我有一个 HttpServletRequest
对象。
如何获取完整和精确的 URL,以导致此调用到达我的 Servlet?
或者至少尽可能准确地获取,因为有些东西可以重新生成(例如参数的顺序)。
HttpServletRequest
有以下方法:
getRequestURL()
- 返回查询字符串分隔符?
之前的完整URL。getQueryString()
- 返回查询字符串分隔符?
之后的完整URL。因此,要获取完整URL,只需执行:
public static String getFullURL(HttpServletRequest request) {
StringBuilder requestURL = new StringBuilder(request.getRequestURL().toString());
String queryString = request.getQueryString();
if (queryString == null) {
return requestURL.toString();
} else {
return requestURL.append('?').append(queryString).toString();
}
}
我使用这种方法:
public static String getURL(HttpServletRequest req) {
String scheme = req.getScheme(); // http
String serverName = req.getServerName(); // hostname.com
int serverPort = req.getServerPort(); // 80
String contextPath = req.getContextPath(); // /mywebapp
String servletPath = req.getServletPath(); // /servlet/MyServlet
String pathInfo = req.getPathInfo(); // /a/b;c=123
String queryString = req.getQueryString(); // d=789
// Reconstruct original requesting URL
StringBuilder url = new StringBuilder();
url.append(scheme).append("://").append(serverName);
if (serverPort != 80 && serverPort != 443) {
url.append(":").append(serverPort);
}
url.append(contextPath).append(servletPath);
if (pathInfo != null) {
url.append(pathInfo);
}
if (queryString != null) {
url.append("?").append(queryString);
}
return url.toString();
}
url
仅在该方法内声明、实例化和使用,所以它不能从调用该方法的线程之外的线程访问。 - Diogo KollrossStringBuffer
实例,并且没有与任何其他线程共享它。这应该更改为StringBuilder
。 - GraygetRequestURI
的理由? - Christophe Roussy在Spring项目中,你可以使用
UriComponentsBuilder.fromHttpRequest(new ServletServerHttpRequest(request)).build().toUriString()
new ServletServerHttpRequest(request).getURI()
- Matt Sidesinger// http://hostname.com/mywebapp/servlet/MyServlet/a/b;c=123?d=789
public static String getUrl(HttpServletRequest req) {
String reqUrl = req.getRequestURL().toString();
String queryString = req.getQueryString(); // d=789
if (queryString != null) {
reqUrl += "?"+queryString;
}
return reqUrl;
}
StringBuffer
的优势。 - BalusCHttpUtil已被弃用,这是正确的方法
StringBuffer url = req.getRequestURL();
String queryString = req.getQueryString();
if (queryString != null) {
url.append('?');
url.append(queryString);
}
String requestURL = url.toString();
通过结合使用getRequestURL()
和getQueryString()
的结果,可以获得所需的结果。
.getRequestURL()
的StringBuffer构建器模式:private String getUrlWithQueryParms(final HttpServletRequest request) {
return request.getQueryString() == null ? request.getRequestURL().toString() :
request.getRequestURL().append("?").append(request.getQueryString()).toString();
}
@Override
public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2) throws IOException, ServletException {
HttpServletRequest test1= (HttpServletRequest) arg0;
test1.getRequestURL()); it gives http://localhost:8081/applicationName/menu/index.action
test1.getRequestURI()); it gives applicationName/menu/index.action
String pathname = test1.getServletPath()); it gives //menu/index.action
if(pathname.equals("//menu/index.action")){
arg2.doFilter(arg0, arg1); // call to urs servlet or frameowrk managed controller method
// in resposne
HttpServletResponse httpResp = (HttpServletResponse) arg1;
RequestDispatcher rd = arg0.getRequestDispatcher("another.jsp");
rd.forward(arg0, arg1);
}
<dispatcher>FORWARD</dispatcher>
。我有一个使用案例,需要从httpServletRequest实例生成cURL命令(我可以在终端中使用)。 我创建了一个像这样的方法。 您可以直接复制此方法的输出并在终端中使用。
private StringBuilder generateCURL(final HttpServletRequest httpServletRequest) {
final StringBuilder curlCommand = new StringBuilder();
curlCommand.append("curl ");
// iterating over headers.
for (Enumeration<?> e = httpServletRequest.getHeaderNames(); e.hasMoreElements();) {
String headerName = (String) e.nextElement();
String headerValue = httpServletRequest.getHeader(headerName);
// skipping cookies, as we're appending cookies separately.
if (Objects.equals(headerName, "cookie")) {
continue;
}
if (headerName != null && headerValue != null) {
curlCommand.append(String.format(" -H \"%s:%s\" ", headerName, headerValue));
}
}
// iterating over cookies.
final Cookie[] cookieArray = httpServletRequest.getCookies();
final StringBuilder cookies = new StringBuilder();
for (Cookie cookie : cookieArray) {
if (cookie.getName() != null && cookie.getValue() != null) {
cookies.append(cookie.getName());
cookies.append('=');
cookies.append(cookie.getValue());
cookies.append("; ");
}
}
curlCommand.append(" --cookie \"" + cookies.toString() + "\"");
// appending request url.
curlCommand.append(" \"" + httpServletRequest.getRequestURL().toString() + "\"");
return curlCommand;
}