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

1	`<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";
    }
}