常用的一些工具类--个人学习总结002

public class Result extends HashMap {

    
    public static Result success() {
        Result result = new Result();
        result.put(Constant.RESULT_CODE,Constant.RESULT_SUCCESS);
        return result;
    }


    
    public static Result fail(String message) {
      // 单例模式
        Result result = new Result();
        result.put(Constant.RESULT_CODE,Constant.RESULT_FAIL);
        result.put(Constant.RESULT_MESSAGE,message);
        return result;
    }

}

public class UUIDUtils {
    public static void main(String[] args) {
       String str=UUID.randomUUID().toString();
        str=str.replaceAll("-","");
        System.out.println(str);
    }

    public static String getUUID(){
        return UUID.randomUUID().toString().replaceAll("-","");
    }
}

public class MD5Util {
	
	public static String getMD5(String password) {
		try {
			// 得到一个信息摘要器
			MessageDigest digest = MessageDigest.getInstance("md5");
			byte[] result = digest.digest(password.getBytes());
			StringBuffer buffer = new StringBuffer();
			// 把每一个byte 做一个与运算 0xff;
			for (byte b : result) {
				// 与运算
				int number = b & 0xff;// 加盐
				String str = Integer.toHexString(number);
				if (str.length() == 1) {
					buffer.append("0");
				}
				buffer.append(str);
			}

			// 标准的md5加密后的结果
			return buffer.toString();
		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
			return "";
		}
	}
	
}

public class PageBean {
    private Integer pageNo;  //第几页
    private Integer pageSize; //每页条数
    private List dataList; //数据条
    private Integer totalPage; //总共几页
    private Integer total; //总的条数

    public PageBean(Integer pageNo, Integer pageSize) {
        if(pageNo<=0){
            this.pageNo = 1;
        }else{
            this.pageNo = pageNo;
        }
        if(pageSize<=0){
            this.pageSize = 10;
        }else{
            this.pageSize = pageSize;
        }
        this.pageNo = pageNo;
        this.pageSize = pageSize;
    }

    public Integer getPageNo() {
        return pageNo;
    }

    public void setPageNo(Integer pageNo) {
        this.pageNo = pageNo;
    }

    public Integer getPageSize() {
        return pageSize;
    }

    public void setPageSize(Integer pageSize) {
        this.pageSize = pageSize;
    }

    public List getDataList() {
        return dataList;
    }

    public void setDataList(List dataList) {
        this.dataList = dataList;
    }

    public Integer getTotalPage() {
        return totalPage;
    }

    public void setTotalPage(Integer totalPage) {
        this.totalPage = totalPage;
    }

    public Integer getTotal() {
        return total;
    }

    public void setTotal(Integer total) {
        this.totalPage = (total%pageSize==0)?(total/pageSize):(total/pageSize+1);
        this.total = total;
    }

    
    public Integer getStartIndex(){
        return (this.pageNo-1)*this.pageSize;
    }


    @Override
    public String toString() {
        return "PageBean{" +
                "pageno=" + pageNo +
                ", pagesize=" + pageSize +
                ", dataList=" + dataList +
                ", totalPage=" + totalPage +
                ", total=" + total +
                '}';
    }
}

这里需要提供模糊查询总数的sql和模糊查询
在控制器里传入起始页和每页大小
分页controller

@RequestMapping("/workbench/activity/queryActivityListForPageByCondition.do")
    public @ResponseBody
    Object queryActivityListForPageByCondition(@RequestParam(value = "pageNo", defaultValue = "1", required = true) Integer pageNo,
                                               @RequestParam(value = "pageSize", defaultValue = "5", required = true) Integer pageSize,
                                               @RequestParam(value = "name", required = false) String name,
                                               @RequestParam(value = "ownerName", required = false) String ownerName,
                                               @RequestParam(value = "startDate", required = false) String startDate,
                                               @RequestParam(value = "endDate", required = false) String endDate) {

        //准备参数
        Map param = new HashMap<>();
        param.put("pageNo", pageNo);
        param.put("pageSize", pageSize);
        param.put("name", name);
        param.put("ownerName", ownerName);
        param.put("startDate", startDate);
        param.put("endDate", endDate);

        //调用业务接口层的方法
        //多条件分页查询市场活动列表数据 -> 返回‘分页模型对象’：每页展示数据集合，总记录数
        //按照面向对象编辑思想，将分页查询的数据封装到一个分页模型对象中
        PageBean pageBean = activityService.queryActivityListForPageByCondition(param);

        return pageBean;
    }

分页serviceImpl

 public PageBean queryActivityListForPageByCondition(Map param) {
        PageBean pageBean = new PageBean<>((Integer) param.get("pageNo"), (Integer) param.get("pageSize"));
        Integer offset = pageBean.getStartIndex();
        param.put("offset", offset);//起始行
        //1.获取每页显示的数据集合
        List activityList = activityMapper.selectActivityListForPageByCondition(param);
        pageBean.setDataList(activityList);//当前行的数据
        //2.获取总记录数
        Integer total = activityMapper.selectTotal(param);
        pageBean.setTotal(total);//总行数和总页数
        return pageBean;
    }

如果使用pageHelper则不需要提供计算总记录数的sql，也不需要上面的，直接用即可，非常方便。但是具体属性名称得按照pagehelper里面的属性，然后提供给前端界面进行展示即可。

mail工具类
mail

public class Mail {
    private MailSender mailSender;

    public MailSender getMailSender() {
        return mailSender;
    }

    public void setMailSender(MailSender mailSender) {
        this.mailSender = mailSender;
    }

    public Date sendMail() throws MessagingException {
        Session session=Session.getInstance(mailSender.getProperties());
        MimeMessage message=null;
        Transport transport=null;
        try{
            message=new MimeMessage(session);
            // Set From: 头部头字段
            message.setFrom(new InternetAddress(mailSender.getSenderName()));
            // Set To: 头部头字段
            message.addRecipient(Message.RecipientType.TO,
                    new InternetAddress(mailSender.getRecipientAddress()));
            // Set Subject: 头部头字段
            message.setSubject(mailSender.getSubject());
            // 设置消息体
            // message.setText("来自赵老六的测试邮件");
            message.setContent(mailSender.getContent(),
                    "text/html;charset=gb2312");
            message.saveChanges(); // implicit with send()
            message.setSentDate(new Date());
            session.setDebug(true);
            // Transport transport = session.getTransport("smtp");
            transport = session.getTransport();
            transport.connect(mailSender.getMailServerHost(),mailSender.getMailServerPort(),mailSender.getSenderName(),mailSender.getSenderPassword());
            //发送
            SimpleDateFormat simpleDateFormat=new SimpleDateFormat("yyyy/MM/dd HH:mm:ss.SSS");

            transport.sendMessage(message,message.getAllRecipients());
            transport.close();
            // 发送消息
            //Transport.send(message);
        }catch (MessagingException mex) {
            mex.printStackTrace();
        }
        return message.getSentDate();
    }
}

mailSender

public class MailSender {
    private String senderName;//发件人姓名
    private String senderPassword;//发件人密码
    private String recipientAddress;//收件人地址
    private int  mailServerPort=25;//邮件服务端口
    private String mailServerHost;//邮件服务主机
    private Properties properties=System.getProperties();
    private String subject;//邮件头部
    private String text;//邮件文本
    private String content;//邮件内容

    public String getSenderName() {
        return senderName;
    }

    public void setSenderName(String senderName) {
        this.senderName = senderName;
    }

    public String getSenderPassword() {
        return senderPassword;
    }

    public void setSenderPassword(String senderPassword) {
        this.senderPassword = senderPassword;
    }

    public String getRecipientAddress() {
        return recipientAddress;
    }

    public void setRecipientAddress(String recipientAddress) {
        this.recipientAddress = recipientAddress;
    }

    public int getMailServerPort() {
        return mailServerPort;
    }

    public void setMailServerPort(int mailServerPort) {
        this.mailServerPort = mailServerPort;
    }

    public String getMailServerHost() {
        return mailServerHost;
    }

    public void setMailServerHost(String mailServerHost) {
        this.mailServerHost = mailServerHost;
    }

    public Properties getProperties() {
        properties.setProperty("mail.smtp.auth", "true");
        //设置认证协议
        properties.setProperty("mail.transport.protocol","smtp");
        return properties;
    }

    public String getSubject() {
        return subject;
    }

    public void setSubject(String subject) {
        this.subject = subject;
    }

    public String getText() {
        return text;
    }

    public void setText(String text) {
        this.text = text;
    }

    public String getContent() {
        return content;
    }

    public void setContent(String content) {
        this.content = content;
    }
}

controller

  
    @RequestMapping("/sendCode")
    @ResponseBody
    public Object sendCode(HttpServletRequest request, HttpSession session) throws Exception {
        if (true) {
            MailSender mailSender = new MailSender();
            mailSender.setSenderName("******@qq.com");
            mailSender.setSenderPassword("********");
            String email = request.getParameter("email");
            if (email != null ) {
                mailSender.setRecipientAddress(email);
            }
            mailSender.setMailServerHost("smtp.qq.com");
            mailSender.setSubject("修改密码验证！");
            String result = "";
            for (int i = 0; i < 6; i++) {
                int intVal = (int) (Math.random() * 26 + 97);
                result = result + (char) intVal;
            }
            String content = "您的验证码为：" + result;
            mailSender.setContent(content);
            Mail mail = new Mail();
            mail.setMailSender(mailSender);
            //返回邮件发送时间
            Date mailSentDate = mail.sendMail();
            session.setAttribute("code", result);
            ajaxResult.ajaxTrue("验证码发送成功,请去修改密码");
        } else {
            ajaxResult.ajaxFalse("验证码发送失败");
        }

        return ajaxResult;
    }