为什么我的修改页面跳转不过去......其他功能都没问题
package com.work.school;
public class School {
private String id;
private String name;
private String information;
public School(String id, String name, String information) {
super();
this.id = id;
this.name = name;
this.information = information;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getInformation() {
return information;
}
public void setInformation(String information) {
this.information = information;
}
}
package com.work.school;
public class User {
private String nameId;
private String password;
public User(String nameId, String password) {
super();
this.nameId = nameId;
this.password = password;
}
public String getNameId() {
return nameId;
}
public void setNameId(String nameId) {
this.nameId = nameId;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
package com.work.xkdb;
import java.util.List;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
import com.work.school.School;
import com.work.school.User;
public class Xk {
public static List<User> list = new ArrayList<User>();
public static Map<String, School> map = new HashMap<String,School>();
static{
map.put("101",new School("101", "开学","请同学们于9月1日前来报道!"));
map.put("102",new School("102", "选课","开始选课啦~"));
map.put("103",new School("103", "竞选班委","将于近期竞选班干部~"));
map.put("104",new School("104", "评选奖学金","评选奖学金啦~"));
list.add(new User("gfq", "123456"));
}
//判断用户名和密码是否正确
public static boolean selectUserByAccountAndPassword(User user){
boolean flag = false;
for(User key : list){
if (user.getNameId().equals(key.getNameId()) && user.getPassword().equals(key.getPassword())) {
flag = true;
break;
}
}
return flag;
}
//查询判断
public static boolean isNoticeExist(String id){
boolean flag = false;
for (String key : map.keySet()) {
School school = map.get(key);
if(id.equals(school.getId())) {
flag = true;
break;
}
}
return flag;
}
//增加判断
public static boolean isExist(String id){
boolean flag = false;
for (String key : map.keySet()) {
School school = map.get(key);
if(id.equals(school.getId())) {
flag = true;
break;
}else {
flag = false;
break;
}
}
return flag;
}
}
<%@ 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>选课管理系统</title>
</head>
<body>
<h1 align="center">选课管理系统登录页面</h1>
<hr>
<!-- action代表了服务器端的处理程序 -->
<form action="control.jsp">
<table align="center">
<tr>
<td>账号：</td>
<td>
<input type="text" name="nameid"/>
</td>
</tr>
<tr>
<td>密码：</td>
<td>
<input type="password" name="password"/>
</td>
</tr>
<tr>
<td>
<input type="submit" value="登录"/>
</td>
</tr>
</table>
</form>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=utf-8" errorPage="error.jsp"
pageEncoding="utf-8" import="com.work.school.*,com.work.xkdb.*,java.util.*"%>
<!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>选课管理系统</title>
</head>
<body>
<!-- 获取账号和密码，并且调用DButil当中的方法来判断是否存在指定信息
request：获取请求信息
getParameter(String name):可以通过一个控件的name属性来获取控件的值
out:输出流对象，输出指定信息
-->
<%
String nameid = request.getParameter("nameid");
String password = request.getParameter("password");
User user = new User(nameid,password);
boolean flag = Xk.selectUserByAccountAndPassword(user);
Map<String,School> map = Xk.map;
//List<User> list = Xk.list;
if(flag == true){
Object o = application.getAttribute("count");
if(o == null){
application.setAttribute("count", 1);
}else{
int count = Integer.parseInt(o.toString());
application.setAttribute("count", count+1);
}
session.setAttribute("nameid", nameid);
%>
<h3 align="right">登录账户：<%= session.getAttribute("nameid") %></h3>
<h3 align="right">访问量：<%= application.getAttribute("count") %></h3>
<h2 align="center">欢迎来到选课管理系统首页</h2>
<hr>
<form action="select.jsp">
<table border="1px" width="500px" style="margin-bottom:20px;" align="center">
<tr>
<td>公告内容：</td>
<td><input type="text" name="id" placeholder="请输入要查询的编号"/></td>
<td><input type="submit" value="查询"/></td>
</tr>
</table>
</form>
<table align="center" border="1" width="500px">
<tr align="center">
<td>编号</td>
<td>标题</td>
<td>内容</td>
<td>删除</td>
<td>修改</td>
</tr>
<%
for(String key : map.keySet()){
School s = map.get(key);
%>
<tr align="center">
<td><%= s.getId()%></td>
<td><%= s.getName()%></td>
<td><%= s.getInformation()%></td>
<!-- 相邻两个jsp页面传递数据的时候，通过URL参数的方式来传递参数
规则：
资源？key=value&key=value
-->
<td><a href="delete.jsp?id=<%= s.getId() %>">删除</a></td>
<td><a href="update.jsp?id=<%= s.getId()%>&name=<%= s.getName()%>&information=<%= s.getInformation()%>">修改</a></td>
</tr>
<%
}
%>
</table>
<%
}else{
throw new Exception("账户和密码错误");
}
%>
<div style="margin-bottom:20px;" align="center">
<input type="submit" name="add" value="添加公告" class="join-btn" onclick="window.location.href='add.jsp'">
<input type="submit" name="index" value="返回登录" class="join-btn" onclick="window.location.href='index.jsp'">
</div>
</body>
</html>
<%@ 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>选课管理系统</title>
</head>
<body>
<h3 align="center">公告更新界面</h3>
<hr/>
<h3 align="right">登录账户：<%= session.getAttribute("nameid") %></h3>
<form action="update_control.jsp">
<table align="center" border="1" width="250px">
<tr>
<td>编号</td>
<td><input type="text" readonly="readonly" name="id" value="<%= request.getParameter("id") %>"/></td>
</tr>
<tr>
<td>标题</td>
<td><input type="text" name="name" value="<%= request.getParameter("name") %>"/></td>
</tr>
<tr>
<td>内容</td>
<td><input type="text" name="imformation" value="<%= request.getParameter("imformation") %>"/></td>
</tr>
<tr>
<td colspan="2"><input type="submit" value="修改"/></td>
</tr>
</table>
</form>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=utf-8" errorPage="error.jsp"
pageEncoding="utf-8" import="com.work.school.*,com.work.xkdb.*,java.util.*"%>
<!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>选课管理系统</title>
</head>
<body>
<%
Map<String,School> map = Xk.map;
School school = map.get(request.getParameter("id"));
school.setId(request.getParameter("id"));
school.setName(request.getParameter("name"));
school.setInformation(request.getParameter("information"));
%>
<h3 align="center">修改信息成功</h3>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=utf-8" errorPage="error.jsp"
pageEncoding="utf-8" import="com.work.school.*,com.work.xkdb.*,java.util.*"%>
<!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>选课管理系统</title>
</head>
<body>
<%
String id = request.getParameter("id");
boolean flag = Xk.isNoticeExist(id);
if(flag == true){
%>
<h2 align="center">欢迎来到选课管理系统首页</h2>
<hr>
<table border="1px" width="500px" style="margin-bottom:20px;" align="center">
<tr>
<td>公告编号：</td>
<td><input type="text" name="id" value="null"/></td>
<td><input type="submit" value="查询"/></td>
</tr>
</table>
<%
Map<String,School> map = Xk.map;
School s = map.get(id);
%>
<table align="center" border="1" width="500px">
<tr align="center">
<td>编号</td>
<td>标题</td>
<td>内容</td>
<td>删除</td>
<td>修改</td>
</tr>
<tr align="center">
<td><%= s.getId()%></td>
<td><%= s.getName()%></td>
<td><%= s.getInformation()%></td>
<!-- 相邻两个jsp页面传递数据的时候，通过URL参数的方式来传递参数
规则：
资源？key=value&key=value
-->
<td><a href="delete.jsp?id=<%= s.getId() %>">删除</a></td>
<td><a href="update.jsp?id=<%= s.getId()%>&name=<%= s.getName()%>&information=<%= s.getInformation()%>">修改</a></td>
</tr>
</table>
<%
}else{
throw new Exception("您查询的公告不存在！");
}
%>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=utf-8" errorPage="error.jsp"
pageEncoding="utf-8" import="com.work.school.*,com.work.xkdb.*,java.util.*"%>
<!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>选课管理系统</title>
</head>
<body>
<%
Map<String,School> map = Xk.map;
map.remove(request.getParameter("id"));
%>
<h3>删除公告编号为：<%= request.getParameter("id")%></h3>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=utf-8" errorPage="error.jsp"
pageEncoding="utf-8" import="com.work.school.*,com.work.xkdb.*,java.util.*"%>
<!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>选课管理系统</title>
</head>
<body>
<h3 align="center">公告添加界面</h3>
<hr/>
<form action="add_control.jsp">
<table align="center" border="1" width="250px">
<tr>
<td>编号</td>
<td><input type="text" name="id1" placeholder="编号"/></td>
</tr>
<tr>
<td>标题</td>
<td><input type="text" name="name1" placeholder="标题"/></td>
</tr>
<tr>
<td>内容</td>
<td><input type="text" name="information1" placeholder="内容"/></td>
</tr>
<tr>
<td colspan="2"><input type="submit" value="修改"/></td>
</tr>
</table>
</form>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=utf-8" errorPage="error.jsp"
pageEncoding="utf-8" import="com.work.school.*,com.work.xkdb.*,java.util.*"%>
<!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>Insert title here</title>
</head>
<body>
<%
String id = request.getParameter("id1");
boolean flag = Xk.isExist(id);
if(flag == false){
Map<String,School> map = Xk.map;
map.put(id, new School(id,request.getParameter("name1"),request.getParameter("information1")));
%>
<h3>添加公告编号为：<%= request.getParameter("id1")%></h3>
<%
}else{
%>
<h3>编号已存在！</h3>
<%
}
%>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8" isErrorPage="true"%>
<!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>选课管理系统</title>
</head>
<body>
<!--
exception对象只能在错误页面中使用，page加入一个属性isErrorPage="true"
有一个页面出现了异常，在页面中指定一个错误处理的页面 ，page指令当中，errorpage来指定
-->
<%= exception.getMessage()%>
</body>
</html>27
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2回答
这是因为在tomcat中默认的编码格式为ISO-8859-1，你可以按照如下方法操作：定义一个String类型的变量str用来接收数据；譬如String str=从其他页面传过来的数据，然后将str进行转码，可以使用如下代码进行转码，String str1=new String(str.getBytes("ISO-8859-1"),"utf-8"); 如果我的建议解决了你的问题，请采纳，祝学习愉快~
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