1 <error-page>
2           <exception-type>com.service.Exception.MyException</exception-type>
3           <location>/my_exception.jsp</location>
4 </error-page>

<error-page><error-code>404</error-code><location>/404.html</location>
</error-page>

1 <%
2     response.setStatus(200); // 200 = HttpServletResponse.SC_OK
3 %>

  1
  2
  3 servlet = getServlet();
  4
  5           try {
  6
  7             /*
  8
  9              * (3) Service request
 10
 11              */
 12
 13             if (servlet instanceof SingleThreadModel) {
 14
 15                // sync on the wrapper so that the freshness
 16
 17                // of the page is determined right before servicing
 18
 19                synchronized (this) {
 20
 21                    servlet.service(request, response);
 22
 23                 }
 24
 25             } else {
 26
 27 //这里调用my.jsp生成的Servlet.service,执行抛出自定义的异常，最后被catch转换成JasperException
 28
 29                 servlet.service(request, response);
 30
 31             }
 32
 33
 34
 35         } catch (UnavailableException ex) {
 36
 37             String includeRequestUri = (String)
 38
 39                 request.getAttribute("javax.servlet.include.request_uri");
 40
 41             if (includeRequestUri != null) {
 42
 43                 // This file was included. Throw an exception as
 44
 45                 // a response.sendError() will be ignored by the
 46
 47                 // servlet engine.
 48
 49                 throw ex;
 50
 51             } else {
 52
 53                 int unavailableSeconds = ex.getUnavailableSeconds();
 54
 55                 if (unavailableSeconds <= 0) {
 56
 57                     unavailableSeconds = 60;        // Arbitrary default
 58
 59                 }
 60
 61                 available = System.currentTimeMillis() +
 62
 63                     (unavailableSeconds * 1000L);
 64
 65                 response.sendError
 66
 67                     (HttpServletResponse.SC_SERVICE_UNAVAILABLE,
 68
 69                      ex.getMessage());
 70
 71             }
 72
 73         } catch (ServletException ex) {
 74
 75             if(options.getDevelopment()) {
 76
 77                 throw handleJspException(ex);
 78
 79             } else {
 80
 81                 throw ex;
 82
 83             }
 84
 85         } catch (IOException ex) {
 86
 87             if(options.getDevelopment()) {
 88
 89                 throw handleJspException(ex);
 90
 91             } else {
 92
 93                 throw ex;
 94
 95             }
 96
 97         } catch (IllegalStateException ex) {
 98
 99             if(options.getDevelopment()) {
100
101                 throw handleJspException(ex);
102
103             } else {
104
105                 throw ex;
106
107             }
108
109         } catch (Exception ex) {
110
111             if(options.getDevelopment()) {
112
113                 throw handleJspException(ex);
114
115             } else {
116
117                 throw new JasperException(ex);
118
119             }
120
121         }

 1 try {
 2
 3             boolean precompile = preCompile(request);
 4
 5             serviceJspFile(request, response, jspUri, null, precompile);
 6
 7 //这里对于RuntimeException直接抛出
 8
 9         } catch (RuntimeException e) {
10
11             throw e;
12
13         } catch (ServletException e) {
14
15             throw e;
16
17         } catch (IOException e) {
18
19             throw e;
20
21         } catch (Throwable e) {
22
23             throw new ServletException(e);
24
25         }

 1 try{
 2
 3 getRequestDispatcher(“/my.jsp”).forward(request, response);
 4
 5 }catch(Exception e){
 6
 7 if(e.getCause() instanceof  MyException){
 8
 9                 response.sendRedirect(“/error.jsp”);
10
11 }
12
13 }