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用过滤器解决MVC添加书本信息时的乱码问题
一：View addBook.jsp
1 <%@page language="java" contentType="text/html; charset=utf-8" 2 pageEncoding="utf-8" import="java.util.*" import="nuc.sw.EL.bean.EL"%> 3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 4 <html> 5 <head> 6 <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> 7 <title>Insert title here</title> 8 </head> 9 <body>10 <form action="ELServlet" method="post">11 <table align="left" >12 <tr>13 <td>书名:</td>14 <td><input type="text" name="bookName"></td>15 </tr>16 <tr>17 <td>作者:</td>18 <td><input type="text" name="authorName"></td>19 </tr>20 <tr>21 <td>定价:</td>22 <td><input type="text" name="bookPrice"></td>23 </tr>24 <tr>25 <td><input type="submit" value="添加"></td>26 </tr>27 </table>28 </form>29 </body>30 </html>
二：Model nuc.sw.EL.bean EL.java
1 package nuc.sw.EL.bean; 2 3 public class EL { 4 private String bookName; 5 private String authorName; 6 private float bookPrice; 7 public String getBookName() { 8 return bookName; 9 }10 public void setBookName(String bookName) {11 this.bookName = bookName;12 }13 public String getAuthorName() {14 return authorName;15 }16 public void setAuthorName(String authorName) {17 this.authorName = authorName;18 }19 public Float getBookPrice() {20 return bookPrice;21 }22 public void setBookPrice(Float bookPrice) {23 this.bookPrice = bookPrice;24 }25 26 }
三：Control nuc.sw.EL.servlet ELServlet.java
1 package nuc.sw.EL.servlet; 2 3 import java.io.IOException; 4 import java.util.ArrayList; 5 import java.util.List; 6 7 import javax.servlet.ServletException; 8 import javax.servlet.http.HttpServlet; 9 import javax.servlet.http.HttpServletRequest;10 import javax.servlet.http.HttpServletResponse;11 12 import nuc.sw.EL.bean.EL;13 14 /**15 * Servlet implementation class ELServlet16 */17 public class ELServlet extends HttpServlet {18 private static final long serialVersionUID = 1L;19 20 /**21 * @see HttpServlet#HttpServlet()22 */23 public ELServlet() {24 super();25 // TODO Auto-generated constructor stub26 }27 28 /**29 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)30 */31 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {32 // TODO Auto-generated method stub33 response.getWriter().append("Served at: ").append(request.getContextPath());34 }35 36 /**37 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)38 */39 protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {40 // TODO Auto-generated method stub41 //doGet(request, response);42 EL el=new EL();43 el.setBookName(request.getParameter("bookName"));44 el.setAuthorName(request.getParameter("authorName"));45 el.setBookPrice(Float.parseFloat(request.getParameter("bookPrice")));46 //request.setAttribute("el", el);47 List<EL> list;48 if(request.getSession().getAttribute("booklist")==null){49 list= new ArrayList<EL>();50 list.add(el);51 }52 else{53 list=(ArrayList<EL>)request.getSession().getAttribute("booklist");54 list.add(el);55 }56 57 request.getSession().setAttribute("booklist", list);58 request.getRequestDispatcher("showBookInfo.jsp").forward(request, response);59 //request.getRequestDispatcher("addBook.jsp").forward(request, response);60 }61 62 }
四：显示书本信息 showBookInfo.jsp
1 <%@page language="java" contentType="text/html; charset=utf-8" 2 pageEncoding="utf-8" import="java.util.*,nuc.sw.EL.bean.EL"%> 3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 4 <html> 5 <head> 6 <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> 7 <title>Insert title here</title> 8 </head> 9 <body>10 <table align="right" border="1">11 <caption>全部书籍信息</caption>12 <tr>13 <td>书名:</td>14 <td>作者:</td>15 <td>定价:</td>16 </tr>17 <% 18 Iterator<EL> iter=((ArrayList<EL>)session.getAttribute("booklist")).iterator(); 19 while(iter.hasNext()){20 pageContext.setAttribute("book",iter.next());21 %>22 23 <tr>24 <td>${book.bookName} </td>25 <td>${book.authorName} </td>26 <td>${book.bookPrice} </td>27 </tr> 28 <%29 }30 %>31 32 </table>33 <a href="addBook.jsp">继续添加</a>34 </body>35 </html>
五：设置汉字乱码 nuc.sw.book.filter EncodingFilter.java
1 package nuc.sw.book.filter; 2 3 import java.io.IOException; 4 import javax.servlet.Filter; 5 import javax.servlet.FilterChain; 6 import javax.servlet.FilterConfig; 7 import javax.servlet.ServletException; 8 import javax.servlet.ServletRequest; 9 import javax.servlet.ServletResponse;10 11 /**12 * Servlet Filter implementation class EncodingFilter13 */14 public class EncodingFilter implements Filter {15 16 /**17 * Default constructor. 18 */19 public EncodingFilter() {20 // TODO Auto-generated constructor stub21 }22 23 /**24 * @see Filter#destroy()25 */26 public void destroy() {27 // TODO Auto-generated method stub28 }29 30 /**31 * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)32 */33 public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {34 // TODO Auto-generated method stub35 // place your code here36 37 // pass the request along the filter chain38 request.setCharacterEncoding("utf-8");39 chain.doFilter(request, response);40 }41 42 /**43 * @see Filter#init(FilterConfig)44 */45 public void init(FilterConfig fConfig) throws ServletException {46 // TODO Auto-generated method stub47 }48 49 }
六：运行结果
用过滤器解决MVC添加书本信息时的乱码问题
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