Spring MVC(七)

文章目录

- Spring MVC Hibernate验证器
- Spring MVC生成RSS源

Spring MVC Hibernate验证器

创建一个名称为 Hibernatevalidator 的动态WEB项目
在 com.yiibai.springmvc 包下创建三个Java类：Student和StudentController
在jsp子文件夹下创建两个视图文件：addStudent.jsp, result.jsp
下载Hibernate Validator库 - Hibernate Validator。解压缩hibernate-validator-5.3.4.Final.jar和所需的依赖关系存并将它们放在CLASSPATH中
在src文件夹下创建属性文件messages.properties

Student.java

package com.yiibai.springmvc;
import org.hibernate.validator.constraints.NotEmpty;
import org.hibernate.validator.constraints.Range;

public class Student {

   @Range(min = 1, max = 150) 
   private Integer age;
   @NotEmpty
   private String name;
   private Integer id;

   public void setAge(Integer age) {
      this.age = age;
   }
   public Integer getAge() {
      return age;
   }

   public void setName(String name) {
      this.name = name;
   }
   public String getName() {
      return name;
   }

   public void setId(Integer id) {
      this.id = id;
   }
   public Integer getId() {
      return id;
   }
}

StudentController.java

package com.yiibai.springmvc;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.validation.BindingResult;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;

@Controller
public class StudentController {

   @RequestMapping(value = "/addStudent", method = RequestMethod.GET)
   public ModelAndView student() {
      return new ModelAndView("addStudent", "command", new Student());
   }

   @ModelAttribute("student")
   public Student createStudentModel() {    
      return new Student();
   }

   @RequestMapping(value = "/addStudent", method = RequestMethod.POST)
   public String addStudent(@ModelAttribute("student") @Validated Student student, 
      BindingResult bindingResult, Model model) {
      if (bindingResult.hasErrors()) {
         return "addStudent";
      }
      model.addAttribute("name", student.getName());
      model.addAttribute("age", student.getAge());
      model.addAttribute("id", student.getId());

      return "result";
   }
}

message.properties配置

NotEmpty.student.name = Name is required!
Range.student.age = Age value must be between 1 and 150!

这里的键可以是..。
Value是要显示的消息

Hibernatevalidator-servlet.xml

第一个服务方法student()，已经在ModelAndView对象中传递了一个名称为“command”的空对象
如果在JSP文件中使用标签，spring框架需要一个名称为“command”的对象。所以当调用student()方法时，返回addStudent.jsp视图。
服务方法addStudent()将在URL： Hibernatevalidator/addStudent 上的POST方法被调用。
addStudent()将根据提交的信息准备模型对象。最后从服务方法返回“result”视图，这将渲染result.jsp。
如果使用validator生成错误，则返回相同的视图“addStudent”，则Spring自动从视图中的BindingResult注入错误消息并显示出来。

addStudent.jsp

<%@ page contentType="text/html; charset=UTF-8" %>
<%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>


    Spring MVC Form Handling




学生信息

   
   
    
        姓名：
        
        
    
    
        年龄：
        
        
    
    
        编号：

标记，其中path =“*”来呈现错误消息。

上诉代码将呈现所有输入验证的错误消息
使用带有·path =“name”的标记来渲染name字段的错误消息

上诉代码将呈现姓名(name)和年龄(age)字段验证的错误消息

result.jsp

<%@ page contentType="text/html; charset=UTF-8" %>
<%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>


    Spring MVC Form Handling



提交的学生信息如下 -
   
    
        姓名：
        ${name}
    
    
        年龄：
        ${age}
    
    
        编号：
        ${id}

Spring MVC生成RSS源

创建一个名称为 GenerateRSSFeed 的动态WEB项目
在 com.yiibai.springmvc 包下创建三个Java类：RSSMessage, RSSFeedViewer 和 RSSController
下载配置 Rome 库及其依赖项rome-utils，jdom和slf4j。和所需的依赖关系存并将它们放在CLASSPATH中
在src文件夹下创建属性文件messages.properties

RSSMessage.java

package com.yiibai.springmvc;

import java.util.Date;

public class RSSMessage {
   String title;
   String url;
   String summary;
   Date createdDate;
   public String getTitle() {
      return title;
   }
   public void setTitle(String title) {
      this.title = title;
   }
   public String getUrl() {
      return url;
   }
   public void setUrl(String url) {
      this.url = url;
   }
   public String getSummary() {
      return summary;
   }
   public void setSummary(String summary) {
      this.summary = summary;
   }
   public Date getCreatedDate() {
      return createdDate;
   }
   public void setCreatedDate(Date createdDate) {
      this.createdDate = createdDate;
   }    
}

RSSFeedViewer.java

package com.yiibai.springmvc;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.view.feed.AbstractRssFeedView;

import com.rometools.rome.feed.rss.Channel;
import com.rometools.rome.feed.rss.Content;
import com.rometools.rome.feed.rss.Item;

public class RSSFeedViewer extends AbstractRssFeedView {

   @Override
   protected void buildFeedmetadata(Map model, Channel feed,
      HttpServletRequest request) {

      feed.setTitle("YiibaiPoint Dot Com");
      feed.setDescription("Java Yiibai and Examples");
      feed.setlink("http://www.yiibai.com");

      super.buildFeedmetadata(model, feed, request);
   }

   @Override
   protected List buildFeedItems(Map model,
      HttpServletRequest request, HttpServletResponse response) throws Exception {

      List listContent = (List) model.get("feedContent");
      List items = new ArrayList(listContent.size());

      for(RSSMessage tempContent : listContent ){

         Item item = new Item();

         Content content = new Content();
         content.setValue(tempContent.getSummary());
         item.setContent(content);

         item.setTitle(tempContent.getTitle());
         item.setlink(tempContent.getUrl());
         item.setPubDate(tempContent.getCreatedDate());

         items.add(item);
      }

      return items;        
   }
}

RSSController.java

import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;

@Controller
public class RSSController {
   @RequestMapping(value="/rssfeed", method = RequestMethod.GET)
   public ModelAndView getFeedInRss() {

      List items = new ArrayList();

      RSSMessage content  = new RSSMessage();
      content.setTitle("Spring教程");
      content.setUrl("http://www.yiibai/spring");
      content.setSummary("Spring tutorial summary...");
      content.setCreatedDate(new Date());
      items.add(content);

      RSSMessage content2  = new RSSMessage();
      content2.setTitle("Spring MVC教程");
      content2.setUrl("http://www.yiibai/spring_mvc");
      content2.setSummary("Spring MVC tutorial summary...");
      content2.setCreatedDate(new Date());
      items.add(content2);

      ModelAndView mav = new ModelAndView();
      mav.setViewName("rssViewer");
      mav.addObject("feedContent", items);

      return mav;
   }
}

GenerateRSSFeed-servlet.xml

Spring MVC(七)

学生信息

提交的学生信息如下 -

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