? ? ?版權聲明：本文為博主原創文章，未經博主允許不得轉載。如需轉載請聲明：【轉自 http://blog.csdn.net/xiaoxian8023 】 ? ? ?HttpClient的支持在HTTP/1.1規范中定義的所有的HTTP方法：GET, HEAD, POST, PUT, DELETE, TRACE 和 OPTIONS。每有一個方法都有一個對應的類：HttpGet，HttpHead，HttpPost，HttpPut，HttpDelete，HttpTrace和HttpOptions。所有的這些類均實現了HttpUriRequest接口，故可以作為execute的執行參數使用。請求URI是能夠應用請求的統一資源標識符。 HTTP請求的URI包含一個協議計劃protocol scheme，主機名host name,，可選的端口optional port，資源的路徑resource path，可選的查詢optional query和可選的片段optional fragment。 ? ? ?head，put，delete，trace?HttpClient支持這些方法， 大多數瀏覽器不支持這些方法，原因是Html 4中對 FORM 的method方法只支持兩個get和post，很多瀏覽器還都依然是基于html4的。 ? ? ?通常會在JAVA中通過代碼調用URL進行遠端方法調用，這些方法有的是Get請求方式的，有的是POST請求方式的，為此，總結一例，貼出以便查閱。 ? ? ?依賴JAR包有：commons-codec.jar,commons-httpclient.jar,commons-logging.jar。 ~~~ package com.wujintao.httpclient; import java.io.IOException; import java.io.InputStream; import org.apache.commons.httpclient.DefaultHttpMethodRetryHandler; import org.apache.commons.httpclient.HttpClient; import org.apache.commons.httpclient.HttpException; import org.apache.commons.httpclient.HttpStatus; import org.apache.commons.httpclient.NameValuePair; import org.apache.commons.httpclient.methods.GetMethod; import org.apache.commons.httpclient.methods.PostMethod; import org.apache.commons.httpclient.params.HttpMethodParams; import org.junit.Test; public class TestCase { @Test public void testGetRequest() throws IllegalStateException, IOException { HttpClient client = new HttpClient(); StringBuilder sb = new StringBuilder(); InputStream ins = null; // Create a method instance. GetMethod method = new GetMethod("http://www.baidu.com"); // Provide custom retry handler is necessary method.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, new DefaultHttpMethodRetryHandler(3, false)); try { // Execute the method. int statusCode = client.executeMethod(method); System.out.println(statusCode); if (statusCode == HttpStatus.SC_OK) { ins = method.getResponseBodyAsStream(); byte[] b = new byte[1024]; int r_len = 0; while ((r_len = ins.read(b)) > 0) { sb.append(new String(b, 0, r_len, method .getResponseCharSet())); } } else { System.err.println("Response Code: " + statusCode); } } catch (HttpException e) { System.err.println("Fatal protocol violation: " + e.getMessage()); } catch (IOException e) { System.err.println("Fatal transport error: " + e.getMessage()); } finally { method.releaseConnection(); if (ins != null) { ins.close(); } } System.out.println(sb.toString()); } @Test public void testPostRequest() throws HttpException, IOException { HttpClient client = new HttpClient(); PostMethod method = new PostMethod("http://www.baidu.com/getValue"); method.setRequestHeader("Content-Type", "application/x-www-form-urlencoded;charset=gb2312"); NameValuePair[] param = { new NameValuePair("age", "11"), new NameValuePair("name", "jay"), }; method.setRequestBody(param); int statusCode = client.executeMethod(method); System.out.println(statusCode); method.releaseConnection(); } } ~~~