cod*_*rix 24 java tomcat servlets header
我是servlet开发的新手,我正在阅读电子书,发现我可以使用重定向到不同的网页
setHeader("Location", "http://www.google.com")
但这不起作用,因为我已将此代码编写为:
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class ModHelloWorld extends HttpServlet{
public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException{
// response.addHeader("Location", "http://www.google.com");
response.setHeader("Location", "http://www.google.com");
response.setContentType("text/html");
PrintWriter pw = response.getWriter();
pw.println("<html><head><title>Modified Hello World</title></head><body>");
pw.println("<h1>");
//getInitParameter function reads the contents ot init-param elements.
pw.println(getInitParameter("message"));
pw.println("</h1>");
pw.println("</body></html>");
pw.close();
}
}
我已经使用我的程序检查了标题以获取网页的标题,如下所示:
import java.net.*;
import java.io.*;
class getHeaders{
public static void main(String args[]){
URL url = null;
URLConnection urc = null;
try {
url = new URL(args[0]);
urc = url.openConnection();
for(int i=0 ; ; i++) {
String name = urc.getHeaderFieldKey(i);
String value = urc.getHeaderField(i);
if(name == null && value == null)//both null so end of header
break;
else if(name == null){//first line of header{
System.out.println("Server HTTP version, Response code: ");
System.out.println(value);
System.out.println("ENd of first header field");
} else {
System.out.println("name of header is: " + name + " and its value is : " + value);
}
}
} catch(MalformedURLException e){
System.out.println("Malformed URL " + e.getMessage());
} catch(IOException e){
e.printStackTrace();
}
}
}
我得到的输出为:
Server HTTP version, Response code:
HTTP/1.1 200 OK
ENd of first header field
name of header is: Server and its value is : Apache-Coyote/1.1
name of header is: Location and its value is : http://www.google.com
name of header is: Content-Type and its value is : text/html
name of header is: Content-Length and its value is : 101
name of header is: Date and its value is : Sat, 05 Mar 2011 15:27:29 GMT
但我没有从浏览器重定向到谷歌的页面.
提前致谢:)
ada*_*shr 69
哦不,不!这不是你重定向的方式.它更简单:
public class ModHelloWorld extends HttpServlet{
public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException{
response.sendRedirect("http://www.google.com");
}
}
此外,在servlet中编写HTML代码是一种不好的做法.您应该考虑将所有标记放入JSP并使用以下方法调用JSP:
response.sendRedirect("/path/to/mynewpage.jsp");
cas*_*nca 21
如您所见,响应仍然存在HTTP/1.1 200 OK.要指示重定向,您需要发回302状态代码:
response.setStatus(HttpServletResponse.SC_FOUND); // SC_FOUND = 302
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