HttpClient的相关例子

1、HttpClient4使用GET方式通过代理服务器读取页面的例子

import java.io.BufferedReader;
import java.io.InputStreamReader;
import org.apache.http.HttpEntity;
import org.apache.http.HttpHost;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.conn.params.ConnRoutePNames;
import org.apache.http.impl.client.DefaultHttpClient;

/**
* HttpClient使用GET方式通过代理服务器读取页面的例子。
* 
* @author JAVA世纪网(java2000.net, laozizhu.com)
*/
public class HttpClientGet {

public static void main(String[] args) throws Exception {

DefaultHttpClient httpclient = new DefaultHttpClient();

// 访问的目标站点，端口和协议HttpHost targetHost = new HttpHost("www.java2000.net");

// 代理的设置HttpHost proxy = new HttpHost("10.60.8.20", 8080);httpclient.getParams().setParameter(ConnRoutePNames.DEFAULT_PROXY, proxy);

// 目标地址HttpGet httpget = new HttpGet("/");System.out.println("目标: " + targetHost);System.out.println("请求: " + httpget.getRequestLine());

// 执行HttpResponse respOnse= httpclient.execute(targetHost, httpget);HttpEntity entity = response.getEntity();System.out.println("----------------------------------------");System.out.println(response.getStatusLine());if (entity != null) {System.out.println("Response content length: " + entity.getContentLength());}

// 显示结果BufferedReader reader = new BufferedReader(new InputStreamReader(entity.getContent(), "UTF-8"));String line = null;while ((line = reader.readLine()) != null) {System.out.println(line);}if (entity != null) {entity.consumeContent();}}}

2、HttpClient 4使用post方式提交普通表单数据

import java.io.BufferedReader;
import java.io.InputStreamReader;
import org.apache.http.HttpEntity;
import org.apache.http.HttpHost;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.conn.params.ConnRoutePNames;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;

/**
* HttpClient 4 使用POST方式提交普通表单数据的例子.
* 
* @author JAVA世纪网(java2000.net, laozizhu.com)
*/
public class HttpClientPost {

public static void main(String[] args) throws Exception {

DefaultHttpClient httpclient = new DefaultHttpClient();

// 代理的设置HttpHost proxy = new HttpHost("10.60.8.20", 8080);httpclient.getParams().setParameter(ConnRoutePNames.DEFAULT_PROXY, proxy);

// 目标地址HttpPost httppost = new HttpPost("http://www.java2000.net/login.jsp");System.out.println("请求: " + httppost.getRequestLine());

// 构造最简单的字符串数据StringEntity reqEntity = new StringEntity("username=test&password=test");

// 设置类型reqEntity.setContentType("application/x-www-form-urlencoded");

// 设置请求的数据httppost.setEntity(reqEntity);

// 执行HttpResponse respOnse= httpclient.execute(httppost);HttpEntity entity = response.getEntity();System.out.println("----------------------------------------");System.out.println(response.getStatusLine());if (entity != null) {System.out.println("Response content length: " + entity.getContentLength());}

// 显示结果BufferedReader reader = new BufferedReader(new InputStreamReader(entity.getContent(), "UTF-8"));String line = null;while ((line = reader.readLine()) != null) {System.out.println(line);}if (entity != null) {entity.consumeContent();}}}

3、HttpClient 4.0通过代理访问Https的代码例子

import java.io.BufferedReader;
import java.io.InputStreamReader;
import org.apache.http.HttpEntity;
import org.apache.http.HttpHost;
import org.apache.http.HttpResponse;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.conn.params.ConnRoutePNames;
import org.apache.http.impl.client.DefaultHttpClient;
/**
* HttpClient 4.0通过代理访问Https的代码例子。
* 
* @author JAVA世纪网(java2000.net, laozizhu.com)
*/
public class HttpsProxyGet {

public static void main(String[] args) throws Exception {

DefaultHttpClient httpclient = new DefaultHttpClient();

// 认证的数据// 我这里是瞎写的，请根据实际情况填写httpclient.getCredentialsProvider().setCredentials(new AuthScope("10.60.8.20", 8080),new UsernamePasswordCredentials("username", "password"));

// 访问的目标站点，端口和协议HttpHost targetHost = new HttpHost("www.google.com", 443, "https");

// 代理的设置HttpHost proxy = new HttpHost("10.60.8.20", 8080);httpclient.getParams().setParameter(ConnRoutePNames.DEFAULT_PROXY, proxy);

// 目标地址HttpGet httpget = new HttpGet("/adsense/login/zh_CN/?");System.out.println("目标: " + targetHost);System.out.println("请求: " + httpget.getRequestLine());System.out.println("代理: " + proxy);

// 执行HttpResponse respOnse= httpclient.execute(targetHost, httpget);HttpEntity entity = response.getEntity();System.out.println("----------------------------------------");System.out.println(response.getStatusLine());if (entity != null) {System.out.println("Response content length: " + entity.getContentLength());}

// 显示结果BufferedReader reader = new BufferedReader(new InputStreamReader(entity.getContent(), "UTF-8"));String line = null;while ((line = reader.readLine()) != null) {System.out.println(line);}if (entity != null) {entity.consumeContent();}}}

4、HttpClient读取页面的使用例子

package com.laozizhu.apache.httpclient;
import java.net.Socket;
import org.apache.http.ConnectionReuseStrategy;
import org.apache.http.Header;
import org.apache.http.HttpHost;
import org.apache.http.HttpResponse;
import org.apache.http.HttpVersion;
import org.apache.http.impl.DefaultConnectionReuseStrategy;
import org.apache.http.impl.DefaultHttpClientConnection;
import org.apache.http.message.BasicHttpRequest;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.params.HttpParams;
import org.apache.http.params.HttpProtocolParams;
import org.apache.http.protocol.BasicHttpContext;
import org.apache.http.protocol.BasicHttpProcessor;
import org.apache.http.protocol.ExecutionContext;
import org.apache.http.protocol.HttpContext;
import org.apache.http.protocol.HttpRequestExecutor;
import org.apache.http.protocol.RequestConnControl;
import org.apache.http.protocol.RequestContent;
import org.apache.http.protocol.RequestExpectContinue;
import org.apache.http.protocol.RequestTargetHost;
import org.apache.http.protocol.RequestUserAgent;
import org.apache.http.util.EntityUtils;
/**
* HttpClient读取页面的使用例子
* @author 老紫竹(java2000.net)
*
*/
public class HttpGet {
public static void main(String[] args) throws Exception {

 HttpParams params = new BasicHttpParams();

// HTTP 协议的版本,1.1/1.0/0.9HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1);

// 字符集HttpProtocolParams.setContentCharset(params, "UTF-8");

// 伪装的浏览器类型// IE7 是 // Mozilla/4.0 (compatible; MSIE 7.0b; Windows NT 6.0)//// Firefox3.03// Mozilla/5.0 (Windows; U; Windows NT 5.2; zh-CN; rv:1.9.0.3) Gecko/2008092417 Firefox/3.0.3//

HttpProtocolParams.setUserAgent(params, "HttpComponents/1.1");HttpProtocolParams.setUseExpectContinue(params, true);    BasicHttpProcessor httpproc = new BasicHttpProcessor();    httpproc.addInterceptor(new RequestContent());httpproc.addInterceptor(new RequestTargetHost());    httpproc.addInterceptor(new RequestConnControl());httpproc.addInterceptor(new RequestUserAgent());httpproc.addInterceptor(new RequestExpectContinue());    HttpRequestExecutor httpexecutor = new HttpRequestExecutor();    HttpContext cOntext= new BasicHttpContext(null);HttpHost host = new HttpHost("www.java2000.net", 80);    DefaultHttpClientConnection cOnn= new DefaultHttpClientConnection();ConnectionReuseStrategy cOnnStrategy= new DefaultConnectionReuseStrategy();    context.setAttribute(ExecutionContext.HTTP_CONNECTION, conn);context.setAttribute(ExecutionContext.HTTP_TARGET_HOST, host);    try {      String[] targets = { "/", "/help.jsp" };      for (int i = 0; i > Request URI: " + request.getRequestLine().getUri());        context.setAttribute(ExecutionContext.HTTP_REQUEST, request);request.setParams(params);httpexecutor.preProcess(request, httpproc, context);HttpResponse respOnse= httpexecutor.execute(request, conn, context);response.setParams(params);httpexecutor.postProcess(response, httpproc, context);

        // 返回码System.out.println("<
// 返回的文件头信息Header[] hs = response.getAllHeaders();for (Header h : hs) {System.out.println(h.getName() + ":" + h.getValue());}// 输出主体信息System.out.println(EntityUtils.toString(response.getEntity()));System.out.println("==============");if (!connStrategy.keepAlive(response, context)) {conn.close();} else {System.out.println("Connection kept alive...");}}} finally {conn.close();}}}
5、httpclient中文乱码解决

httpclient默认使用ISO-8859-1读取http响应的内容，如果内容中包含汉字的话就得动用丑陋的new String(str.getBytes("ISO-8859-1"),"GBK");语句了。

解决办法就是使用以下配置。
private static final String CONTENT_CHARSET = "GBK";// httpclient读取内容时使用的字符集
HttpClient client = new HttpClient();
client.getParams().setParameter(HttpMethodParams.HTTP_CONTENT_CHARSET, CONTENT_CHARSET);
6、HttpClient 4处理文件上传的例子(MultipartEntity)
import java.io.File;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.mime.MultipartEntity;
import org.apache.http.entity.mime.content.FileBody;
import org.apache.http.entity.mime.content.StringBody;
import org.apache.http.impl.client.DefaultHttpClient;
/*** HttpClient 4处理文件上传的例子(MultipartEntity).
* 需要 James Mime4j 0.5的版本，0.6的不行。* * @author JAVA世纪网(java2000.net, laozizhu.com)*/public class HttpClientMultipartFormPost {
public static void main(String[] args) throws Exception {
HttpClient httpclient = new DefaultHttpClient();HttpPost httppost = new HttpPost("http://localhost");
// 一个本地的文件FileBody bin = new FileBody(new File("d:/BIMG1181.JPG"));
// 一个字符串StringBody comment = new StringBody("A binary file of some kind");
// 多部分的实体MultipartEntity reqEntity = new MultipartEntity();
// 增加reqEntity.addPart("bin", bin);reqEntity.addPart("comment", comment);
// 设置httppost.setEntity(reqEntity);
System.out.println("执行: " + httppost.getRequestLine());
HttpResponse respOnse= httpclient.execute(httppost);HttpEntity resEntity = response.getEntity();
System.out.println("----------------------------------------");System.out.println(response.getStatusLine());if (resEntity != null) {System.out.println("返回长度: " + resEntity.getContentLength());}if (resEntity != null) {resEntity.consumeContent();}}}