Penjelasan terperinci tentang kombinasi MVC Spring Mybatis Framework Contoh

menjelaskan

Proyek ini mengadopsi struktur Maven, yang terutama menunjukkan Spring MVC + Mybatis, pengontrol untuk mendapatkan data dan mengembalikan data dalam format JSON.

Struktur proyek

Ketergantungan dan instruksi paket

File pom:

 <Project xmlns = "http://maven.apache.org/pom/4.0.0" xmlns: xsi = "http://www.w3.org/2001/xmlschema-instance" xsi: schemalocation = "http:/maven.apache.rompe.rompe.romper http://maven.apache.org/maven-v4_0_0.xsd"><modelversion>4.0.0</modelversion><groupid>com.hbb0b0.maven01</gro Upid> <ArTifactId> maven01 </artifactid> <packaging> war </packaging> <version> 0.0.1-snapshot </version> <name> maven01 MAVEN Webapp </name> <rerl> http://maven.apache.org </ruRl> <properties> <!-Nomor versi mybatis-> <mybatis.version> 3.2.6 </mybatis.version> <!-Paket Manajemen File Log4j Log Log Log Log4J Versi-> <slf4j.version> 1.7.7 </slf4j.version> <tog4j.version> 1.2.17 </log4j.version> </ProSies> <dependencies> <dependency> <groupid> Junit </groupid> <Artifactid> junit </arttifactid> <sidan vers ion> 3.8.1 </version> <scope> tes </ scope> </dependency> <dependency> <GroupId> org.springframework </groupid> <ArTifactId> Spring-WEBMVC </artifactid> <version> 4.1.2.release </versi> </dependency> <!--Versi 4.1.2.release </Versi> </Dependency> <! https://mvnrepository.com/artifact/org.codehaus.jackson/jackson-mapper-asl-> <dependency> <groupid> org.codehaus.jackson </groupid> <ArTifactid> Jackson-Mapper- Asl </artifactid> </Version> 1.9.2 </Version> </Dendening </Artifactid> </Version> </Version> </Version> </ARTIFACTID> </Version> </Version> </Version> </artifactid </artifactid> https://mvnrepository.com/artifact/org.codehaus.jackson/jackson-core-asl-> <dependency> <groupid> org.codehaus.jackson </groupid> <ArTifactid> Jackson-core- Asl </artifactid> </Versi> 1.9.13 </Version> </Version> </Artifactid> </Version> 1.9.13 </Version> </Version> </Artifactid> </Version> 1.9.13 </Version> </Artifactid> </Version> </Version> </artifactid> </artifactid </artifactid> https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind-> <dependency> <groupid> com.fasterxml.jackson.core </groupid> <ArtiFacTID> Jackson-Databind </arttifactid> </groupid> <artifactid> Jackson-databind </arttifactid> </Versi 2.9.3. -> <dependency> <GroupId> org.mybatis </groupid> <ArTifactId> mybatis-spring </artifactid> <version> 1.3.0 </version> </dependency> <!-impor tautan database mySQL Paket-> <dependency> <GroupId> mysql </groupid> <ArTifactId> mysql-connector-java </artifactid> <version> 5.1.30 </version> </dependency> <!-mybatis orm framework--><dependency><groupId>org.mybatis</groupId><artifactId>mybatis</artifactId><version>3.4.1</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-tx</artifactId><version>4.1.2.RELEAS E </version> </dependency> <dependency> <GroupId> org.springframework </groupid> <ArTifactId> spring-jdbc </artifactid> <version> 4.1.2.release </version> </dependency> </dependencies> <build> <finalname> maven01 </finalname> </dependencies> <bangun> <fulname> maven01 </finalname> </final/

Instruksi konfigurasi

Web.xml

 <! Doctype Web-App Public "-// Sun Microsystems, Inc.//dtd Aplikasi Web 2.3 // en" "http://java.sun.com/dtd/web-app_2_3.dtd"> <web-app> <pplay-name> arketipe yang dibuat aplikasi web </display-name> <! Pemetaan-> <servlet> <servlet-name> springmvc </servlet-name> <servlet-class> org.springframework.web.servlet.dispatcherServlet </servlet-cla SS> <InT-Param> <Param-name> ContextConfigLocation </param-name> <Param-Value> /web-inf/springmvc-servlet.xml </param-value> </itin-param> <!- <Boad-on-startup> 1 </boad-in-startup>-> </servlet> <servlet-papping> <servlet-name> springmvc </servlet-name> <ratl-pattern>/</url-pola> </servlet-mapping> </web-app>

springmvc-servlet.xml

 <? XML Versi = "1.0" encoding = "utf-8"?> <beans xmlns = "http://www.springframework.org/schema/beans" xmlns: xsi = "http://www.w3.org/2001/xmls xmlns: context = "http://www.springframework.org/schema/context" xmlns: mvc = "http://www.springframework.org/schema/mvc" xsi: schemalocation = "http:BaMaM.MFC" xsi: schemalocation = "http:B http://www.springframework.org/schema/beans/spring-teans.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsdhtp://www.springframework.org/schema/mvc http://www.springframework.org/schema/schema/sprammc/schema/srammc.1 Pindai paket dan paket sub-> <konteks: komponen-scan-package = "com.maven01.*" /> <!-Jangan menangani sumber daya statis-> <MVC: Default-Servlet-handler /> <!-Jika Anda menggunakan anotasi, Anda harus mengonfigurasi pengaturan berikut-> <mvc: annotation-driven /> <! pemetaan = "/static/**" location = "/static/"/> <!-Konfigurasikan InternalResourCeviewResolver-> <!-Jika Anda menggunakan anotasi, Anda harus mengonfigurasi pengaturan berikut-> <bean id = "MappingJacksonHttpMessageConverter" class = "org.springframework.http.converter.json.mappingjackson2httpmessageConverter"> <properti name = "SupportedMediatypes"> <list> <value> Aplikasi/json; charset = UTF-8 </ value> </list> </prop Propert> </ bean> <bean> <beansclass = "org.springframework.web.servlet.view.internalResourceview InteroPramework" id = "oLiew name = "prefix" value = "/web-inf/view/"/> <!-suffix-> <properti name = "sufiks" value = ". jsp"/> </ bean> <!-mysql-> <!-memperkenalkan informasi konfigurasi data eksternal-> <beeAnclass = "org.spramework.confacpory.confactory.confactory.confactory. name = "Lokasi"> <value> classpath: jdbc.properties </ value> </property> </ bean> <!-Mengkonfigurasi sumber data-> <bean id = "DataSource" class = "org.springframework.jdbc.datasource.driverManMerDataSource"> <" value="${jdbc.driver}"></property><property name="url" value="${jdbc.url}"></property><property name="username" value="${jdbc.username}"></property><!-- spring and MyBatis are perfectly integrated, and there is no need for mybatis configuration mapping file --><bean ID = "SQLSessionFactory"> <properti name = "DataSource" ref = "DataSource"/> <!-secara otomatis memindai file pemetaan. it-> <bean> <name properti = "basepackage" value = "com.maven01.dao"/> <name properti = "sqlSessionFactoryBeanName" value = "sqlSessionFactory"> </property> </bean> <!-Monfigure Transaction Manager-> <Bean " id = "txManager" class = "org.springframework.jdbc.datasource.datasourCetransactionManager"> <name properti = "DataSource" ref = "DataSource"> </propert> </bean> </bean>

 jdbc.propertiesjdbc.driver = com.mysql.jdbc.driverjdbc.url = jdbc: mysql: // localhost: 3306/karyawan? UseUnicode = true & characterencoding = utf-8jdbc.username = rootjdbc.passer = SQ

Konfigurasi file mapper mybatis

 <? Xml Version = "1.0" encoding = "utf-8"?> <! Doctype mapper public "-// mybatis.org//dtd mapper 3.0 // en" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> namespace = "com.maven01.dao.iemployeedao"> <pilih id = "getAll" resultType = "com.maven01.pojo.employee"> Pilih*darimployeesLimit 1,10 </pilih> </papper>

Struktur DB

Proyek ini menggunakan database sampel MySQL, dan teman -teman yang membutuhkannya dapat mengunduhnya sendiri.

http://www3.ntu.edu.sg/home/ehchua/programming/sql/sampledatabases.html

Deskripsi kode

model

 package com.maven01.pojo;public class Employee {public int emp_no;public String first_name;public int getEmp_no() {return emp_no;}public void setEmp_no(int emp_no) {this.emp_no = emp_no;}public String getFirst_name() {return first_name;}public void setFirst_name (string first_name) {this.first_name = first_name;}}

Dao

 Paket com.maven01.dao; import java.util.list; impor org.springframework.stereotype.repository; impor com.maven01.pojo.employee; antarmuka publik iemployeedao {daftar publik <eployee> getAll ();}

melayani

 Paket com.maven01.service; import java.util.list; import com.maven01.pojo.employee; antarmuka publik iemployeeservice {daftar publik <eployee> getAll ();}

LayananMPL

 Paket com.maven01.service.impl; impor java.util.list; impor org.springframework.beans.factory.annotation.Autowired; impor org.springframework.stereotype.service; impor com.maven01.dao.ieManeedaeoedao; com.maven01.service.*; impor javax.annotation.resource; @servicepublic class peopleServiceImpl mengimplementasikan iemployeeservice {@AutowiredPrivate iemployeedao Dao; Retroka PublicerServiceImpl () {} Daftar publik <Karyawan> getall () {return dao.) {{} Publik <karyawan> getall () {return dao.) {{} PUBLIK <) {GetAlle {) {{) {{) {{) {{{) {{{) {{{) {{{) {{{) {{{) {{{) {{{) {{)

pengontrol

 Paket com.maven01.controller; import java.util.arraylist; import java.util.list; import javax.annotation.resource; impor org.springframework.stereotype.controller; impor org.springframework.web.bind.annotation.rupaping. org.springframework.web.bind.annotation.requestmethod; impor org.springframework.web.bind.annotation.responseBody; impor com.maven01.dto.*; impor com.maven01.pojo.eMireee; impor impor; Impor com.maven01.service.IEmployeeService;@Controller@RequestMapping("/mvc")public class DemoController {@Resourceprivate IEmployeeService employeeService;@RequestMapping(method = RequestMethod.GET, value = "/getEmployeeList", produces = "application/json")public @ResponseBody List<Employee> getEmployeeList() {return stadyweerservice.getall ();}}

Hasil berjalan

Kode proyek ini telah dikirimkan ke git, dan alamat unduhannya adalah https://github.com/hbb0b0/springmybatis.git

Jebakan yang ditemui:

MappersCannerConfigurer dikonfigurasi hanya untuk memasukkan lapisan DAO. Jangan pernah mengkonfigurasi seluruh paket untuk dipindai, jika tidak, kesalahan akan terjadi: tidak ada kacang kualifikasi tipe [com.maven01.service.iemployeeservice] didefinisikan: kacang yang cocok dengan kacang tunggal tetapi menemukan 2: karyawan layanan, iemployeeservice

 <!-Musim semi akan secara otomatis menemukan kelas di bawah antarmuka DAO-> <bean> <name properti = "basepackage" value = "com.maven01.*"/> <Nama properti = "sqlSessionFactoryBeanName" value = "sqlSessionFactory"> </properti. Kualifikasi kacang dari tipe [com.maven01.service.iemployeeservice] didefinisikan: kacang yang cocok dengan kacang tunggal tetapi ditemukan 2: karyawan serviceImpl, iemployeeserviceat org.springframework.beans.factory.support.defaultListableBeanFactory.doresolvedEpendency (leFaUrtoryBeanFactory. Nama paket di mana antarmuka DAO berada, Spring akan secara otomatis menemukan kelas di bawahnya -> <Bean> <nama properti = "Basepackage" value = "com.maven01.dao"/> <name properti = "sqlSessionFactoryBeanName" value = "sqlsessionfactory"> </properti> </bean>

Perhatikan bahwa pencocokan paket mybatis adalah versi yang lebih rendah dari mybatis-spring dan mybatis dan spring.
java.lang.abstractmethoderror: org.mybatis.spring.transaction.springManagedTransaction.getTimeout () l

Meringkaskan

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