1、在JPA插入时,前台误传ID,数据库若有ID,后台将变为修改。若无将是新增。
2、日期类型接收:
pom新增:
com.fasterxml.jackson.datatype
jackson-datatype-jsr310
2.9.2
yaml配置文件新增:
#全局时间格式定义
spring:
jackson:
date-format: yyyy-MM-dd HH:mm:ss
局部属性在实体类上使用@JSONFormat("yyyy-MM-dd")来指定日期格式。
3、吐槽一个JPA里的问题:我一同事在JPA的repository里写了方法,未调用,然后上传。导致我处理了半天,注销了他的代码后,发现一下就好了。才发现这是随手写的一个方法,且没有@query。
4、在结合redis存储时,报错如下(只截取了主要部分):
java.lang.IllegalArgumentException: DefaultSerializer requires a Serializable payload but received an object of type [com.zz.lb.xx.cc.entity.vineVo.xxVo]
报错大意为这个要存储到redis中的类需要序列化。
5、全局日志的拦截:
本全局日志从Spring4.1以后可以使用。其作用就是修改响应内容。
package com.kindo.vine.filter;
import com.kindo.vine.common.OperationContentLog;
import com.kindo.vine.common.OperationLog;
import com.kindo.vine.utils.JsonUtil;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.MethodParameter;
import org.springframework.http.MediaType;
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;
import org.springframework.http.server.ServletServerHttpRequest;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.mvc.method.annotation.ResponseBodyAdvice;
import javax.servlet.http.HttpServletRequest;
import java.util.Date;
/**
* Created by lingbao on 2017/11/20.
*
* @author lingbao
* @Description
* @Modify
*/
@ControllerAdvice
public class LogAdvice implements ResponseBodyAdvice {
Logger logger = LoggerFactory.getLogger(LogAdvice.class);
@Override
public boolean supports(MethodParameter methodParameter, Class aClass) {
//所有经过GetMapping的注解都不会进行日志记录
if (null != methodParameter.getMethodAnnotation(GetMapping.class)) {
return false;
}
return true;
}
@Override
public Object beforeBodyWrite(Object o, MethodParameter methodParameter, MediaType mediaType, Class aClass, ServerHttpRequest serverHttpRequest, ServerHttpResponse serverHttpResponse) {
try {
HttpServletRequest request = ((ServletServerHttpRequest) serverHttpRequest).getServletRequest();
if (!RequestMethod.GET.toString().equals(request.getMethod())) {
String log = request.getParameter("log");
if (StringUtils.isNotBlank(log)) {
logger.info("记录日志:"+log);
} else
logger.error(request.getServletPath() + "日志为空!");
}
} catch (Exception e) {
logger.error("记录日志错误", e);
}
return o;
}
}
6、前后端分离远程调用:
import com.kindo.vine.common.Constant;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.annotation.Order;
import org.springframework.web.filter.OncePerRequestFilter;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
@Configuration
@WebFilter
public class CorsFilter extends OncePerRequestFilter {
@Override
protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {
response.addHeader("Access-Control-Allow-Origin",request.getHeader("Origin"));
response.addHeader("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE,OPTIONS");
response.addHeader("Access-Control-Allow-Headers", "Content-Type");
response.addHeader("Access-Control-Max-Age", "1800");//30 min
response.setHeader("Access-Control-Allow-Credentials","true");
filterChain.doFilter(request, response);
}
}
其中request.getHeader("Origin")
动态获取远程请求的地址。
redis错误:
java.io.InvalidClassException
是redis转换类错误。序列化错误!
解决办法:
在类中实现序列化,添加private static final long serialVersionUID = 5720718939199613394L;
,然后清除redis缓存(flushall)。
springboot+ElasticSearch5.6遇到的BUG:
错误:availableProcessors is already set to [4], rejecting [4]
。
解决:System.setProperty("es.set.netty.runtime.available.processors", "false");
。
private Settings settings(){
System.setProperty("es.set.netty.runtime.available.processors", "false");
Settings settings = Settings.builder()
.put("cluster.name",clusterName)
.put("client.transport.sniff",true)
.build();
client = new PreBuiltTransportClient(settings);
return settings;
}
springboot 2.0.0.BUILD-SNAPSHOT版本:
针对于实体,主键要有(strategy = GenerationType.IDENTITY)
。否则会报错,测试数据库为MySQL。(报错内容为:Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaConfiguration.class]: Invocation of init method failed; nested exception is org.hibernate.AnnotationException: No identifier specified for entity: com.kindo.lily.entity.Medicine
)
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Integer id;
JPA错误:
自级联时,如果父节点ID为null,在保存时,会报错。
错误内容:
Data was not saved: object references an unsaved transient instance - save the transient instance before flushing
解决:手动将父节点id为null的节点设置为null(setParent(null))。
elasticsearch
报错内容:NamedWriteable [org.elasticsearch.index.query.QueryBuilder][parent_id] is already registered for...
。
诊断:缺少Jar包。
解决:
org.elasticsearch
elasticsearch
5.6.0
org.elasticsearch.client
transport
5.6.0
在2.0.0.BUILD-SNAPSHOT
版本中,因为当初版本仓库不稳定,所以出现启动错误(错误已经不能复原了,大意是netty4 transport error)。导致启动失败。折腾了很久很久,最后研究出来了。所以不稳定的版本少用!!!!
org.elasticsearch
elasticsearch
5.6.0
org.elasticsearch.client
transport
5.6.0
org.elasticsearch.plugin
transport-netty4-client
org.elasticsearch.plugin
transport-netty4-client
5.5.3
boot版本是2.0.0:注入一个@FeignClient 的调用客户端,报错说为null注入失败。最后发现是swagger的版本太低,调至2.6.1了(2.5.x以上)。
错误内容:Cannot create binder factory, no
META-INF/spring.bindersresources found on the classpath
。
修复:没有rabbitmq。添加依赖:
org.springframework.cloud
spring-cloud-starter-stream-rabbit
配置:
spring:
rabbitmq: #RabbitMQ相关的配置
host: localhost
port: 5672
username: guest
password: guest
其中rabbitmq的java端口就是5672,而web端口为15672。使用自带用户名。
在配置cloud时,尽量不要使用{}之类的来表示某个配置信息,如{server.port},会出现There is no known eureka server; cluster server list is empty
错误。
解决:写上具体的值就好了。
Tomcat启动地址冲突:(来自慕课网,未验证)
搜索8080端口的进程,最后一列为pid
netstat -aon|findstr ":8080"
杀掉pid为1234的进程
taskkill /F /pid 1234
以下为本文所参考的地址:
全局日志拦截参考地址:http://blog.csdn.net/u012852374/article/details/53837156。