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maven环境配置问题

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1

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JDBC中连接数据库Class.Forname()参数问题

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震惊！浏览器报400，竟然是这种原因？

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1

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Nginx负载均衡跳转异常

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1

Nginx

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 源码

worker_processes 1;


events {
worker_connections 1024;
}
http {
include mime.types;
default_type application/octet-stream;
sendfile on;
keepalive_timeout 65;
upstream nbgz {
ip_hash;
server 127.0.0.1:8081 weight=3;
server 127.0.0.1:8082 weight=3;
server 127.0.0.1:8083 weight=3;
}
server {
listen 8780;
server_name localhost;
location / {
root html;
index index.html index.htm;
proxy_pass http://nbgz;
proxy_redirect off; 
proxy_set_header Host $http_host; 
proxy_set_header X-Real-IP $remote_addr; 
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; 
proxy_set_header Cookie $http_cookie; 
chunked_transfer_encoding off; 
proxy_connect_timeout 1;
proxy_read_timeout 30;
proxy_send_timeout 60;
} error_page 500 502 503 504 /50x.html;
location = /50x.html {
root html;
}
}

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DispatcherServlet的作用为什么有的时候会报错，运行流程是什么

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1

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class="cursor-pointer"> 错误截图

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jsp 调用数据库 timestamp 时间异常。

1

DB设计 spring

class="cursor-pointer"> 详细描述

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tomcat启动项目时间过长

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1

jetty/tomcat

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参数校验报错

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1

复盘踩坑

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

class="cursor-pointer"> 源码

import org.springframework.validation.Errors;
import org.springframework.validation.ValidationUtils;
import org.springframework.validation.Validator;

//一个实现了验证接口的类
public class UserValidator implements Validator {
    //指定验证的实体类
    @Override
    public boolean supports(Class<?> clazz) {
        System.out.println("开始验证");
        return User.class.equals(clazz);
    }

    //具体的验证逻辑
    @Override
    public void validate(Object target, Errors errors) {
        ValidationUtils.rejectIfEmpty(errors,"name",
                "Name.is.empty","用户名不能为空");
        User user=(User) target;
        if(null==user.getQq()||"".equals(user.getQq())){
            errors.rejectValue("qq","qq.is.empty",
                    "qq不能为空");
        }
    }
}


    //查询全表:User GET
    @RequestMapping(value = "/UserList", method = RequestMethod.GET)
    //通过获得请求设置初始页
    public ModelAndView queryAll(HttpServletRequest request) {
        ModelAndView modelAndView = new ModelAndView();
        //通过request获得当前页面
        int pageNum=Integer.valueOf(request.getParameter("pageNum"));
        //设置每页记录数
        int pageSize=5;
        //调用分页方法获得当前页面的记录
        PageBean pageBean=userService.findAllUserWithPage(pageNum,pageSize);
        //通过modelAndView来封装数据
        modelAndView.addObject("list", pageBean);
        modelAndView.setViewName("User");
        return modelAndView;
    }

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打包上传服务器后，无法运行jar包

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class="cursor-pointer"> 详细描述

使用 maven-shade-plugin 插件将web项目  打为jar包，设置 main 函数 ；
<plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-shade-plugin</artifactId>
                <version>2.4.3</version>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>shade</goal>
                        </goals>
                        <configuration>
                            <filters>
                                <filter>
                                    <artifact>*:*</artifact>
                                    <excludes>
                                        <exclude>META-INF/*.SF</exclude>
                                        <exclude>META-INF/*.DSA</exclude>
                                        <exclude>META-INF/*.RSA</exclude>
                                    </excludes>
                                </filter>
                            </filters>
                            <transformers>
                                <transformer
                                        implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                                    <mainClass>com.jnshu.Rmi.RmiTest</mainClass>
                                </transformer>
                                <transformer
                                        implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
                                    <resource>META-INF/spring.handlers</resource>
                                </transformer>
                                <transformer
                                        implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
                                    <resource>META-INF/spring.schemas</resource>
                                </transformer>
                            </transformers>
                        </configuration>
                    </execution>
                </executions>
            </plugin>

在本地 测试 能成功 运行 ， 上传 到服务器后 无法 正常启动

class="cursor-pointer"> 错误截图

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Mybatis执行删除和插入数据时报错 integer?

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mybatis

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class="cursor-pointer"> 错误截图