IT修真院·坑乎 | Java(后端),CSS(前端),JavaScript(前端),PM(产品经理),UI(交互设计),QA(测试),Android(安卓APP),iOS(苹果APP),OP(运维),Python(后端)日常在线问答学习平台

该问题已被官方收录

脚本错误

1

linux命令

class="cursor-pointer"> 详细描述

#部署
function deployDir(){
  echo"准备部署中.."
  if [-d"$DeployDir"]
  then
  echo"项目SSM_Demo已存在是否需要重新部署？(y/n)"
  #接收输入的值，赋值给answer
  read -p "(默认:n):"answer
  #-z如果string为空
  [-z${answer}]&&answer="n"
  if ["$answer}"=="y"]||["${answer}"=="Y"]
  then
  echo"开始清理原目录${DeployDir}..."
  #删除原始目录
  rm -rf ${DeployDir} >/dev/null 2>&1
  sleep 1
  action"原项目已清理完成" /bin/true  wwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwww
  else
  echo"已退出部署"
  exit 1
  fi
  fi
  #解压项目到本目录
  echo "解压项目到${work_path}/SSM_Demo中..."
  unzip -op SSM_Demo.war -d ${work_path}SSM_Demo >/dev/null 2>&1
  #防止解压未完成
  sleep 5
  if [ $? -ne 0 ]
  then
  action "SSM_Demo解压失败" /bin/false
 exit 1
  fi
  #上面命令解压成功为0
  if [ $? -eq 0 ]
  then
  action "解压完成" /bin/true
  echo "部署中..."
  mv ${work_path}/SSM_Demo ${DeployDir} >/dev/null 2>&1
  fi
  sleep 3
  if [ $? -eq 0 ]
  then
  action "部署完成..." /bin/true
  #清理解压文件
  rm -rf ${work_path}/SSM_Demo >/dev/null 2>&1
  #部署完成重启tomcat
  restart
  action "清理解压文件完成..." /bin/true
  exit 0
  else
  action "部署失败..." /bin/false
  #清理解压文件
  rm -rf ${work_path}/SSM_Demo >/dev/null 2>&1
  action "清理解压文件完成..." /bin/true
  exit 1
  fi

class="cursor-pointer"> 错误截图

该问题已被官方收录

JWT为什么要设置http-only=true？

1

会话管理

class="cursor-pointer"> 详细描述

该问题已被官方收录

多模块打包

0

1

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

该问题已被官方收录

可以为null的字段但是在jsp上必须要填入所有参数

0

1

JSP

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

class="cursor-pointer"> 源码

<form action="${pageContext.request.contextPath}/regist" class="form-horizontal" role="form" method="post">
    <div class="form-group">
        <label for="username" class="col-sm-2 control-label">*username</label>
        <div class="col-sm-2">
            <input type="text" class="form-control" id="username" name="username"
                    placeholder="用户名：8-16位英文数字">
        </div>
    </div>
    <div class="form-group">
        <label for="password" class="col-sm-2 control-label">*password</label>
        <div class="col-sm-2">
            <input type="text" class="form-control" id="password" name="password"
                    placeholder="输入密码">
        </div>
    </div>
    <div class="form-group">
        <label for="email" class="col-sm-2 control-label">*email</label>
        <div class="col-sm-2">
            <input type="text" class="form-control" id="email" name="email"
                     placeholder="输入邮箱">
        </div>
    </div>
    <div class="form-group">
        <label for="name" class="col-sm-2 control-label">*name</label>
        <div class="col-sm-2">
            <input type="text" class="form-control" id="name" name="name"
                    placeholder="输入姓名">
        </div>
    </div>
    <%--<div class="form-group">--%>
        <%--<label for="sex" class="col-sm-2 control-label">sex</label>--%>
        <%--<div class="col-sm-2">--%>
            <%--<input type="text" class="form-control" id="sex" name="sex"--%>
                   <%--VALUE="" placeholder="输入性别">--%>
        <%--</div>--%>
    <%--</div>--%>
    <div class="form-group">
        <label for="introduce" class="col-sm-2 control-label">*introduce</label>
        <div class="col-sm-2">
            <input type="text" class="form-control" id="introduce" name="introduce"
                    placeholder="输入个人介绍">
        </div>
    </div>
    <div class="form-group">
        <label for="status" class="col-sm-2 control-label">*status</label>
        <div class="col-sm-2">
            <input type="text" class="form-control" id="status" name="status"
                    placeholder="输入在学状态">
        </div>
    </div>
    <div class="form-group">
        <label for="major" class="col-sm-2 control-label">major</label>
        <div class="col-sm-2">
            <input type="text" class="form-control" id="major" name="major"
                   placeholder="输入主修">
        </div>
    </div>
    <div class="form-group">
        <label for="classes" class="col-sm-2 control-label">classes</label>
        <div class="col-sm-2">
            <input type="text" class="form-control" id="classes" name="classes"
                    placeholder="输入课程">
    </div>
    </div>
    <div class="form-group">
        <label for="QQ" class="col-sm-2 control-label">QQ</label>
        <div class="col-sm-2">
            <input type="text" class="form-control" id="QQ" name="QQ"
                    placeholder="输入QQ">
        </div>
    </div>
    <div>
    <input type="submit" name="提交">
    </div>
</form>



@RequestMapping(value = "/regist", method = RequestMethod.POST)
    public ModelAndView regist(User user) {
        System.out.println("注册");
        ModelAndView mav = new ModelAndView();
        String prompt;
        String str = user.getUsername();
        String pas = user.getPassword();
        User user1 = new User();
        //正则匹配
        boolean confirmU = Verification.regexUsername(str);
        boolean confirmP = Verification.regexPassword(pas);
        if (confirmU) {
            try {
                user1 = userService.findByUsername(str);
            } catch (Exception e) {
                e.printStackTrace();
            }
            if (user1 == null) {
        //表示通用唯一标识符(UUID)的类。UUID表示一个128位的值
        UUID uuid = UUID.randomUUID();
        String salt = uuid.toString().substring(10);
                System.out.println("salt"+salt);
        //进行SHA加密
        pas = SHA.getResult(pas);

        user.setSalt(salt);
        //进行salt加密
        pas = SHA.getSHAwithSalt(pas,salt);
        //存入加密后的密码
        user.setPassword(pas);
                System.out.println("密码"+pas);
                userService.regist(user);
                //注册成功后跳转index.jsp页面
                prompt = "注册成功";
            } else {
                prompt = "注册失败,用户名已存在";
                logger.info("注册失败,用户名已存在");
            }
        } else {
            prompt = "注册失败,账号格式不对";
            logger.info("账号格式不对");
        }
        mav.addObject("prompt", prompt);
        mav.setViewName("prompt");
        return mav;
    }

该问题已被官方收录

三层架构中使用策略模式，会使得三层架构中使用DAO层出现异常

1

第三方API调用

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

class="cursor-pointer"> 源码

controller
	// 执行上传图片到阿里云
	@RequestMapping(value = "/uploadToAliYun", method = RequestMethod.POST)
	@ResponseBody
	public void userPhotoUploadToALiYun(@RequestParam("file") MultipartFile file, HttpServletRequest request,
										HttpServletResponse response) throws IOException {

		String result = null;
		// 使用策略模式
		UserPhotoUploadStrategyContext context = new UserPhotoUploadStrategyContext(new UserPhotoUploadToAliYunOSSImpl());
		context.executeUserPhotoUploadStrategy(request,response,file);

		// 上传文件
		// result = userPhotoUploadToAliYunOSS.userPhotoUploadToOSS(request, response, file);
		PrintWriter out = response.getWriter();
		out.print(result);
		out.flush();
		out.close();
		logger.info("上传阿里云返回结果：" + result );

	}


services:
public interface UserPhotoUploadStrategy {


	String userPhotoUploadToOSS(HttpServletRequest request, HttpServletResponse response,
								MultipartFile file) throws IOException;

}


实现类：

	/**
	 *
	 * @param request 请求信息
	 * @param response 响应信息
	 * @param file 文件输入流
	 * @return key 存在于OSS 的键值
	 * @throws IOException IO流异常
	 */
	@Override
	public String userPhotoUploadToOSS(HttpServletRequest request, HttpServletResponse response,
									   MultipartFile file) throws IOException {

		applicationContext.getBean("oSSUtilsByALiYun");

		String key = "";
		String result ="";

				// 获取上传前源文件名、文件大小
		String originalFileName = file.getOriginalFilename();
		Long originalFileSize  = file.getSize();
		logger.info("上传前的文件名：" + originalFileName);

		// 将 multipartfilein 转化为 inputstream流
		CommonsMultipartFile cFile = (CommonsMultipartFile) file;
		DiskFileItem fileItem = (DiskFileItem) cFile.getFileItem();
		InputStream inputStream = fileItem.getInputStream();

		if (!file.isEmpty()){
			OSSClient ossClient = task07.util.aliyun.oss.OSSUtilsByALiYun.getOSSClient();
			String newFileName = null;
			if (originalFileName.length()>0){
				newFileName = UUID.randomUUID() +"";
			}
			// 将文件上传并获得返回值 key(文件名称)
			key = OSSUtilsByALiYun.uploadObject2OSS(ossClient, inputStream,
					OSSUtilsByALiYun.getBucketName(), originalFileName,newFileName,
					originalFileSize,OSSUtilsByALiYun.getFolder());

		}
		//将文件名写入数据库
		if (!key.equals("")){
			HttpSession userNamesession =request.getSession();
			String userName = (String) userNamesession.getAttribute("userName");

			if (userName.equals(null)){
				logger.info("写入数据库出错，用户名为 null");

			}

			logger.info("userName:" + userName );
			logger.info("key:" + key );

			System.out.println(userLoginDao);
			System.out.println(userLoginDao.queryByName(userName).toString());
			userLoginDao.updateHeadPhoto(userName,key);

			UserLogin userLoginText = userLoginDao.queryByName(userName);
			String databaseHeadPho =  userLoginText.getHead_photo();
			logger.info("写入数据库的key 值为： " + databaseHeadPho);
			// 将 key 值写入数据库


			if (databaseHeadPho.equals(key)){
				logger.info("写入文件一致，上传成功！");
				result = "文件上传成功!";
			}else{
				result = "上传成功，写入数据库不一致!";
			}


		}else {
			logger.info("文件上传失败！");
			result = "文件上传失败!";
		}

		return result;
	}
}
 
策略模式的context :
public class UserPhotoUploadStrategyContext {


	private UserPhotoUploadStrategy userPhotoUploadStrategy;


	public UserPhotoUploadStrategyContext( UserPhotoUploadStrategy userPhotoUploadStrategy){
		this.userPhotoUploadStrategy = userPhotoUploadStrategy;
	}

	public String executeUserPhotoUploadStrategy(HttpServletRequest request, HttpServletResponse response,
												 MultipartFile file) throws IOException {
		System.out.println("context 之前");

		return userPhotoUploadStrategy.userPhotoUploadToOSS(request, response, file);
	}

}

该问题已被官方收录

REST接口除了get外，显示405错误

0

1

SSM

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

class="cursor-pointer"> 源码

@Controller
@RequestMapping
public class RestCrud {

    @RequestMapping(value="/postTest",method= RequestMethod.POST)
    public String insert(){
        System.out.println("insert");
        return "success";
    }

    @RequestMapping(value="/deleteTest/{id}",method=RequestMethod.DELETE)
    public String delete(@PathVariable Integer id){
        System.out.println("DELETE"+id);
        return "success";
    }

    @RequestMapping(value="/updateTest/{id}",method=RequestMethod.PUT)
    public String update(@PathVariable Integer id){
        System.out.println("UPDATE"+id);
        return "success";
    }

    @RequestMapping(value="/getTest/{id}")
    public String get(@PathVariable Integer id){
        System.out.println("GET"+id);
        return "success";
    }

    @RequestMapping(value="",method=RequestMethod.GET)
    public String index(){
        return "success";
    }


}
jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>Insert title here</title>
</head>
<body>
success！！

<!-- Rest CRUD -->
<form action="postTest/" method="post">
    <input type="submit" value="post"/>
</form>

<form action="deleteTest/1/" method="post">
    <input type="hidden" name="_method" value="DELETE"/>
    <input type="submit" value="delete"/>
</form>

<form action="updateTest/1/" method="post">
    <input type="hidden" name="_method" value="PUT"></input>
    <input type="submit" value="update"></input>
</form>

<a href="getTest/1">get</a>
</body>
</html>

该问题已被官方收录

Navicat中导出数据库没有字段名

2

1

数据库

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

该问题已被官方收录

rest 风格使用 PUT和 DELETE

1

rest

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

该问题已被官方收录

图片迁移异常

0

1

图片上传

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

class="cursor-pointer"> 源码

public void transferUpload(String fileName,InputStream inputStream) {

        //请求上传凭证
        Auth auth = Auth.create(accessKey, secretKey);
        String upToken = auth.uploadToken(bucket);
        try {

            Response response = uploadManager.put(inputStream, fileName, upToken,null,null);
            DefaultPutRet putRet = new Gson().fromJson(response.bodyString(), DefaultPutRet.class);
            System.out.println(putRet.key);
            System.out.println(putRet.hash);
        } catch (QiniuException ex) {
            Response r = ex.response;
            System.err.println(r.toString());
            try {
                System.err.println(r.bodyString());
            } catch (QiniuException ex2) {
            }
        }
    }
public void transferUpload(InputStream inputStream,String fileName){
        ObjectMetadata objectMetadata = new ObjectMetadata();
        objectMetadata.setContentLength(1);
        cosClient.putObject(bucketName,fileName,inputStream,objectMetadata);
    }

com.qcloud.cos.exception.CosClientException: More data read than expected: dataLength=8192; expectedLength=1; includeSkipped=false; in.getClass()=class com.qcloud.cos.internal.ReleasableInputStream; markedSupported=false; marked=0; resetSinceLastMarked=false; markCount=0; resetCount=0

at com.qcloud.cos.internal.LengthCheckInputStream.checkLength(LengthCheckInputStream.java:117)
	at com.qcloud.cos.internal.LengthCheckInputStream.read(LengthCheckInputStream.java:76)
	at com.qcloud.cos.internal.SdkFilterInputStream.read(SdkFilterInputStream.java:47)
	at com.qcloud.cos.internal.MD5DigestCalculatingInputStream.read(MD5DigestCalculatingInputStream.java:82)
	at java.io.BufferedInputStream.fill(BufferedInputStream.java:246)
	at java.io.BufferedInputStream.read1(BufferedInputStream.java:286)
	at java.io.BufferedInputStream.read(BufferedInputStream.java:345)
	at com.qcloud.cos.internal.SdkBufferedInputStream.read(SdkBufferedInputStream.java:46)
	at com.qcloud.cos.internal.SdkFilterInputStream.read(SdkFilterInputStream.java:47)
	at com.qcloud.cos.internal.SdkFilterInputStream.read(SdkFilterInputStream.java:47)
	at com.qcloud.cos.event.ProgressInputStream.read(ProgressInputStream.java:145)
	at org.apache.http.entity.InputStreamEntity.writeTo(InputStreamEntity.java:140)
	at org.apache.http.impl.execchain.RequestEntityProxy.writeTo(RequestEntityProxy.java:121)
	at org.apache.http.impl.DefaultBHttpClientConnection.sendRequestEntity(DefaultBHttpClientConnection.java:156)
	at org.apache.http.impl.conn.CPoolProxy.sendRequestEntity(CPoolProxy.java:160)
	at org.apache.http.protocol.HttpRequestExecutor.doSendRequest(HttpRequestExecutor.java:238)
	at org.apache.http.protocol.HttpRequestExecutor.execute(HttpRequestExecutor.java:123)
	at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:272)
	at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:185)
	at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:89)
	at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:111)
	at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:185)
	at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83)
	at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:56)
	at com.qcloud.cos.http.DefaultCosHttpClient.exeute(DefaultCosHttpClient.java:365)
	at com.qcloud.cos.COSClient.invoke(COSClient.java:500)
	at com.qcloud.cos.COSClient.putObject(COSClient.java:816)
	at com.qcloud.cos.COSClient.putObject(COSClient.java:871)
	at jnshu.api.tencentCloud.Storage.transferUpload(Storage.java:72)
	at jnshu.api.qiNiuCloud.Storage.test(Storage.java:184)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
	at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
	at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
	at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)

Process finished with exit code -1

该问题已被官方收录

为什么输出中文乱码？

1

JDBC

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

class="cursor-pointer"> 源码

package jdbc;

import java.sql.*;

public class Jdbctest {
    private static final String URL = "jdbc:mysql://localhost:3306/lianxi?useUnicode=true&characterEncoding=utf-8&useSSL=true";
    private static final String NAME = "root";
    private static final String PASSWORD = "123456";

    public static void main(String[] args) throws Exception {
        Class.forName("com.mysql.jdbc.Driver");
        Connection conn = DriverManager.getConnection(URL, NAME, PASSWORD);
        Statement stmt = conn.createStatement();
        ResultSet rs = stmt.executeQuery("select name,age from tanghaiqing;");
        while (rs.next()) {
            System.out.println(rs.getString("name") + "" + rs.getInt("age"));
        }
        rs.close();
        stmt.close();
        conn.close();
        System.out.println("测试该类");
    }
}