servlet中出现的HTTP Status 404问题

显示全部楼层 · 2021-1-27 06:41:09

java小白，最近刚学servlet，想问问为什么出现HTTPStatus404，实在想不出问题出在哪里，在这先谢谢各位吴彦祖了。
web.xml文件代码

ok
com.yang.test.Show

ok
/show

jsp页面代码

输入字符串，提交给servlet(post方式):

输入字符串，提交给servlet(Get方式):

servlet代码
packagecom.yang.test;
importjava.io.IOException;
importjava.io.PrintWriter;
importjavax.servlet.ServletConfig;
importjavax.servlet.ServletException;
importjavax.servlet.http.HttpServlet;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;

publicclassShowextendsHttpServlet{
publicvoidinit(ServletConfigconfig)throwsServletException{
super.init(config);
}
publicvoiddoPost(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{
response.setContentType("text/html;charset=GB2312");
PrintWriterout=response.getWriter();
out.println("");
Strings=request.getParameter("str");
bytebb[]=s.getBytes("iso-8859-1");
s=newString(bb);
intn=s.length();
out.print("\""+s+"\""+"的长度:"+n+"
");
out.println("");
}
publicvoiddoGet(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{
doPost(request,response);
response.setContentType("text/html;charset=GB2312");
PrintWriterout=response.getWriter();
out.println("");
Strings=request.getParameter("str");
bytebb[]=s.getBytes("iso-8859-1");
s=newString(bb);
if(s.startsWith("Hello"))
out.print("\""+s+"\""+"的前缀是:Hello");
else
out.print("\""+s+"\""+"的前缀不是:Hello");
out.println("");
}
}
分 -->

千问 · 2021-1-27 06:41:09

404就是浏览器地址错误

千问 · 2021-1-27 06:41:09

show"method="post">
表单action属性更改为这句试一下

千问 · 2021-1-27 06:41:09

404请求url有问题，F12查看下url比对一下