Web常用工具类总结.doc

表单后台验证; package cn.kgli.utils;import java.util.Enumeration;import java.util.UUID;import javax.servlet.http.HttpServletRequest;import mons.beanutils.BeanUtils;public class WebUtils /把request对象中的请求参数封装到bean中public static T request2Bean(HttpServletRequest request,Class clazz)tryT bean = clazz.newInstance();/username=aa password=bb email=Enumeration e = request.getParameterNames(); while(e.hasMoreElements()String name = (String) e.nextElement(); /username=aaa password=123String value = request.getParameter(name);BeanUtils.setProperty(bean, name, value);return bean;catch (Exception e) throw new RuntimeException(e);public static String makeId()/UUID 128 36位字符return UUID.randomUUID().toString();package cn.itcast.web.formbean;import java.util.HashMap;import java.util.Map;import mons.beanutils.locale.converters.DateLocaleConverter;public class RegisterFormBean private String username;private String password;private String password2;private String email;private String birthday;private Map errors = new HashMap();public Map getErrors() return errors;public void setErrors(Map errors) this.errors = errors;public String getUsername() return username;public void setUsername(String username) this.username = username;public String getPassword() return password;public void setPassword(String password) this.password = password;public String getPassword2() return password2;public void setPassword2(String password2) this.password2 = password2;public String getEmail() return email;public void setEmail(String email) this.email = email;public String getBirthday() return birthday;public void setBirthday(String birthday) this.birthday = birthday;/*private String username; 用户名不能为空，并且要是3-8的字符 abcdABcdprivate String password; 密码不能为空，并且要是3-8的数字private String password2; 两次密码要一致private String email; 可以为空，不为空要是一个合法的邮箱private String birthday; 可以为空，不为空时，要是一个合法的日期 * */public boolean validate()boolean isOk = true;if(this.username=null | this.username.trim().equals() )isOk = false;errors.put(username, 用户名不能为空！);elseif(!this.username.matches(a-zA-Z3,8)isOk = false;errors.put(username, 用户名必须是3-8位的字母！);if(this.password=null | this.password.trim().equals()isOk = false;errors.put(password, 密码不能为空！);elseif(!this.password.matches(d3,8)isOk = false;errors.put(password, 密码必须是3-8位的数字！);/private String password2; 两次密码要一致if(this.password2!=null)if(!this.password2.equals(this.password)isOk = false;errors.put(password2, 两次密码不一致！);/private String email; 可以为空，不为空要是一个合法的邮箱/ flx_if(this.email!=null)if(!this.email.matches(w+w+(.w+)+)isOk = false;errors.put(email, 邮箱不是一个合法邮箱！);/private String birthday; 可以为空，不为空时，要是一个合法的日期if(this.birthday!=null)tryDateLocaleConverter conver = new DateLocaleConverter();conver.convert(this.birthday);catch (Exception e) isOk = false;errors.put(birthday, 生日必须要是一个日期！);return isOk;package cn.itcast.web.controller;import java.io.IOException;import java.lang.reflect.InvocationTargetException;import java.util.Date;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import mons.beanutils.BeanUtils;import mons.beanutils.ConvertUtils;import mons.beanutils.locale.converters.DateLocaleConverter;import cn.itcast.domain.User;import cn.itcast.exception.UserExistException;import cn.itcast.service.BusinessService;import cn.itcast.service.impl.BusinessServiceImpl;import cn.itcast.utils.WebUtils;import cn.itcast.web.formbean.RegisterFormBean;public class RegisterServlet extends HttpServlet public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException RegisterFormBean formbean = WebUtils.request2Bean(request, RegisterFormBean.class);/表单校验if(formbean.validate()=false)request.setAttribute(formbean, formbean);request.getRequestDispatcher(/WEB-INF/jsp/register.jsp).forward(request,response);return;/把表单的数据填充到javabean中User user = new User();try /注册字符串到日期的转换器ConvertUtils.register(new DateLocaleConverter(), Date.class);BeanUtils.copyProperties(user, formbean);user.setId(WebUtils.makeId();BusinessService service = new BusinessServiceImpl();service.registerUser(user);request.setAttribute(message, 注册成功！);request.getRequestDispatcher(/message.jsp).forward(request, response);catch (UserExistException e) formbean.getErrors().put(username, 注册用户已存在！);request.setAttribute(formbean, formbean);request.getRequestDispatcher(/WEB-INF/jsp/register.jsp).forward(request, response); catch (Exception e) e.printStackTrace(); /在后台记录异常request.setAttribute(message, 对不起，注册失败！);request.getRequestDispatcher(/message.jsp).forward(request, response);public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException doGet(request, response);过滤器解决中文乱码package cn.itcast.web.filter;import java.io.IOException;import java.io.UnsupportedEncodingException;import javax.servlet.Filter;import javax.servlet.FilterChain;import javax.servlet.FilterConfig;import javax.servlet.ServletException;import javax.servlet.ServletRequest;import javax.servlet.ServletResponse;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletRequestWrapper;import javax.servlet.http.HttpServletResponse;public class CharacterEncodingFilter implements Filter public void doFilter(ServletRequest req, ServletResponse resp,FilterChain chain) throws IOException, ServletException HttpServletRequest request = (HttpServletRequest) req;HttpServletResponse response = (HttpServletResponse) resp;request.setCharacterEncoding(UTF-8);response.setCharacterEncoding(UTF-8);response.setContentType(text/html;charset=UTF-8);chain.doFilter(new MyRequest(request), response);public void init(FilterConfig filterConfig) throws ServletException / TODO Auto-generated method stubpublic void destroy() / TODO Auto-generated method stubclass MyRequest extends HttpServletRequestWrapperprivate HttpServletRequest request;public MyRequest(HttpServletRequest request) super(request);this.request = request;Overridepublic String getParameter(String name) String value = this.request.getParameter(name);if(value=null)return null;if(!this.request.getMethod().equalsIgnoreCase(get)return value;try value = new String(value.getBytes(iso8859-1),UTF-8); catch (UnsupportedEncodingException e) throw new RuntimeException(e);return value;分页前端 显示所有书籍 图书信息 图书名称 作者 价格 图片 描述 操作 $ $book.author $book.price 查看图片 $book.description 修改 删除 当前第$page.pagenum 页     $pagenum     总共$page.totalpage 页，总$page.totalrecord 纪录 封装页面数据：package cn.itcast.domain;import java.util.List;public class Page private int totalpage; /记住总页数private int pagesize = 3; /页面大小private int totalrecord; /总记录数private int pagenum; /记住当前页private int startindex; /记住用户想看的页的数据从哪个地方开始取private List list; /记住页面数据private int startPage;private int endPage;public Page(int pagenum,int totalrecord)this.pagenum = pagenum;this.totalrecord = totalrecord;/算出总页数this.totalpage = (this.totalrecord+this.pagesize-1)/this.pagesize;/算出用户想看的页的数据从数据库哪个地方开始取this.startindex = (this.pagenum-1)*this.pagesize;if(this.totalpage=10)this.startPage = 1;this.endPage = this.totalpage;elsethis.startPage = pagenum-4;this.endPage = pagenum+5;if(this.startPagethis.totalpage)this.endPage = this.totalpage;this.startPage = this.totalpage-9;public int getTotalpage() return totalpage;public void setTotalpage(int totalpage) this.totalpage = totalpage;public int getPagesize() return pagesize;public void setPagesize(int pagesize) this.pagesize = pagesize;public int getTotalrecord() return totalrecord;public void setTotalrecord(int totalrecord) this.totalrecord = totalrecord;public int getPagenum() return pagenum;public void setPagenum(int pagenum) this.pagenum = pagenum;public int getStartindex() return startindex;public void setStartindex(int startindex) this.startindex = startindex;public List getList() return list;public void setList(List list) this.list = list;public int getStartPage() return startPage;public void setStartPage(int startPage) this.startPage = startPage;public int getEndPage() return endPage;public void setEndPage(int endPage) this.endPage = endPage;BookServlet.javapackage cn.itcast.web.manager;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.util.List;import java.util.UUID;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import mons.beanutils.BeanUtils;import mons.fileupload.FileItem;import mons.fileupload.disk.DiskFileItemFactory;import mons.fileupload.servlet.ServletFileUpload;import cn.itcast.domain.Book;import cn.itcast.domain.Page;import cn.itcast.service.BusinessService;import cn.itcast.service.impl.BusinessServiceImpl;import cn.itcast.utils.WebUtils;public class BookServlet extends HttpServlet public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException String method = request.getParameter(method);if(method.equals(addUI)addUI(request,response);if(method.equalsIgnoreCase(add)add(request,response); /派发请求if(method.equalsIgnoreCase(list)list(request,response);private void list(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException String pagenum = request.getParameter(pagenum);BusinessServiceImpl service = new BusinessServiceImpl();Page page = service.getBookPageData(pagenum);request.setAttribute(page, page);request.getRequestDispatcher(/manager/listbook.jsp).forward(request, response);private void add(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException tryBook book = doupload(request);BusinessServiceImpl service = new BusinessServiceImpl();book.setId(WebUtils.makeID();service.addBook(book);request.setAttribute(message, 添加成功！);catch (Exception e) e.printStackTrace();request.setAttribute(message, 添加失败！);request.getRequestDispatcher(/message.jsp).forward(request, response);private Book doupload(HttpServletRequest request)/把上传的图片保存到images目录中，并把request中的请求参数封装到book中Book book = new Book();tryDiskFileItemFactory factory = new DiskFileItemFactory();ServletFileUpload upload = new ServletFileUpload(factory);List list = upload.parseRequest(request);for(FileItem item : list)if(item.isFormField()String name = item.getFieldName();String val