReader); while ((tempLine = reader.readLine()) != null) {
resultBuffer.append(tempLine);
}
} catch (Exception e) {
e.printStackTrace();
} finally { if (reader != null) {
try {
reader.close();
} catch (IOException e) {
e.printStackTrace();
}
} if (inputStreamReader != null) {
try {
inputStreamReader.close();
} catch (IOException e) {
e.printStackTrace();
}
} if (inputStream != null) {
try {
inputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
} } logger.info("------end--------request.get");
return resultBuffer.toString();
} /**
* Do POST request
* @param url
* @param parameterMap
* @param charset:(默认)utf-8
* @param contentType:(默认)application/x-www-form-urlencoded
* @return
* @throws Exception
*/
public static String doPost(String url, Map<String,String> parameterMap,String charset,String contentType) {
if(StringUtils.isBlank(charset)) charset="utf-8";
if(StringUtils.isBlank(contentType)) contentType = "application/x-www-form-urlencoded";
logger.info("-------start-------request.post.http:"+url+"?"+parameterMap.toString()); StringBuffer parameterBuffer = new StringBuffer();
if (parameterMap != null) {
Iterator<String> iterator = parameterMap.keySet().iterator();
String key = null;
String value = null;
while (iterator.hasNext()) {
key = iterator.next();
value = parameterMap.get(key);
parameterBuffer.append(key).append("=").append(value==null?"":value);
if (iterator.hasNext()) {
parameterBuffer.append("&");
}
}
} OutputStream outputStream = null;
OutputStreamWriter outputStreamWriter = null;
InputStream inputStream = null;
InputStreamReader inputStreamReader = null;
BufferedReader reader = null;
StringBuffer resultBuffer = new StringBuffer();
String tempLine = null;
try {
URL localURL = new URL(url);
URLConnection connection = openConnection(localURL);
HttpURLConnection httpURLConnection = (HttpURLConnection)connection; httpURLConnection.setDoOutput(true);
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setRequestProperty("Accept-Charset", charset);
httpURLConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
httpURLConnection.setRequestProperty("Content-Length", String.valueOf(parameterBuffer.length()));
outputStream = httpURLConnection.getOutputStream();
outputStreamWriter = new OutputStreamWriter(outputStream);
outputStreamWriter.write(parameterBuffer.toString());
outputStreamWriter.flush(); if (httpURLConnection.getResponseCode() >= 300) {
throw new Exception("HTTP Request is not success, Response code is " + httpURLConnection.getResponseCode());
}
inputStream = httpURLConnection.getInputStream();
inputStreamReader = new InputStreamReader(inputStream);
reader = new BufferedReader(inputStreamReader); while ((tempLine = reader.readLine()) != null) {
resultBuffer.append(tempLine);
}
} catch (Exception e) {
e.printStackTrace(); } finally { if (outputStreamWriter != null) {
try {
outputStreamWriter.close();
} catch (IOException e) {
e.printStackTrace();
}
} if (outputStream != null) {
try {
outputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
} if (reader != null) {
try {
reader.close();
} catch (IOException e) {
e.printStackTrace();
}
} if (inputStreamReader != null) {
try {
inputStreamReader.close();
} catch (IOException e) {
e.printStackTrace();
}
} if (inputStream != null) {
try {
inputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
} } logger.info("------end--------request.post");
return resultBuffer.toString();
} private static URLConnection openConnection(URL localURL) throws IOException {
URLConnection connection;
if (proxyHost != null && proxyPort != null) {
Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress(proxyHost, proxyPort));
connection = localURL.openConnection(proxy);
} else {
connection = localURL.openConnection();
}
renderRequest(connection);
return connection;
} /**
* Render request according setting
* @param request
*/
private static void renderRequest(URLConnection connection) { if (connectTimeout != null) {
connection.setConnectTimeout(connectTimeout);
} if (socketTimeout != null) {
connection.setReadTimeout(socketTimeout);
} } /*
* Getter & Setter
*/
public Integer getConnectTimeout() {
return connectTimeout;
} public void setConnectTimeout(Integer connectTimeout) {
HttpRequestor.connectTimeout = connectTimeout;
} public Integer getSocketTimeout() {
return socketTimeout;
} public void setSocketTimeout(Integer socketTimeout) {
HttpRequestor.socketTimeout = socketTimeout;
} public String getProxyHost() {
return proxyHost;
} public void setProxyHost(String proxyHost) {
HttpRequestor.proxyHost = proxyHost;
} public Integer getProxyPort() {
return proxyPort;
} public void setProxyPort(Integer proxyPort) {
HttpRequestor.proxyPort = proxyPort;
} }

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