Java的7个动作指令

最新推荐文章于 2025-06-27 18:28:49 发布

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最新推荐文章于 2025-06-27 18:28:49 发布

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分类专栏： Java EE学习笔记

本文链接：https://blog.youkuaiyun.com/stubbornying/article/details/52693488

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6 篇文章

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1.测试jsp动作指令 forward, include以及编译指令include

<jsp:forward ...>:

原代码：

jsp-forward.jsp

<body>
	hello
	<jsp:forward page="forward-result.jsp">
		<jsp:param value="26" name="age"/>
	</jsp:forward>
</body>

forward-result.jsp

<body>
	<%=request.getParameter("age") %>
</body>

测试结果图：

转换后对应的servlet文件：

public void _jspService(final javax.servlet.http.HttpServletRequest request, final javax.servlet.http.HttpServletResponse response)
        throws java.io.IOException, javax.servlet.ServletException {

final java.lang.String _jspx_method = request.getMethod();
if (!"GET".equals(_jspx_method) && !"POST".equals(_jspx_method) && !"HEAD".equals(_jspx_method) && !javax.servlet.DispatcherType.ERROR.equals(request.getDispatcherType())) {
response.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED, "JSPs only permit GET POST or HEAD");
return;
}

    final javax.servlet.jsp.PageContext pageContext;
    javax.servlet.http.HttpSession session = null;
    final javax.servlet.ServletContext application;
    final javax.servlet.ServletConfig config;
    javax.servlet.jsp.JspWriter out = null;
    final java.lang.Object page = this;
    javax.servlet.jsp.JspWriter _jspx_out = null;
    javax.servlet.jsp.PageContext _jspx_page_context = null;


    try {
      response.setContentType("text/ht;charset=GBK");
      pageContext = _jspxFactory.getPageContext(this, request, response,
      			"", true, 8192, true);
      _jspx_page_context = pageContext;
      application = pageContext.getServletContext();
      config = pageContext.getServletConfig();
      session = pageContext.getSession();
      out = pageContext.getOut();
      _jspx_out = out;

      out.write("\r\n");
      out.write("<html>\r\n");
      out.write("<head>\r\n");
      out.write("\t<title>jsp-forward</title>\r\n");
      out.write("</head>\r\n");
      out.write("<body>\r\n");
      out.write("\thello\r\n");
      out.write("\t");
      if (true) {
        _jspx_page_context.forward("forward-result.jsp" + "?" + org.apache.jasper.runtime.JspRuntimeLibrary.URLEncode("age", request.getCharacterEncoding())+ "=" + org.apache.jasper.runtime.JspRuntimeLibrary.URLEncode("26", request.getCharacterEncoding()));
        return;
      }
      out.write("\r\n");
      out.write("</body>\r\n");
      out.write("</html>");
    } catch (java.lang.Throwable t) {
      if (!(t instanceof javax.servlet.jsp.SkipPageException)){
        out = _jspx_out;
        if (out != null && out.getBufferSize() != 0)
          try {
            if (response.isCommitted()) {
              out.flush();
            } else {
              out.clearBuffer();
            }
          } catch (java.io.IOException e) {}
        if (_jspx_page_context != null) _jspx_page_context.handlePageException(t);
        else throw new ServletException(t);
      }
    } finally {
      _jspxFactory.releasePageContext(_jspx_page_context);
    }
  }

      out.write("\r\n");
      out.write("<html>\r\n");
      out.write("<head>\r\n");
      out.write("\t<title>forward-result</title>\r\n");
      out.write("</head>\r\n");
      out.write("<body>\r\n");
      out.write("\t");
      out.print(request.getParameter("age") );
      out.write("\r\n");
      out.write("</body>\r\n");
      out.write("</html>\r\n");

<jsp:include ...>:

原代码：

jsp-include.jsp

<body>
	hello, welcome to the page "jsp-include.jsp"
	<jsp:include page="forward-result.jsp">
		<jsp:param value="26" name="age"/>
	</jsp:include>
</body>

测试结果图：

转换后对应的servlet文件：

  public void _jspService(final javax.servlet.http.HttpServletRequest request, final javax.servlet.http.HttpServletResponse response)
        throws java.io.IOException, javax.servlet.ServletException {

final java.lang.String _jspx_method = request.getMethod();
if (!"GET".equals(_jspx_method) && !"POST".equals(_jspx_method) && !"HEAD".equals(_jspx_method) && !javax.servlet.DispatcherType.ERROR.equals(request.getDispatcherType())) {
response.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED, "JSPs only permit GET POST or HEAD");
return;
}

    final javax.servlet.jsp.PageContext pageContext;
    javax.servlet.http.HttpSession session = null;
    final javax.servlet.ServletContext application;
    final javax.servlet.ServletConfig config;
    javax.servlet.jsp.JspWriter out = null;
    final java.lang.Object page = this;
    javax.servlet.jsp.JspWriter _jspx_out = null;
    javax.servlet.jsp.PageContext _jspx_page_context = null;


    try {
      response.setContentType("text/html; charset=GBK");
      pageContext = _jspxFactory.getPageContext(this, request, response,
      			null, true, 8192, true);
      _jspx_page_context = pageContext;
      application = pageContext.getServletContext();
      config = pageContext.getServletConfig();
      session = pageContext.getSession();
      out = pageContext.getOut();
      _jspx_out = out;

      out.write("\r\n");
      out.write("<html>\r\n");
      out.write("<head>\r\n");
      out.write("<title>jsp-include</title>\r\n");
      out.write("</head>\r\n");
      out.write("<body>\r\n");
      out.write("\thello, welcome to the page \"jsp-include.jsp\"\r\n");
      out.write("\t");
      org.apache.jasper.runtime.JspRuntimeLibrary.include(request, response, "forward-result.jsp" + "?" + org.apache.jasper.runtime.JspRuntimeLibrary.URLEncode("age", request.getCharacterEncoding())+ "=" + org.apache.jasper.runtime.JspRuntimeLibrary.URLEncode("26", request.getCharacterEncoding()), out, false);
      out.write("\r\n");
      out.write("</body>\r\n");
      out.write("</html>\r\n");
    } catch (java.lang.Throwable t) {
      if (!(t instanceof javax.servlet.jsp.SkipPageException)){
        out = _jspx_out;
        if (out != null && out.getBufferSize() != 0)
          try {
            if (response.isCommitted()) {
              out.flush();
            } else {
              out.clearBuffer();
            }
          } catch (java.io.IOException e) {}
        if (_jspx_page_context != null) _jspx_page_context.handlePageException(t);
        else throw new ServletException(t);
      }
    } finally {
      _jspxFactory.releasePageContext(_jspx_page_context);
    }
  }

<%@include file=""%>

原代码：

<body>
		welcome to the page "the view of the static include result"<br>
		<%@include file="a.jsp" %>
	</body>

测试结果图：

转换后对应的servlet文件：

public void _jspService(final javax.servlet.http.HttpServletRequest request, final javax.servlet.http.HttpServletResponse response)
        throws java.io.IOException, javax.servlet.ServletException {

final java.lang.String _jspx_method = request.getMethod();
if (!"GET".equals(_jspx_method) && !"POST".equals(_jspx_method) && !"HEAD".equals(_jspx_method) && !javax.servlet.DispatcherType.ERROR.equals(request.getDispatcherType())) {
response.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED, "JSPs only permit GET POST or HEAD");
return;
}

    final javax.servlet.jsp.PageContext pageContext;
    javax.servlet.http.HttpSession session = null;
    final javax.servlet.ServletContext application;
    final javax.servlet.ServletConfig config;
    javax.servlet.jsp.JspWriter out = null;
    final java.lang.Object page = this;
    javax.servlet.jsp.JspWriter _jspx_out = null;
    javax.servlet.jsp.PageContext _jspx_page_context = null;


    try {
      response.setContentType("text/html; charset=GBK");
      pageContext = _jspxFactory.getPageContext(this, request, response,
      			"", true, 8192, true);
      _jspx_page_context = pageContext;
      application = pageContext.getServletContext();
      config = pageContext.getServletConfig();
      session = pageContext.getSession();
      out = pageContext.getOut();
      _jspx_out = out;

      out.write("\r\n");
      out.write("<html>\r\n");
      out.write("\t<head>\r\n");
      out.write("\t\t<title>static include</title>\r\n");
      out.write("\t</head>\r\n");
      out.write("\t<body>\r\n");
      out.write("\t\twelcome to the page \"the view of the static include result\"<br>\r\n");
      out.write("\t\t");
      out.write("\r\n");
      out.write("<html>\r\n");
      out.write("<head>\r\n");
      out.write("\t<title>welcome</title>\r\n");
      out.write("</head>\r\n");
      out.write("<body>\r\n");
      out.write("\twelcome here to learn Java\r\n");
      out.write("\t浣犲ソ\r\n");
      out.write("\t");
      out.write('\r');
      out.write('\n');
      out.write('	');
      out.print("hello" );
      out.write('\r');
      out.write('\n');
      out.write('	');
int a = 4;  
      out.write(" \r\n");
      out.write("\t");
      out.print(a );
      out.write("\r\n");
      out.write("</body>\r\n");
      out.write("</html>");
      out.write("\r\n");
      out.write("\t</body>\r\n");
      out.write("</html>");
    } catch (java.lang.Throwable t) {
      if (!(t instanceof javax.servlet.jsp.SkipPageException)){
        out = _jspx_out;
        if (out != null && out.getBufferSize() != 0)
          try {
            if (response.isCommitted()) {
              out.flush();
            } else {
              out.clearBuffer();
            }
          } catch (java.io.IOException e) {}
        if (_jspx_page_context != null) _jspx_page_context.handlePageException(t);
        else throw new ServletException(t);
      }
    } finally {
      _jspxFactory.releasePageContext(_jspx_page_context);
    }
  }