为spring get请求添加自定义的参数处理操作(如下划线转驼峰)

1.生成自己的注解（为了确定在哪些位置使用）

/** * 关闭patch delete的model处理，否则会报错 */@Target({ElementType.METHOD})@Retention(RetentionPolicy.RUNTIME)@Documentedpublic @interface AliasProcessor {}

/** * 处理Get 请求参数的驼峰问题 * @author lw */@Target(ElementType.FIELD)@Retention(RetentionPolicy.RUNTIME)public @interface ValueFrom { /** * 参数名(别名)列表 */ String[] value();}

2.实现自己的ServletModelAttributeMethodProcessor

/** * 为了减少使用 @RequestPath 将get参数封装到实体类中 重写ModelAttributeMethodProcessor * 注：由于get请求为非raw请求，spring默认使用@ModelArrtribute注解，不会自动将下划线的数据转为驼峰数据 * 所以需要自定义一个处理器，进行该操作 * * @author lw */public class AliasModelAttributeMethodProcessor extends ServletModelAttributeMethodProcessor { private ApplicationContext applicationContext; /** * 过滤掉patch请求，防止报错 */ @Override public boolean supportsParameter(MethodParameter parameter) { return parameter.getMethodAnnotation(AliasProcessor.class)!=null; } public AliasModelAttributeMethodProcessor(ApplicationContext applicationContext) { super(true); this.applicationContext=applicationContext; } @Override protected void bindRequestParameters(WebDataBinder binder, NativeWebRequest request) { AliasDataBinder aliasBinder = new AliasDataBinder(binder.getTarget(), binder.getObjectName()); RequestMappingHandlerAdapter requestMappingHandlerAdapter = this.applicationContext.getBean(RequestMappingHandlerAdapter.class); requestMappingHandlerAdapter.getWebBindingInitializer().initBinder(aliasBinder); aliasBinder.bind(request.getNativeRequest(ServletRequest.class)); }}

3.自己的数据处理类

/** * 重新数据处理类 * @author lw */public class AliasDataBinder extends ExtendedServletRequestDataBinder { public AliasDataBinder(Object target, String objectName) { super(target, objectName); } /** * 复写addBindValues方法 * @param mpvs 这里面存的就是请求参数的key-value对 * @param request 请求本身, 这里没有用到 */ @Override protected void addBindValues(MutablePropertyValues mpvs, ServletRequest request) { super.addBindValues(mpvs, request); // 处理要绑定参数的对象 Class<?> targetClass = getTarget().getClass(); // 获取对象的所有字段(拿到Test类的字段) Field[] fields = targetClass.getDeclaredFields(); // 处理所有字段 for (Field field : fields) { // 原始字段上的注解 ValueFrom valueFromAnnotation = field.getAnnotation(ValueFrom.class); // 若参数中包含原始字段或者字段没有别名注解, 则跳过该字段 if (mpvs.contains(field.getName()) || valueFromAnnotation == null) { continue; } // 参数中没有原始字段且字段上有别名注解, 则依次取别名列表中的别名, 在参数中最先找到的别名的值赋值给原始字段 for (String alias : valueFromAnnotation.value()) { // 若参数中包含该别名, 则把别名的值赋值给原始字段 if (mpvs.contains(alias)) { // 给原始字段赋值 mpvs.add(field.getName(), mpvs.getPropertyValue(alias).getValue()); // 跳出循环防止取其它别名 break; } } } }}

4.注册到spring中

/** * 为了获得context需要实现ApplicationContextAware接口 * @author lw */@Configurationpublic class WebmvcConfig implements ApplicationContextAware { @Autowired private RequestMappingHandlerAdapter adapter; private ApplicationContext applicationContext = null; @Override public void setApplicationContext(ApplicationContext applicationContext) throws BeansException { this.applicationContext=applicationContext; } /** * 将自定义的processor添加到adapter中 */ @PostConstruct protected void injectSelfMethodArgumentResolver() { List<HandlerMethodArgumentResolver> argumentResolvers = new ArrayList<>(); argumentResolvers.add(new AliasModelAttributeMethodProcessor(this.applicationContext)); argumentResolvers.addAll(adapter.getArgumentResolvers()); adapter.setArgumentResolvers(argumentResolvers); }}

补充知识：springboot - mybatis - 下划线与驼峰自动转换 mapUnderscoreToCamelCase

以前都是在mybatis.xml中来配置，但是spring boot不想再用xml配置文件。网上搜寻了好久，才找到设置办法：

sessionFactoryBean.getObject().getConfiguration().setMapUnderscoreToCamelCase(true);

db配置文件源码：

package com.vip.qa.vop.config;import com.alibaba.druid.pool.DruidDataSource;import org.apache.ibatis.session.SqlSessionFactory;import org.mybatis.spring.SqlSessionFactoryBean;import org.mybatis.spring.annotation.MapperScan;import org.springframework.beans.factory.annotation.Qualifier;import org.springframework.beans.factory.annotation.Value;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.context.annotation.Primary;import org.springframework.core.io.support.PathMatchingResourcePatternResolver;import org.springframework.jdbc.datasource.DataSourceTransactionManager;import javax.sql.DataSource;import java.util.Properties;/** * Created by danny.yao on 2017/10/25. */@Configuration@MapperScan(basePackages = VOPDataSourceConfig.PACKAGE, sqlSessionFactoryRef = 'vopSqlSessionFactory')public class VOPDataSourceConfig { static final String PACKAGE = 'com.vip.qa.vop.mapper.vop'; @Value('${vop.datasource.url}') private String dbUrl; @Value('${vop.datasource.username}') private String dbUser; @Value('${vop.datasource.password}') private String dbPassword; @Value('${vop.datasource.driver-class-name}') private String dbDriver; @Bean(name = 'vopDataSource') @Qualifier @Primary public DataSource vopDataSource() { DruidDataSource dataSource = new DruidDataSource(); dataSource.setDriverClassName(dbDriver); dataSource.setUrl(dbUrl); dataSource.setUsername(dbUser); dataSource.setPassword(dbPassword); return dataSource; } @Bean(name = 'vopSqlSessionFactory') @Qualifier @Primary public SqlSessionFactory vopSqlSessionFactory(@Qualifier('vopDataSource') DataSource scepDataSource) throws Exception { final SqlSessionFactoryBean sessionFactoryBean = new SqlSessionFactoryBean(); sessionFactoryBean.setDataSource(scepDataSource); PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver(); sessionFactoryBean.setMapperLocations(resolver.getResources('classpath:/mybatis/vop/*.xml')); sessionFactoryBean.getObject().getConfiguration().setMapUnderscoreToCamelCase(true); return sessionFactoryBean.getObject(); }// @Bean(name = 'vopTransactionManager')// @Qualifier// public DataSourceTransactionManager testDataTransactionManager() {// return new DataSourceTransactionManager(vopDataSource());// }}

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