页面回显与URL模板映射
一.页面回显
对于需要返回界面的数据，可以将后台封装好的数据回显至原始jsp界面中。
举个例子：
User.java
package com.zk.data;
public class User {
public String sname;
public String sno;
public String sid;
public String getSname() {
return sname;
}
public void setSname(String sname) {
this.sname = sname;
}
public String getSno() {
return sno;
}
public void setSno(String sno) {
this.sno = sno;
}
public String getSid() {
return sid;
}
public void setSid(String sid) {
this.sid = sid;
}
}
UserCustom.java
package com.zk.data;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class UserCustom {
private User user;
private List<User> userList;
private Map<String,Object> usermap=new HashMap<String,Object>();
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
public List<User> getUserList() {
return userList;
}
public void setUserList(List<User> userList) {
this.userList = userList;
}
public Map<String, Object> getUsermap() {
return usermap;
}
public void setUsermap(Map<String, Object> usermap) {
this.usermap = usermap;
}
@Override
public String toString() {
return "UserCustom [user=" + user + "]";
}
}
SpringMVC.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans
xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">
<context:component-scan base-package="com.zk.Controller"></context:component-scan>
<!-- 配置注解处理器映射器
功能：寻找执行类Controller
-->
<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping"></bean>
<!-- 配置注解处理器适配器
功能：调用controller方法，执行controller
-->
<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"></bean>
<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/jsp/"></property>
<property name="suffix" value=".jsp"></property>
</bean>
</beans>
UserController.java
package com.zk.Controller;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;
import com.zk.data.User;
import com.zk.data.UserCustom;
@Controller//<bean id="UserController" class="UserController路径">
public class UserController {
//接受javaBean参数
@RequestMapping("list")
public String list(Model model){
List<User> userList=new ArrayList<User>();
User user1=new User();
user1.setSid("1");
user1.setSname("a");
user1.setSno("No1");
User user2=new User();
user2.setSid("2");
user2.setSname("b");
user2.setSno("No2");
User user3=new User();
user3.setSid("2");
user3.setSname("b");
user3.setSno("No3");
userList.add(user1);
userList.add(user2);
userList.add(user3);
model.addAttribute("userList", userList);
return "list";
}
}
list.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>回显List集合</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<h1>欢迎来SpringMVC</h1>
<table border='1'>
<tr>
<td>姓名</td>
<td>ID</td>
<td>编号</td>
</tr>
<c:forEach items="${userList}" var="user">
<tr>
<td>${user.sname}</td>
<td>${user.sid}</td>
<td>${user.sno}</td>
<td><a href="${pageContext.request.contextPath }/${user.sid}.do">修改</a></td>
</tr>
</c:forEach>
</table>
</body>
</html>
运行后结果如下：
二.URL模板映射
在上面的例子中，list.jsp页面里有行URL模板映射
<td><a href="${pageContext.request.contextPath }/${user.sid}.do">修改</a></td>
在后台UserController.java的处理逻辑如下：
package com.zk.Controller;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;
import com.zk.data.User;
import com.zk.data.UserCustom;
@Controller//<bean id="UserController" class="UserController路径">
public class UserController {
//接受javaBean参数
@RequestMapping("list")
public String list(Model model){
List<User> userList=new ArrayList<User>();
User user1=new User();
user1.setSid("1");
user1.setSname("a");
user1.setSno("No1");
User user2=new User();
user2.setSid("2");
user2.setSname("b");
user2.setSno("No2");
User user3=new User();
user3.setSid("2");
user3.setSname("b");
user3.setSno("No3");
userList.add(user1);
userList.add(user2);
userList.add(user3);
model.addAttribute("userList", userList);
return "list";
}
@RequestMapping("/{id}")
public String update(@PathVariable Integer id){
System.out.println(id);
return "redirect:list.do";
}
}
它将返回list.jsp界面，并输出id值。
