--- SpringBoot springboot sixth day using spring data jpa, and displays the data on the page

spring boot integrated spring Data JPA page yaml

Before doing the test or project ideas at the first stroke to start again, such an error can quickly find where to step Code Error

1.1 Demand : query the database --- "------ Data" to display the page

1.2 Analysis

1 Create a user database table

2 persistence framework spring data jpa

3 json jsp static html freemarker

1.3 page display

HTML display data vue.js angular.js

Dynamic page shows: Each page request is generated once

Jsp servlet essentially works on a web project -

springbooot project does not recommend the use of jsp

Template technology freemarker

tymeleaf

velocity

Steps for usage:

a: add dependencies

b: Create a template file location to save resources / templates directory under the file extension .ftl

c write controller sends the result back to the template

1.4 yaml file format

key --value

1.4.1 Syntax key: value

key1:

key2:

key3: value

1.4.2 property values from

@Value("${key2}")

Accordance with the idea to go:

1. Add dependence:

https://www.cnblogs.com/xinghaonan/p/11798238.html

Front blog has written, please add their own

2: Create a template file (must: springboot constraint larger than the configured) location to save resources / templates directory under the file extension .ftl

Writing the code :

<html>
    <head>
        <title> spring boot</title>
    </head>
    <body>
        <table border="3px">
            <thead>
                <tr>
                    <th>id</th>
                    <th>账号</th>
                    <th>密码</th>
                    <th></Nameth>
                </tr>
            </thead>
            <#list userList as user >    <!--userList为controller中添加到域对象中的数据-->
                <tbody>
                <tr>
                    <td>${user.id}</td>
                    <td>${user.username}</td>
                    <td>${user.password}</td>
                    <td>${user.name}</td>
                </tr>
                </tbody>
            </#list>
        </table>
    </body>
</html>

Creating Controller Interface

package com.xhn.controller;

import com.xhn.dao.UserDao;
import com.xhn.entity.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;

import java.util.List;

@Controller
@RequestMapping("/page")
public class PageUserController {

    @Autowired
    private UserDao userDao;

    //查询数据库数据
    @RequestMapping("/user/list")
     Public String getUserList (a ModelMap Map) { 
        List <the User> userList = userDao.findAll (); 
        map.addAttribute ( "userList" , userList);
         return "User" ; // view similar to the internal resolver springmvc in front suffixes do not write 
    } 
}

UserDao layer:

https://www.cnblogs.com/xinghaonan/p/11799854.html

The day before write notes, will not be repeated

Figure operating results:

carry out

--- SpringBoot springboot sixth day using spring data jpa, and displays the data on the page

spring boot integrated spring Data JPA page yaml

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