自己写的标题截取长度加“...”显示标签

网络上的提供的大多数截取长度的方法放到jsp页面中总是感觉比较繁琐，参考网友的代码，自己写了一个标签，大家可以参考一下

 

 

package com.abc.zj.framework.tag;

import java.io.IOException;
import java.text.MessageFormat;
import java.util.HashMap;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.TagSupport;

import com.abc.zj.framework.action.BaseResultModel;

public class SubString extends TagSupport
{
 private String value;
 private int len;
 private String suffix;
 
    public int getLen() {
  return len;
 }

 public void setLen(int len) {
  this.len = len;
 }

 public String getValue() {
  return value;
 }

 public String getSuffix() {
  return suffix;
 }

 public void setSuffix(String suffix) {
  this.suffix = suffix;
 }

 public void setValue(String value) {
  this.value = value;
 }

 public SubString()
    {
  value="";
  len=0;
  suffix= "";
    }

    public int doStartTag()
        throws JspException
    {
        return 0;
    }

    public int doEndTag()
        throws JspException
    {
        JspWriter out = super.pageContext.getOut();
        try
        {
         String temp = getLimitStr(value, len);
         if(value.equals(temp)){
          out.print(temp);
         }else{
          out.print(temp+suffix);
         }
        }
        catch(IOException e)
        {
            throw new JspException(e.getMessage());
        }
        catch(Exception e)
        {
            throw new JspException(e.getMessage());
        }
        return 6;
    }

 /**
  * 编写一个截取字符串的函数，输入为一个字符串和字节数，输出为按字节截取的字符串。 但是要保证汉字不被截半个，如“我ABC”4，应该截为“我AB”，
  * 输入“我ABC汉DEF”，6，应该输出为“我ABC”而不是“我ABC+汉的半个”。
  *
  * @param args
  */

 public static void main(String args[]) {
  String s = "一般收文单独:手工登记状态测试111111";
  int len = 40;
//  SplitStr(s, len);
  System.out.print(getLimitStr(s,len));
 }

 public static String getLimitStr2(String str, int len) {

  String result = "";
  char temp;
  // 取得的字节数
  int counter = 0;
  int i = 0;
  // 汉字个数
  int han = 0;

 

int strLen = str.getBytes().length;
  if(strLen<len){
   len = strLen;
  }
  while (counter < len) {
   temp = str.charAt(i);
   System.out.println(i);
   if (Character.getNumericValue(temp) != -1) {
    // 遇到字母的时候
    result = result + temp;
    counter++;
    i++;

   } else {
    // 遇到汉字的时候，作为unicode字符，汉字的整数值是-1
    result = result + temp;
    counter = counter + 2;
    i++;
    han = han + 1;
   }
  }

  if (counter > len) {
   if (len == 1) {
    result = "";
   } else {
    result = result.substring(0, counter - (han + 1));
   }
  }
  return result;
  //System.out.println("result       " + result);
 }
 
 
 public static String getLimitStr( String str,int len){
        try{
            if(str==null)     return"";        
            int counterOfDoubleByte = 0;
            byte[] b = str.getBytes("GBK");
           
            if(b.length <= len)
               return str;
           
            for(int i = 0; i < len; i++){          
                if(b[i] < 0)
                 counterOfDoubleByte++;
           }   
            if(counterOfDoubleByte % 2 == 0)
               return new String(b, 0, len, "GBK");
            else
               return new String(b, 0, len - 1, "GBK");
         }catch(Exception ex){      
        return"";
        }
    }
}

 

 

abc.tld

 

 

<?xml version="1.0" encoding="utf-8" ?>

<!DOCTYPE taglib PUBLIC
    "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.2//EN"
    "http://java.sun.com/dtds/web-jsptaglibrary_1_2.dtd" >

<taglib>
 <tlib-version>1.0</tlib-version>
 <jsp-version>1.2</jsp-version>
 <short-name>abc Tags</short-name>
 <description>
  Tag Library of abc Web Application Framework
 </description>

 <tag>
  <name>page</name>
  <tag-class>com.abc.zj.framework.tag.Page</tag-class>
  <description>
   Render page navigation bar in jsp file.
  </description>
  <attribute>
   <name>formName</name>
   <required>false</required>
   <rtexprvalue>false</rtexprvalue>
  </attribute>
  <attribute>
   <name>className</name>
   <required>true</required>
   <rtexprvalue>true</rtexprvalue>
  </attribute>
  <attribute>
   <name>noForm</name>
   <required>true</required>
   <rtexprvalue>true</rtexprvalue>
   <type>java.lang.Boolean</type>
  </attribute>
 </tag>
  <tag>
  <name>subString</name>
  <tag-class>com.abc.zj.framework.tag.SubString</tag-class>
  <description>
   SubString for like abcdefg...
  </description>
  <attribute>
   <name>value</name>
   <required>true</required>
   <rtexprvalue>true</rtexprvalue>
  </attribute>
  <attribute>
   <name>len</name>
   <required>false</required>
   <rtexprvalue>true</rtexprvalue>
   <type>java.lang.Integer</type>
  </attribute>
  <attribute>
   <name>suffix</name>
   <required>false</required>
   <rtexprvalue>true</rtexprvalue>
  </attribute>
 </tag>
</taglib>

代码就那么多，考回去改成自己想要的名字就可以用