mybatis编程事务管理参考四

陈辉煌

Spring + mvc，Mybatis整合 （含事务配置，分页功能）

 

Spring + mvc，Mybatis整合 （含事务配置，分页功能）

环境

WIN8 , Eclipse (Juno) , Maven 3.0.4 , Tomcat 7
为了方便测试分页功能，前台使用了jquery的Jqgrid插件。

1.建立项目

1.使用Eclipse新建一个Maven Project，Archetype选择 maven-archetype-webapp。
2.新建的项目中默认只有一个source folder - src/main/resources ,添加另外三个source folder来完善Maven的标准目录结构。

2.配置依赖



<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>jo.geun</groupId>
<artifactId>sampleProj</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>sampleProj Maven Webapp</name>
<url>http://maven.apache.org</url>
<properties>
<spring.version>3.1.3.RELEASE</spring.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.1.1</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.1.1</version>
</dependency>
<dependency>
<groupId>commons-dbcp</groupId>
<artifactId>commons-dbcp</artifactId>
<version>1.4</version>
</dependency>
<dependency>
<groupId>com.oracle</groupId>
<artifactId>ojdbc6</artifactId>
<version>11.2.0.3.0</version>
</dependency>
<dependency>
<groupId>cglib</groupId>
<artifactId>cglib</artifactId>
<version>2.2.2</version>
</dependency>
<dependency>
<groupId>taglibs</groupId>
<artifactId>standard</artifactId>
<version>1.1.2</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-core-asl</artifactId>
<version>1.9.11</version>
</dependency>
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-mapper-asl</artifactId>
<version>1.9.11</version>
</dependency>
</dependencies>
<build>
<finalName>sampleProj</finalName>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.5.1</version>
<configuration>
<source>1.6</source>
<target>1.6</target>
</configuration>
</plugin>
</plugins>
</build>
</project>




 需注意的是，因为Oracle做了些license的限制，Maven Central不提供Oracle的JDBC Driver的下载。我们只能手动下载JAR包（你也可以在Oracle DB或Client的安装目录中找到它），再用install命令注册到本地仓库中。

E:\>mvn install:install-file -Dfile=E:\instantclient_11_2\ojdbc6.jar -DgroupId=com.oracle -DartifactId=ojdbc6 -Dversion=11.2.0.3.0 -Dpackaging=jar
3.web.xml的配置



<?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="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<display-name>Sample Web Application</display-name>
<!-- The definition of the Root Spring Container shared by all Servlets
and Filters -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/spring/root-context.xml</param-value>
</context-param>
<!-- Creates the Spring Container shared by all Servlets and Filters -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!-- Processes application requests -->
<servlet>
<servlet-name>appServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/spring/servlet-context.xml</param-value>
</init-param>
<load-on-startup>0</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>appServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>




 这里简简单单的说明一下吧。。
<context-param/> 节点配置contextConfigLocation属性是为了让ContextLoaderListener找到Spring上下文的位置并加载它，如果不指定contextConfigLocation，ContextLoaderListener会到/WEB-INF/目录下找applicationContext.xml来加载。

<listener/>  节点上配了ContextLoaderListener。它实现了ServletContextListener接口，所以web server启动时ContextLoaderListener能读取到ServletContext，也就能通过<context-param/>指定的Spring上下文的路径来找到上下文并加载它。
当然，如果你不需要Spring来管理你的Bean，可以去掉上面两个节点。
 <servlet/>和<servlet-mapping/>两个节点其实也不用多说，就是告诉容器匹配<url-pattern/>的请求都让Spring的 DispatcherServlet（就是一个Servlet，继承自HttpServlet）来处理。而它会把请求分发给其他控制器。详见Spring reference 16章 。
在WEB-INF目录下创建一个叫Spring的文件夹，上面指定的Spring的两个配置文件会放到这个文件夹内。

4.配置Spring mvc

在web.xml的<servlet/>节点中我们指定了servlet-context.xml。这里可以配拦截器还有视图解析器等，也可以配multipartResolver来实现文件上传功能。



<?xml version="1.0" encoding="UTF-8"?>
<beans:beans xmlns="http://www.springframework.org/schema/mvc"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:beans="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
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">
<!-- DispatcherServlet Context: defines this servlet's request-processing
infrastructure -->
<!-- Enables the Spring MVC @Controller programming model -->
<annotation-driven />
<!-- Handles HTTP GET requests for /resources/** by efficiently serving
up static resources in the ${webappRoot}/resources directory -->
<resources mapping="/resources/**" location="/resources/" />
<!-- Resolves views selected for rendering by @Controllers to .jsp resources
in the /WEB-INF/views directory -->
<beans:bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<beans:property name="prefix" value="/WEB-INF/pages/" />
<beans:property name="suffix" value=".jsp" />
</beans:bean>
<context:component-scan base-package="jo.geun.controller" />
</beans:beans>




 这儿需要注意的是<context:component-scan/>节点。看到很多人问起让Spring来管理事务时候，事务为什么会不起作用，其中也有在这儿犯错的。。
 通常我们会做分层开发，在这个小例子中也分了controller、service 、 dao 三层，由service层来管理事务。
 如果在这个servlet context里面把service层也给scan了，service Bean就会被提前实例化，Spring的事务就没法控制事务对象了。所以一定要让这个扫描器过滤掉service层的扫描。
上面因为package的结构简单，就直接指定了controller层，其实也可以换种方式来写

<context:component-scan base-package="com.geun">
<context:exclude-filter type="annotation"
expression="org.springframework.stereotype.Service" />
</context:component-scan>


用上面的方式会过滤掉所有带@Service注解的类，也可以用正则表达式或AspectJ类型的表达式，具体的参阅官方文档。

5.root-context.xml

这儿主要包含了数据源及事务的配置,还有dao、service层bean的定义。



<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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">
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<!-- Connection Info -->
<property name="driverClassName" value="oracle.jdbc.driver.OracleDriver" />
<property name="url" value="jdbc:oracle:thin:@*******:1521:**" />
<property name="username" value="**" />
<property name="password" value="**" />
<!-- Connection Pooling DBCP -->
<property name="initialSize" value="5" />
<property name="maxActive" value="100" />
<property name="maxIdle" value="30" />
<property name="maxWait" value="1000" />
<property name="poolPreparedStatements" value="true" />
<property name="defaultAutoCommit" value="false" />
</bean>
<bean id="transactionManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource" />
</bean>
<tx:annotation-driven transaction-manager="transactionManager" />
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="configLocation" value="WEB-INF/mybatis/mybatis-conf.xml" />
</bean>
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="jo.geun.dao;" />
</bean>
<context:component-scan base-package="jo.geun.service" />
</beans>




MapperScannerConfigurer会寻找指定包下的Mapper并自动将它们注册到到MapperFactoryBean代理工厂，这个代理工厂可以让你的mapper interface直接注入到其他bean中，而你完全不需要实现这个接口。不嫌累，也可以一个一个的注册Mapper接口,如下。

<bean id="sampleMapper" class="org.mybatis.spring.mapper.MapperFactoryBean">
<property name="mapperInterface" value="jo.geun.dao.SampleMapper" />
<property name="sqlSessionFactory" ref="sqlSessionFactory" />
</bean>


 6.mybatis-conf.xml

WEB-INF目录下创建文件夹mybatis,来放置它。
 



<?xml version="1.0" encoding="UTF-8" ?>  
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN"  
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<settings>
<setting name="cacheEnabled" value="true" />
<setting name="lazyLoadingEnabled" value="true" />
<setting name="aggressiveLazyLoading" value="false" />
<setting name="multipleResultSetsEnabled" value="true" />
<setting name="useColumnLabel" value="true" />
<setting name="autoMappingBehavior" value="FULL" />
<setting name="defaultExecutorType" value="SIMPLE" />
<setting name="defaultStatementTimeout" value="25000" />
</settings>
<plugins>
<plugin interceptor="jo.geun.utility.PagePlugin">
<property name="dialect" value="oracle" />
<property name="pageSqlId" value=".*ListPage.*" />
</plugin>
</plugins>
</configuration>  




如果mapper interface和mapper xml取一样的文件名，放到同一个包下就不用另配<mappers/>节点来告诉映射文件的位置了。
ibatis更名为mybatis以后加入了plugin功能，可以用它拦截执行语句的调用并扩展核心功能（Executer,StatementHandler 等）。这里我们用它来实现分页功能。
在之前在src/main/java下建5个package，附图


7.通过Mybatis的plugin做分页功能

utility包下新建一个POJO类。



package jo.geun.utility;
import java.io.Serializable;
public class PageInfo implements Serializable {
private static final long serialVersionUID = 587754556498974978L;
private int showCount = 10;
private int totalPage;
private int totalResult;
private int currentPage;
private int currentResult;
private String sortField;
private String order;
//omit getter/setter methods ....
   
}





反射辅助类



package jo.geun.utility;
import java.lang.reflect.Field;

public class ReflectHelper {
public static Field getFieldByFieldName(Object obj, String fieldName) {  
for (Class<?> superClass = obj.getClass(); superClass != Object.class; superClass = superClass  
.getSuperclass()) {  
try {  
return superClass.getDeclaredField(fieldName);  
} catch (NoSuchFieldException e) {  
}  
}  
return null;  
}  
/**
* Obj fieldName의 속성값 가져오기.  
* @param obj
* @param fieldName
* @return
* @throws SecurityException
* @throws NoSuchFieldException
* @throws IllegalArgumentException
* @throws IllegalAccessException
*/  
public static Object getValueByFieldName(Object obj, String fieldName)  
throws SecurityException, NoSuchFieldException,  
IllegalArgumentException, IllegalAccessException {  
Field field = getFieldByFieldName(obj, fieldName);  
Object value = null;  
if(field!=null){  
if (field.isAccessible()) {  
value = field.get(obj);  
} else {  
field.setAccessible(true);  
value = field.get(obj);  
field.setAccessible(false);  
}  
}  
return value;  
}  
/**
* obj fieldName의 속성값 설정.
* @param obj
* @param fieldName
* @param value
* @throws SecurityException
* @throws NoSuchFieldException
* @throws IllegalArgumentException
* @throws IllegalAccessException
*/  
public static void setValueByFieldName(Object obj, String fieldName,  
Object value) throws SecurityException, NoSuchFieldException,  
IllegalArgumentException, IllegalAccessException {  
Field field = obj.getClass().getDeclaredField(fieldName);  
if (field.isAccessible()) {  
field.set(obj, value);  
} else {  
field.setAccessible(true);  
field.set(obj, value);  
field.setAccessible(false);  
}  
}  
}




 
拦截器 ，通过拦截StatementHandler的prepare方法来实现分页



package jo.geun.utility;
import java.lang.reflect.Field;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import javax.xml.bind.PropertyException;
import org.apache.ibatis.builder.xml.dynamic.ForEachSqlNode;
import org.apache.ibatis.executor.ErrorContext;
import org.apache.ibatis.executor.ExecutorException;
import org.apache.ibatis.executor.statement.BaseStatementHandler;
import org.apache.ibatis.executor.statement.RoutingStatementHandler;
import org.apache.ibatis.executor.statement.StatementHandler;
import org.apache.ibatis.mapping.BoundSql;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.mapping.ParameterMapping;
import org.apache.ibatis.mapping.ParameterMode;
import org.apache.ibatis.plugin.Interceptor;
import org.apache.ibatis.plugin.Intercepts;
import org.apache.ibatis.plugin.Invocation;
import org.apache.ibatis.plugin.Plugin;
import org.apache.ibatis.plugin.Signature;
import org.apache.ibatis.reflection.MetaObject;
import org.apache.ibatis.reflection.property.PropertyTokenizer;
import org.apache.ibatis.session.Configuration;
import org.apache.ibatis.type.TypeHandler;
import org.apache.ibatis.type.TypeHandlerRegistry;
@Intercepts({ @Signature(type = StatementHandler.class, method = "prepare", args = { Connection.class }) })
public class PagePlugin implements Interceptor {
private static String dialect = "";
private static String pageSqlId = "";
@SuppressWarnings("unchecked")
public Object intercept(Invocation ivk) throws Throwable {
if (ivk.getTarget() instanceof RoutingStatementHandler) {
RoutingStatementHandler statementHandler = (RoutingStatementHandler) ivk
.getTarget();
BaseStatementHandler delegate = (BaseStatementHandler) ReflectHelper
.getValueByFieldName(statementHandler, "delegate");
MappedStatement mappedStatement = (MappedStatement) ReflectHelper
.getValueByFieldName(delegate, "mappedStatement");
if (mappedStatement.getId().matches(pageSqlId)) {
BoundSql boundSql = delegate.getBoundSql();
Object parameterObject = boundSql.getParameterObject();
if (parameterObject == null) {
throw new NullPointerException("parameterObject가 비여있음.");
} else {
Connection connection = (Connection) ivk.getArgs()[0];
String sql = boundSql.getSql();
String countSql = "select count(0) from (" + sql + ") ";
PreparedStatement countStmt = connection
.prepareStatement(countSql);
BoundSql countBS = new BoundSql(
mappedStatement.getConfiguration(), countSql,
boundSql.getParameterMappings(), parameterObject);
setParameters(countStmt, mappedStatement, countBS,
parameterObject);
ResultSet rs = countStmt.executeQuery();
int count = 0;
if (rs.next()) {
count = rs.getInt(1);
}
rs.close();
countStmt.close();
PageInfo page = null;
if (parameterObject instanceof PageInfo) {
page = (PageInfo) parameterObject;
page.setTotalResult(count);
} else if(parameterObject instanceof Map){
Map<String, Object> map = (Map<String, Object>)parameterObject;
page = (PageInfo)map.get("page");
if(page == null)
page = new PageInfo();
page.setTotalResult(count);
}else {
Field pageField = ReflectHelper.getFieldByFieldName(
parameterObject, "page");
if (pageField != null) {
page = (PageInfo) ReflectHelper.getValueByFieldName(
parameterObject, "page");
if (page == null)
page = new PageInfo();
page.setTotalResult(count);
ReflectHelper.setValueByFieldName(parameterObject,
"page", page);
} else {
throw new NoSuchFieldException(parameterObject
.getClass().getName());
}
}
String pageSql = generatePageSql(sql, page);
ReflectHelper.setValueByFieldName(boundSql, "sql", pageSql);
}
}
}
return ivk.proceed();
}
/**
* 瀵筍QL鍙傛暟(?)璁惧�,鍙傝�org.apache.ibatis.executor.parameter.
* DefaultParameterHandler
*
* @param ps
* @param mappedStatement
* @param boundSql
* @param parameterObject
* @throws SQLException
*/
private void setParameters(PreparedStatement ps,
MappedStatement mappedStatement, BoundSql boundSql,
Object parameterObject) throws SQLException {
ErrorContext.instance().activity("setting parameters")
.object(mappedStatement.getParameterMap().getId());
List<ParameterMapping> parameterMappings = boundSql
.getParameterMappings();
if (parameterMappings != null) {
Configuration configuration = mappedStatement.getConfiguration();
TypeHandlerRegistry typeHandlerRegistry = configuration
.getTypeHandlerRegistry();
MetaObject metaObject = parameterObject == null ? null
: configuration.newMetaObject(parameterObject);
for (int i = 0; i < parameterMappings.size(); i++) {
ParameterMapping parameterMapping = parameterMappings.get(i);
if (parameterMapping.getMode() != ParameterMode.OUT) {
Object value;
String propertyName = parameterMapping.getProperty();
PropertyTokenizer prop = new PropertyTokenizer(propertyName);
if (parameterObject == null) {
value = null;
} else if (typeHandlerRegistry
.hasTypeHandler(parameterObject.getClass())) {
value = parameterObject;
} else if (boundSql.hasAdditionalParameter(propertyName)) {
value = boundSql.getAdditionalParameter(propertyName);
} else if (propertyName
.startsWith(ForEachSqlNode.ITEM_PREFIX)
&& boundSql.hasAdditionalParameter(prop.getName())) {
value = boundSql.getAdditionalParameter(prop.getName());
if (value != null) {
value = configuration.newMetaObject(value)
.getValue(
propertyName.substring(prop
.getName().length()));
}
} else {
value = metaObject == null ? null : metaObject
.getValue(propertyName);
}
TypeHandler typeHandler = parameterMapping.getTypeHandler();
if (typeHandler == null) {
throw new ExecutorException(
"There was no TypeHandler found for parameter "
+ propertyName + " of statement "
+ mappedStatement.getId());
}
typeHandler.setParameter(ps, i + 1, value,
parameterMapping.getJdbcType());
}
}
}
}
/**
* 鏍规嵁鏁版嵁搴撴柟瑷�紝鐢熸垚鐗瑰畾鐨勫垎椤祍ql
*
* @param sql
* @param page
* @return
*/
private String generatePageSql(String sql, PageInfo page) {
if (page != null && (dialect !=null || !dialect.equals(""))) {
StringBuffer pageSql = new StringBuffer();
if ("mysql".equals(dialect)) {
pageSql.append(sql);
pageSql.append(" limit " + page.getCurrentResult() + ","
+ page.getShowCount());
} else if ("oracle".equals(dialect)) {
pageSql.append("select * from (select tmp_tb.*,ROWNUM row_id from (");
pageSql.append(sql);
pageSql.append(")  tmp_tb where ROWNUM<=");
pageSql.append(page.getCurrentResult() + page.getShowCount());
pageSql.append(") where row_id>");
pageSql.append(page.getCurrentResult());
}
return pageSql.toString();
} else {
return sql;
}
}
public Object plugin(Object arg0) {
// TODO Auto-generated method stub
return Plugin.wrap(arg0, this);
}
public void setProperties(Properties p) {
dialect = p.getProperty("dialect");
if (dialect ==null || dialect.equals("")) {
try {
throw new PropertyException("dialect property is not found!");
} catch (PropertyException e) {
// TODO Auto-generated catch block
                e.printStackTrace();
}
}
pageSqlId = p.getProperty("pageSqlId");
if (dialect ==null || dialect.equals("")) {
try {
throw new PropertyException("pageSqlId property is not found!");
} catch (PropertyException e) {
// TODO Auto-generated catch block
                e.printStackTrace();
}
}
}
}




 看代码应该最容易理解吧，BoundSql 对象的sql字段是mybatis最终会执行的SQL语句,上面就是用处理过的sql替换原Sql。

 8.dao层（映射文件及接口)的编写

在dao包下建立
SampleMapper.xml



<?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">
<mapper namespace="jo.geun.dao.SampleMapper">
<select id="getMemberListPage" resultType="jo.geun.entity.Member">
select * from member_sap
</select>
</mapper>




SampleMapper.java



package jo.geun.dao;
import java.util.List;
import jo.geun.entity.Member;
import jo.geun.utility.PageInfo;
import org.apache.ibatis.annotations.Param;
public interface SampleMapper {
List<Member> getMemberListPage(@Param("page") PageInfo page);
}





这儿只有一个select语句，我们用它来测试分页功能。
Member只弄了两个字段，如下。



package jo.geun.entity;
import java.io.Serializable;
public class Member implements Serializable {
private static final long serialVersionUID = -3138863613422043759L;
private String sabun = "";
private String registno = "";
//omit getter/setter
}




 

9.service层的编写



package jo.geun.service;
import java.util.List;
import jo.geun.dao.SampleMapper;
import jo.geun.entity.Member;
import jo.geun.utility.PageInfo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
@Service
public class SampleService {
@Autowired
SampleMapper sampleMapper;
public List<Member> getMemberList(PageInfo pageInfo){
return sampleMapper.getMemberListPage(pageInfo);
}
}




@Service（下面还会有一个@Controller）注解是用来标注一个Bean的,spring会根据我们在上面配的 component-scan节点来扫描注册这些bean。它会根据类名实例化一个首字母为小写的bean，也可以给它一个参数来自定义bean id，如@Service("这样")。他的作用跟Spring配置文件里配一个普通bean是一样的。

<bean id="sampleService" class="jo.geun.service.SampleService" />


@Autowired 可以对类成员变量、方法及构造函数进行标注，实现bean的自动装配（在Spring容器中找一个跟相应字段名一样的bean id来装配）。

10.Controller

在编写Controller以前，我们在写一个POJO叫JsonResponse。其实这个类跟json没什么关系。我们在前端会用jquery的 jqgrid插件，它需要一个Json格式的数据源，我们就结合这个JsonResponse类、spring web以及jackson lib来格式化Json数据。
 



package jo.geun.utility;
import java.io.Serializable;
import java.util.List;
public class JsonResponse<T extends Serializable> {
/**
* Current page
*/
private int page;
/**
* Total pages
*/
private int total;
/**
* Total number of records
*/
private int records;
/**
* Contains the actual data
*/
private List<T> rows;
public JsonResponse() {
}
public JsonResponse(List<T> rows, PageInfo page) {
this.rows = rows;
this.total = page.getTotalPage();
this.records = page.getTotalResult();
this.page = page.getCurrentPage();
}
//omit getter/setter methods ....

}




 
SampleController



package jo.geun.controller;
import java.util.List;
import jo.geun.entity.Member;
import jo.geun.service.SampleService;
import jo.geun.utility.JsonResponse;
import jo.geun.utility.PageInfo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
@Controller
public class SampleController {
@Autowired
SampleService sampleService;
@RequestMapping("/home")
public String home() {
return "home";
}
@ResponseBody
@RequestMapping("/data")
public JsonResponse<Member> getData(PageInfo pageInfo) {
List<Member> list = sampleService.getMemberList(pageInfo);
JsonResponse<Member> response = new JsonResponse<Member>(list, pageInfo);
return response;
}
}




11.编写jsp

先下载 jquery,jquery ui,jqgrid 。然后webapp目录下建resources文件夹来放他们（目录结构看下面jsp里的引用吧。。）。
WEB-INF/pages目录下建home.jsp
 
 



<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<link rel="stylesheet" type="text/css" media="screen"
href="<c:url value="/resources/styles/jquery-ui-1.9.1.custom.min.css"/>" />
<link rel="stylesheet" type="text/css" media="screen"
href="<c:url value="/resources/styles/ui.jqgrid.css"/>" />
<script src="<c:url value="/resources/js/jquery-1.8.2.js"/>"
type="text/javascript"></script>
<script type="text/javascript"
src="<c:url value="/resources/js/jquery-ui-1.9.1.custom.min.js"/>"></script>
<script src="<c:url value="/resources/js/jquery.jqGrid.min.js"/>"
    type="text/javascript"></script>
<script src="<c:url value="/resources/js/grid.locale-en.js"/>"
type="text/javascript"></script>
<script type="text/javascript">
$(document).ready(function() {
$("#grid").jqGrid({
url : 'data',
datatype : 'json',
mtype : 'POST',
colNames : [ 'sabun', 'registno' ],
colModel : [ {
name : 'sabun',
index : 'sabun',
width : 5
}, {
name : 'registno',
index : 'registno',
width : 5
} ],
rowList : [ 10, 20, 40, 60 ],
pager : '#pager',
sortname : '',
sortorder : "desc",
height : 240,
width : 480,
rowNum : 10,
caption : "Sample App ",
pgtext : "当前: {0} /{1}",
recordtext : "View {0} - {1} of {2}",
emptyrecords : "Empty records",
rownumbers : true,
viewrecords : true,
scrollrows : true,
loadonce : false,
loadComplete : function() {
},
prmNames : {
page : 'currentPage',
rows : 'showCount',
sort : 'sortField',
order : 'order'
},
jsonReader : {
root : "rows",
page : "page",
total : "total",
records : "records",
repeatitems : false,
cell : "cell",
id : "id"
}
}).navGrid("#pager", {
edit : false,
add : false,
del : false,
search : false
});
});
</script>
<title>Insert title here</title>
</head>
<body>
<table id="grid"></table>
<div id="pager"></div>
</body>
</html>




12.Run App


 上传源码，提取码为：ccff
http://l13.yunpan.cn/lk/sVt2FiVeDpcaX