跨域请求，顾名思义，就是一个站点中的资源去访问另外一个不同域名站点上的资源。 资源可以是一个请求,或一个操作或一个数据流等
注:2个封装类都使用到了httpclient.jar包,请到网上搜索下载.
(一) 封装类一
/**
* 跨域请求操作类 * @author YangZhiFeng * @version 1.0 * @created 2012-8-10 上午10:56:15 */ publicclass HttpClientUtil { /** * 跨域请求并接收返回的数据 * 参数说明: url:跨域请求的地址 params:需传递的参数,格式为: 参数1=AAA&参数B=BBB&参数C=CCC * @return String * @throws IOException * @throws HttpException */ publicstatic String transboundaryRequest(String url, String params)throws HttpException, IOException { //请求方法 String response=new String(); HttpClient client =new HttpClient(); //解决乱码问题 client.getParams().setParameter(HttpMethodParams.HTTP_CONTENT_CHARSET,"UTF-8"); PostMethod method =new PostMethod(ObjectUtils.toString(url)); String[] paramList = params.split("&"); for (int i = 0; i < paramList.length; i++) { String[] param = paramList[i].split("="); if(param[0]!=""){ if(param.length>1){ method.addParameter(param[0],ObjectUtils.toString(param[1])); }else{ method.addParameter(param[0],""); } } } client.executeMethod(method); response = method.getResponseBodyAsString(); return response; }}
(二)封装类二
package com.gzedu.util;
import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.util.Iterator; import java.util.Map; import java.util.Map.Entry; import org.apache.commons.httpclient.DefaultHttpMethodRetryHandler; import org.apache.commons.httpclient.HttpClient; import org.apache.commons.httpclient.HttpException; import org.apache.commons.httpclient.methods.GetMethod; import org.apache.commons.httpclient.methods.PostMethod; import org.apache.commons.httpclient.methods.StringRequestEntity; import org.apache.commons.httpclient.params.HttpMethodParams; /** * 接口抛get/post请求 * @author xiaoming * */ publicclass HttpClientUtils { privatestatic IntegerSC_OK = 200; /** * get方式 * @param url * @param params * @param timeout * @return */ @SuppressWarnings("unchecked") publicstatic String doHttpGet(String url, Map params,int timeout, String encode) { String responseMsg =""; HttpClient httpClient =new HttpClient(); httpClient.getParams().setContentCharset(encode); StringBuffer sb =new StringBuffer(); if (params !=null && !params.isEmpty()) { Iterator iterator = params.entrySet().iterator(); while (iterator.hasNext()) { Entry entry = (Entry) iterator.next(); sb.append(entry.getKey().toString() +"=" + entry.getValue().toString() +"&"); } url = url +"?" + sb.substring(0, sb.length()-1); } GetMethod getMethod =new GetMethod(url); getMethod.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, new DefaultHttpMethodRetryHandler()); try { httpClient.getHttpConnectionManager().getParams() .setConnectionTimeout(timeout); int num = httpClient.executeMethod(getMethod); if (num ==SC_OK) { InputStream is = getMethod.getResponseBodyAsStream(); BufferedReader br =new BufferedReader(new InputStreamReader(is)); String tempbf; StringBuffer html=new StringBuffer(1000); while((tempbf=br.readLine())!=null){ html.append(tempbf); } responseMsg = html.toString(); } } catch (Exception e) { e.printStackTrace(); } finally { getMethod.releaseConnection(); } return responseMsg; } /** * post方式 * @param url * @param params * @param timeout * @return */ @SuppressWarnings("unchecked") publicstatic String doHttpPost(String url, Map params,int timeout, String encode) { String responseMsg =""; HttpClient httpClient =new HttpClient(); httpClient.getParams().setContentCharset(encode); PostMethod postMethod =new PostMethod(url); if (params !=null && !params.isEmpty()) { Iterator iterator = params.entrySet().iterator(); while (iterator.hasNext()) { Entry entry = (Entry) iterator.next(); postMethod.addParameter(entry.getKey().toString(), entry .getValue().toString()); } } try { httpClient.getHttpConnectionManager().getParams() .setConnectionTimeout(timeout); int num = httpClient.executeMethod(postMethod); if (num ==SC_OK) { InputStream is = postMethod.getResponseBodyAsStream(); BufferedReader br =new BufferedReader(new InputStreamReader(is)); String tempbf; StringBuffer html=new StringBuffer(1000); while((tempbf=br.readLine())!=null){ html.append(tempbf); } responseMsg = html.toString(); } } catch (Exception e) { e.printStackTrace(); } finally { postMethod.releaseConnection(); } return responseMsg; } /*** * 发送xml文件 * @param url * @param xml * @param timeout * @param encode * @return */ publicstatic String doHttpPostXml(String url, String xmlString,int timeout, String encode){ String responseString =""; HttpClient httpClient =new HttpClient(); httpClient.getHttpConnectionManager().getParams().setConnectionTimeout(timeout); PostMethod postMethod =new PostMethod(url); try { postMethod.setRequestHeader("Content-Type","text/xml,charset="+encode); postMethod.setRequestEntity(new StringRequestEntity(xmlString,"text/xml",encode)); int statusCode = httpClient.executeMethod(postMethod); if(statusCode ==SC_OK){ InputStream is = postMethod.getResponseBodyAsStream(); BufferedReader br =new BufferedReader(new InputStreamReader(is)); String tempbf; StringBuffer html=new StringBuffer(1000); while((tempbf=br.readLine())!=null){ html.append(tempbf); } responseString = html.toString(); } } catch (HttpException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return responseString; } }