分类： 系统运维
2012-02-19 21:24:28
1.jsp页面间通过request/session传值
1).通过request来拿参数
当某一个页面的form提交之后(form中有"ss"字段)，所对应的action便可以用request.getParameter("ss")获取这个"ss"的值。
2).通过session来拿参数
也可以在一个form中设置下参数，使用session.setAttribute("ss");再通过form对应的action中获得"ss"的参数值，使用的是(String)session.getAttribute("ss")
可以看：
session1.jsp（从表单输入usernmae，将该参数传递到session2.jsp）
session2.jsp（接收session1.jsp传递过来的参数username，存到session中，然后在将参数place通过表单提交到session3.jsp中）
<%@ page language="java" contentType="text/html; charset=gb2312"%>
<%
String username = request.getParameter("username");
session.setAttribute("username",username); %>
hello,
<%=username%>
!the place you want to go is
session3.jsp（接收session2.jsp传递过来的参数place，并从session中读取参数username），输出
<%@ page language="java" contentType="text/html; charset=gb2312"%>
<%
String username = (String) session.getAttribute("username");
String place = request.getParameter("place"); %>
<%= username %>
the place you want to go is
<%=place %>
2.使用JavaBean传值
1).第一种传值方式：调用bean的set/get函数传值:
<%
noticebean.setTitle("今天星期几");
noticebean.setContent("星期一");%>
<%=noticebean.getTitle()%>
<%=noticebean.getContent() %>
2).第二种传值方式 使用 jsp:getProperty 读取值
例子可以看：
NoticeBean.java
package com.sunday.beans;
public class NoticeBean {
int id;
String title;
String content;。
public NoticeBean(){}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getContent() {
return content;
}
public void setContent(String content) {
this.content = content;
}}
beantest.jsp
<%@ page language="java" contentType="text/html; charset=gb2312"%>
<%
noticebean.setTitle("今天星期几");
noticebean.setContent("星期一");%>
the first question:
<%=noticebean.getTitle()%>
answer:
<%=noticebean.getContent() %>
<%
noticebean.setTitle("明天呢");
noticebean.setContent("星期二");%>
the second question:
3.Servlet示例
Servlet是jsp的基础。事实上，在web服务器中，jsp经编译之后都将转换成Servlet。
//ServletTest.Java
package demo;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class ServletTest extends HttpServlet {
private static final long serialVersionUID = 1L;
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException {
//代码中直接写出jsp
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("");
out.println("");
out.println("");
out.println("
out.println("");
out.println("");
out.println("This is a servlet demo!
");
out.println("");
out.println("");
}
}
web.xml中的配置：
4.jdbc示例
有连接mysql,oracle 9i和sql2000的示例，以及mysql数据库方面的操作，示例如下：
package demo;
import java.sql.*;
import demo.NoticeBean;
public class JDBCTest {
public static void main(String args[]) {
// 连接Oracle 9i及SQL Server 2000的例程
/* try {
String name = "oracle.jdbc.driver.OracleDriver";
String url = "jdbc:oracle:thin:@localhost:1521:kevin";
Class.forName(name).newInstance();
Connection con = DriverManager.getConnection(url, "kevin", "kevin");
System.out.println("连接Oracle 9i成功!");
con.close();
} catch (Exception e) {
e.printStackTrace();
}
try {
String name = "com.microsoft.jdbc.sqlserver.SQLServerDriver";
String url = "jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=JavaWeb";
Class.forName(name).newInstance();
Connection con = DriverManager.getConnection(url, "sa", "sa");
System.out.println("连接SQL Server 2000成功!");
con.close();
} catch (Exception e) {
e.printStackTrace();
}*/
Connection connection = null;
Statement statement = null;
ResultSet resultSet = null;
//连接mysql的
try {
String driverName = "org.gjt.mm.mysql.Driver";
Class.forName(driverName).newInstance();
String url = "jdbc:mysql://localhost:3306/JavaWeb?useUnicode=true&characterEncoding=gb2312";
connection = DriverManager.getConnection(url, "root", "root");
System.out.println("连接MySQL 5.0.18成功!(驱动3.1.12)");
statement = null;
resultSet = null;
String strSql = null;
NoticeBean bean = null;
String title = null;
String content = null;
// 对数据库的插入操作
try {
title = "标题";
content = "内容";
strSql = "INSERT INTO notice(title, content) VALUES('" + title
+ "','" + content + "')";
statement = connection.createStatement();
statement.executeUpdate(strSql);
System.out.println("插入语句执行成功：" + strSql);
} catch (SQLException ex1) {
System.out.println("插入失败！");
}
// 对数据库的查询操作
try {
strSql = "SELECT * FROM notice";
statement = connection.createStatement(
ResultSet.TYPE_SCROLL_INSENSITIVE,
ResultSet.CONCUR_READ_ONLY);
resultSet = statement.executeQuery(strSql);
if (resultSet.next()) {
int id = resultSet.getInt("id");
title = resultSet.getString("title");
content = resultSet.getString("content");
if (resultSet.next()) {
bean = new NoticeBean(id, title, content);
}
System.out.println("notice表的第一行数据是：" + bean.getId() + " "
+ bean.getContent() + " " + bean.getTitle());
}
} catch (SQLException ex1) {
System.out.println("查询失败！");
}
// 对数据库的删除操作
try {
strSql = "DELETE FROM notice";
statement = connection.createStatement();
statement.executeUpdate(strSql);
System.out.println("notice表的所有数据已被删除！");
} catch (SQLException ex1) {
System.out.println("删除失败！");
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (resultSet != null) {
resultSet.close();
resultSet = null;
}
if (statement != null) {
statement.close();
statement = null;
}
if (connection != null) {
connection.close();
connection = null;
}
} catch (SQLException ex) {
System.err.println(ex.getMessage());
}
}
}
}
精通J2EE整合应用案例-5章笔记.doc