一.EntityManagerFactory的种类 1.The JPA specification defines two kinds of entity managers:  Application-managed—Entity managers are created when an application directly requests one from an entity manager factory. With application-managed entity manage…

一.JpaRepository 1.要使Spring自动生成实现类的步骤 (1)配置文件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:…

一.注入EntityManagerFactory的方式 package com.habuma.spittr.persistence; import java.util.List; import javax.persistence.EntityManagerFactory; import javax.persistence.PersistenceUnit; import org.springframework.dao.DataAccessException; import org.springfr…

一.结构 二.Repository层 1. package spittr.db; import java.util.List; import spittr.domain.Spitter; /** * Repository interface with operations for {@link Spitter} persistence. * @author habuma */ public interface SpitterRepository { long count(); Spitter s…

一.结构 二.Repository层 1. package spittr.db; import java.util.List; import org.springframework.data.jpa.repository.JpaRepository; import spittr.domain.Spitter; /** * Repository interface with operations for {@link Spitter} persistence. * @author habuma *…

一.结构 二.Repository层 1. package spittr.db; import java.util.List; import spittr.domain.Spitter; /** * Repository interface with operations for {@link Spitter} persistence. * @author habuma */ public interface SpitterRepository { long count(); Spitter s…

一. 1.Spring MVC provides several ways that a client can pass data into a controller’s handler method. These include  Query parameters Form parameters Path variables 二.以query parameters的形式给action传参数 1.传参数 @Test public void shouldShowPagedSpittles()…

No matter what happens, good or bad, the outcome of a servlet request is a servlet response. If an exception occurs during request processing, the outcome is still a servlet response. Somehow, the exception must be translated into a response. Spring…

一.什么是multipart The Spittr application calls for file uploads in two places. When a new user registers with the application, you’d like them to be able to provide a picture to associate with their profile. And when a user posts a new Spittle , they ma…

一.所有声明都用xml 1. <?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation=&quo…