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[javaEE] jsp入門，javaeejsp入門

編輯：JAVA綜合教程

[javaEE] jsp入門，javaeejsp入門

Servlet寫java代碼很好，但是拼接html的時候，非常不方便

JSP可以在html中嵌套java代碼，這樣在展示的時候，就會比較方便

Tomcat幫我們把jsp的頁面翻譯成了Servlet去運行的，查看目錄

Tomcat目錄\work\Catalina\localhost\

生成一個xxx_jsp.java的Servlet文件，jsp的腳本片段放在了_jspService()方法裡面

使用eclipse創建項目以後，修改一下發布路徑，直接發布到Tomcat的webapps目錄下，

在Servers標簽欄，先刪除下面的項目，在右鍵點open，選擇use Tomcat installation

jsp聲明：<%! 若干java代碼%>，此處的代碼會解析到類的成員的地方

jsp注釋：<%--注釋的內容--%>

index.jsp

<%@page import="org.apache.jasper.tagplugins.jstl.core.Out"%>
<%@page import="java.util.Date"%>
<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>首頁</title>
</head>
<body>
<%!
public void test(){
    int a=0;
}
%>
<% 
for(int i=0;i<5;i++){
    out.write(i+"");
}
%>
<%-- 
Date date=new Date();
out.write(date.toLocaleString());
--%>
你好，JSP
</body>
</html>

index_jsp.java

public final class index_jsp extends org.apache.jasper.runtime.HttpJspBase
    implements org.apache.jasper.runtime.JspSourceDependent {


public void test(){
    int a=0;
}
 public void _jspService(final javax.servlet.http.HttpServletRequest request, final javax.servlet.http.HttpServletResponse response)
        throws java.io.IOException, javax.servlet.ServletException {

    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=utf-8");
      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("\r\n");
      out.write("\r\n");
      out.write("<!DOCTYPE html PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\" \"http://www.w3.org/TR/html4/loose.dtd\">\r\n");
      out.write("<html>\r\n");
      out.write("<head>\r\n");
      out.write("<meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\">\r\n");
      out.write("<title>首頁</title>\r\n");
      out.write("</head>\r\n");
      out.write("<body>\r\n");
      out.write('\r');
      out.write('\n');
 
for(int i=0;i<5;i++){
    out.write(i+"");
}

      out.write('\r');
      out.write('\n');
      out.write("\r\n");
      out.write("你好，JSP\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);
    }
  }