taglib--文本切割
返回 常用taglib及用法>>
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1. tld文件配置
package com.neu.edu.utils.mytaglib;import java.io.IOException;import java.util.HashMap;import java.util.Map;import javax.servlet.jsp.JspException;import javax.servlet.jsp.JspWriter;import javax.servlet.jsp.tagext.BodyContent;import javax.servlet.jsp.tagext.BodyTagSupport;import javax.servlet.jsp.tagext.JspFragment;import javax.servlet.jsp.tagext.SimpleTagSupport;import org.apache.commons.codec.EncoderException;import org.apache.commons.codec.net.URLCodec;import org.apache.commons.lang.StringUtils;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;import com.xiaonei.wap.framework.util.WapStringUtils;public class StringCutTag extends BodyTagSupport { private int length = 0; private String str = ""; public void setLength(int length) { this.length = length; } public void setStr(String str) { this.str = str; } @Override public int doAfterBody() throws JspException { BodyContent bodyContent = getBodyContent(); String content = bodyContent.getString(); String outStr = cut(content, length); JspWriter out = bodyContent.getEnclosingWriter(); try { out.write(outStr); } catch (IOException e) { e.printStackTrace(); } return super.doAfterBody(); } @Override public int doStartTag() throws JspException { if(StringUtils.isNotBlank(str)){ String outStr = cut(str, length); try { pageContext.getOut().print(outStr); } catch (IOException e) { e.printStackTrace(); } return SKIP_BODY; } else return super.doStartTag(); } private String cut(String str, int length) { if (StringUtils.isBlank(str) || length <= 0) return ""; if (str.length() <= length) return str; int tlength = 0; int maxLength = length * 2; int i; for (i = 0; i < str.length() && tlength <= maxLength; i++) { if (CharUtils.isAscii(str.charAt(i))) ++tlength; else tlength += 2; } if (i == str.length() && tlength <= maxLength) return str; maxLength -= 2; while (tlength > maxLength) { if (CharUtils.isAscii(str.charAt(i - 1))) --tlength; else tlength -= 2; --i; } return str.substring(0, i) + "..."; }}?3. 使用
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??? <renren-wap:stringCut length="28">${content}</renren-wap:stringCut>
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