【Java】党员系统怎么写，java小哥来教你

• Z时代
• 2024-01-10
• 分类：技术分享

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项目介绍

项目适用人群

正在做毕设的学生，或者需要项目实战练习的Java学习者

开发环境：

1. jdk 8
2. intellij idea
3. tomcat 8.5.40
4. mysql 5.7

所用技术：

1. jsp+servlet
2. js+ajax
3. layUi
4. jdbc直连

项目访问地址

http://localhost:8090

项目结构

项目截图

• 注册

• 系统管理

• 新增/修改用户

• 正式党员信息

• 公告管理

• 文件管理

关键代码:

1.初始化工作

//数据库连接初始化
public Connection getConnection() {
Connection conn = null;
String sDBDriver = "com.mysql.jdbc.Driver";
String url = "jdbc:mysql://localhost:3306/schooldb?useUnicode=true&characterEncoding=utf8";
try {
//加载数据库驱动
Class.forName(sDBDriver);
//获取数据库链接 -账号-密码
conn = DriverManager.getConnection(url, "root", "root123");
return conn;
} catch (Exception e) {
e.printStackTrace();
System.err.println("数据库驱动注册错误信息： " + e.getMessage());
}
return conn;
}

2.党费信息Servlet

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
try {
String mtype = request.getParameter("mtype");
String url = "";
DangfeiDao dangfeiDao = new DangfeiDao();
/**
* 添加党费信息
*/
if ("add".equals(mtype)) {
TDangfei dangfei = new TDangfei();
dangfei.setTypeid(request.getParameter("typeid"));
dangfei.setClassname(request.getParameter("classname"));
dangfei.setDangfei(request.getParameter("dangfei"));
dangfei.setDangtype(request.getParameter("dangtype"));
dangfei.setShouyear(request.getParameter("shouyear"));
dangfei.setTypename(request.getParameter("typename"));
dangfei.setUsername(request.getParameter("username"));
dangfeiDao.addDangfei(dangfei);
url = "/DangfeiServlet?mtype=query&flag=success";
/**
* 初始化修改党费信息界面
*/
} else if ("preupdate".equals(mtype)) {
request.setAttribute("dangfei", dangfeiDao.getDangfei(request.getParameter("id")));
url = "/files/dangfei/update.jsp";
/**
* 修改党费信息
*/
} else if ("update".equals(mtype)) {
TDangfei dangfei = new TDangfei();
dangfei.setId(Integer.parseInt(request.getParameter("id")));
dangfei.setTypeid(request.getParameter("typeid"));
dangfei.setClassname(request.getParameter("classname"));
dangfei.setDangfei(request.getParameter("dangfei"));
dangfei.setDangtype(request.getParameter("dangtype"));
dangfei.setShouyear(request.getParameter("shouyear"));
dangfei.setTypename(request.getParameter("typename"));
dangfei.setUsername(request.getParameter("username"));
dangfeiDao.updateDangfei(dangfei);
url = "/DangfeiServlet?mtype=query";
/**
* 遍历党费信息
*/
} else if ("query".equals(mtype)) {
if (request.getSession().getAttribute("querypageunit") == null) {
request.getSession().setAttribute("querypageunit",
this.pageunit);
}
int curpage = this.getCurrentpage(request);
int pageunit = this.getPageunit(request, "querypageunit");
String urlpage = "DangfeiServlet?mtype=query";
StringBuffer cond = new StringBuffer();
if (null != request.getParameter("searchname") && "" != request.getParameter("searchname").trim()) {
cond.append(" and a.typename like '%" + request.getParameter("searchname").trim() + "%' ");
}
if (null != request.getSession().getAttribute("usertype") && !"0".equals(((String) request.getSession().getAttribute("usertype")))) {
cond.append(" and a.typeid like '%" + (String) request.getSession().getAttribute("typeid") + "%' ");
}
PageInfo pageInfo = dangfeiDao.queryTDangfei(curpage,
pageunit, request, urlpage, cond.toString());
request.setAttribute("pageinfo", pageInfo);
request.setAttribute("searchname", request.getParameter("searchname"));
url = "/files/dangfei/list.jsp";
/**
* 删除党费信息
*/
} else if ("delete".equals(mtype)) {
dangfeiDao.delDangfei(request.getParameter("id"));
url = "/DangfeiServlet?mtype=query";
}
//重定向到目标地址
RequestDispatcher dispatcher = request.getRequestDispatcher(url);
dispatcher.forward(request, response);
} catch (Exception e) {
e.printStackTrace();
}
}

3.文件下载

public void doGet(HttpServletRequest request, HttpServletResponse response)throws  IOException {
//获得请求文件名
request.setCharacterEncoding("ISO-8859-1");
String filename = request.getParameter("filename");
filename = new String(filename.getBytes("ISO-8859-1"), "UTF-8");
//设置文件MIME类型
response.setContentType(getServletContext().getMimeType(filename));
//设置Content-Disposition
response.setHeader("Content-Disposition", "attachment;filename=" + new String(filename.getBytes("GBK"), "ISO-8859-1"));
//读取目标文件，通过response将目标文件写到客户端
//获取目标文件的绝对路径
String fullFileName = getServletContext().getRealPath("/upload/" + filename);
//读取文件
InputStream in = new FileInputStream(fullFileName);
OutputStream out = response.getOutputStream();
//写文件
int b;
while ((b = in.read()) != -1) {
out.write(b);
}
in.close();
out.close();
}

项目后续

其他ssh，ssm，springboot版本后续迭代更新，持续关注

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