如何从Java Servlet中的URL读取参数
[英]how to read parameters from URL in java servlet
问题描述
i try to read the parameters from the url in the following way http://localhost:8080/nameOfmyProject/nameOfMyServlet?query=bla 
我尝试通过以下方式从url中读取参数：http：// localhost：8080 / nameOfmyProject / nameOfMyServlet？query = bla
the code inside my doGet method is 我的doGet方法中的代码是
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String query = request.getParameter("query");
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<html>");
out.println("the parameter is " + query);
out.println("</html>");
out.close();
it builds just fine but i get an status 404. Can someone please tell me what im doing wrong? 它构建的很好，但我的状态为404。有人可以告诉我即时消息做错了什么吗？ thanks in advance! 提前致谢！
2 个解决方案
解决方案1
0 2018-11-27 20:00:40
The request.getParameter("query") will look for the input field called query in the html form. request.getParameter("query")将以html形式查找称为query的输入字段。 If you want to get the path variable from the url you get it like this 如果您想从网址中获取路径变量，则可以像这样获取它
String pathInfo = request.getPathInfo(); // query=bla
String[] pathParts = pathInfo.split("=");
String part1 = pathParts[1]; // query
String part2 = pathParts[2]; //bla
解决方案2
0 2018-11-29 09:37:37
I found the solution: it was a problem with starting the tomcat server. 我找到了解决方案：启动tomcat服务器时出现问题。 Somehow the catalina.sh had no execute permissions. catalina.sh不知何故没有执行权限。 I changed that in the cmd via: 1. i checked for permissions via ls -l 2. i changed the permissions via chmod +x catalina.sh 我通过以下方式在cmd中进行了更改：1.我通过ls -l检查了权限。我通过chmod + x catalina.sh更改了权限。
and now it works perfectly. 现在它可以完美运行了。 Thank you all! 谢谢你们！
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