In Struts1.x, garbled characters are processed and data is displayed through tags.

In Struts1.x, garbled characters are processed and data is displayed through tags.

1. Solve garbled characters through filter

Before a webpage request arrives, it must be filtered;

Request. setCharacterEncoding ("UTF-8 ");

Response Data garbled: response. setCharacterEncoding ("UTF-8 ");

Create a filter in Eclipse in two ways: annotation and xml

1) create a Filter Using Annotations:

Right-click a new filter, name it EncodingFilter, and click next. As shown in, configure the url /*

Click finish.

The Code is as follows:

 1 package util; 2  3 import java.io.IOException; 4 import javax.servlet.DispatcherType; 5 import javax.servlet.Filter; 6 import javax.servlet.FilterChain; 7 import javax.servlet.FilterConfig; 8 import javax.servlet.ServletException; 9 import javax.servlet.ServletRequest;10 import javax.servlet.ServletResponse;11 import javax.servlet.annotation.WebFilter;12 13 @WebFilter(dispatcherTypes = {14                 DispatcherType.REQUEST, 15                 DispatcherType.FORWARD, 16                 DispatcherType.INCLUDE, 17                 DispatcherType.ERROR18         }19                     , urlPatterns = { "/*" })20 public class EncodingFilter implements Filter {21 22     public void destroy() {}23 24     public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {25         request.setCharacterEncoding("UTF-8");26         response.setCharacterEncoding("UTF-8");27         chain.doFilter(request, response);28     }29 30     public void init(FilterConfig fConfig) throws ServletException {}31 32 }

2) xml configuration
Java code:

 1 package util; 2  3 import java.io.IOException; 4  5 import javax.servlet.Filter; 6 import javax.servlet.FilterChain; 7 import javax.servlet.FilterConfig; 8 import javax.servlet.ServletException; 9 import javax.servlet.ServletRequest;10 import javax.servlet.ServletResponse;11 12 public class EncodingFilter implements Filter {13 14     public void destroy() {}15 16     public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {17         request.setCharacterEncoding("UTF-8");18         response.setCharacterEncoding("UTF-8");19         chain.doFilter(request, response);20     }21 22     public void init(FilterConfig fConfig) throws ServletException {}23 24 }

Configuration in web. xml

1   <filter>2       <filter-name>EncodingFilter</filter-name>3       <filter-class>util.EncodingFilter</filter-class>4   </filter>5   <filter-mapping>6       <filter-name>EncodingFilter</filter-name>7       <url-pattern>/*</url-pattern>8   </filter-mapping>

OK.

2. display data by TAG (example: show all users in userlist. jsp)

Write DAO code first

1/** 2 * Get information of all users 3 * @ return all users 4 */5 public ArrayList <User> getUsers () {6 ArrayList <User> users = new ArrayList <User> (); 7 String SQL = "select id, username, pwd from users"; 8 Connection conn = DBLib. getConn (); 9 try {10 PreparedStatement pstmt = conn. prepareStatement (SQL); 11 ResultSet set = pstmt.exe cuteQuery (); 12 while (set. next () {13 User user = new User (); 14 user. setId (set. getInt ("id"); 15 user. setUserName (set. getString ("username"); 16 user. setPwd (set. getString ("pwd"); 17 users. add (user); 18} 19 set. close (); 20 pstmt. close (); 21} catch (SQLException e) {22 e. printStackTrace (); 23} finally {24 try {25 conn. close (); 26} catch (SQLException e) {27 e. printStackTrace (); 28} 29} 30 return users; 31}

The page uses the struts tag for iterative output:

1 <% @ page language = "java" contentType = "text/html; charset = UTF-8" 2 pageEncoding = "UTF-8" import = "dao. * "%> 3 <% @ taglib uri =" http://struts.apache.org/tags-logic "prefix =" logic "%> 4 <% @ taglib uri =" http://struts.apache.org/tags-bean "prefix =" bean "%> 5 <! DOCTYPE html PUBLIC "-// W3C // dtd html 4.01 Transitional // EN" http://www.w3.org/TR/html4/loose.dtd "> 6 
Logic labels are used for iteration, and bean labels are printed. I am not familiar with many labels, but I don't know much about it. Because there are a lot of labels, I need to ask the teacher or the old teacher again.
There is a reference link below: http://www.cnblogs.com/go-onxp/archive/2012/09/18/2690157.html
Bean: used to create bean, access bean, and access bean attributes;
Html: used to create a Struts input form;
Logic: used for logical judgment, set iteration, and process control;
Nested: Based on the first three tag libraries, with all the functions of the first three tag libraries, only allows nesting between tags;
Tiles: The page used to create the tiles style.
Generally, bean and logic are enough.
Code link: http://pan.baidu.com/s/1miTuwze extract code: kpa5