HttpClient使用：
maven:
<!-- https://mvnrepository.com/artifact/org.apache.httpcomponents/httpclient --> <dependency> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpclient</artifactId> <version>4.5.3</version> </dependency>
code:
package com.qhong.http; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.apache.commons.httpclient.*; import org.apache.commons.httpclient.auth.AuthScope; import org.apache.commons.httpclient.methods.PostMethod; import org.apache.commons.httpclient.methods.GetMethod; import java.util.Iterator; import java.util.Map; import java.net.SocketTimeoutException; import java.io.BufferedReader; import java.io.InputStreamReader; public class HttpInvoker { private Log logger = LogFactory.getLog(HttpInvoker.class); private static HttpInvoker httpInvoker = new HttpInvoker(); private HttpClient client = null; private String charset ="utf-8"; private int timeout = 10000; private boolean useProxy = false; private String proxyHost = null; private int proxyPort; private String proxyUsername = null; private String proxyPassword = null; private boolean initialized = false; public static HttpInvoker getInstance() { return httpInvoker; } private HttpInvoker() { client = new HttpClient(new MultiThreadedHttpConnectionManager()); client.getParams().setParameter("http.protocol.content-charset", "utf-8"); client.getParams().setContentCharset("utf-8"); client.getParams().setSoTimeout(timeout); } public HttpInvoker(String charset, int timeout, boolean useProxy, String proxyHost, int proxyPort, String proxyUsername, String proxyPassword) { client = new HttpClient(new MultiThreadedHttpConnectionManager()); if(charset != null && !charset.trim().equals("")) { this.charset = charset; } if(timeout > 0) { this.timeout = timeout; } client.getParams().setParameter("http.protocol.content-charset", charset); client.getParams().setContentCharset(charset); client.getParams().setSoTimeout(timeout); if(useProxy && proxyHost != null && !proxyHost.trim().equals("") && proxyPort > 0) { HostConfiguration hc = new HostConfiguration(); hc.setProxy(proxyHost, proxyPort); client.setHostConfiguration(hc); if (proxyUsername != null && !proxyUsername.trim().equals("") && proxyPassword != null && !proxyPassword.trim().equals("")) { client.getState().setProxyCredentials(AuthScope.ANY, new UsernamePasswordCredentials(proxyUsername, proxyPassword)); } } initialized = true; logger.debug("HttpInvoker初始化完成"); } public synchronized void init() { if(charset != null && !charset.trim().equals("")) { client.getParams().setParameter("http.protocol.content-charset", charset); client.getParams().setContentCharset(charset); } if(timeout > 0) { client.getParams().setSoTimeout(timeout); } if(useProxy && proxyHost != null && !proxyHost.trim().equals("") && proxyPort > 0) { HostConfiguration hc = new HostConfiguration(); hc.setProxy(proxyHost, proxyPort); client.setHostConfiguration(hc); if (proxyUsername != null && !proxyUsername.trim().equals("") && proxyPassword != null && !proxyPassword.trim().equals("")) { client.getState().setProxyCredentials(AuthScope.ANY, new UsernamePasswordCredentials(proxyUsername, proxyPassword)); } } initialized = true; logger.debug("HttpInvoker初始化完成"); } public String invoke(String url) throws Exception { return invoke(url, null, false); } public String invoke(String url, Map params, boolean isPost) throws Exception { logger.debug("HTTP调用[" + (isPost?"POST":"GET") + "][" + url + "][" + params + "]"); HttpMethod httpMethod = null; String result = ""; try { if(isPost && params != null && params.size() > 0) { Iterator paramKeys = params.keySet().iterator(); httpMethod = new PostMethod(url); NameValuePair[] form = new NameValuePair[params.size()]; int formIndex = 0; while(paramKeys.hasNext()) { String key = (String)paramKeys.next(); Object value = params.get(key); if(value != null && value instanceof String && !value.equals("")) { form[formIndex] = new NameValuePair(key, (String)value); formIndex++; } else if(value != null && value instanceof String[] && ((String[])value).length > 0) { NameValuePair[] tempForm = new NameValuePair[form.length + ((String[])value).length - 1]; for(int i=0; i<formIndex; i++) { tempForm[i] = form[i]; } form = tempForm; for(String v : (String[])value) { form[formIndex] = new NameValuePair(key, (String)v); formIndex++; } } } ((PostMethod)httpMethod).setRequestBody(form); } else { if(params != null && params.size() > 0) { Iterator paramKeys = params.keySet().iterator(); StringBuffer getUrl = new StringBuffer(url.trim()); if(url.trim().indexOf("?") > -1) { if(url.trim().indexOf("?") < url.trim().length()-1 && url.trim().indexOf("&") < url.trim().length()-1) { getUrl.append("&"); } } else { getUrl.append("?"); } while(paramKeys.hasNext()) { String key = (String)paramKeys.next(); Object value = params.get(key); if(value != null && value instanceof String && !value.equals("")) { getUrl.append(key).append("=").append(value).append("&"); } else if(value != null && value instanceof String[] && ((String[])value).length > 0) { for(String v : (String[])value) { getUrl.append(key).append("=").append(v).append("&"); } } } if(getUrl.lastIndexOf("&") == getUrl.length()-1) { httpMethod = new GetMethod(getUrl.substring(0, getUrl.length()-1)); } else { httpMethod = new GetMethod(getUrl.toString()); } } else { httpMethod = new GetMethod(url); } } client.executeMethod(httpMethod); // result = httpMethod.getResponseBodyAsString(); BufferedReader reader = new BufferedReader(new InputStreamReader( httpMethod.getResponseBodyAsStream(),"utf-8")); String line = null; String html = null; while((line = reader.readLine()) != null){ if(html == null) { html = ""; } else { html += " "; } html += line; } if(html != null) { result = new String(html.getBytes("utf-8"), charset); } } catch (SocketTimeoutException e) { logger.error("连接超时[" + url + "]"); throw e; } catch (java.net.ConnectException e) { logger.error("连接失败[" + url + "]"); throw e; } catch (Exception e) { logger.error("连接时出现异常[" + url + "]"); throw e; } finally { if (httpMethod != null) { try { httpMethod.releaseConnection(); } catch (Exception e) { logger.error("释放网络连接失败[" + url + "]"); throw e; } } } return result; } public void setCharset(String charset) { this.charset = charset; } public void setTimeout(int timeout) { this.timeout = timeout; } public void setProxyHost(String proxyHost) { this.proxyHost = proxyHost; } public void setProxyPort(int proxyPort) { this.proxyPort = proxyPort; } public void setProxyUsername(String proxyUsername) { this.proxyUsername = proxyUsername; } public void setProxyPassword(String proxyPassword) { this.proxyPassword = proxyPassword; } public void setUseProxy(boolean useProxy) { this.useProxy = useProxy; } public synchronized boolean isInitialized() { return initialized; } }
test:
package com.qhong.http; import java.util.HashMap; import java.util.Map; public class test { public static void main(String[] args) throws Exception{ HttpInvoker httpInvoker=HttpInvoker.getInstance(); //Get String content = httpInvoker.invoke("http://www.baidu.com"); System.out.println(content); //Post Map<String,String> params=new HashMap<String,String>(); params.put("a","testDFRZW952"); params.put("na","Zn+4A+yXAfrT847NjCToRg=="); params.put("pe","sFt/8rWLN1F+Fd8RTnc9eA=="); params.put("pv","上海市"); params.put("cy","上海"); params.put("la","120000"); String url="http://jwebplat.momead.com/d/call/info"; String content2=httpInvoker.invoke(url,params,true); System.out.println(content2); } }
上面test中的map参数，在请求体中的显示为：
a=testDFRZW952&na=Zn%2B4A%2ByXAfrT847NjCToRg%3D%3D&pe=sFt%2F8rWLN1F%2BFd8RTnc9eA%3D%3D&la=120000&pv=%E4%B8%8A%E6%B5%B7%E5%B8%82&cy=%E4%B8%8A%E6%B5%B7
如果想使用json方式请求，这个工具类还不合适
package com.qhong.http; import net.sf.json.JSONObject; import org.apache.commons.httpclient.HttpStatus; import org.apache.http.HttpResponse; import org.apache.http.client.methods.HttpGet; import org.apache.http.client.methods.HttpPost; import org.apache.http.entity.StringEntity; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.util.EntityUtils; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import java.io.IOException; import java.net.URLDecoder; public class HttpRequestUtils { private static Logger logger = LoggerFactory.getLogger(HttpRequestUtils.class); //日志记录 /** * httpPost * * @param url 路径 * @param jsonParam 参数 * @return */ public static JSONObject httpPost(String url, JSONObject jsonParam) { return httpPost(url, jsonParam, false); } /** * post请求 * * @param url url地址 * @param jsonParam 参数 * @param noNeedResponse 不需要返回结果 * @return */ public static JSONObject httpPost(String url, JSONObject jsonParam, boolean noNeedResponse) { //post请求返回结果 DefaultHttpClient httpClient = new DefaultHttpClient(); JSONObject jsonResult = null; HttpPost method = new HttpPost(url); try { if (null != jsonParam) { //解决中文乱码问题 StringEntity entity = new StringEntity(jsonParam.toString(), "utf-8"); entity.setContentEncoding("UTF-8"); entity.setContentType("application/json"); method.setEntity(entity); } HttpResponse result = httpClient.execute(method); url = URLDecoder.decode(url, "UTF-8"); /**请求发送成功，并得到响应**/ if (result.getStatusLine().getStatusCode() == 200) { String str = ""; try { /**读取服务器返回过来的json字符串数据**/ str = EntityUtils.toString(result.getEntity()); if (noNeedResponse) { return null; } /**把json字符串转换成json对象**/ jsonResult = JSONObject.fromObject(str); } catch (Exception e) { logger.error("post请求提交失败:" + url, e); } } } catch (IOException e) { logger.error("post请求提交失败:" + url, e); } return jsonResult; } /** * 发送get请求 * * @param url 路径 * @return */ public static JSONObject httpGet(String url) { //get请求返回结果 JSONObject jsonResult = null; try { DefaultHttpClient client = new DefaultHttpClient(); //发送get请求 HttpGet request = new HttpGet(url); HttpResponse response = client.execute(request); /**请求发送成功，并得到响应**/ if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) { /**读取服务器返回过来的json字符串数据**/ String strResult = EntityUtils.toString(response.getEntity()); /**把json字符串转换成json对象**/ jsonResult = JSONObject.fromObject(strResult); url = URLDecoder.decode(url, "UTF-8"); } else { logger.error("get请求提交失败:" + url); } } catch (IOException e) { logger.error("get请求提交失败:" + url, e); } return jsonResult; } }
http://www.cnblogs.com/ITtangtang/p/3968093.html