java后台如何调用其他地址的SERVLET 比如 我后台需要调用下面的SERVLEThttp://xxx.xxx.xxx.xxx:8080/xxx/xxxJAVA 后台 怎么写 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 这个调用是指啥? RequestDispatcher.forward() 直接跳转过去?还是想把该URL的内容抓出来另外处理?如果是后者,可以用 new URL("http://xxx.xxx.xxx.xxx:8080/xxx/xxx").getConnection();如果还需要POST参数过去,可以用开源的HTTPClient组件,来完整模拟整个浏览器提交的动作。 就是 我JAVA后台 去 请求 另一个 服务器上面 SERVLET 地址需要有参数的 直接XXServlet 如果传参的话 XXServlet?username=XX 和浏览器访问servlet一样 不是跳转 就是 我后台 去触发一下 另一个 机器 的 SERVLET 就行了 就用HTTP请求 发送?类似这个 ?/** * 发送HTTP请求 * * @param urlString * @return 响映对象 * @throws IOException */ private HttpRespons send(String urlString, String method, Map<String, String> parameters, Map<String, String> propertys) throws IOException { HttpURLConnection urlConnection = null; if (method.equalsIgnoreCase("GET") && parameters != null) { StringBuffer param = new StringBuffer(); int i = 0; for (String key : parameters.keySet()) { if (i == 0) param.append("?"); else param.append("&"); param.append(key).append("=").append(parameters.get(key)); i++; } urlString += param; } URL url = new URL(urlString); urlConnection = (HttpURLConnection) url.openConnection(); urlConnection.setRequestMethod(method); urlConnection.setDoOutput(true); urlConnection.setDoInput(true); urlConnection.setUseCaches(false); if (propertys != null) for (String key : propertys.keySet()) { urlConnection.addRequestProperty(key, propertys.get(key)); } if (method.equalsIgnoreCase("POST") && parameters != null) { StringBuffer param = new StringBuffer(); for (String key : parameters.keySet()) { param.append("&"); param.append(key).append("=").append(parameters.get(key)); } urlConnection.getOutputStream().write(param.toString().getBytes()); urlConnection.getOutputStream().flush(); urlConnection.getOutputStream().close(); } return this.makeContent(urlString, urlConnection); } /** * 得到响应对象 * * @param urlConnection * @return 响应对象 * @throws IOException */ private HttpRespons makeContent(String urlString, HttpURLConnection urlConnection) throws IOException { HttpRespons httpResponser = new HttpRespons(); try { InputStream in = urlConnection.getInputStream(); BufferedReader bufferedReader = new BufferedReader( new InputStreamReader(in)); httpResponser.contentCollection = new Vector<String>(); StringBuffer temp = new StringBuffer(); String line = bufferedReader.readLine(); while (line != null) { httpResponser.contentCollection.add(line); temp.append(line).append("\r\n"); line = bufferedReader.readLine(); } bufferedReader.close(); String ecod = urlConnection.getContentEncoding(); if (ecod == null) ecod = this.defaultContentEncoding; httpResponser.urlString = urlString; httpResponser.defaultPort = urlConnection.getURL().getDefaultPort(); httpResponser.file = urlConnection.getURL().getFile(); httpResponser.host = urlConnection.getURL().getHost(); httpResponser.path = urlConnection.getURL().getPath(); httpResponser.port = urlConnection.getURL().getPort(); httpResponser.protocol = urlConnection.getURL().getProtocol(); httpResponser.query = urlConnection.getURL().getQuery(); httpResponser.ref = urlConnection.getURL().getRef(); httpResponser.userInfo = urlConnection.getURL().getUserInfo(); httpResponser.content = new String(temp.toString().getBytes(), ecod); httpResponser.contentEncoding = ecod; httpResponser.code = urlConnection.getResponseCode(); httpResponser.message = urlConnection.getResponseMessage(); httpResponser.contentType = urlConnection.getContentType(); httpResponser.method = urlConnection.getRequestMethod(); httpResponser.connectTimeout = urlConnection.getConnectTimeout(); httpResponser.readTimeout = urlConnection.getReadTimeout(); return httpResponser; } catch (IOException e) { throw e; } finally { if (urlConnection != null) urlConnection.disconnect(); } } 对,就是类似你5楼的代码,不过如果只是个触发而不需要POST参数的话,不需要这么写的这么复杂HttpURLConnection cn = new URL("http://xxx.xxx.xxx.xxx:8080/xxx/xxx").getConnection();cn.getInputStream(); // 把InputStream读完,看看有没有报错就行了。 一个关于搜索的问题,忘高手指教 js问题 jsp页面权限 JSP 为啥总是遇到这样的错误 大神们 struts文件上传乱码问题 求赐教!!! Spring+Sql Server数据库表设计问题 如何读取系统的内存使用情况以及CPU利用情况? 学习模式设计或struts之前需要什么样的知识和功底! 十面埋伏有效期三天大家快看 一个jar的容易问题,当然我不觉得容易,我查不到答案 讨论数据缓冲池 一台内网机器WEB服务做成内外网都能同时访问
需要有参数的
类似这个 ?
/**
* 发送HTTP请求
*
* @param urlString
* @return 响映对象
* @throws IOException
*/
private HttpRespons send(String urlString, String method,
Map<String, String> parameters, Map<String, String> propertys)
throws IOException {
HttpURLConnection urlConnection = null;
if (method.equalsIgnoreCase("GET") && parameters != null) {
StringBuffer param = new StringBuffer();
int i = 0;
for (String key : parameters.keySet()) {
if (i == 0)
param.append("?");
else
param.append("&");
param.append(key).append("=").append(parameters.get(key));
i++;
}
urlString += param;
}
URL url = new URL(urlString);
urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setRequestMethod(method);
urlConnection.setDoOutput(true);
urlConnection.setDoInput(true);
urlConnection.setUseCaches(false);
if (propertys != null)
for (String key : propertys.keySet()) {
urlConnection.addRequestProperty(key, propertys.get(key));
}
if (method.equalsIgnoreCase("POST") && parameters != null) {
StringBuffer param = new StringBuffer();
for (String key : parameters.keySet()) {
param.append("&");
param.append(key).append("=").append(parameters.get(key));
}
urlConnection.getOutputStream().write(param.toString().getBytes());
urlConnection.getOutputStream().flush();
urlConnection.getOutputStream().close();
}
return this.makeContent(urlString, urlConnection);
}
/**
* 得到响应对象
*
* @param urlConnection
* @return 响应对象
* @throws IOException
*/
private HttpRespons makeContent(String urlString,
HttpURLConnection urlConnection) throws IOException {
HttpRespons httpResponser = new HttpRespons();
try {
InputStream in = urlConnection.getInputStream();
BufferedReader bufferedReader = new BufferedReader(
new InputStreamReader(in));
httpResponser.contentCollection = new Vector<String>();
StringBuffer temp = new StringBuffer();
String line = bufferedReader.readLine();
while (line != null) {
httpResponser.contentCollection.add(line);
temp.append(line).append("\r\n");
line = bufferedReader.readLine();
}
bufferedReader.close();
String ecod = urlConnection.getContentEncoding();
if (ecod == null)
ecod = this.defaultContentEncoding;
httpResponser.urlString = urlString;
httpResponser.defaultPort = urlConnection.getURL().getDefaultPort();
httpResponser.file = urlConnection.getURL().getFile();
httpResponser.host = urlConnection.getURL().getHost();
httpResponser.path = urlConnection.getURL().getPath();
httpResponser.port = urlConnection.getURL().getPort();
httpResponser.protocol = urlConnection.getURL().getProtocol();
httpResponser.query = urlConnection.getURL().getQuery();
httpResponser.ref = urlConnection.getURL().getRef();
httpResponser.userInfo = urlConnection.getURL().getUserInfo();
httpResponser.content = new String(temp.toString().getBytes(), ecod);
httpResponser.contentEncoding = ecod;
httpResponser.code = urlConnection.getResponseCode();
httpResponser.message = urlConnection.getResponseMessage();
httpResponser.contentType = urlConnection.getContentType();
httpResponser.method = urlConnection.getRequestMethod();
httpResponser.connectTimeout = urlConnection.getConnectTimeout();
httpResponser.readTimeout = urlConnection.getReadTimeout();
return httpResponser;
} catch (IOException e) {
throw e;
} finally {
if (urlConnection != null)
urlConnection.disconnect();
}
}
cn.getInputStream(); // 把InputStream读完,看看有没有报错就行了。