URLConnection发送HTTP请求的方法_动力节点Java学院整理

package com.bjpowernode.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/OneHttpServer/");    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();  }  }

package com.bjpowernode.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=nickhuang&blog=http://www.cnblogs.com/nick-huang/";        URL localURL = new URL("http://localhost:8080/OneHttpServer/");    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();  }}

package com.bjpowernode.util.httprequestor;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;public class HttpRequestor {    private String charset = "utf-8";  private Integer connectTimeout = null;  private Integer socketTimeout = null;  private String proxyHost = null;  private Integer proxyPort = null;    /**   * Do GET request   * @param url   * @return   * @throws Exception   * @throws IOException   */  public String doGet(String url) throws Exception {        URL localURL = new URL(url);        URLConnection connection = openConnection(localURL);    HttpURLConnection httpURLConnection = (HttpURLConnection)connection;        httpURLConnection.setRequestProperty("Accept-Charset", charset);    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();  }    /**   * Do POST request   * @param url   * @param parameterMap   * @return   * @throws Exception    */  public String doPost(String url, Map parameterMap) throws Exception {        /* Translate parameter map to parameter date string */    StringBuffer parameterBuffer = new StringBuffer();    if (parameterMap != null) {      Iterator iterator = parameterMap.keySet().iterator();      String key = null;      String value = null;      while (iterator.hasNext()) {        key = (String)iterator.next();        if (parameterMap.get(key) != null) {          value = (String)parameterMap.get(key);        } else {          value = "";        }                parameterBuffer.append(key).append("=").append(value);        if (iterator.hasNext()) {          parameterBuffer.append("&");        }      }    }        System.out.println("POST parameter : " + parameterBuffer.toString());        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 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(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);      }          } 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();  }  private 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();    }    return connection;  }    /**   * Render request according setting   * @param request   */  private 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) {    this.connectTimeout = connectTimeout;  }  public Integer getSocketTimeout() {    return socketTimeout;  }  public void setSocketTimeout(Integer socketTimeout) {    this.socketTimeout = socketTimeout;  }  public String getProxyHost() {    return proxyHost;  }  public void setProxyHost(String proxyHost) {    this.proxyHost = proxyHost;  }  public Integer getProxyPort() {    return proxyPort;  }  public void setProxyPort(Integer proxyPort) {    this.proxyPort = proxyPort;  }  public String getCharset() {    return charset;  }  public void setCharset(String charset) {    this.charset = charset;  }  }

package com.bjpowernode.util.httprequestor;import java.util.HashMap;import java.util.Map;public class Call {  public static void main(String[] args) throws Exception {        /* Post Request */    Map dataMap = new HashMap();    dataMap.put("username", "Nick Huang");    dataMap.put("blog", "IT");    System.out.println(new HttpRequestor().doPost("http://localhost:8080/OneHttpServer/", dataMap));        /* Get Request */    System.out.println(new HttpRequestor().doGet("http://localhost:8080/OneHttpServer/"));  }}

import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class LoginServlet extends HttpServlet {  private static final long serialVersionUID = 1L;      public LoginServlet() {    super();  }  protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {    this.doPost(request, response);  }  protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {    String username = request.getParameter("username");    String blog = request.getParameter("blog");        System.out.println(username);    System.out.println(blog);        response.setContentType("text/plain; charset=UTF-8");    response.setCharacterEncoding("UTF-8");    response.getWriter().write("It is ok!");  }}

<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5"> <display-name>OneHttpServer</display-name> <welcome-file-list>  <welcome-file>LoginServlet</welcome-file> </welcome-file-list>  <servlet>  <description></description>  <display-name>LoginServlet</display-name>  <servlet-name>LoginServlet</servlet-name>  <servlet-class>LoginServlet</servlet-class> </servlet> <servlet-mapping>  <servlet-name>LoginServlet</servlet-name>  <url-pattern>/LoginServlet</url-pattern> </servlet-mapping> </web-app>