Question

tomcat能找到index.jsp,找不到其他jsp网页。

tomcat能找到index.jsp,找不到其他jsp网页。路径正确，文件也存在。
但在localhost访问则一切正常。
请教这是由什么原因引起的？
先谢！

Answer 1

服务器下的WEB-INF文件夹是一个非常安全的文件,在页面中不能直接访问其中的文件,必须通过web.xml文件对要访问的文件进行相应映射才能访问。在localhost访问则一切正常是因为人家做好了映射。
参考如下资料
在企业产品的开发中，为了对资源进行保护，可把文件放在WEB-INF下,然而这样的话,访问资源需要一些策略,个人总结可采用：
一:使用jsp:forward
在页面上直接使用jsp:forward,如<jsp:forward page = "/WEB-INF/view/thinking/result.jsp" />
二：配置web.xml
Java代码
<!--设置访问资源 -->
<servlet>
<servlet-name>test</servlet-name>
<jsp-file>/WEB-INF/view/thinking/test.jsp</jsp-file>
</servlet>
<servlet-mapping>
<servlet-name>test</servlet-name>
<url-pattern>/test.jsp</url-pattern>
</servlet-mapping>

<!--设置访问资源 -->
<servlet>
<servlet-name>test</servlet-name>
<jsp-file>/WEB-INF/view/thinking/test.jsp</jsp-file>
</servlet>
<servlet-mapping>
<servlet-name>test</servlet-name>
<url-pattern>/test.jsp</url-pattern>
</servlet-mapping>

这样就可以在浏览器中输入:如:(注:D为工程名)
http://localhost:8888/D/test.jsp
这样配置只能针对单个文件,如果有多个文件需要进行保护,则配置文件显得臃肿.
三:利用拦截器
自己制作个类充当拦截器,拦截器类
Java代码
package net.cokeframework.Dispather;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class Dispather extends HttpServlet {

/**
*
*/
private static final long serialVersionUID = 1L;

static String pubInit = "";
static String selInit = "";

@Override
public void init() throws ServletException {
// TODO Auto-generated method stub
if (pubInit == "") {
pubInit = this.getServletContext().getInitParameter("root");
}
if (selInit == "") {
selInit = this.getInitParameter("child");
}
}

@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
doGet(req, resp);
}

@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
String spath=req.getServletPath();//servlet路径
String cpath=req.getContextPath(); //Context路径.
String url=req.getRequestURI();//url路径
String path=pubInit+selInit+url.substring((cpath+spath).length());//拼接请求的真正路径
//System.out.println("spath:\t"+spath+"\ncpath:\t"+cpath+"\nurl:\t"+url+"\npath:"+path);
req.getRequestDispatcher(path).forward(req, resp);
}
}

package net.cokeframework.Dispather;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class Dispather extends HttpServlet {

/**
*
*/
private static final long serialVersionUID = 1L;

static String pubInit = "";
static String selInit = "";

@Override
public void init() throws ServletException {
// TODO Auto-generated method stub
if (pubInit == "") {
pubInit = this.getServletContext().getInitParameter("root");
}
if (selInit == "") {
selInit = this.getInitParameter("child");
}
}

@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
doGet(req, resp);
}

@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
String spath=req.getServletPath();//servlet路径
String cpath=req.getContextPath(); //Context路径.
String url=req.getRequestURI();//url路径
String path=pubInit+selInit+url.substring((cpath+spath).length());//拼接请求的真正路径
//System.out.println("spath:\t"+spath+"\ncpath:\t"+cpath+"\nurl:\t"+url+"\npath:"+path);
req.getRequestDispatcher(path).forward(req, resp);
}
}

由此可见,这个拦截器也没有什么特别的,只是拼接请求的资源真正的路径,利用服务器的转发请求.
当然顺便提一下,不能使用sendRedirect,为简单的重定向,只能用于客户端上资源进行转发,不能用sendRedirect,而getRequestDispatcher,为服务器上资源之间进行转发.关于他们之间的其他区别,不是本文讨论的范围.
同时配置web.xml
Java代码
<!-- 拦截器 -->
<context-param>
<param-name>root</param-name>
<param-value>/WEB-INF</param-value>
</context-param>
<servlet>
<servlet-name>dis</servlet-name>
<servlet-class>net.cokeframework.Dispather.Dispather</servlet-class>
<init-param>
<param-name>child</param-name>
<param-value>/view</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>dis</servlet-name>
<url-pattern>/dis/*</url-pattern>
</servlet-mapping>

<!-- 拦截器 -->
<context-param>
<param-name>root</param-name>
<param-value>/WEB-INF</param-value>
</context-param>
<servlet>
<servlet-name>dis</servlet-name>
<servlet-class>net.cokeframework.Dispather.Dispather</servlet-class>
<init-param>
<param-name>child</param-name>
<param-value>/view</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>dis</servlet-name>
<url-pattern>/dis/*</url-pattern>
</servlet-mapping>

这样,就可以对view文件夹下的进行访问了,如
http://localhost:8888/D/dis/study/test.jsp
就可以访问web-inf/view/study/test.jsp.

Answer 2

.jsp 要放到能编译到的地方 ，
复制到 webroot文件夹下

Answer 3

放到webroot下面,估计你放在web-inf下面了

Answer 4

能给一下你的JSP路径和错误提示吗